RF-SM-1077B1 Ultra-Low-Power 868 MHz & 915 MHz Wireless … · RF-SM-1077B1 Ultra-Low-Power 868 MHz...
Transcript of RF-SM-1077B1 Ultra-Low-Power 868 MHz & 915 MHz Wireless … · RF-SM-1077B1 Ultra-Low-Power 868 MHz...
RF-SM-1077B1 Ultra-Low-Power 868 MHz &
915 MHz Wireless Module
Version 2.1
Shenzhen RF-star Technology Co., Ltd.
Aug. 02, 2018
RF-SM-1077B1
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1 Device Overview
1.1 Description
RF-SM-1077B1 Sub-1 GHz module is based on TI CC1310, which combines a flexible, very low-power RF transceiver
with a powerful 48 MHz ARM® Cortex®-M3 microcontroller supporting multiple physical layers and RF standards and a
dedicated radio controller Cortex®-M0 handling RF protocol commands that are stored in ROM or RAM. RF-SM-1077B1
integrates a 24.0 MHz crystal, a balun, a band pass filter, an antenna matching and an IPEX antenna matching which
make the module low cost, low power consumption and long wireless communication in Sub-1 GHz.
RF-SM-1077B1 is flashed transparent transmission firmware with AT commands by default. The default values are as
follows: 115200 baud rate, 8 data bit, no parity check bit,1 stop bit, 868 MHz operating frequency, 14 dBm TX power.
When the module starts to work, the serial port will print “Application Start\r\n”, and start transparent transmission mode
by default, serial port will transmit all the data except “+++”, please refer to the AT command in detail.
1.2 Key Features
Microcontroller
- Powerful ARM® Cortex®-M3 processor
- EEMBC CoreMark® Score: 142
- EEMBC ULPBench™ score: 158
- Clock speed up to 48 MHz
- 128 KB of in-system programmable flash
- 8 KB of SRAM for Cache (or as general-purpose
RAM)
- 20 KB of ultra-low-leakage SRAM
- 2-pin cJTAG and JTAG debugging
- Supports over-the-air (OTA) update
On-Chip Internal DC/DC Converter
Ultra-Low-Power Sensor Controller
- Can run autonomously from the rest of the
- System
- 16-bit architecture
- 2 KB of ultra-low-leakage SRAM for code and data
RF-Section
- Excellent receiver sensitivity: –124 dBm @ long-
range mode, –110 dBm @ 50 kbps
- Excellent selectivity (±100 kHz): 56 dB
- Excellent blocking performance (±10 MHz): 90 dB
- Programmable output power up to +14 dBm
- Single-ended or differential RF interface
- Suitable for systems targeting compliance with
worldwide radio frequency regulations
ETSI EN 300 220, EN 303 204 (Europe)
FCC CFR47 Part 15 (US)
ARIB STD-T108 (Japan)
- Wireless M-Bus (EN 13757-4) and IEEE®
802.15.4g PHY
Peripherals
- All digital peripheral pins can be routed to any
GPIO
- Four general-purpose timer modules (eight 16-bit
or four 32-bit timers, PWM each)
- 12-bit ADC, 200 ksamples/s, 8-channel analog
MUX
- Continuous time comparator
- Ultra-low-power clocked comparator
- Programmable current source
- UART
- 2× SSI (SPI, MICROWIRE, TI)
- I2C, I2S
- Real-time clock (RTC)
- AES-128 security module
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- True random number generator (TRNG)
- Support for eight capacitive sensing buttons
- Integrated temperature sensor
Low Power
- Wide supply voltage range: 1.8 V to 3.8 V
- RX: 5.4 mA
- TX at +10 dBm: 13.4 mA
- Active-mode MCU 48 MHz running Coremark: 2.5
mA (51 μA/MHz)
- Active-mode MCU: 48.5 CoreMark/mA
- Active-mode sensor controller at 24 MHz: 0.4 mA
+ 8.2 μA/MHz
- Sensor controller, one wake-up every second
performing one 12-bit ADC sampling: 0.95 μA
- Standby: 0.7 μA (RTC running and RAM and CPU
retention)
- Shutdown: 185 nA (wakeup on external events)
1.3 Applications
868-, 915-MHz ISM and SRD systems
Low-power wireless systems with 50-kHz to 5-MHz
channel spacing
Home and building automation
Wireless alarm and security systems
Industrial Monitoring and Control
Smart grid and automatic meter reading
Wireless healthcare applications
Wireless sensor networks
Active RFID
IEEE 802.15.4g, IP-enabled smart objects
(6LoWPAN), wireless M-Bus, KNX systems,
Wi-SUN™, and proprietary systems
Energy-harvesting applications
Electronic shelf label (ESL)
Long-range sensor applications
Heat-cost allocators
1.4 Functional Block Diagram
Figure 1. Functional Block Diagram of RF-SM-1077B2
CC1310
RGZ
GPIOs
Reset
IPEX Interface
Band Pass Filter
Power Supply
1.8 V ~ 3.8 V
Antenna Matching
24.0 MHz
Balun
32.768 kHz
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1.5 Working Mode
Figure 2. Working Mode of RF-SM-1077B1
1.6 Part Number Conventions
The part numbers are of the form of RF-SM-1077B1 where the fields are defined as follows:
Figure 3. Part Number Conventions of RF-SM-1077B1
RF SM 1077
RF-STAR
Company Name
Sub-1 GHz Module
Wireless Type
Chipset Manufacturer
TI CC1310F128RGZ
- - B1
Module Version
Version Number
RF-SM-1077B1
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Table of Contents
1 Device Overview ............................................................................................................................................................. 1
1.1 Description............................................................................................................................................................ 1
1.2 Key Features ....................................................................................................................................................... 1
1.3 Applications .......................................................................................................................................................... 2
1.4 Functional Block Diagram .............................................................................................................................. 2
1.5 Working Mode ..................................................................................................................................................... 3
1.6 Part Number Conventions .............................................................................................................................. 3
Table of Contents ................................................................................................................................................................ 4
Table of Figures ................................................................................................................................................................... 5
Table of Tables ..................................................................................................................................................................... 6
2 Module Configuration and Functions ...................................................................................................................... 7
2.1 Module Parameters ........................................................................................................................................... 7
2.2 Module Pin Diagram ......................................................................................................................................... 8
2.3 Pin Functions ....................................................................................................................................................... 8
3 Specifications ................................................................................................................................................................. 10
3.1 Recommended Operating Conditions ..................................................................................................... 10
3.2 Handling Ratings .............................................................................................................................................. 10
3.3 Power Consumption ....................................................................................................................................... 10
3.3.1 Current Consumption ........................................................................................................................ 10
3.3.2 Power Consumption Test ................................................................................................................. 12
4 Functions ......................................................................................................................................................................... 12
4.1 Transparent Transmission ............................................................................................................................ 12
4.2 Sensor Data Collection .................................................................................................................................. 13
5 AT Command .................................................................................................................................................................. 14
5.1 AT Command Format Description ............................................................................................................. 14
5.2 AT Commands ................................................................................................................................................... 15
5.2.1 Start / Exit AT Command Mode ..................................................................................................... 15
5.2.2 Parameter Query / Configuration .................................................................................................. 15
5.2.3 RF Power Query / Configuration ................................................................................................... 15
5.2.4 Channel Query / Configuration ...................................................................................................... 16
5.2.5 Received RSSI Query ....................................................................................................................... 16
5.2.6 Device MAC Address Query........................................................................................................... 16
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5.2.7 Enable / Disable AD Voltage Collection ..................................................................................... 16
5.2.8 Software / Hardware Version Query ............................................................................................ 17
5.2.9 Module Restart ..................................................................................................................................... 17
5.2.10 Module Reset ..................................................................................................................................... 17
5.2.11 AT Command Table .......................................................................................................................... 17
6 Application, Implementation, and Layout............................................................................................................. 19
6.1 Module Photos .................................................................................................................................................. 19
6.2 Recommended PCB Footprint .................................................................................................................... 20
6.3 Antenna ................................................................................................................................................................ 20
6.4 Schematic Diagram ......................................................................................................................................... 21
6.5 Basic Operation of Hardware Design ...................................................................................................... 22
6.6 Trouble Shooting .............................................................................................................................................. 23
6.6.1 Unsatisfactory Transmission Distance ........................................................................................ 23
6.6.2 Vulnerable Module .............................................................................................................................. 24
6.6.3 High Bit Error Rate ............................................................................................................................. 24
6.7 Electrostatics Discharge Warnings ........................................................................................................... 24
6.8 Soldering and Reflow Condition ................................................................................................................. 24
4.9 Optional Packaging ......................................................................................................................................... 25
7 Certification ..................................................................................................................................................................... 26
7.1 Reach ................................................................................................................................................................... 26
7.2 RoHS .................................................................................................................................................................... 26
8 Revision History ............................................................................................................................................................ 27
9 Contact Us ....................................................................................................................................................................... 27
Table of Figures
Figure 1. Functional Block Diagram of RF-SM-1077B2 ............................................................................. 2
Figure 2. Working Mode of RF-SM-1077B1.................................................................................................... 3
Figure 3. Part Number Conventions of RF-SM-1077B1 ............................................................................ 3
Figure 4. Pin Diagram of RF-SM-1077B1 ........................................................................................................ 8
Figure 5. Photos of RF-SM-1077B1 ................................................................................................................. 19
Figure 6. Top View of RF-SM-1077B1 (mm) ................................................................................................. 20
Figure 7. Specification of Antenna Seat ......................................................................................................... 20
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Figure 8. Specification of IPEX Wire ................................................................................................................ 21
Figure 9. Schematic Diagram of RF-SM-1077B1 ....................................................................................... 21
Figure 10. Recommendation of Antenna Layout ......................................................................................... 23
Figure 11. Recommended Reflow for Lead Free Solder.......................................................................... 25
Figure 12. Optional Packaging Mode .............................................................................................................. 25
Figure 13. SRRC Certificate................................................................................................................................ 26
Figure 14. RoHS Certificate ................................................................................................................................ 26
Table of Tables
Table 1. Parameters of RF-SM-1077B1 ........................................................................................................... 7
Table 2. Pin Functions of RF-SM-1077B1 ....................................................................................................... 8
Table 3. Recommended Operating Conditions of RF-SM-1077B1 ...................................................... 10
Table 4. Handling Ratings of RF-SM-1077B1 .............................................................................................. 10
Table 5. Current Consumption of RF-SM-1077B1...................................................................................... 10
Table 6. Power Consumption of RF-SM-1077B1 ........................................................................................ 12
Table 7. AT Command Table ............................................................................................................................. 17
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2 Module Configuration and Functions
2.1 Module Parameters
Table 1. Parameters of RF-SM-1077B1
Chipset CC1310F128RGZ
Supply Power Voltage 1.8 V ~ 3.8 V, recommended to 3.3 V
Frequency 868 MHz, 915 MHz
Maximum Transmit Power +14.0 dBm
Receiving Sensitivity -124.0 dBm (@long range mode)
-110.0 dBm (@50 kpbs)
GPIO 30
Crystal 24 MHz, 32.768 kHz
RAM 20 KB
Flash 128 KB
Package SMT Packaging
Frequency Error ±20 kHz
Dimension 26.0 mm x 18.0 mm x (2.3 ± 0.1) mm
Type of Antenna IPEX interface
Operating Temperature -40 ℃ ~ +85 ℃
Storage Temperature -40 ℃ ~ +125 ℃
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2.2 Module Pin Diagram
Figure 4. Pin Diagram of RF-SM-1077B1
2.3 Pin Functions
Table 2. Pin Functions of RF-SM-1077B1
Pin Name Chip Pin Pin Type Description
1 P01 DIO_1 Digital I/O GPIO, Sensor Controller
2 P02 DIO_2 Digital I/O RX (GPIO, Sensor Controller)
3 P03 DIO_3 Digital I/O TX (GPIO, Sensor Controller)
4 P04 DIO_4 Digital I/O GPIO, Sensor Controller
5 P05 DIO_5 Digital I/O GPIO, Sensor Controller
6 P06 DIO_6 Digital I/O GPIO, Sensor Controller
7 P07 DIO_7 Digital I/O GPIO, Sensor Controller
8 P08 DIO_8 Digital I/O GPIO
9 P09 DIO_9 Digital I/O GPIO
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10 P10 DIO_10 Digital I/O GPIO
11 P11 DIO_11 Digital I/O GPIO
12 P12 DIO_12 Digital I/O GPIO
13 P13 DIO_13 Digital I/O GPIO
14 P14 DIO_14 Digital I/O GPIO
15 P15 DIO_15 Digital I/O GPIO
16 TMS JTAG_TMSC - JTAG TMS
17 TCK JTAG_TCKC - JTAG TCK
18 P16 DIO_16 Digital I/O JTAG TDO
19 P17 DIO_17 Digital I/O JTAG TDI
20 P18 DIO_18 Digital I/O GPIO
21 P19 DIO_19 Digital I/O GPIO
22 P20 DIO_20 Digital I/O GPIO
23 P21 DIO_21 Digital I/O GPIO
24 P22 DIO_22 Digital I/O GPIO
25 RESET RESET_N - Reset, active low. No internal pullup.
26 P23/ADC0 DIO_23 Digital or analog I/O GPIO, Sensor Controller, analog
27 P24/ADC1 DIO_24 Digital or analog I/O GPIO, Sensor Controller, analog
28 P25 DIO_25 Digital or analog I/O GPIO, Sensor Controller, analog
29 P26 DIO_26 Digital or analog I/O GPIO, Sensor Controller, analog
30 P27 DIO_27 Digital or analog I/O GPIO, Sensor Controller, analog
31 P28 DIO_28 Digital or analog I/O GPIO, Sensor Controller, analog
32 P29 DIO_29 Digital or analog I/O GPIO, Sensor Controller, analog
33 P30 DIO_30 Digital or analog I/O GPIO, Sensor Controller, analog
34 VCC VCC - 1.8 V ~ 3.6 V, recommended to 3.3 V
35 ANT - - External antenna pin
36 GND GND - ground
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3 Specifications
3.1 Recommended Operating Conditions
Functional operation does not guarantee performance beyond the limits of the conditional parameter values in the table
below. Long-term work beyond this limit will affect the reliability of the module more or less.
Table 3. Recommended Operating Conditions of RF-SM-1077B1
Items Condition Min. Typ. Max. Unit
Operating Supply Voltage Battery Mode 1.8 3.3 3.8 V
Operating Temperature / -40 +25 +85 ℃
Environmental Hot Pendulum / -20 +20 ℃/min
Notes:
To ensure the RF performance, the ripple wave on the source must be less than ±200 mV.
3.2 Handling Ratings
Table 4. Handling Ratings of RF-SM-1077B1
Items Condition Min. Typ. Max. Unit
Storage Temperature Tstg -40 +25 +125 ℃
Human Body Model HBM ±3000 V
Moisture Sensitivity Level 2
Charged Device Model ±500 V
3.3 Power Consumption
3.3.1 Current Consumption
The current consumption characteristics of this module are categorized into different running modes. The overall product
level current consumption is averaged over time on different power modes the device runs on. The peripheral circuitry’s
current consumption also adds in.
Table 5. Current Consumption of RF-SM-1077B1
Parameter Test Conditions Min. Typ. Max Unit
Core Current Consumption
Icore Core current
Reset. RESET_N pin asserted or VDDS below
power-on-reset (POR) threshold
100
nA
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consumption Shutdown. No clocks running, no retention 185 nA
Standby. With RTC, CPU, RAM and (partial)
register retention. RCOSC_LF
0.7
μA
Standby. With RTC, CPU, RAM and (partial)
register retention. XOSC_LF
0.8
μA
Idle. Supply Systems and RAM powered. 570 μA
Active. MCU running CoreMark at 48 MHz
1.2 mA + 25.5
µA/MHz
Active. MCU running CoreMark at 48 MHz 2.5 mA
Active. MCU running CoreMark at 24 MHz 1.9 mA
Radio RX, 868 MHz 5.5 mA
Radio TX, 10-dBm output power, (G)FSK, 868
MHz
13.4
mA
Radio TX, OOK modulation, 10-dBm output
power, AVG
11.2
mA
Radio TX, boost mode (VDDR = 1.95 V), 14-dBm
output power, (G)FSK, 868 MHz
23.5
mA
Radio TX, OOK modulation, boost mode (VDDR
= 1.95 V), 14 dBm, AVG
14.8
mA
Radio TX, boost mode (VDDR = 1.95 V), 15-dBm
output power, (G)FSK, measured on RF-SM-
1077B2, 433.92 MHz
25.1
mA
Radio TX, 10-dBm output power, measured on
RF-SM-1077B2, 433.92 MHz
13.2
mA
Peripheral Current Consumption (Adds to core current Icore for each peripheral unit activated) (1) (2) (3)
Iperi
Peripheral
power
domain
Delta current with domain enabled
20
µA
Serial power
domain Delta current with domain enabled
13
µA
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RF Core Delta current with power domain enabled, clock
enabled, RF core idle
237 µA
µDMA Delta current with clock enabled, module idle 130 µA
Timers Delta current with clock enabled, module idle 113 µA
I2C Delta current with clock enabled, module idle 12 µA
I2S Delta current with clock enabled, module idle 36 µA
SSI Delta current with clock enabled, module idle 93 µA
UART Delta current with clock enabled, module idle 164 µA
Note:
(1) Adds to core current Icore for each peripheral unit activated.
(2) Iperi is not supported in standby or shutdown modes.
(3) Measured at 3.0 V.
3.3.2 Power Consumption Test
Table 6. Power Consumption of RF-SM-1077B1
Mode Min. Current Max. Current Average Current Samples
Idle 1.29 mA 1.32 mA 1.31 mA 5000
Standby 68 nA 69.2 µA 980 nA 5000
Shutdown 52 nA 88 nA 79 nA 5000
RF-RX 5.2 mA 5.7 mA 5.4 mA 5000
RF-TX - 25.2 mA (14 dBm) - -
Note:
Test conditions: battery power supply: 2.88 V. Test instrument: RIGOL DM3068 digital multimeter.
Data of RF-TX only provide peak value as a reference, the average power is proportional to the frequency of data
transmission.
4 Functions
4.1 Transparent Transmission
Transparent transmission mode is that the data is transmitted to a remote device.
The function is realized under the following conditions:
1. Two or more devices are in the same frequency.
2. The address of the devices are allowed to connect each other.
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Users can define the channel of each device according to the condition, and only the devices which are in the same
frequency and the same channels can communicate. The device channel can be defined by AT command, please kindly
refer to the chapter of “AT Command”.
Transparent transmission rate: The device communicates through RF under IEEE 802.15.4g standard with three
transmission rates: 625 bps, 50 Kbps, 200 Kbps.
Data confirmation process mechanism is contained in transparent transmission. The mechanism contains timeout of
receiving confirmation packet. This protocol defines the values of timeout period in different mode:15 ms for 200 Kbps,
35 ms for 50 Kbps, 500 ms for 625 bps. At the same time, the packet sizes are regulated according to the different
modes:128 bytes for 200 Kbps and 50 Kbps data rate mode (the serial number size of the packet contains 2 bytes, so
the actual packet size is no more than 126 bytes), and 30 bytes for 625 bps data rate mode (the serial number size of
the packet contains 2 bytes, so the actual packet is no more than 28 bytes). When the packet size is over the defined
maximum packet size, the default processing mechanism is only sending packets with the same defined packet size,
and the extra data will be discarded directly.
Transparent transmission mechanism: The device starts transparent transmission mode by default when power on,
that is to say, the data which received from the serial port will be transmitted. "+++" string is the startup command of AT
command, transparent transmission mode will be disabled when serial port receives this command, and then the module
enters into AT command mode (please refer to “AT command” chapter for details). The module will enter into transparent
transmission mode after exiting AT command mode.
This module is designed for long distance transmission and lower data transmitting rate, transparent transmission mode
is recommended when lower requirement on low transmission rate.
4.2 Sensor Data Collection
CC1310 integrates a Sensor Controller, which supports data collection under low power mode. RTC provides work clock
for Sensor Controller, e.g. Sensor Controller executes operation every 100 ms when RTC clock settled in 100 ms, after
the operation executed. Sensor Controller will enter into low power consumption mode automatically. Application layer
can control the data collection frequency of sensor through RTC. Sensor Controller controls 7 digital I/Os (DIO1 ~ DIO7),
8 digital/simulation I/Os (DIO23 ~ DIO30), and these I/Os can be configured as SPI, I2C, ADC etc.
This protocol is configured with AD voltage acquisition function by default. This function enables two ADC channels
(channel 0 is DIO23, channel 1 is DIO24). AD voltage acquisition range is 0 V~ 3.8 V. Sensor Controller control RTC to
provide the clock for AD acquisition, and collect data once every second by default. Users can control the enable and
disable of AD voltage collection through AT commands (please refer to “AT command” chapter for details).
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5 AT Command
The string which starts with "AT#" will be parsed and executed as an AT command, and the AT command will be returned
from the serial port as it is. Then the execution result will be output. "OK↲" means successful operation, "ERROR↲"
means error operation, and "FAIL↲" means failed operation.
5.1 AT Command Format Description
AT command format: "AT#EXIT" + "Enter". The letters in AT commands are not case-sensitive unless otherwise
specified. The specific format is as follows:
AT command start character: All AT commands must start with "AT" characters, which is not case-sensitive.
Command delimiter: The separator of "AT" start character and the command type is fixed as "#" character.
AT command type: AT command type, such as "RF", "UART", which is not case-sensitive.
Parameter separator: Parameter separator is used to separate the command type and configuration parameters or
separate multiple configuration parameters, which is fixed as a space bar.
Parameter start character: The configuration parameter start character indicates the start character of the configuration
parameter, which is fixed as "-".
Parameter identifier: Parameter identifier indicates the meaning of the configuration parameter. The different
configuration parameters of the identifier will be different, which is not case-sensitive. Please refer to “AT Command” for
details.
Parameter configuration: Different configuration parameters have different range of values, please refer to t“AT
Command” for details.
Command end character: AT Command terminator is used to indicate that the command ends, which is fixed as
carriage return linefeed “↲”(\r\n).
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5.2 AT Commands
5.2.1 Start / Exit AT Command Mode
"+++": Start AT command mode.
Enter the command into serial port means that the device will enter into AT command mode. When the serial port prints
"OK↲", which means start the AT command mode successfully. Then the data received from the serial port will be
regarded as AT command.
"AT#EXIT↲": Exit AT command mode.
Enter the command into serial port means that the device will exit AT command mode and then enter into transparent
transmission mode. When the serial port prints "OK↲", which means exit AT command mode successfully. Then the
data except "+++" received from the serial port will be transmitted as transparent data.
5.2.2 Parameter Query / Configuration
"AT#UART↲": Query parameter.
Enter the command into the serial port. When the serial port prints "OK↲", which means successful operation, in the
meanwhile, the device parameters will be returned. If “AT#UART-Bxxxx-Dx-Px-Sx” is returned, where “-B” is the baud
rate, “-D” is the data bit, “-P” is the parity bit, “-S” is the stop bit. If the command format is incorrect, the serial port will
return "ERROR↲".
"AT#UART-Bxxxx-Dx-Px-Sx↲": Configure parameter.
Enter the command into serial port. When the serial port prints "OK↲", which means successful operation. In this
command, “-B” is the baud rate, “-D” is the data bit, “-P” is the parity bit, “-S” is the stop bit. If the instruction format is
incorrect, the serial port will return "ERROR↲".
The parameter configuration command is saved into FLASH by default. After the devices is restarted, the device will
start with the parameters set in FLASH.
Default configuration: 115200 baud rate, 8 data bit, no parity bit, 1 stop bit.
5.2.3 RF Power Query / Configuration
"AT#RF↲": Query Tx power.
Enter the command into serial port. When the serial port prints "OK↲", which means successful operation. In the
meanwhile, the RF output power of the device will be returned. If "AT#RF-Px↲" is returned, where “-Px” means the RF
output power. If the command format is incorrect, the serial port will return "ERROR↲".
"AT#RF-Pxx↲": Configure RF power.
Enter the command into serial port. When the serial port prints "OK↲", which means successful operation. In the
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command, “-Px” means the RF output power. The parameter of RF-SM-1077B1 supports any value of -10 dBm ~ 14
dBm. If the command format is incorrect, the serial port will return "ERROR↲".
Default configuration: RF-SM-1077B1: output power of 14 dBm (@868 MHz).
5.2.4 Channel Query / Configuration
"AT#CHN↲": Query channel.
Enter the command into serial port. When the serial port prints "OK↲", which means successful operation. In the
meanwhile, the channel of this device will be returned. If "AT#CHN-Cx↲" is returned, where “-Cx” means the channel
parameter. If the command format is incorrect, the serial port will return "ERROR↲".
"AT#CHN-Cx↲": Configure channel.
Enter the command into serial port. When the serial port prints "OK↲", which means successful operation. In the
command, “-C” means the RF channel. The parameter of RF-SM-1077B1 supports any value from 0 to 6. If the command
format is incorrect, the serial port will return "ERROR↲".
Default configuration: channel 0.
5.2.5 Received RSSI Query
"AT#RSSI↲": Query received RSSI.
Enter the command into serial port. When the serial port prints "OK↲", which means successful operation. In the
meanwhile, the received signal strength indicator value of the device for the last time will be returned. If "AT#RSSI-Rx↲"
is returned, where “-Rx” means the RSSI. If the command format is incorrect, the serial port will return "ERROR↲".
If the command is entered when the device have no data received, the default return value is 255.
5.2.6 Device MAC Address Query
"AT#RSSI↲": Query device MAC address.
Enter the command into serial port. When the serial port prints "OK↲", which means successful operation. In the
meanwhile, the 6-byte MAC address of the device will be returned. If "AT#MAC-Mxxxxxxxxxxxx↲" is returned, where “-
Mxxxxxxxxxxxx” means the MAC address. If the command format is incorrect, the serial port will return "ERROR↲".
5.2.7 Enable / Disable AD Voltage Collection
"AT#ADC-Ex↲": Collect AD voltage.
In this command, “-E” means enable AD voltage collection function. If x is 1, which means start AD voltage collection. If
x is 0, which means disable AD voltage collection. Enter the command into serial port. When the serial port prints "OK↲",
which means successful operation. If enable AD voltage collection function, the device will start AD voltage collection in
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ADC channel 0,1, and the serial port will return data in ADC channel 0,1 every second. If disable AD voltage collection
function, the device will stop AD voltage acquisition in ADC channel 0,1 and no data return. AD voltage collection
supports 0 V ~ 3.8 V, and the serial port return value is the integer from 0 mV to 3800 mV.
5.2.8 Software / Hardware Version Query
"AT#VER↲": Query module software / hardware version.
Enter the command into serial port. When the serial port prints "OK↲", which means successful operation. In the
meanwhile, the software and hardware version number will be returned. If "AT#VER-Sm1.0.0-D1077B1↲" is returned,
where “-S” means software and the string of “m1.0.0” means the version number is1.0.0, “-Dx” means hardware and the
string of “1077B1” means the hardware version is 1077B1.
5.2.9 Module Restart
"AT#RESTART↲": Restart module.
Enter the command into serial port. When the serial port prints "OK↲", which means successful operation. In the
meanwhile, the device will be automatically restarted after 100 ms. After restart is done, the serial port prints "Application
Start↲". If users want to enter the AT command mode again, "+++" need to be sent, please refer to AT command chapter
for details.
5.2.10 Module Reset
"AT#RESET↲" is module reset command.
Enter the command into serial port. When the serial port prints "OK↲", which means successful operation. In the
meanwhile, all the parameters of the device are restored to the factory settings when the device starts next time.
5.2.11 AT Command Table
Table 7. AT Command Table
AT command Parameters Description
+++ No "+++": Start AT command mode.
"OK" indicates successful operation. Otherwise, the operation failed.
AT#EXIT No "AT#EXIT↲": Exit AT command mode.
"OK" indicates successful operation. Otherwise, the operation failed.
AT#VER No
"AT#VER↲": Query Module software and hardware version.
"OK" indicates successful operation and the serial port will return
software and hardware version, such as: AT#VER-Sm1.0.0-D1077B1.
Otherwise, the operation failed.
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AT#RESTART No
"AT#RESTART↲": Module restart command.
"OK" indicates successful operation and the device will restart after 100
ms, otherwise the operation failed.
AT#RESET No
"AT#RESET↲": Module reset command. The device configuration
parameters are restored to the factory settings.
"OK" indicates successful operation and all the parameters of the device
are restored to the factory settings in next time when the device starts to
work.
AT#UART
-B: Baud rate (default
115200 bps)
-D: Data bit (default 8)
-P: Parity bit (default 0)
-S: Stop bit (default 1)
"AT#UART↲": Query parameters.
"OK" indicates successful operation and the serial port software prints
the current serial port configuration parameters, such as "AT#UART-
B11520-D8-P0-S1↲", otherwise the operation failed.
"AT#UART-B11520-D8-P0-S1↲": Configure parameters.
Baud rate supports: 115200, 38400, 57600, 14400, 9600, 4800.
Data bit supports: 8, 7, 6, 5.
Parity bit supports: 0 and 1.
Stop bit supports: 0 and 1.
"OK" indicates successful operation, "ERROR" indicates wrong
command and "FAIL" indicates failed operation.
AT#RF
-P: RF output power
Default: 14 dBm @868
MHz
"AT#RF↲": Query RF parameter.
"OK" indicates successful operation and the serial port returns the
current RF parameters, such as "AT#RF-P14 ↲", otherwise the operation
failed.
"AT#RF-P14↲": Configure parameters.
Output power supports: any value from -10 dBm ~ 14 dBm.
"OK" indicates successful operation, "ERROR" indicates wrong
command and "FAIL" indicates the failed operation.
AT#ADC
-E1: Enable data
collection of ADC
channel
-E0: Disable data
collection of ADC
channel
"AT#ADC-E1↲": Enable data collection of ADC channel 0, 1.
"OK" indicates successful operation and the serial port will print data
values of ADC channel 0,1 every second (voltage acquisition range
support 0 V ~ 3.8 V), otherwise the operation failed.
"AT#ADC-E0↲": Disable data collection of ADC channel 0,1.
"OK" indicates successful operation and shuts down data collection of
ADC channel 0,1.
AT#CHN -C: RF channel setup "AT#CHN↲": Query RF channel.
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"OK" indicates successful operation and the serial port software will print
RF channel parameter, otherwise the operation failed.
"AT#CHN-C1↲": Configure RF channel.
Set RF channel value as 1, "OK" indicates successful operation and the
parameter will be effective after restart.
Note:
AT Command with “” is the completed one.
6 Application, Implementation, and Layout
6.1 Module Photos
Figure 5. Photos of RF-SM-1077B1
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6.2 Recommended PCB Footprint
Figure 6. Top View of RF-SM-1077B1 (mm)
6.3 Antenna
RF-SM-1077B1 module is integrated the IPEX version 1 antenna seat, the specification of antenna seat is as follow:
Figure 7. Specification of Antenna Seat
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The specification of IPEX wire end is as follow:
Figure 8. Specification of IPEX Wire
6.4 Schematic Diagram
Figure 9. Schematic Diagram of RF-SM-1077B1
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6.5 Basic Operation of Hardware Design
1. It is recommended to offer the module with a DC stabilized power supply, a tiny power supply ripple coefficient and
the reliable ground. Please pay attention to the correct connection between the positive and negative poles of the
power supply. Otherwise, the reverse connection may cause permanent damage to the module;
2. Please ensure the supply voltage is between the recommended values. The module will be permanently damaged
if the voltage exceeds the maximum value. Please ensure the stable power supply and no frequently fluctuated
voltage.
3. When designing the power supply circuit for the module, it is recommended to reserve more than 30% of the margin,
which is beneficial to the long-term stable operation of the whole machine. The module should be far away from the
power electromagnetic, transformer, high-frequency wiring and other parts with large electromagnetic interference.
4. The bottom of module should avoid high-frequency digital routing, high-frequency analog routing and power routing.
If it has to route the wire on the bottom of module, for example, it is assumed that the module is soldered to the Top
Layer, the copper must be spread on the connection part of the top layer and the module, and be close to the digital
part of module and routed in the Bottom Layer (all copper is well grounded).
5. Assuming that the module is soldered or placed in the Top Layer, it is also wrong to randomly route the Bottom Layer
or other layers, which will affect the spurs and receiving sensitivity of the module to some degrees;
6. Assuming that there are devices with large electromagnetic interference around the module, which will greatly affect
the module performance. It is recommended to stay away from the module according to the strength of the
interference. If circumstances permit, appropriate isolation and shielding can be done.
7. Assuming that there are routings of large electromagnetic interference around the module (high-frequency digital,
high-frequency analog, power routings), which will also greatly affect the module performance. It is recommended
to stay away from the module according to the strength of the interference. If circumstances permit, appropriate
isolation and shielding can be done.
8. It is recommended to stay away from the devices whose TTL protocol is the same 868 MHz physical layer.
9. The antenna installation structure has a great influence on the module performance. It is necessary to ensure the
antenna is exposed and preferably vertically upward. When the module is installed inside of the case, a high-quality
antenna extension wire can be used to extend the antenna to the outside of the case.
10. The antenna must not be installed inside the metal case, which will cause the transmission distance to be greatly
weakened.
11. The recommendation of antenna layout.
The inverted-F antenna position on PCB is free space electromagnetic radiation. The location and layout of antenna
is a key factor to increase the data rate and transmission range.
Therefore, the layout of the module antenna location and routing is recommended as follows:
(1) Place the antenna on the edge (corner) of the PCB.
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(2) Make sure that there is no signal line or copper foil in each layer below the antenna.
(3) It is the best to hollow out the red part of the antenna position in the following figure so as to ensure that S11
of the module is minimally affected.
Figure 10. Recommendation of Antenna Layout
6.6 Trouble Shooting
6.6.1 Unsatisfactory Transmission Distance
1. When there is a linear communication obstacle, the communication distance will be correspondingly weakened.
Temperature, humidity, and co-channel interference will lead to an increase in communication packet loss rate. The
performances of ground absorption and reflection of radio waves will be poor, when the module is tested close to
the ground.
2. Seawater has a strong ability to absorb radio waves, so the test results by seaside are poor.
3. The signal attenuation will be very obvious, if there is a metal near the antenna or the module is placed inside of the
metal shell.
4. The incorrect power register set or the high data rate in an open air may shorten the communication distance. The
higher the data rate, the closer the distance.
5. The low voltage of the power supply is lower than the recommended value at ambient temperature, and the lower
the voltage, the smaller the power is.
6. The unmatchable antennas and module or the poor quality of antenna will affect the communication distance.
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6.6.2 Vulnerable Module
1. Please ensure the supply voltage is between the recommended values. The module will be permanently damaged
if the voltage exceeds the maximum value. Please ensure the stable power supply and no frequently fluctuated
voltage.
2. Please ensure the anti-static installation and the electrostatic sensitivity of high-frequency devices.
3. Due to some humidity sensitive components, please ensure the suitable humidity during installation and application.
If there is no special demand, it is not recommended to use at too high or too low temperature.
6.6.3 High Bit Error Rate
1. There are co-channel signal interferences nearby. It is recommended to be away from the interference sources or
modify the frequency and channel to avoid interferences.
2. The unsatisfactory power supply may also cause garbled. It is necessary to ensure the power supply reliability.
3. If the extension wire or feeder wire is of poor quality or too long, the bit error rate will be high.
6.7 Electrostatics Discharge Warnings
The module will be damaged for the discharge of static. RF-star suggest that all modules should follow the 3 precautions
below:
1. According to the anti-static measures, bare hands are not allowed to touch modules.
2. Modules must be placed in anti- static areas.
3. Take the anti-static circuitry (when inputting HV or VHF) into consideration in product design.
Static may result in the degradation in performance of module, even causing the failure.
6.8 Soldering and Reflow Condition
1. Heating method: Conventional Convection or IR/convection.
2. Temperature measurement: Thermocouple d = 0.1 mm to 0.2 mm CA (K) or CC (T) at soldering portion or equivalent
methods.
3. Solder paste composition: Sn/3.0 Ag/0.5 Cu
4. Allowable reflow soldering times: 2 times based on the following reflow soldering profile.
5. Temperature profile: Reflow soldering shall be done according to the following temperature profile.
6. Peak temperature: 245 ℃.
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Figure 11. Recommended Reflow for Lead Free Solder
4.9 Optional Packaging
Figure 12. Optional Packaging Mode
Note: Default tray packaging.
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7 Certification
7.1 Reach
Reach Certificate No.: C181213010001
Figure 13. SRRC Certificate
7.2 RoHS
Reach Certificate No.: C181213010002
Figure 14. RoHS Certificate
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8 Revision History
Date Version No. Description Author
2017.10.19 V1.0 The initial version is released. Levi
2018.03.12 V2.0 Add commands. Levi
2018.01.24 V2.1 Add inquiry MAC address function. Levi
2018.08.02 V2.1 Update company address. Aroo Wang
9 Contact Us
SHENZHEN RF-STAR TECHNOLOGY CO., LTD.
Shenzhen HQ:
Add.: Room 601, Block C, Skyworth Building, High-tech Park, Nanshan District, Shenzhen, Guangdong, China
Tel.: 86-755-8632 9687
Chengdu Branch:
Add.: No. B4-12, Building No.1, No. 1480 Tianfu Road North Section (Incubation Park), High-Tech Zone, Chengdu,
China (Sichuan) Free Trade Zone, 610000
Tel.: 86-28-6577 5970
Email: [email protected], [email protected]
Web.: www.szrfstar.com