Programmable Six Supply Sequencer and Supervisor

2
Many FPGAs, ASICs and microprocessors require tight accuracy and complex sequencing of their power supplies for high reliability and to prevent processor damage. The LTC ® 2937 is designed to carefully control and supervise these point-of-load supplies, while providing flexibility to reconfigure on the fly—effectively future proofing the design. A unique and flexible sequencing technique turns supplies on and off in any one of 1023 possible sequence positions, separated either with adjustable time delays or by qualifying events. Digitally adjustable ±0.75% accurate undervoltage (UV) and overvoltage (OV) thresholds reduce development time, improve system reliability, and ease resulting power supply tolerances. A simple single wire connection synchronizes up to fifty LTC2937s for sequencing expansion to 300 supplies, simplifying board routing. The LTC2937, along with the LTC2933 and LTC2936 programmable 6-channel voltage supervisors, is supported by an interactive and intuitive GUI for configuration, system diagnostics and debugging. Features n Time and Event Based Sequencing for 6 Power Supplies n 12 Programmable UV and OV Comparators with ±0.75% Guaranteed Accuracy Over Temperature n I 2 C/SMBus Adjustable 8-Bit UV and OV Thresholds n EEPROM for Storing Configuration and Fault Log n Single Wire Synchronizes up to 50 Devices and 300 Supplies n Supported by LTpowerPlay™ GUI n No Software Coding Required for Autonomous Operation n Breakpoints and Sequence Stepping n Programmable Reset Output Delay n Wide Supply Range: 2.9V to 16.5V n 28-Pin 5mm x 6mm QFN Package Eases Sequencing and Voltage Supervision of FPGA/ASIC/µProcessor Supplies Programmable Six Supply Sequencer and Supervisor LTC2937 SEQUENCER EEPROM UV/OV THRESHOLDS STATUS OK FAULT LOGGING 2.5V ENABLE 6x 1.5V 1.2V 1.8V 3.3V 5V I 2 C/SMBus MARGIN RESET ON System Logic DC/DC Converters 5V 3.3V 2.5V 1.8V 1.5V 1.2V ON VOLTAGE V1 V2 V3 V4 V5 V6 TIME Sequenced Power Supply Waveforms L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and LTpowerPlay is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.

Transcript of Programmable Six Supply Sequencer and Supervisor

Many FPGAs, ASICs and microprocessors require tight accuracy and complex sequencing of their power supplies for high reliability and to prevent processor damage. The LTC®2937 is designed to carefully control and supervise these point-of-load supplies, while providing flexibility to reconfigure on the fly—effectively future proofing the design. A unique and flexible sequencing technique turns supplies on and off in any one of 1023 possible sequence positions, separated either with adjustable time delays or by qualifying events. Digitally adjustable ±0.75% accurate undervoltage (UV) and overvoltage (OV) thresholds reduce development time, improve system reliability, and ease resulting power supply tolerances. A simple single wire connection synchronizes up to fifty LTC2937s for sequencing expansion to 300 supplies, simplifying board routing. The LTC2937, along with the LTC2933 and LTC2936 programmable 6-channel voltage supervisors, is supported by an interactive and intuitive GUI for configuration, system diagnostics and debugging.

Features n Time and Event Based Sequencing for 6 Power Supplies n 12 Programmable UV and OV Comparators with ±0.75% Guaranteed Accuracy Over Temperature

n I2C/SMBus Adjustable 8-Bit UV and OV Thresholds n EEPROM for Storing Configuration and Fault Log n Single Wire Synchronizes up to 50 Devices and 300 Supplies n Supported by LTpowerPlay™ GUI n No Software Coding Required for Autonomous Operation n Breakpoints and Sequence Stepping n Programmable Reset Output Delay n Wide Supply Range: 2.9V to 16.5V n 28-Pin 5mm x 6mm QFN Package

Eases Sequencing and Voltage Supervision of FPGA/ASIC/µProcessor Supplies

Programmable Six Supply Sequencer and Supervisor

LTC2937

SEQUENCER

EEPROM

UV/OV THRESHOLDS

STATUS OK

FAULT LOGGING

2.5V

ENABLE 6x

1.5V

1.2V

1.8V

3.3V

5V

I2C/SMBus

MARGIN

RESET

ON

SystemLogic

DC/DC Converters

5V

3.3V

2.5V

1.8V

1.5V

1.2V

ON

VOLT

AGE

V1V2V3V4

V5

V6

TIME

Sequenced Power Supply Waveforms

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and LTpowerPlay is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.

LTpowerPlay Development Environment

Programmable 6-Channel Sequencer and Supervisors with EEPROM

Programmable Time and Event Based Sequencing Example

LLTC2937

2.9V TO 16.5V

FAULTB

RSTB

VPWR

GND

EN1

EN2

EN3

EN4

EN5

EN6

V1

V2

V3

V4

V5

V6

VCORE1

VIO1

READY

SYSTEM 1µP/FPGA

VCORE2

VIO2

VAUXSYSTEM 2µP/FPGA

ON

SDA

SCL

SPCLK

n System 1: Core and I/O supplies separated with time delay (t1)

n System 2 supplies wait for READY signal from System 1 to cross V3 threshold (event based delay t2)

n System 2: Core, I/O and Aux supplies separated with time delays

n Sequence position clock (SPCLK) connects to other LTC2937s for expansion

Device Sequencer Comparator Outputs

Threshold Range

Threshold Accuracy Power Supply Package

(mm × mm) Demo Board*

LTC2933 No No 1V to 13.9V (1×)0.2V to 5.8V (5×) ±1% 3.4V to 13.9V 5×4 DFN-16,

SSOP-16 DC1633

LTC2936 No Yes 0.2V to 5.8V (6×) ±1% 3.13V to 13.9V 4×5 QFN-24, SSOP-24 DC1605

LTC2937 Yes No 0.2V to 6V (6×) ±0.75% 2.9V to 16.5V 5×6 QFN-28 DC2313

* DC1613 I2C-USB adapter connects demo board to computer running LTpowerPlay

VCORE1

VIO1READY

VCORE2VIO2

VAUX

SYSTEM 2 DOES NOT SEQUENCE UNTIL SYSTEM 1 IS READY

t1 t2TIME

DELAYEVENT DELAY

0815

www.linear.com/2937 n 1-800-4-LINEAR