1Preliminary Rev 1.0 © 2016 Sendyne Corp.

Sendyne® Sensing Products Family

Sendyne SFPGFDMOD Ground Fault Detection and Current Measurement

DescriptionThe Sendyne SFPGFDMOD is a module showcasing

Sendyne’s ground fault detection, high voltage and

current measurement/Coulomb counting IC.

Sendyne’s AEC-Q100 qualified SFPGFD continuously

monitors isolation resistance for deterioration of isola-

tion and possible dangerous levels of leakage current.

It is able to detect all sources of leakage, including

multiple simultaneous asymmetrical and symmetrical

faults, as well as resistive shorts between the chassis

and points in the battery that have the same potential

as the chassis. An advanced algorithm applies deep fil-

tering and averaging on the measured data, resulting

in a high level of noise rejection. After a start-up time

of 4 seconds, the system provides the measured value

of the isolation resistance. Thereafter, the system

continuously monitors the isolation resistance with

new values provided every two seconds.

That said, the magnitudes of the voltage excursions

and noise are continuously monitored for their effect

on the measurement accuracy; when noise or momen-

tary fluctuations would bring about deterioration of

the measurement accuracy past a pre-set value (typi-

cally ± 5%), the system stops the updates for the

isolation resistance value until the high levels of noise

subside.

In addition to providing isolation monitoring, the

SFPGFD module has four high voltage channels that

can be used for monitoring pre-charge status, state

of fuses, contactors, etc. All six voltage channels can

measure ±450 V continuous and ±650 V momentary

overvoltage. These levels can easily be extended for

systems operating at higher voltages.

The module also provides precision current measure-

ment (±0.25%) for a measurement range of

±300 A continuous, ±1500 A peak, over the full

temperature range of -40 OC to +125 OC.

Applications ― HEV and EV Power systems monitoring

― Battery monitoring for charging stations, indus-

trial, railroad and utility-scale storage

Sendyne SFPGFDMOD

Operating Specifications

Parameter Value

Power supply +(7-24) V

Interface LIN

Shunt value 25 μOhm

Current measurement range 300 A continuous/ 1500 A peak

Voltage measurement range ±450 V Continuous, ±650 V momentary overvoltage (no clipping)

Rating SFPGFD IC is AEC-Q100 qualified

Module operating temperature range -40 OC to +125 OC

2 Preliminary Rev 1.0 © 2016 Sendyne Corp.

Sendyne SFPGFDMOD

SFPGFDMOD Block Diagram

Isol

ated

DC

/DC

Isol

ated

I/O

SFPG

FD C

ircu

it

+5

V

(Loc

al) G

ND

~15

0 m

W

VA

C

(noi

se)

RIS

O

(unk

now

n)

Leak

age

can

orig

inat

e an

ywhe

re a

long

this

pat

h,

or in

the

rest

of t

he p

ower

ci

rcui

ts (c

onne

cted

to P

/N

term

inal

s of

the

batt

ery)

To

the

rest

of

the

pow

er c

ircu

it (b

atte

ry p

ositi

ve

term

inal

)

VD

C

(unk

now

n)

Serv

ice

Dis

conn

ect

Switc

h

N

P

CH

ASI

SS

Loca

l Ref

/ A

nalo

g G

ND

/ I

SO V

SS

Switc

hing

&

E

MI

Filte

rs

SFP-

GFD

IC R

x

Tx

VX

1+

VX

2+

VX

1-

Cur

rent

M

easu

rem

ents

+7

V

ISO

VSS

VE

XI

0 V

dc o

r +

25 V

dc

Isol

ated

Vol

tage

Exc

itat

ion

Sour

ce

4

Exc

itatio

nco

ntro

l

RSD

S

RH

V1

RH

V2

VX

2-

LIN

Bus

Cab

le T

xD

Cab

le R

xD

+25

V

CH

ASS

IS a

nd

(Loc

al) G

ND

m

ay

or m

ay n

ot

be c

onne

cted

To th

e re

st o

f the

pow

er c

ircu

it

(bat

tery

neg

ativ

e te

rmin

al)

Para

siti

c or

inte

ntio

nal p

lace

dca

paci

tanc

e

~20

mW

VX

3

VX

4

VX

5

VX

6

V S1

V S2V

S3V

S4

LDO

7-24

V

LIN

Tran

scei

ver

3Preliminary Rev 1.0 © 2016 Sendyne Corp.

Sendyne SFPGFDMOD

Evaluation System ComponentsThe SFPGFDMOD system consists of the SFP104EVB

AFE board (that includes Sendyne’s SFPGFD IC

thermally coupled to the attached 25-μΩ shunt ) and

the SFPC104ASY I/O/Power Isolator and Excitation

Driver board.

LIN Node Configuration File (NCF)Sendyne provides a Node Capability File (NCF) for

communications with the SFPGFD. That file can be

accessed here.

LIN Protocol Battery_current_voltage, 7 bytes

― Current Value (3 bytes, offset 0, signed, least sig-

nificant bit is 200 microamps)

― Voltage Value (3 bytes, offset 24, signed, least sig-

nificant bit is 78.125 microvolts)

― Fault state (2 bits, offset 48 bits, (0 = no result, 1 =

failed, 2 = passed))

― Error bit(1 bit, offset 55, (1 = yes error since last

communication, 0 = no error since last communi-

cation)

Coulomb_count, 6 bytes ― Coulomb (6 bytes, offset 0, signed, least significant

bit is 250 nano coulomb)

System_voltages, 8 bytes ― VS1 (2 bytes, offset 0, signed, least significant bit is

20 millivolts)

― VS2 (2 bytes, offset 16, signed, least significant bit

is 20 millivolts)

― VS3 (2 bytes, offset 32, signed, least significant bit

is 20 millivolts)

― VS4 (2 bytes, offset 48, signed, least significant bit

is 20 millivolts)

Isolation, 4 bytes ― Isolation_resistance (2 bytes, offset 0, least signifi-

cant bit is 100 ohms)

― Fault_location(1 byte, offset 16, signed, % above/

below negative battery voltage)

― Gnd_connection(1 bit, offset 24, {1 = ground con-

nection connected, 0 = ground connection uncon-

nected)

Lin spec: 2.2Diagnostic class: 2

Default NAD: 0x60

Supplier ID: 0x7FFF, Function ID: 0x5343, variant: 0

bitrate: 19.2 kilobit/s

4 Preliminary Rev 1.0 © 2016 Sendyne Corp.

Sendyne SFPGFDMOD

Using SFPGFDMOD for Ground Fault Detection

To LOAD orother circuits

To LOAD orother circuits

Two equal“Y” EMI Caps50 nF min1.25 μF Max each

Leakage can originateat any point withinthe battery or withinthe Load or Charger

Resistor with a probeto test (simulate) the isolation resistance

To LIN Master

VS1 through VS4 areconnected as required

Contribution of VS1through VS4 to leakage is included inthe reported total

CHASSIS

VBAT+

VS1

VS2 LIN

CHASSISVS3

VS4

5Preliminary Rev 1.0 © 2016 Sendyne Corp.

Sendyne SFPGFDMOD

Sendyne SFP104EVB Schematics

6 Preliminary Rev 1.0 © 2016 Sendyne Corp.

Sendyne SFPGFDMOD

Sendyne SFPC104ASY Schematics, page 1

7Preliminary Rev 1.0 © 2016 Sendyne Corp.

Sendyne SFPGFDMOD

Sendyne SFPC104ASY Schematics, page 2

8 Preliminary Rev 1.0 © 2016 Sendyne Corp.

Sendyne SFPGFDMOD

SFP-GFD Software GUI Overview

Main Screen ― VBAT+ Measured voltage across battery

― VS1- Measured voltage of VS1

― VS2- Measured voltage of VS2

― VS3 - Measured voltage of VS3

― VS4 - Measured voltage of VS4

― All voltages are measured with respect to shunt

negative terminal.

― Fault- Any SFPGFDMOD internal fault detected

― Error- If there were any LIN communication issues

detected

― Coulomb - Coulomb counter

― Current - Current across the SFPGFDMOD Shunt

― Isolation Resistance

― Fault Location- leakage % above/below negative

battery voltage

Manual Tab ― Buttons for reading each PID and configuring the

SFP LIN interface

― Data being sent back from each PID

Simple, first-time use procedure:

― Connect the SFPGFDMOD to the PC

― Open the SFP-GFD GUI

― Click “Start” to have the GUI poll the SFPGFDMOD

for data

9Preliminary Rev 1.0 © 2016 Sendyne Corp.

Sendyne SFPGFDMOD

Ordering Information

Part Number Description

SFPGFDMOD SFPGFD Module

SFPGFD1ACPZA SFPGFD IC

To order contact Sendyne at: sales@sendyne.com

Revision History

Revision Table

Revision Number Date Comments

1.0 04/05/2016 Preliminary; initial release

10 Preliminary Rev 1.0 © 2016 Sendyne Corp.

Sendyne SFPGFDMOD

Information contained in this publication regarding

device applications and the like is provided only for

your convenience and may be superseded by updates.

It is your responsibility to ensure that your application

meets with your specifications.

SENDYNE MAKES NO REPRESENTATIONS OR

WARRANTIES OF ANY KIND WHETHER EX-

PRESSED OR IMPLIED, WRITTEN OR ORAL,

STATUTORY OR OTHERWISE, RELATED TO THE

INFORMATION, INCLUDING BUT NOT LIMITED

TO ITS CONDITION, QUALITY, PERFORMANCE,

MERCHANTABILITY OR FITNESS FOR PURPOSE.

Sendyne disclaims all liability arising from this in-

formation and its use. Use of Sendyne devices in life

support and/or safety applications is entirely at the

buyer’s risk, and the buyer agrees to defend, indemni-

fy and hold harmless Sendyne from any and all dam-

ages, claims, suits, or expenses resulting from such

use. No licenses are conveyed, implicitly or otherwise,

under any Sendyne intellectual property rights.

PatentsUS Pat. 8,264,216

US Pat. 8,289,030

US Pat. 9,052,343

US Pat. 9,217,759

Other patents pending

TrademarksThe Sendyne name and logo are registered trademarks

of Sendyne Corp.

All other trademarks mentioned herein are properties

of their respective owners.

© 2016 Sendyne Corp.

All Rights Reserved.

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