FS970X

Rev. 4.4

40/46

COMMON

10K

0.99



0.01



uA

10A

mA+uA

99



mA

AGND

SGND

SA

1M



27nF

INH

INL

FTR

FTR

BPFTR

ADIMUX

ADIMUX

FTB

FTC

FTA

OFF CHIP

ON CHIP

OFF CHIP

30K



ACDIV

ACEN

60K



10K



AGND

ACDIVB

ACBUF

CMPMUX

29

26

23

24

17

38

37

Graph 21.

Function network diagram of DC current.

Address

00

01

02

03

04

05

06

07

08

Register

RDG

SIN

SRF

SCP

AFT

ADG

SETADC MISC1 MISC2

5000uA, 500mA, 10A

00h

80h

08h

20h

10h

93h

9Fh

00h

80h

500uA, 5mA, 5A

00h

80h

08h

20h

30h

93h

9Fh

00h

80h

Chart 27. DC current register setup.

AS shown in Graph , and assuming the transferring resistor to be approx. 100, the transferring voltage will be

0.5V under 5.0000 mA. It will then flow into ADC through the ACBUF buffer of 1 (ACDIV=AFT<5>=0). Under

50.000 mA, when using the transferring resistor of 100, the transferring voltage of 5V will be too high. If

using 1, the transferring voltage will be 50mV, and the gain of ACBUF will be 10 (ACDIV=AFT<5>=1). Amplify

the signal 10-times before feeding it into ADC.