FS970X

Rev. 4.4

39/46

AC Voltage (ACV)

Vx

TENM

10M



R

FUSE+PTC

1M

 or 100K or 10K or 1K

XOHM

COMMON

10K

AGND

SGND

DCV

XOHM

XOHM

TENM<0>

ON CHIP

OFF CHIP

CPN

AGND

CPN<1>

CPN<0>

C

COMPENSATION

C

DECOUPLE

ACEN

CMPEN1

ACBUF

CMP1

AGND

1M



27nF

INH

INL

FTR

FTR

BPFTR

ADIMUX

ADIMUX

FTB

FTC

FTA

OFF CHIP

FREQ

CMPMUX

ACL

SGND

ACH

90K



ACDIV

10K



AGND

ACDIVB

10uF

RCTOP

2k



RCTEN

ACH

AGND

100

K



47 nF

ACL

25

19~22

18

17

38

37

40

39

42

43

36

35

41

23

24

17

Graph

20. Function network diagram of AC voltage.

Address

00

01

02

03

04

05

06

07

08

Register

RDG

SIN

SRF

SCP

AFT

ADG

SETADC MISC1 MISC2

0.5V

10h

5Bh

00h

10h

F0h

93

9F

00

00

5V~100V

x0h

5Bh

00h

10h

D0h

93h

9Fh

00h

00h

Chart 26. AC voltage register setup.

Whereas, the value of RGD<7:4> is determined by the function, as show in Chart .

The voltage signal of 5V~1000V will decay to be lower than 0.5V by a suitable multiple of decay network. It

will go through a AC buffer with gain value of 1, and then into a AC/DC converter or true mean square converter.

It then goes through a pre-filter, and into ADC. Under 0.5V, setting ACDIV=1 will allow the 10-times decay

signal to be 10-times amplified by AC buffer, reversing it back within the dynamic range of 0.5V before feeding it

into AC/DC converter or true mean square converter.

DC Current (DCA)