FS970X datasheet(43/46 Pages) FORTUNE

43 / 46 page

FS970X

Rev. 4.4

43/46

Capacitor

ON CHIP

OFF CHIP

COMMON

XOHM

10M

 or 1M or 100K or 10K or 1K

PTC

FUSE

VOLT+OHM+

DT+CAP

OSR

AGND

XOHM<1>

909K



SMV

DCmV+OHM+CAP

+DT+HFE+PKH

DCV+OHM

+CAP+HFE+PKH

OSRC

OSREN

OSRC

CMP1

CMPEN1

CMPL

CAPTG

XOHM<2>

CMPH

18~22

Graph 24. Function network diagram of capacitor.

Address

RDG

SIN

SRF

SCP

AFT

ADG

SETADC MISC1 MISC2

Value

1Bh

00h

01h

00h

Chart 31. Capacitor register setup.

Address

500nF

5uF

50uF

500uF

RGD<7:0>

1Bh

2Bh

4Bh

8Bh

AFT<7:0>

00h

04h

MISC1<7:0>

00h

20h

Chart 32. Capacitor range setup.



Measuring capacitor value of FS9704B is to charge and discharge the resistor reference added by

XOHM Pin to make an oscillation, and then calculate its oscillated cycle to get the capacitor value.

Title

Num ber

Revision

Size

Date:

4-Dec-2001

Sheet

File:

C:\Program Files\Design Explorer 99 SE\Exam ples\DDM9711.ddb

Drawn By :

3/4VDD

1/4VDD

VDD

Tdo

Capacitor Measurement



To calculate the cycle, we send the square wave that out from CAPTG to the frequency counter. When

operating the frequency measurement, the necessary timer reference signal is FTB. For the measuring

frequency, it can be gained through the following formula. In this formula, Ksg is the signal counter and

Ktb is the value of the time-base counter.

Fin = (Ksg / Ktb) * FTB



The revise of the calculated Fin is the cycle.

1 / Fin = { 1 / [ (Ksg / Ktb) * FTB ] }

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