FS9721_LP1 datasheet(33/41 Pages) FORTUNE

Part #	FS9721_LP1

Description	4,000 counts auto range DMM IC

PDF	41 Pages

Scroll/Zoom	100%

Manufacturer	FORTUNE [Fortune Semiconductor Corp.]

Direct Link	https://www.ic-fortune.com/eng/index.asp

Logo

33 / 41 page

FS9721_LP1

Rev. 2.0

34/41

Capacitance measurement is to charge/discharge to measuring capacitance through R22 to

form a oscillation, then calculate the cycle of oscillation to get the capacitance value. To adjust R22

can calibrate the value in capacitance measurement. J4 and J6 are mode switches. When doing

capacitance measurement, J4 and J6 are close.

(In actual application, if the linearity is worse when doing 5.120nF measurement, you can take a

consideration of paralleling a proximate 1000pF capacitance in input end of capacitance

measurement during design. When doing the measurement, to press REL key and make the value

be zero before measuring. The linearity of the smaller measurement in capacitance mode will be

better.)

14.18 Frequency Measurement

ADP

SGND

R18

10k

R28

COM

FS9721_LP1

R30

100k

PTC

C15

10uF

Diagram 32

Frequency Measurement

14.19

Triode hFE Testing

16.5k

220k

VDDA

R30

100K

ADP

Diagram 33

PNP-type Triode

FS9721_LP1 Datasheet(PDF) 33 Page - Fortune Semiconductor Corp.