FS9952_LP1

Rev. 2.0

28/31

15.15

Open-Short Test

ONEK

SMV

AGND

_

+

RA

50k

RB

1k

R17

900k

R19

1k

PTC

J8

J6

Rx

VREF

0.4V

FS9952

V/Ohm

COM

Diagram 30

Open-Short Test

When doing the open-short test, the inner of IC will generate 0.4V voltage (relative to AGND) that is output

from R19 and is added to open-short measuring point through PTC. J6 and J8 are mode switches that are

we know that

Rx=（R19+PTC）/50

So, the resistance value of PTC will influence the upper limit of open-short test resistance. When not

connect to PTC, if R22 is 1kΩ, then the resistance of the buzzer sound is smaller than 30Ω.

15.16

AC Large Current Clamp Meter Measurement Circuit

5 SA

30 AGND

FS9952

RL

VR

R

R29

100k

Diagram 31

AC Large Current Measurement

15.17

Triode hFE Test

10

200k

VDDA

E

C

B

R30

100k

ADP

Diagram 32

PNP-type Triode