FS9922-DMM4-DS-11 データシートの表示（PDF） - Unspecified

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FS9922-DMM4-DS-11

Integrated Circuits of 6,000 Counts Auto-ranging Digital Multimeter with Bar Graph

Unspecified 

FS9922-DMM4

double of VDD.

VDDA is the output voltage after the regulation of VGG in the IC. It is about 3.9V relative to VSS.

REFO is the bandgap power source in the IC. It is about 1.2V relative to AGND and has the stability of 100ppm/

℃.

2*VDD

3.9V

VDDA/2 1.2V

3V 3V

0.63V

VDDA/2

VGG

VDDA

RLCD

VDD

REFO

REFI

AGND

VSS

FS9922-DMM4

Diagram 5: Relative Voltage at each Point

SW

BT

C2

VDD

3V

1uF

AGND

C3

10uF

VSS

FS9922-DMM4

Diagram 6: Power Supply ON/OFF Circuit

Note: In order to avoid “hang up” when FS9922-DMM4 is power-on and off fast, SW should

be connected to VSS.

12.4 Power Supply Circuit

The different applications of users make different power supply methods. In some measurements, the sensor

requires higher voltage such as OPAMP, Hall device and so on. If it is difficult to supply the power by 3V, then

you can take some power supply methods as below.

VDD

1uF

3V

AGND

10uF

VSS

FS9922-DMM4

Diagram 7: 3V Power Supply

Rev. 1.1

17/39

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