S8425 datasheet(29/45 Pages) SII

29 / 45 page

BATTERY BACKUP SWITCHING IC

Rev.3.1_01

S-8425 Series



Precautions

• In applications in which any one of IRO, IOUT, or ICH is small, the output voltages VRO, VOUT, and VCH may

rise, causing the load stability to exceed standard levels. Set IRO, IOUT, or ICH to 10

μA or more.

• Attach the proper capacitor to the VOUT pin to prevent the RESET voltage detector (which monitors the

VOUT pin) from becoming active due to undershoot.

• Watch for overshoot and ensure it does not exceed the ratings of the IC chips and/or capacitors

attached to the VRO, VOUT, and VCH pins.

• Add a 10 μF or more capacitor to the VOUT, VRO, and VCH pins.

• Do not apply an electrostatic discharge to this IC that exceeds the performance ratings of the built-in

electrostatic protection circuit.

• SII Semiconductor Corporation claims no responsibility for any and all disputes arising out of or in

connection with any infringement by products including this IC of patents owned by a third party.



Application Circuit

When Using Secondary Battery as Backup Battery

VCH

μF

RESET

VSS

6 V

VIN

VBAT

VRO

S-8425

Series

3 V

0.1

μF

VCC

INT

Microcontroller

μF

100 k

RESET

VOUT

μF

Caution

The above connection diagram and constant will not guarantee successful

operation. Perform thorough evaluation using the actual application to set the

constant.

Remark

The backup battery can be floating-recharged by using voltage regulator 3.

Figure 26 Application Circuit

S8425 Datasheet(PDF) 29 Page - Seiko Instruments Inc

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