SCI7654 datasheet(6/10 Pages) EPSON

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SCI7654M0A/C0A

Function Status

Mode

POFF1

POFF2

Oscillator

Booster

Regulator

Description

PS1

H(VDD)

L(VIN)

All circuits are turned ON.

PS2

OFF

OFF (*1)

OFF (*2)

All circuits are turned OFF.

PS3

OFF

Slave side (booster and regulator)

in parallel connection

Master side (for booster only)

PS4

OFF

in parallel connection; first stage

in serial connection (*3)

*1 When the booster circuit is OFF, approximately VIN +0.6V voltage appears at VOUT pin.

*2 When the regulator is OFF, the VREG pin is set to the high-impedance status.

*3 The mode selected depends on the line connection at the second stage of serial connection.

Voltage Regulator Circuit

The circuit receives a voltage from VRI pin, stabilizes it, and outputs at any voltage. The output is adjustable with

a ratio of R1 and R2 external divider resistors. Although the sum of divider resistors is desirable to be minimum

to prevent an interference due to external noise, 100 to 1 megohms are recommended as the current

consumption may be increased by the divider resistors.

Power Off Control

The SCI7654 has an automatic power-off function, and can turn on or off each function depending on the external

signals entered in POFF1 and POFF2 pins.

VOUT

VRI

VREG

VDD

TC1

TC2

C2P

C2N

C3N

C1N

C1P

VIN

POFF1

POFF2

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