MB3790 Ver la hoja de datos (PDF) - Fujitsu

Número de pieza

componentes Descripción

Fabricante

MB3790

Battery Backup IC

Fujitsu 

MB3790

3. Outputting Reset Signal Forcibly

The reset signal can be output forcibly by bringing the VSENSE pin of the MB3790 to a Low level (< 1.24). The reset

signal is held on until the capacitator CT is charged up after the VSENSE pin is released open.

Forced Reset Method 1

V IN

V IN

47KΩ

SW

VSENSE

CT

CT

GND

Forced Reset Method 2

SW: Turned on (VRESET = High)

V IN

V IN

Control signal

input pin

10KΩ

10KΩ

47KΩ

Q1

VSENSE

CT

CT

GND

When the voltage enough to turn on Q1 (≥ approx. 1.2 V) gives to the Control signal input pin,

VRESET is equal to High level.

[Reset Pulse Width Calculation Formula]

Reset Pulse Width tPO (sec) = CT (F) ×106 (where CT = capacitance)

Example: When CT = 1000 pF, tPO = 1 ms (Typ)

16

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