PST620DDB データシートの表示（PDF） - Mitsumi

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PST620DDB

System Reset (with battery back-up) Monolithic IC

Mitsumi 

MITSUMI

System Reset (with battery back-up) PST620, 621

Timing Chart

PST620

VCC1

4.2V

VCC2

2.15V

CE

TC

Delay

Delay

RE

AC power supply

Note : Connect VAC pin to VCC when not using.

AC rectifier or

regulator

primary side

VTX

CE

Note 1: VTH is set at 2.0V and hysteresis voltage at 90mV.

1. Use a resistor to divide the detected voltage so that it equals VTH when monitoring regulator

primary side power supply.

2. When monitoring AC voltage rectified as in the application circuit, set so that it equals VTH by

lowering the constant and dividing with a resistor. Refer to application circuit diagram.

Note 2: VAC input and VS1 are OR, so either signal makes CE low when power outage is detected.

PST621

AC

VCC1 4.2V

CE

MODE

VCC2 3.1V

RESET

Application Circuits

VAC input : Power supply transformer secondary voltage detection

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