MB3790 데이터 시트보기 (PDF) - Fujitsu

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MB3790

Battery Backup IC

Fujitsu 

MB3790

4. Adjusting the Supply Voltage Detection Level Set time

The MB3790 outputs a reset signal when the power supply momentarily goes down or its voltage sags for 5 µs or

more. The set time before this reset signal is output can be extended by connecting a capacitor to the VSENSE pin.

Adjusting the Supply Voltage Detection Level Set Time

5V

4V

t PI

V IN

C

V IN

VSENSE

GND

5. Compatibility with JEIDA Memory Card Guideline Ver. 4

The MB3790 has its ALM1 and ALM2 pin specifications matched to the BVD2 and BVD1 pin specifications of the

JEIDA Memory Card Guideline Ver. 4. Therefore, the ALM1 and ALM2 pins can be connected directly to the BVD2

and BVD1 pins.

• Alarm Pin Detection Voltage Levels

Pin Name

ALM1

ALM2

VBAT1 ≤ 2.37 V

Low level

Low level

2.37 V < VBAT1 ≤ 2.65V

Low level

High level

2.65 V ≤ VBAT1

High level

High level

Connected Pin

BVD2

BVD1

VBAT1: Primary battery voltage

17

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