MB3790 Fujitsu Media Devices, MB3790 Datasheet - Page 17

• Manufacturer Part Number: MB3790
• Description: Battery Backup IC
• Manufacturer: Fujitsu Media Devices

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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 s or
more. The set time before this reset signal is output can be extended by connecting a capacitor to the V
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.
V
U
BAT1
Pin Name
.com
Adjusting the Supply Voltage Detection Level Set Time
• Alarm Pin Detection Voltage Levels
ALM1
ALM2
: Primary battery voltage
5V
4V
V
BAT1
Low level
Low level
t
PI
2.37 V
2.37 V < V
V
IN
High level
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Low level
C
BAT1
2.65V
V
V
SENSE
IN
2.65 V
High level
High level
V
BAT1
GND
Connected Pin
MB3790
BVD2
BVD1
SENSE
pin.
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