4

MB3790

s PIN DESCRIPTION

Pin number

Symbol

I/O

Name and function

16P

20P

1

1

N.C.

—

Non connection

22

I

This pin connects to the primary battery.

3, 4

3, 4

O

These pins supply the output voltage. (Range of output current value

≤ 200 mA)

55

I/O

This pin connects to the secondary battery. When the power supply

secondary battery is recharged using the constant-voltage method of

charging.

—

6, 7

N.C.

—

Non connection

6

8

ALARM1

O

This is an open-collector output pin for a primary battery alarm

signal. When the power supply voltage is greater than or equal to

forced to a Low level.

7

9

ALARM2

O

This is an open-collector output pin for a primary battery alarm

signal. When the power supply voltage is greater than or equal to

forced to a Low level.

8

10

GND

—

This pin connects to the ground (0 V).

9

11

RESET

O

This pin outputs a reset signal. When the power supply voltage is

If the power supply voltage of SRAM is less than the designated

range, it directly controls the CE or CS of SRAM to disable writes and

thereby protect the data in memory.

10

12

RESET

O

This pin outputs an inverted signal of RESET.

11

13

—

This pin is used to set the reset pulse width.

Insert a capacitor between this pin and GND to set the pulse width.

—

14, 15

N.C.

—

Non connection

12

16

I

This pin accepts comparator input for detecting the power supply

voltage level. For details, refer to APPLICATION in this data sheet.

13, 14

17, 18

I

These pins accept the input voltage for the device.

15

19

N.C.

—

Non connection

16

20

CONTROL

I

This pin is used for output control. For details, refer to APPLICATION

in this data sheet.