MB3790 Fujitsu Media Devices, MB3790 Datasheet - Page 4

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

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DataSheet
4
4
MB3790
U
13, 14
.com
16P
3, 4
PIN DESCRIPTION
Pin number
10
11
12
15
16
—
—
1
2
5
6
7
8
9
14, 15
17, 18
20P
3, 4
6, 7
10
11
12
13
16
19
20
1
2
5
8
9
CONTROL
ALARM1
ALARM2
Symbol
RESET
RESET
V
GND
V
N.C.
V
N.C.
N.C.
N.C.
V
SENSE
V
C
BAT2
BATI
OUT
IN
T
I/O
I/O
—
—
—
—
—
—
O
O
O
O
O
I
I
I
I
Non connection
This pin connects to the primary battery.
These pins supply the output voltage. (Range of output current value
I
This pin connects to the secondary battery. When the power supply
voltage is greater than or equal to the detection level (i.e., V
secondary battery is recharged using the constant-voltage method of
charging.
Non connection
This is an open-collector output pin for a primary battery alarm
signal. When the power supply voltage is greater than or equal to
V
voltage is less than V
voltage. If V
forced to a Low level.
This is an open-collector output pin for a primary battery alarm
signal. When the power supply voltage is greater than or equal to
V
voltage is less than V
voltage. If V
forced to a Low level.
This pin connects to the ground (0 V).
This pin outputs a reset signal. When the power supply voltage is
less than or equal to V
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.
This pin outputs an inverted signal of RESET.
This pin is used to set the reset pulse width.
Insert a capacitor between this pin and GND to set the pulse width.
Non connection
This pin accepts comparator input for detecting the power supply
voltage level. For details, refer to APPLICATION in this data sheet.
These pins accept the input voltage for the device.
Non connection
This pin is used for output control. For details, refer to APPLICATION
in this data sheet.
OUT
INH
INH
, it monitors the primary battery voltage. If the power supply
, it monitors the primary battery voltage. If the power supply
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200 mA)
BAT1
BAT1
is less than or equal to 2.65 V, its output voltage is
is less than or equal to 2.37 V, its output voltage is
INL
INL
INL
, it does not monitor the primary battery
, it does not monitor the primary battery
Name and function
, it outputs a High level.
INH
), the