MITSUMI
Remaining Battery Power Display MM1251, MM1252, MM1253
Remaining Battery Power Display
Monolithic IC MM1251, MM1252, MM1253
Outline
This IC detects battery voltage and displays the power remaining in the battery. Display of the battery's
remaining power is an indispensable function for portable equipment. The use of this IC makes this display
easily achievable.
The usual method of display of remaining battery power, as in the MM1206, is three marks lighting up in
sequence on an LED or other display. This IC, however, uses only one light to display the remaining battery
power, resulting in lower cost.
Features
Adjustable flashing speed
Adjustable detection voltage supports all settings
Adjustable hysteresis voltage enables response to large ripple settings
High precision voltage detection (MM1253) enables support of sets using nickel cadmium and other
batteries
5. The LED can be lit up by the voltage from one battery (type of special built-in step-up circuit : rank B)
1.
2.
3.
4.
Package
SOP-8D (MM1251AF, MM1251BF, MM1252AF, MM1252BF, MM1253AF)
Series Description
Display Pattern
Detection Precision
Normal
MM1251
MM1252
MM1253
Light Off
Light On
Light Off
Low Power
Flashing
Flashing
Flashing
±30mV
±30mV
±9mV
Absolute Maximum Ratings
Item
Storage temperature
Operating temperature
Input voltage
(Ta=25°C)
Rating
-40~+125
-20~+70
-0.3~+3
-0.3~+7
300
Unit
°C
°C
V
V
mW
Output Terminal Applied Voltage
Allowable loss
MITSUMI
Remaining Battery Power Display MM1251, MM1252, MM1253
Electrical Characteristics
Item
(Unless otherwise specified Ta=25°C, Vc=1.5V, Vs=0.8V)
(Applicable to all models when the model name is left blank.)
Symbol
Measurement Conditions
V
S
=1.0V
MM1251
MM1253A
MM1252A
MM1252B
MM1251A
MM1253A
MM1251B
VD
V
S
=1V
0.5V
MM1251
MM1252
0.82
Min. Typ. Max. Unit
25
0.15
0.75
0.15
25
0.85
40
0.25
0.1
0.25
40
0.88
µA
mA
mA
mA
µA
V
V
PPM/°C
50
100
-20
60
0.4
0.3
150
1
Rank A
0.65
0.75
mV
mV
nA
nA
V
V
mA
mA
µA
V
Current consumption 1
I
CC
1
V
CT
=0.4V
Current consumption 2
I
CC
2
V
S
=0.8V, V
CT
=0.4V
Detection voltage
V
HYS
< 0.1V
=
V/ T
MM1253 0.841 0.85 0.859
±200
25
50
-60
20
0.2
0.1
5
-40
40
0.3
0.2
10
100
Detection voltage temperature factor
HYS pin saturation voltage 1
HYS pin saturation voltage 2
C
T
pin charge current
C
T
pin discharge current
C
T
pin threshold value H
C
T
pin threshold value L
Output sink current
Output saturation voltage
Output leak current
Operating limit voltage
V
HYS
1
V
HYS
2
I
CTS
I
CTO
V
CTH
V
CTL
I
OUT
I
OUT
L
I
LE
V
OPR
I
HYS
=5µA
I
HYS
=25µA
V
CT
=0.1V
V
CT
=0.4V
V
CT
=0.1
V
CT
=0.4
0.4, V
O
< 0.1V
=
0.1, V
O
> 0.1V
=
V
CR
=0.4V
V
CT
=0.4, I
OUT
=1mA
V
S
=1V, V
OUT
=5V
V
S
=0.8
V
CC
V
OUT
> 0.4V
V
CC
0.5V
Rank B
V
S
=0.8
Step-up operation limit voltage
V
OPL
V
CC
=0.1V
Voltage limit for maintaining
LED flashing
0.85
0.95
V
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