MITSUMI MM1253

Remaining Battery Power Display MM1251, MM1252, MM1253
MITSUMI
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
1.
2.
3.
4.
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)
Package
SOP-8D (MM1251AF, MM1251BF, MM1252AF, MM1252BF, MM1253AF)
Series Description
Display Pattern
Detection Precision
Normal
Low Power
MM1251
Light Off
Flashing
±30mV
MM1252
Light On
Flashing
±30mV
MM1253
Light Off
Flashing
±9mV
Absolute Maximum Ratings
(Ta=25°C)
Item
Rating
Unit
Storage temperature
-40~+125
°C
Operating temperature
-20~+70
°C
Input voltage
-0.3~+3
V
Output Terminal Applied Voltage
-0.3~+7
V
Allowable loss
300
mW
Remaining Battery Power Display MM1251, MM1252, MM1253
MITSUMI
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
VS=1.0V
Current consumption 1
ICC1
VCT=0.4V
Min. Typ. Max. Unit
MM1251
25
40
µA
MM1252A
0.15
0.25
mA
MM1252B
0.75
0.1
mA
0.15
0.25
mA
25
40
µA
0.85
0.88
V
MM1253 0.841 0.85 0.859
V
MM1253A
MM1251A
Current consumption 2
ICC2
VS=0.8V, VCT=0.4V
MM1253A
MM1251B
Detection voltage
VD
VS=1V
0.5V
VHYS <= 0.1V
MM1251
MM1252
0.82
V/ T
Detection voltage temperature factor
±200
PPM/°C
HYS pin saturation voltage 1
VHYS1
IHYS=5µA
25
50
mV
HYS pin saturation voltage 2
VHYS2
IHYS=25µA
50
100
mV
CT pin charge current
ICTS
VCT=0.1V
-60
-40
-20
nA
CT pin discharge current
ICTO
VCT=0.4V
20
40
60
nA
CT pin threshold value H
VCTH
VCT=0.1
0.4, VO <= 0.1V
0.2
0.3
0.4
V
CT pin threshold value L
VCTL
0.1
0.2
0.3
V
Output sink current
IOUT
VCT=0.4 0.1, VO >= 0.1V
VCR=0.4V
5
10
Output saturation voltage
IOUTL
VCT=0.4, IOUT=1mA
Output leak current
ILE
VS=1V, VOUT=5V
Operating limit voltage
VOPR
VS=0.8
VCCVOUT > 0.4V
VS=0.8
Step-up operation limit voltage
VOPL
VCC=0.1V
100
mA
150
mA
1
µA
Rank A
0.65
0.75
V
Rank B
0.85
0.95
V
VCC
0.5V
Voltage limit for maintaining
LED flashing
Remaining Battery Power Display MM1251, MM1252, MM1253
MITSUMI
MM1251A /MM1253A
Application Circuit
Timing Chart
VCC VD
CT
OUT
unsettled
Remaining Battery Power Display MM1251, MM1252, MM1253
MITSUMI
MM1251B
Application Circuit
Timing Chart
VCC VD
CT
OUT
unsettled
Remaining Battery Power Display MM1251, MM1252, MM1253
MITSUMI
MM1252A
Application Circuit
Timing Chart
VCC
CT
OUT
VD
unsettled
Remaining Battery Power Display MM1251, MM1252, MM1253
MITSUMI
Step-up (Rank B) Type Inductor Values
This circuit allows step-up for LED lighting even when low only. The LED repeats On/Off at high frequency,
but to the human eye it appears as if the LED is lit. Therefore, we do not recommend the use of this step-up
circuit in other circuits.
VCC
Oscillation frequency
Flash Cycle
Inductor Value-Oscillation Frequency Characteristics (reference data)
Oscillation frequency (kHz)
Flashing interval Off interval
500
300
200
100
70
50
30
VCC=0.90V
VCC=0.95V
VCC=1.00V
20
10
100
200
300
500
Inductor value (µH)
Note : The above data are reference values. Please set constants using a ±50% variance.
700 1000