Outline
MM8118G is a high accuracy battery monitoring IC for Li-ion battery and Li-polymer battery.
This IC measures temperature, voltage, and current with high-precision delta-sigma AD converter, integrates current value both at discharging and charging, and performs capacitance correction based on the measurement value and specific battery characteristics parameter. Thus the IC achieves excellent management ability for battery power.
MM8118G provides several features to make battery use safe and secure. Battery degradation detection which is based on capacitance change is available. And this IC has features for notification of these information.
MM8118G can be implemented at both of host-side and battery-side.
Functuion
Coulomb Counting type
Features
・High accuracy current/voltage measurement
Current and voltage value are measured by high accuracy 16bit delta-sigma AD converter.
・High accuracy battery power management
Battery power is based on integration of periodically-measured current and the value is corrected with open voltage(OCV) and battery characteristics parameters. The battery power is managed so as to minimize the error constantly.
・Battery degradation monitor
Battery total capacitance is measured periodically and status of capacitance change is monitored.
Specifiction
| Operating temperature [deg.C] |
-20 to 85 |
|---|---|
| Operation voltage [V] |
2.5 to 5.5 |
| Current consumption [μA] |
30.5(Normal mode) |
| Voltage sensing accuracy [mV] |
1800 to 5000 |
| Current sensing accuracy [mV] |
-48 to 48 |
| Temperature sensing accuracy [deg.C] |
-20 to 85 |
| Communication I/F | I2C(Max 400kHz) |
