Product Info

Smart Module Series
SC200R Series Hardware Design
SC200R_Series_Hardware_Design 42 / 125
3.8. Battery Charging and Management
SC200R series module supports battery charging. The battery charger in the module supports trickle
charging, constant current charging and constant voltage charging modes, which optimize the charging
procedure for Li-ion batteries.
 Trickle charging: There are two steps in this mode. When the battery voltage is below 2.8 V, a
90 mA trickle charging current is applied to the battery. When the battery voltage is charged up and is
between 2.8 V and 3.2 V, the charging current can be set to 450 mA maximally.
 Constant current mode (CC mode): When the battery is increased to between 3.2 V and 4.2 V, the
system will switch to CC mode. The maximum charging current is 1.44 A when an adapter is used for
battery charging, and the maximum charging current is 450 mA for USB charging.
 Constant voltage mode (CV mode): When the battery voltage reaches the final value 4.2 V, the
system will switch to CV mode and the charging current will decrease gradually. When the battery
level reaches 100 %, charging is completed.
Table 10: Pin Definition of Charging Interface
SC200R series module supports battery temperature detection in the condition that the battery integrates
a thermistor (47 kΩ 1 % NTC thermistor with a B-constant of 4050 K by default) and the thermistor is
connected to BAT_THERM pin. If the BAT_THERM pin is not connected, there will be malfunctions such
as battery charging failure, battery level display error, etc. The default battery temperature range is
-3.0 °C to 48.5 °C.
Pin Name Pin No. I/O Description Comment
BAT_SNS 133 AI Battery voltage detect The maximum input voltage is 4.2 V.
BAT_THERM 134 AI Battery temperature detect
Internally pulled up.
Externally connect it to the 47 kΩ
NTC thermistor.
If it is not used, connect it to GND
with a 47 kΩ resistor.
BAT_ID 185 AI Battery type detect
Internal pulled down with a 100 kΩ
resistor.
If it is not used, keep it open.
CHG_SEL 127 DI Charger select
If you use an internal charging chip,
keep this pin open.
If you use an external charging chip,
connect it to GND.