Battery Charge And Management - Quectel SC200L-EM Hardware Design

3.7. Battery Charge and Management

SC200L module can recharge batteries. The battery charger in the SC200L module supports trickle
charging, constant current charging and constant voltage charging modes.

Trickle charging:
and 2.05V, a 70mA trickle charging current is applied to the battery. When the battery voltage is
charged up and is between 2.05V and 3.05V, the charging current can be set to 450mA
maximally.
 Constant current mode (CC mode): When the battery is increased to between 3.05V and 4.18V,
the system will switch to CC mode. The charging current is 0.9A when an adapter is used for battery
charging, and the maximum charging current is 450mA for USB charging.
 Constant voltage mode (CV mode): When the battery voltage reaches the final value 4.18V, the
system will switch to CV mode and the charging current will decrease gradually. When the battery
level reaches 100%, the charging is completed.
Table 7: Description of charging interface
Pin Name Pin No.
BAT_SNS 133
CS_M 183
CS_P 184
BAT_THERM 134
BAT_ID 185
SC200L module supports battery temperature detection in the condition that the battery integrates a
thermistor (47KΩ 1% NTC thermistor with a B-constant of 3380KΩ by default; the thermistor is connected
to VBAT_THERM pin. If the VBAT_THERM pin is not connected, there will be malfunctions such as
battery charging failure, battery level display error, etc.
SC200L_Hardware_Design
There are two steps in this mode. When the battery voltage is between 1.1V
I/O Description
Battery voltage
AI
detection
Fuel gauge detection
AI
negative
Fuel gauge detection
AI
positive
Battery temperature
AI
detection
AI Battery type detection
SC200L Hardware Design
Comment
The maximum input voltage is 4.50 V.
Connect the fuel gauge to ground
when not in use.
Connect the fuel gauge to ground
when not in use.
10 kΩ NTC is supported by default,
and a 10 kΩ NTC resistor must be
connected to ground. If it is not used,
an external 10 kΩ resistor must be
connected to the ground.
Input range: 0~1.2 V, if not used, leave
it open.
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