Smart Module Series
SG560D_Series_Hardware_Design 44 / 134
3 Operating Characteristics
3.1. Power Supply
3.1.1. Power Supply Pins
SG560D series module provides five VBAT pins, which are dedicated for connection to external power
supply. The power supply range of the module is 3.55–4.4 V, and the recommended value is 4.0 V.
VPH_PWR is used for powering peripherals.
Table 7: VBAT Pins
3.1.2. Battery Charge and Management
SG560D series module supports fully programmable switch-mode Li-ion battery charging. It can charge
single-cell Li-ion and Li-polymer batteries. The switch-mode charging supports Quick Charge 2.0, 3.0 and
4.0, and the maximum charging current is 3.0 A. The battery charger of the module supports trickle
charging, pre-charge, constant current charging and constant voltage charging modes.
⚫ Trickle charging: when the battery voltage is below 2.1 V, a 75 mA trickle charging current is
applied to the battery.
⚫ Pre-charge: when the battery voltage is between 2.1 V and the pre-charge cut-off voltage (software
progarmmable range: 2.7–3.4 V, default value: 3.0 V), the system enters pre-charge mode. The
charging current is programmable between 100–450 mA, 300 mA by default.
⚫ Constant current mode (CC mode): when the battery voltage increases between the pre-charge
cut-off voltage and constant current charing cut-off voltage (software progarmmable range: 3.6–4.4 V,
default value: 4.4 V), the system switches to CC mode. The charging current is programmable
between 50–3000 mA. The default charging current is 500 mA for USB charging and 3 A for adapter.
⚫ Constant voltage mode (CV mode): when the battery voltage reaches the final value 4.4 V, the
system switches to CV mode and the charging current decreases gradually. When the charging
current reduces to about 100 mA, charging is completed.
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