The internal charging scheme we use. Actual testing of SF32LB52UC6 shows that the transition voltage from trickle charge to constant current charge is around 3.55V. The battery voltage VCC=VBAT needs to be about 3.6V for normal power-on.
The introduction says the defaults are:
VCC input voltage range: 3.2V~4.7V
Charger default trickle-to-constant current transition voltage value is 3.0V
May I ask if it is possible to set the trickle-to-constant current transition voltage value and the power-on voltage?
The default transition voltage from trickle charge to constant current is 3.0V.
The default trickle charge current is 56mA.
These two parameters are fixed at the chip factory and cannot be modified.
Only the constant current charging current and the full charge voltage can be modified.
The battery voltage VCC=VBAT needs to be approximately 3.6V for normal startup:
Check your code to see if there is voltage detection that requires 3.6V before software startup is executed.
Normally, above 3.2V, the MCU hardware starts up, and there will be an SFBL printout. After startup, everything is software-driven.
The internal charging does not have path management. At 3.2V, the current is configured to be small. This can cause repeated restarts, as both current and voltage are insufficient.
Normally, battery voltage detection is added in the logic, and startup initialization and screen activation only proceed after charging to above 3.6V.