Hi,
Default value for RTC charger is 3,0(2.5V,2.1Kohm).
AT!MVCOIN : sets or queries the Coin cell configuration.The command specifies the voltage of the coin cell as well as the series resistance of the resistor in use.
The setting is persistent across power cycles.
Command Syntax: AT!MVCOIN=voltage,resistance
Query Syntax: AT!MVCOIN?
Response Syntax: !MVCOIN: voltage,resistance
0-3 0 - 3.0V
1 - 3.1V
2 - 3.2V
3 - 2.5V
0-3 0 - 2100 OHMS
1 - 1700 OHMS
2 - 1200 OHMS
3 - 800 OHMS.
Regards,
Moderator