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RF Introduction to TMS37157 PaLFI Slide 8

The Battery Charge command is used to power the connected microcontroller without a battery. This command can also be used to charge an attached system battery. When a Battery Charge command has been received, the TMS37157 applies a voltage of 3.4V to the VBAT pin. The charge current depends mainly on the antenna of the LC tank circuit and the field strength of the base station.

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