The TPS61094 supports sixteen internal setting options for charging termination voltage (VCHG), charging current (ICHG), and output voltage (OSEL) by connecting a resistor between the VCHG, ICHG, or OSEL pin and ground.

During start-up, when output voltage reaches close to input voltage, the device starts to detect the configuration conditions of the VCHG, ICHG, and OSEL pins (in that order). The TPS61094 checks the VCHG, ICHG, and OSEL pins by lowering setting options to higher setting options until the user finds the setting configuration by a 10-μs clock. After detecting the configuration, the TPS61094 latches the charging current in Buck mode, the charging termination voltage in Buck mode, and the setting output regulation voltage in Boost mode. To save detection time, TI suggests shorting the VCHG and ICHG pins to ground when Buck mode is not used.

The TPS61094 does not detect the VCHG, ICHG, and OSEL pins during operation, so changing the resistor during operation does not change the VCHG, ICHG, and OSEL settings. Toggling the EN pin during operation is one way to refresh the VCHG, ICHG, and OSEL settings.

For proper operation, TI suggests that the setting resistance accuracy must be 1% and the parasitic capacity of the VCHG, ICHG, and OSEL pins should be less than 10 pF.