The following application example uses nPM1300 and an nRF5x Bluetooth® Low Energy System on Chip (SoC). For other configurations, see Reference circuitry.
An application must not be supplied directly from VBAT. This can interrupt the battery charging process causing unwanted behavior from the charger. Use either VOUT1, VOUT2, or VSYS to supply the application.
BUCK1 starts automatically and supplies the nRF5x host SoC with 1.8 V. BUCK1 is the I/O voltage for the system. BUCK2 starts automatically with 3 V output voltage for other application features.
nRF5x can connect to a USB host.
Three LEDs can be used for charging indicators or general purpose by the application.
The termination voltage, VTERM, is configured through TWI up to 4.45 V.
Charge current is configured through TWI.
The NTC pin connects to an external NTC thermistor. Place the NTC thermistor with thermal coupling on the battery pack.
Ship mode is enabled at production time through the TWI interface.
SHPHLD is connected to SW2 and is in the circuit to exit Ship mode. If another circuit is present instead of a button, any signal that is able to pull the SHPHLD pin low for the required period can be connected to that net. See Ship and Hibernate modes for more information.