P9222-R/RN Datasheet

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May 5, 2022

8.6 GPIO Pins

The P9222-R/RN has general-purpose input output (GPIO) pins for custom applications. The OD0-OD2 and GP0-GP2 pins are all multi-

functional. In addition, OD0-OD2 have an open-drained structure and GP0-GP2 have a push-pull structure.

8.6.1 OD0 Pin

The OD0 pin has a digital function open-drain structure. It is assigned to SCL of I2C function for the serial interface between the AP and the

P9222-R/RN. An external pull-up register on the SCL line is required for I2C communication. OD0 can operate up to 5V.

8.6.2 OD1 Pin

The OD1 pin has a digital function open-drain structure. It is assigned to SDA of I2C function for the serial interface between the AP and the

P9222-R/RN. An external pull-up register on the SDA line is required for I2C communication. OD1 can operate up to 5V.

8.6.3 OD2 Pin

The OD2 pin is connected to the internal ADC and can measure voltage levels smaller than 1.2V. The register address is 0xD4 with 16-bit long

data. The value is always in ADC counts and therefore must be converted to the desired units. For the conversion is:

AdcResult[0] * 2100 / 4096 = Voltage on OD2 in mV

The OD2 absolute maximum voltage rating is 2V. Care should be taken that the OD2 pin level is always below 2V. If the ADC function is not

used, this pin can be left floating.

8.6.4 GP0 Pin

The GP0 pin is connected to the internal ADC and can measure external temperature on either the receiver coil or the PCB with an external

thermistor circuit.

The P9222-R/RN sends interrupts to the AP if the temperature reaches the threshold level (0.6V default, configurable) to allow the AP an

opportunity to reduce the temperature in order to prevent power transfer interruptions.

Figure 28. GP0 Pin External Connection to Thermistor Configuration

If external temperature sensing is not used, pull this pin to 1.8V (LDO1P8) with a resistor.

8.6.5 GP1 Pin

The GP1 pin is connected to the internal ADC and can measure the voltage smaller than 1.8V. The register address is 0xD6 with 16-bit long

data. The value is always in ADC counts and therefore must be converted to the desired units. For the conversion is:

AdcResult[1] * 2100 / 4096 = Voltage on GP1 in mV