P9222-R/RN Datasheet

© 2019-2022 Renesas Electronics Corporation

38

May 5, 2022

9.1.2 VOUT Configuration Change Using an External EEPROM

The default output voltage can be configured by writing a configuration file into the external EEPROM. The configuration file can be generated

using the P9222-R/RN Windows GUI. To generate a new configuration file using the P9222-R/RN Windows GUI:

1. Place receiver with the P9222-R/RN on the WPC transmitter or apply 5V from an external power supply on VRECT node.

2. Launch the P9222-R/RN GUI, go to the “Config” tab, and then click on the “Rd EEPROM” button. The current EEPROM configuration

values will be displayed.

3. Enter a new VOUT value and generate a new configuration by clicking on “Save cfg file”.

4. The Configuration can also be directly written to the external EEPROM by clicking “Wr EEPROM”. Write Protect on the EEPROM needs

to be disabled before writing to the EEPROM.

5. After saving the new configuration into the EEPROM, the P9222-R/RN must be power cycled for the output voltage to change to the new

value.

Figure 33. Changing the Default VOUT Value using the P9222-R/RN Windows GUI

9.2

Current Limit (ILIM) Configuration

The current limit threshold value is used to limit the output current of main LDO on the VOUT pin. If the output current reaches the target limit

value, the P9222-R/RN will reduce the output voltage without increasing current. The default ILIM value of the P9222-R/RN is 1.6A. The user

can change the default current limit value in accordance with specific user design requirements and store the modified configuration into an

external EEPROM. In addition, after the P9222-R/RN enters the power transfer phase, an external AP can adjust the ILIM value by writing to

the ILIM_Set register (0x3D) via the I2C interface. The P9222-R/RN firmware reads the internal register value in regular time base and updates

the current limit value. The current limit can be incremented in steps of 100mA.

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Equation 5

The default Current Limit value can be configured by writing a configuration file into the external EEPROM. The configuration file can be

generated using the P9222-R/RN Windows GUI. For information on how the configuration file can be generated using the P9222-R/RN Windows

GUI, see “VOUT Configuration Change Using an External EEPROM.”