The TPS544C26 device offers selectable 7-bit I²C address either through a resistor from the I²C_ADDR pin (pin 29) to AGND, or programmable by writing an 7-bit address value into the (A2h) I²C_ADDR register.

As the default configuration, a resistor from the I²C_ADDR pin (pin 29) to AGND sets the pre-configured 7-bit I²C address (0x70 to 0x7F) in the memory map. Up to 16 different addresses can be set, allowing 16 devices with unique addresses in a single system. TI recommends ±1% tolerance resistors with a typical temperature coefficient of ±100 ppm/°C

As an alternative method, the I²C address of a TPS544C26 device can be programmed by writing an address value into (A2h) I2C_ADDR register. This register supports the full range from 00h to 7Fh (7-bit, ‘0000000’ to ‘1111111’). And, an override bit has to be set to ‘1’ so that TPS544C26 device ignores the pin 29 detection and straightly go to (A2h) I²C_ADDR register for I²C address. This method allows much more flexibility on the address selections. This override bit locates in (A0h) SYS_CFG_USER1 register bit[0].

For the programmed address to take effect, below actions have to be taken:

1. Write the desired I²C address value to bit[6:0] in the (A2h) I2C_ADDR register.
2. Set the OVRD_I2C_ADDR bit in the (A0h) SYS_CFG_USER1 register.
3. Store the new values to EEPROM by writing "1" to bit[0] in (15h) STORE_USER_ALL register. The whole store process takes 150 ms to finish.
4. Wait sufficient time for the store action to finish. Power cycle the device. During the power-on, the address programmed to the (A2h) I2C_ADDR register takes effect.

For example, using 9.53 kΩ selects 1110010b (72h) as the 7-bit I²C address. Then the 8-bit I²C address is 11100100b (E4h), which is the 7-bit address followed by the write bit 0b.