TCA9539: Interface TCA9539 with ESP32 MCU and IWR6843 mmWave Sensor

Srikanth,

You've correctly identified the device's address, assuming you've pulled A1 and A0 to be 0:

1   1   1   0   1   A1   A0

I am assuming you're asking for the register addresses that would go in the Control Register. Table 3 in the TCA9539 datasheet shows a breakdown of the control register values to access the Input Port Registers, Output Port Registers, Polarity Inversion Registers, and Configuration Registers.

In order to set particular Px pins as outputs, you'll need to set the corresponding value in the Configuration Register to 0. By default, the bits are set to 1 as all ports are defaulted to inputs. The Configuration Register for P0, which includes P04, P05, and P06, is 0x06, or 00000110₂.

After setting these pins as outputs, you'll need to set their output value using the Output Port Registers. By default, the bits are set to 1, representing logic high. the Output Port Register for P0, which includes P04, P05, and P06, is 0x02, or 00000010₂.

Best,

Danny