Addressing - GMP231

GMP231 uses 7-bit addressing. The address consists of:

• 4-bit device type identifier part (default “0001” for GMP231)
• 3-bit sub address (default “001”)

The full 7-bit default address is “0001001” (09_hex). In I²C communication, the address should be provided by the master in the standard way after the I²C start condition, with the read/write bit as the least significant bit (LSB).

Table 1. GMP231 I²C Address

0	0	0	1	0	0	1	R/W
Device type				Sub-address			Read/write bit (LSB)

The I²C implementation of the GMP231 also includes the address inside the message frame. The purpose of this is to make the I²C implementation easier, since the I²C address can be lost by the I²C hardware. This address is provided without the read/write bit, with zero as the MSB.

Table 2. GMP231 Device Address

0	0	0	0	1	0	0	1
MSB	Device type				Sub-address