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XRA1207IG24-F Datasheet(PDF) 5 Page - Exar Corporation |
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XRA1207IG24-F Datasheet(HTML) 5 Page - Exar Corporation |
5 / 17 page XRA1207 5 REV. 1.0.0 16-BIT I2C/SMBUS GPIO EXPANDER WITH INTEGRATED LEVEL SHIFTERS 1.1.1 I2C-bus Addressing There could be many devices on the I2C-bus. To distinguish itself from the other devices on the I2C-bus, the XRA1207 has up to 4 I2C slave addresses using the A0 address line. Table 1 below shows the different addresses that can be selected. TABLE 1: I C ADDRESS MAP C ADDRESS GND 0x40 (0100 000X) VCC 0x42 (0100 001X) SCL 0x50 (0101 000X) SDA 0x52 (0101 001X) 1.1.2 I2C Read and Write A read or write transaction is determined by bit-0 of the slave address. If bit-0 is ’0’, then it is a write transaction. If bit-0 is ’1’, then it is a read transaction. 2 A0 I2 |
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