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PCA9560PW Datasheet(PDF) 4 Page - NXP Semiconductors |
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PCA9560PW Datasheet(HTML) 4 Page - NXP Semiconductors |
4 / 17 page Philips Semiconductors Product data PCA9560 Dual 5-bit multiplexed 1-bit latched I2C EEPROM DIP switch 2003 Jun 27 4 DEVICE ADDRESS Following a START condition the bus master must output the address of the slave it is accessing. The address of the PCA9560 is shown in Figure 3. To conserve power, no internal pull-up resistors are incorporated on the hardware selectable address pins and they must be pulled HIGH or LOW. The last bit of the slave address byte defines the operation to be performed. When set to logic 1 a read is selected while a logic 0 selects a write operation. 0 0 1 A1 A0 R/W 11 SW00955 MSB LSB FIXED HARDWARE SELECTABLE Figure 3. Slave address CONTROL REGISTER Following the successful acknowledgement of the slave address, the bus master will send a byte to the PCA9560, which will be stored in the control register. This register can be written and read via the I2C bus. D6 D5 D4 D2 D1 D0 D7 D3 SW00954 Figure 4. Control Register CONTROL REGISTER DEFINITION Following the address and acknowledge bit with logic 0 in the read/write bit, the first byte written is the command byte. If the command byte is reserved and therefore not valid, it will not be acknowledged. Only valid command bytes will be acknowledged. Table 1. Register Addresses D7 D6 D5 D4 D3 D2 D1 D0 REGISTER NAME TYPE REGISTER FUNCTION 0 0 0 0 0 0 0 0 EEPROM 0 Read/Write EEPROM byte 0 register 0 0 0 0 0 0 0 1 EEPROM 1 Read/Write EEPROM byte 1 register 1 1 1 1 1 1 1 1 MUX_IN Read MUX_IN values register Table 2. Commands D7 D6 D5 D4 D3 D2 D1 D0 COMMAND 1 1 1 1 1 0 0 0 MUX_OUT from EEPROM byte 0 1 1 1 1 1 1 0 0 MUX_OUT from EEPROM byte 1 1 1 1 1 1 X 1 0 MUX_OUT from MUX_IN 1 1 1 1 1 X X 1 MUX_OUT from MUX_SELECT2 NOTE: 1. All other combinations are reserved. 2. MUX_SELECT pins select between MUX_IN and EEPROM to MUX_OUT. |
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