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PCA9545ADW Datasheet(PDF) 9 Page - Texas Instruments |
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PCA9545ADW Datasheet(HTML) 9 Page - Texas Instruments |
9 / 28 page www.ti.com Data Output by Transmitter SCL From Master Start Condition S 1 2 8 9 Data Output by Receiver Clock Pulse for ACK NACK ACK A A S 1 1 1 0 0 A1 A0 0 Start Condition SDA R/W ACK From Slave ACK From Slave P B0 B1 B2 B3 X X X X Stop Condition Slave Address Control Register A NA S 1 1 1 0 0 A1 A0 1 SDA INT0 INT3 INT2 INT1 P B3 B2 B1 B0 Start Condition R/W ACK From Slave NACK From Master Stop Condition Slave Address Control Register PCA9545A 4-CHANNEL I2C AND SMBus SWITCH WITH INTERRUPT LOGIC AND RESET FUNCTIONS SCPS147C – OCTOBER 2005 – REVISED OCTOBER 2006 Figure 7. Acknowledgment on the I2C Bus A master receiver must signal an end of data to the transmitter by not generating an acknowledge (NACK) after the last byte has been clocked out of the slave. This is done by the master receiver by holding the SDA line high. In this event, the transmitter must release the data line to enable the master to generate a stop condition. Data is transmitted to the PCA9545A control register using the write mode shown in Figure 8. Figure 8. Write Control Register Data is read from the PCA9545A control register using the read mode shown in Figure 9. Figure 9. Read Control Register 9 Submit Documentation Feedback |
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