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TCA6416AZQSR Datasheet(PDF) 6 Page - Texas Instruments |
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TCA6416AZQSR Datasheet(HTML) 6 Page - Texas Instruments |
6 / 34 page SDA SCL S P StartCondition StopCondition SDA SCL DataLine Change S 1 2 8 9 NACK ACK DataOutput byTransmitter DataOutput byReceiver SCL From Master Start Condition ClockPulsefor Acknowledgment TCA6416A SCPS194A – MAY 2009 – REVISED NOVEMBER 2009 www.ti.com A Stop condition, a low-to-high transition on the SDA input/output while the SCL input is high, is sent by the master (see Figure 1). Any number of data bytes can be transferred from the transmitter to receiver between the Start and the Stop conditions. Each byte of eight bits is followed by one ACK bit. The transmitter must release the SDA line before the receiver can send an ACK bit. The device that acknowledges must pull down the SDA line during the ACK clock pulse, so that the SDA line is stable low during the high pulse of the ACK-related clock period (see Figure 3). When a slave receiver is addressed, it must generate an ACK after each byte is received. Similarly, the master must generate an ACK after each byte that it receives from the slave transmitter. Setup and hold times must be met to ensure proper operation. A master receiver signals an end of data to the slave 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. Figure 1. Definition of Start and Stop Conditions Figure 2. Bit Transfer Figure 3. Acknowledgment on the I2C Bus 6 Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated Product Folder Link(s): TCA6416A |
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