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TCN75AVOA датащи(PDF) 12 Page - Microchip Technology |
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TCN75AVOA датащи(HTML) 12 Page - Microchip Technology |
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12 / 40 page ![]() TCN75A DS21935D-page 12 2010 Microchip Technology Inc. FIGURE 4-1: Device Addressing. 4.1.5 DATA VALID After the Start condition, each bit of data in transmission needs to be settled for a time specified by tSU-DATA before SCL toggles from low-to-high (see “Serial Interface Timing Specifications (Note 1)” . 4.1.6 ACKNOWLEDGE (ACK) Each receiving device, when addressed, is obliged to generate an ACK bit after the reception of each byte. The master device must generate an extra clock pulse for ACK to be recognized. The acknowledging device pulls down the SDA line for tSU-DATA before the low-to-high transition of SCL from the master. SDA also needs to remain pulled down for tH-DATA after a high-to-low transition of SCL. During read, the master must signal an End-of-Data (EOD) to the slave by not generating an ACK bit (NAK) once the last bit has been clocked out of the slave. In this case, the slave will leave the data line released to enable the master to generate the Stop condition. 1 2345 67 8 9 SCL SDA 10 0 1 A2 A1 A0 Start Address Byte Slave Address R/W TCN75A Response Code Address A C K |
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