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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MCP4725 датащи(PDF) 23 Page - Microchip Technology |
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MCP4725 датащи(HTML) 23 Page - Microchip Technology |
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23 / 42 page  © 2007 Microchip Technology Inc. DS22039C-page 23 MCP4725 7.5.5 ACKNOWLEDGE Each receiving device, when addressed, is obliged to generate an acknowledge after the reception of each byte. The master device must generate an extra clock pulse which is associated with this acknowledge bit. The device that acknowledges, has to pull down the SDA line during the acknowledge clock pulse in such a way that the SDA line is stable LOW during the HIGH period of the acknowledge related clock pulse. Of course, setup and hold times must be taken into account. During reads, a master must send an end of data to the slave by not generating an acknowledge bit on the last byte that has been clocked out of the slave. In this case, the slave (MCP4725) will leave the data line HIGH to enable the master to generate the STOP condition. FIGURE 7-3: Data Transfer Sequence On The Serial Bus. SCL SDA (A) (B) (D) (D) (A) (C) START CONDITION ADDRESS OR ACKNOWLEDGE VALID DATA ALLOWED TO CHANGE STOP CONDITION |
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