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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC2485CDD датащи(PDF) 13 Page - Linear Technology |
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LTC2485CDD датащи(HTML) 13 Page - Linear Technology |
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13 / 40 page  13 LTC2485 2485fa APPLICATIO S I FOR ATIO Figure 2. Definition of Timing for F/S-Mode Devices on the I2C-Bus SDA SCL SSr P S tf tLOW tHD;STA tHD;STA tBUF tSP tSU;STA tSU;STO tHD;DAT tHIGH tSU;DAT tr tr tr 2485 F02 The START and STOP Conditions A START condition is generated by transitioning SDA from HIGH to LOW while SCL is HIGH. The bus is considered to be busy after the START condition. When the data transfer is finished, a STOP condition is generated by transitioning SDA from LOW to HIGH while SCL is HIGH. The bus is free again a certain time after the STOP condition. START and STOP conditions are always generated by the master. When the bus is in use, it stays busy if a repeated START (Sr) is generated instead of a STOP condition. The repeated START (Sr) conditions are functionally identical to the START (S). Data Transferring After the START condition, the I2C bus is busy and data transfer is set between a master and a slave. Data is transferred over I2C in groups of nine bits (one byte) followed by an acknowledge bit, therefore each group takes nine SCL cycles. The transmitter releases the SDA line during the acknowledge clock pulse and the receiver issues an Acknowledge (ACK) by pulling SDA LOW or leaves SDA HIGH to indicate a Not Acknowledge (NAK) condition. Change of data state can only happen while SCL is LOW. |
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