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DLVR-L30D Fiches technique(PDF) 8 Page - All Sensors Corporation |
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DLVR-L30D Fiches technique(HTML) 8 Page - All Sensors Corporation |
8 / 18 page I2C Communications Overview (Cont’d) Figure 3 - I2C Communication Diagram Figure 3 illustrates the sequence of signals set by both the host and the sensor for each command. Note that for the Da- taRead command, the host has the option of responding to the second or third bytes of data with a NACK instead of ACK. This terminates the data transmission after the pressure data, or after the pressure data and upper byte of temperature, have been transmitted. See Figure 6 for the I2C timing details. 1. Start All ( to wake sensor from Sleep mode, Zero ADC, read Temperature and read Pressure ) Set by bus master: - - - - I ST A6 A5 A4 A3 A2 A1 A0 R SP I Set by sensor: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - A 2. Start Pressure ( to wake sensor from Sleep mode and read Pressure only ) Set by bus master: - - - - I ST A6 A5 A4 A3 A2 A1 A0 W SP I Set by sensor: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - A 3. Read Data ( with examples of reading pressure, pressure plus 8 bits of temperature and pressure plus 12 bits of temperature ) Set by bus master: - - - - I ST A6 A5 A4 A3 A2 A1 A0 R A Set by sensor ( pressure plus status ): - - - - - - - - - - - - - - - - - - - - A D31 … D24 D23 … D16 …then, one of the following: a) Set by bus master, to stop transfer after pressure data received: - - - - - - - - - - - - - - - - - - - - - - - - N SP I --OR-- b) Set by bus master, to stop transfer after first temperature data byte received: - - - - - - - - - - - - - - A N SP I Set by sensor ( high order 8 bits of temperature ): - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - D15 … D8 --OR-- c) Set by bus master, to stop transfer after last temperature data byte received: - - - - - - - - - - - - - - A A N SP I Set by sensor ( all 12 bits of temperature plus padding bits ): - - - - - - - - - - - - - - - - - - - - - - - - - - - D15 … D8 D7 … D0 Bus states Sensor Address Data format Idle: I A6 … A0 Status: D31 D30 Start: ST Default: 0x28 Pressure data: D29 … D16 Stop: SP Temperature data: D15 … D5 Ack: A (padding bits:) D4 … D0 Nack: N “Read” bit (1): R “Write” bit (0): W Page 8 |
Numéro de pièce similaire - DLVR-L30D |
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Description similaire - DLVR-L30D |
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