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DLH-L05D-E1BD-C-NAV8 Datasheet(PDF) 8 Page - All Sensors Corporation |
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DLH-L05D-E1BD-C-NAV8 Datasheet(HTML) 8 Page - All Sensors Corporation |
8 / 16 page DLH Series Low Voltage Digital Pressure Sensors SPI Interface SPI Command Sequence As with the I2C interface configuration, the part enters Idle state after power-up, and waits for a command from the SPI master. To start a measurement cycle, one of the 3- byte Measurement Commands (see Table 1) must be issued by the master. The data returned by the sensor during this command request consists of the Status Byte followed by two undefined data bytes. On successful decode of the command, the EOC pin is set Low as the core goes into Active state for measurement and calcula- tion. When complete, updated sensor data is written to the output registers, and the core goes back to the Idle state. The EOC pin is set to a High level at this point, and the Busy status bit is set to 0. At any point during the Active or Idle periods, the SPI master can request the Status Byte by sending a Status Read command (a single byte with value 0xF0). As with the I2C configuration, a Busy bit of value 0 in the Status Byte or a high level on the EOC pin indicates that a valid data set may be read from the sensor. The Data Read command must be sent from the SPI master (The first byte of value 0xF0 fol- lowed by 6 bytes of 0x00). NOTE: Sending command data that is not defined in this document may cause unexpected device behavior. SPI Bus Communications Overview The sequence of bits and bus signals are shown in the following illustration (Figure 4). Refer to Figure 5 in the Interface Timing Diagram section for detailed timing data. Figure 4 - SPI Communications Diagram Page 8 Measurement Command SCLK - - - MOSI XXXX XXXX MISO HI-Z HI-Z SS Lower Command Bytes (0x00 0x00) C17 C16 C 15 C 1 C 0 XX XX XX C23 C22 C21 C20 C19 C18 - - - S7 S6 S5 S4 S3 S2 S1 S0 First Command Byte (0xAA / 0xAC / 0xAD / 0xAE / 0xAF) (Undefined Data) S7 … S0 (Status) - - - - - - Read Status Command SCLK MOSI MISO SS S3 S2 S1 S0 Command (0xF0) S7 … S0 (Status) 0 0 Don't care Don't Care Hi-Z Hi-Z S7 S6 S5 S4 1 1 1 1 0 0 Data Read Command SCLK MOSI MISO SS Command (0xF0 then 6 bytes of 0x00) - - - - - - P1 T23 T22 T1 T0 T23…T0 (Temperature) 0 0 0 0 0 - - - P0 0 0 0 0 0 0 - - - - - - - - - P23…P0 (Pressure) S7 … S0 (Status) 1 1 1 1 0 S1 S0 P23 P22 - - - - - - Don't Care Hi-Z Don't Care Hi-Z S7 S6 S5 S4 S3 S2 |
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