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DLHR-L30G Datasheet(PDF) 6 Page - All Sensors Corporation |
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DLHR-L30G Datasheet(HTML) 6 Page - All Sensors Corporation |
6 / 16 page DLHR Series Low Voltage Digital Pressure Sensors Digital Interface Data Format For either type of digital interface, the format of data returned from the sensor is the same. The first byte consists of the Status Byte followed by a 24-bit unsigned pressure value and a 24-bit unsigned temperature value. Unused bits beyond the calibrated bit width are undefined, and may have any value. See the Pressure Output Transfer Function and Temperature Output Transfer Function definitions on page 3 for converting to pressure and temperature. Refer to Table 2 for the overall data format of the sensor. Table 3 shows the Status Byte definition. Note that a completed reading without error will return status 0x40. Table 2 - Output Data Format Table 3- Status Byte Definition I2C Interface I2C Command Sequence The part enters Idle state after power-up, and waits for a command from the bus master. Any of the five Measurement commands may be sent, as shown in Table 1. Following receipt of one of these 3-byte commands, the EOC pin is set to Low level, and the sensor Busy bit is set in the Status Byte. After completion of measurement and calculation in the Active state, compensated data is written to the output registers, the EOC pin is set high, and the processing core goes back to Idle state. The host processor can then perform the Data Read operation, which for I2C is simply a 7-byte Device Read. If the EOC pin is not monitored, the host can poll the Status Byte by repeating the Status Read command, which for I2C is a one-byte Device Read. When the Busy bit in the Status byte is zero, this indicate that valid data is ready, and a full Data Read of all 7 bytes may be performed. Page 6 S[7:0] P[23:16] P[15:8] P[7:0] T[23:16] T[15:8] T[7:0] Status Pressure Pressure Pressure Temperature Temperature Temperature Byte Byte 3 Byte 1 Byte 0 Byte 3 Byte 1 Byte 0 Bit Description Bit 7 [MSB] [Always = 0] 6 Power : [1 = Power On] 5 Busy: [ 1 = Processing Command, 0 = Ready] 4:3 Mode: [00 = Normal Operation ] 2 Memory Error [ 1 = EEPROM Checksum Fail] 1 Sensor Configuration [ always = 0] Bit 0 [LSB] ALU Error [1 = Error] |
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