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DS-0350 Datasheet(PDF) 5 Page - All Sensors Corporation

Part No. DS-0350
Description  DLHR Series Low Voltage Digital Pressure Sensors
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Maker  ASC [All Sensors Corporation]
Homepage  https://www.allsensors.com/
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DS-0350 Datasheet(HTML) 5 Page - All Sensors Corporation

 
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All Sensors
DS-0350 Rev A
Operation Overview
Page 5
Figure 2 - DLHR Communication Model
Digital Interface Command Formats
When requesting the start of a measurement, the command format for both I2C and SPI is the same.
When requesting sensor status over I2C, the host simply performs a 1-byte read transfer.
When requesting sensor status over SPI, the host must send the Status Read command byte while reading 1 byte.
When reading sensor data over I2C, the host simply performs a 7-byte read transfer.
When reading sensor data over SPI, the host must send the 7-byte Data Read command while reading the data.
See Table 1 below for Measurement Commands, Sensor Data read and Sensor Status read details.
Table 1 - DLHR Sensor Command Set
Start-Single Command
Internal State
Interal Operation
DSP
DSP
New Data Available
EOC
Start-Average2 / 4 / 8 / 16 Commands (Auto Averaging)
Internal State
Interal Operation
DSP
New Data Available
EOC
Idle
Idle
Active
ADC (T, Z, P)…
Idle
Idle
ADC (Temp, Zero, Pressure)n
ADC (Temp, Zero, Pressure)1
Active
Idle
Idle
Idle
Idle
ADC (Temp, Zero, Pressure)
ADC (Temp, Zero, Pressure)
Data Read
Start-Average2/4/8/16
Active
Command
Start-Single
Data Read
Start-Single
Command
Start-Average2/4/8/16
Active
Idle
Idle
0xAA
0x00
0x00
0xAC
0x00
0x00
0xAD
0x00
0x00
0xAE
0x00
0x00
0xAF
0x00
0x00
I2C
SPI
I2C
SPI
Read of 1 byte from device.
Read of 1 byte from device
Host must send [0xF0] on MOSI
Sensor Returns 1 byte on MISO
Start‐Average8
Start‐Average16
Read Sensor Data
Read of 7 bytes from device
Read of 7 bytes from device
Host must send [0xF0], then 6 bytes of [0x00] on MOSI
Sensor Returns 7 bytes on MISO
Read Sensor Status
Start‐Average4
Measurement Commands (I2C or SPI)
Description
Command ( 3 bytes )
Start‐Single
Start‐Average2


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