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DS-0350 Datasheet(PDF) 8 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) 8 Page - All Sensors Corporation

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DLHR 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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