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LMES025U Datasheet(PDF) 7 Page - Sensortechnics GmbH

Part No. LMES025U
Description  digital low differential pressure sensors
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Maker  SENSORTECHNICS [Sensortechnics GmbH]
Homepage  http://www.sensortechnics.com
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LMES025U Datasheet(HTML) 7 Page - Sensortechnics GmbH

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E / 11822 / C
LME series – digital low differential pressure sensors
Page 7/12
Subject to change without notice
www.first-sensor.com
contact@first-sensor.com
SPI – Serial Peripheral Interface (cont.)
Data read – pressure
When powered on, the sensor begins to continuously measure pressure.
To initiate data transfer from the sensor, the following three unique
bytes must be written sequentially, MSB first, to the MOSI pin (see
Figure 5):
The entire 16 bit content of the LME register is then read out on the
MISO pin, MSB first, by applying 16 successive clock pulses to SCLK
with /CS asserted low. Note that the value of the LSB is held at zero for
internal signal processing purposes. This is below the noise threshold of
the sensor and thus its fixed value does not affect sensor performance
and accuracy.
From the digital sensor output the actual pressure value can be
calculated as follows:
For example, for a ±250 Pa sensor (LMES250B...) with a scale factor
of 120 a digital output of 30 000 counts (7530’h) calculates to a
positive pressure of 250 Pa. Similarly, a digital output of -30 000 counts
(8AD0’h) calculates to a negative pressure of -250 Pa.
Step
Hexadecimal
Binary
Description
1
0x2D
B00101101
Poll current pressure measurement
2
0x14
B00010100
Send result to data register
3
0x98
B10011000
Read data register
Pressure [Pa] =
Digital output [counts]
Scale factor
[counts
]
Pa
0
1 0 1 1
1
0
0 0
1 0 1 0 0
0
0
1
0 1 1
0
0
0
0
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Fig. 5: SPI data transfer
MOSI
MISO
SCLK
(CPOL=0)
(CPHA=0)
/CS
Step 1
Step 2
Step 3
Data from sensor
MOSI
MISO
SCLK
(CPOL=0)
(CPHA=0)
/CS
MSB
LSB


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