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PDF LPS25HB Data sheet ( Hoja de datos )
| Número de pieza | LPS25HB | |
| Descripción | MEMS pressure sensor | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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LPS25HB
MEMS pressure sensor: 260-1260 hPa absolute
digital output barometer
Datasheet - production data
HLGA 10L
(2.5 x 2.5 x 0.76 mm typ.)
Features
• 260 to 1260 hPa absolute pressure range
• High-resolution mode: 0.01 hPa RMS
• Low-power consumption
– Low-resolution mode: 4 µA
– High-resolution mode with FIFO: 4.5 µA
• High overpressure capability: 20x full scale
• Embedded temperature compensation
• 24-bit pressure data output
• ODR from 1 Hz to 25 Hz
• SPI and I2C interfaces
• Embedded FIFO
• Interrupt functions: Data Ready, FIFO flags,
pressure thresholds
• Supply voltage: 1.7 to 3.6 V
• High shock survivability: 10,000 g
• ECOPACK® lead-free compliant
Applications
• Altimeter and barometer for portable devices
• Enhanced GPS applications
• Weather station equipment
• Wearable devices
Description
The LPS25HB is a piezoresistive absolute
pressure sensor which functions as a digital
output barometer. The device comprises a
sensing element and an IC interface which
communicates through I2C or SPI from the
sensing element to the application.
The sensing element, which detects absolute
pressure, consists of a suspended membrane
manufactured using a dedicated process
developed by ST.
The LPS25HB is available in a full-mold, holed
LGA package (HLGA). It is guaranteed to operate
over a temperature range extending from -30 to
+105 °C. The package is holed to allow external
pressure to reach the sensing element.
Order code
LPS25HBTR
Table 1. Device summary
Temperature range [°C]
Package
-30 to +105°C
HLGA-10L
Packing
Tape and reel
May 2015
This is information on a product in full production.
DocID027112 Rev 2
1/40
www.st.com
1 page  
LPS25HB
List of figures
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Pin connections (bottom view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
SPI slave timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
I2C slave timing diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
LPS25HB electrical connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Read and write protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
SPI read protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Multiple byte SPI read protocol (2-byte example) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
SPI write protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Multiple byte SPI write protocol (2-byte example). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
SPI read protocol in 3-wire mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Interrupt generation block and output pressure data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
HLGA-10L (2.5 x 2.5 x 0.76 mm typ.) outline and mechanical data . . . . . . . . . . . . . . . . . . 38
DocID027112 Rev 2
5/40
40
5 Page 
LPS25HB
Mechanical and electrical specifications
2.3.2
I2C - inter-IC control interface
Subject to general operating conditions for Vdd and TOP.
Symbol
Table 6. I2C slave timing values
Parameter (1)
I²C standard mode(1)
Min Max
I²C fast mode(1)
Min Max
f(SCL)
tw(SCLL)
tw(SCLH)
tsu(SDA)
th(SDA)
tr(SDA) tr(SCL)
tf(SDA) tf(SCL)
th(ST)
tsu(SR)
SCL clock frequency
SCL clock low time
SCL clock high time
SDA setup time
SDA data hold time
SDA and SCL rise time
SDA and SCL fall time
START condition hold time
Repeated START condition
setup time
0
4.7
4.0
250
0.01
4
4.7
100
3.45
1000
300
0
1.3
0.6
100
0
20 + 0.1Cb(2)
20 + 0.1Cb(2)
0.6
0.6
400
0.9
300
300
tsu(SP)
STOP condition setup time
4
tw(SP:SR)
Bus free time between STOP
and START condition
4.7
1. Data based on standard I2C protocol requirement, not tested in production.
2. Cb = total capacitance of one bus line, in pF.
0.6
1.3
Unit
kHz
µs
ns
µs
ns
µs
Figure 4. I2C slave timing diagram
SDA
START
REPEATED
START
tsu(SR)
tw(SP:SR)
START
tf(SDA)
SCL
tr(SDA)
tsu(SDA)
th(SDA)
tsu(SP)
STOP
Note:
th(ST) tw(SCLL)
tw(SCLH)
tr(SCL)
tf(SCL)
Measurement points are done at 0.2·Vdd_IO and 0.8·Vdd_IO, for both ports.
DocID027112 Rev 2
11/40
40
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LPS25HB.PDF ] | |
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