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PDF LPS331AP Data sheet ( Hoja de datos )
| Número de pieza | LPS331AP | |
| Descripción | MEMS pressure sensor | |
| Fabricantes | STMicroelectronics | |
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LPS331AP
MEMS pressure sensor: 260-1260 mbar absolute digital output
barometer
Datasheet −production data
Features
■ 260 to 1260 mbar absolute pressure range
■ High-resolution mode: 0.020 mbar RMS
■ Low power consumption:
– Low resolution mode: 5.5 µA
– High resolution mode: 30 µA
■ High overpressure capability: 20x full scale
■ Embedded temperature compensation
■ Embedded 24-bit ADC
■ Selectable ODR from 1 Hz to 25 Hz
■ SPI and I2C interfaces
■ Supply voltage: 1.71 to 3.6 V
■ High shock survivability: 10,000 g
■ Small and thin package
■ ECOPACK® lead-free compliant
Applications
■ Indoor and outdoor navigation
■ Enhanced GPS for dead-reckoning
■ Altimeter and barometer for portable devices
■ Weather station equipment
■ Sport watches
Description
The LPS331AP is an ultra compact absolute
piezoresistive pressure sensor. It includes a
monolithic sensing element and an IC interface
able to take the information from the sensing
element and to provide a digital signal to the
external world.
Table 1. Device summary
Order codes
Temperature range [°C]
LPS331APY
LPS331APTR
-40 to +85
HCLGA-16L
(3 x 3 x 1 mm)
The sensing element consists of a suspended
membrane realized inside a single mono-silicon
substrate. It is capable to detecting pressure and
is manufactured using a dedicated process
developed by ST, called VENSENS.
The VENSENS process allows to build a mono-
silicon membrane above an air cavity with
controlled gap and defined pressure. The
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membrane is very small compared to the
traditionally built silicon micromachined
membranes. Membrane breakage is prevented by
an intrinsic mechanical stopper.
The IC interface is manufactured using a standard
CMOS process that allows a high level of
integration to design a dedicated circuit which is
trimmed to better match the sensing element
characteristics.
The LPS331AP is available in a small holed cap
land grid array (HCLGA) package and it is
guaranteed to operate over a temperature range
extending from -40 °C to +85 °C. The package is
holed to allow external pressure to reach the
sensing element.
Package
HCLGA-16L
Packing
Tray
Tape and reel
March 2012
This is information on a product in full production.
Doc ID 022112 Rev 7
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Datasheet pdf - http://www.DataSheet4U.co.kr/
1 page  
LPS331AP
Mechanical and electrical specifications
2 Mechanical and electrical specifications
2.1
Conditions at VDD = 2.5 V, T = 25 °C, unless otherwise noted.
Mechanical characteristics
.
Table 3.
Symbol
Mechanical characteristics
Parameter
Test condition
Min. Typ.(1) Max. Unit
Top
Tfull
Pop
Pbits
Operating temperature range
Full accuracy temperature
range
Operating pressure range
Pressure output data
Pres Pressure sensitivity
Paccrel
Relative accuracy over
pressure(2)
PaccT
Absolute accuracy pressure
over temperature(3)
P = 800 to 1100 mbar
T= 25°C
P = 800 to 1100 mbar
T = 0 ∼+80 °C
Pnoise Pressure noise
Tbits
Tres
Tacc
Temperature output data
Temperature sensitivity
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Absolute accuracy temperature T= 0~+80 °C
-40 –
85
0 – 80
260 – 1260
– 24
–
– 4096 –
– ± 0.1 ± 0.2
- 3.2 ± 2 2.6
See Table 17.
– 16 –
– 480 –
– ±2 –
°C
°C
mbar
bits
LSB/
mbar
mbar
mbar
mbar
RMS
bits
LSB/°C
°C
1. Typical specifications are not guaranteed.
2. Characterization data. Parameter not tested at final test
3. Embedded pwl compensation.
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Datasheet
p
5 Page 
LPS331AP
Digital interfaces
5.2.1
I2C operation
The transaction on the bus is started through a START (ST) signal. A start condition is
defined as a HIGH to LOW transition on the data line while the SCL line is held HIGH. After
this has been transmitted by the master, the bus is considered busy. The next byte of data
transmitted after the start condition contains the address of the slave in the first 7 bits and
the eighth bit tells whether the master is receiving data from the slave or transmitting data to
the slave. When an address is sent, each device in the system compares the first seven bits
after a start condition with its address. If they match, the device considers itself addressed
by the master.
The slave address (SAD) associated to the LPS331AP is 101110xb. The SDO/SA0 pad can
be used to modify the less significant bit of the device address. If the SA0 pad is connected
to voltage supply, LSb is ‘1’ (address 1011101b), otherwise if the SA0 pad is connected to
ground, the LSb value is ‘0’ (address 1011100b). This solution permits to connect and
address two different LPS331APs to the same I2C lines.
Data transfer with acknowledge is mandatory. The transmitter must release the SDA line
during the acknowledge pulse. The receiver must then pull the data line LOW so that it
remains stable low during the HIGH period of the acknowledge clock pulse. A receiver which
has been addressed is obliged to generate an acknowledge after each byte of data
received.
The I2C embedded in the LPS331AP behaves like a slave device and the following protocol
must be adhered to. After the start condition (ST) a slave address is sent, once a slave
acknowledge (SAK) has been returned, a 8-bit sub-address (SUB) will be transmitted: the 7
LSB represents the actual register address while the MSB enables address auto increment.
If the MSb of the SUB field is ‘1’, the SUB (register address) will be automatically increased
to allow multiple data read/write.
The slave address is completed with a Read/Write bit. If the bit was ‘1’ (Read), a repeated
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START (SR) condition must be issued after the two sub-address bytes; if the bit is ‘0’ (Write)
the master will transmit to the slave with direction unchanged. Table 9 explains how the
SAD+read/write bit pattern is composed, listing all the possible configurations.
Table 9. SAD+Read/Write patterns
Command
SAD[6:1]
SAD[0] = SA0
Read
101110
0
Write
101110
0
Read
101110
1
Write
101110
1
R/W SAD+R/W
1 10111001 (B9h)
0 10111000 (B8h)
1 10111011 (BBh)
0 10111010 (BAh)
Table 10.
Master
Slave
Transfer when master is writing one byte to slave
ST SAD + W
SUB
DATA
SAK
SAK
SAK
SP
Table 11. Transfer when master is writing multiple bytes to slave
Master
ST
SAD + W
SUB
DATA
DATA
Slave
SAK
SAK
SAK
SAK
SP
Doc ID 022112 Rev 7
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