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SEN-12039

P1-P3P4-P6P7-P9P10-P11
T5400SAW Components
Digital barometric pressure sensor
Preliminary data
7 April 25, 2013
Please read
cautions and warnings and
important notes
at the end of this document.
SPI mode
Min. Typ. Max. Unit
SCLK clock frequency f
SCL
— — 20 MHz
SS activation time t
SSA
21 — — ns
SCLK clock low time t
CKL
21 — — ns
SCLK clock high time t
CKH
21 — — ns
SS deactivation time t
SSD
21 — — ns
MOSI setup time t
DSO
6——ns
MISO setup time t
QS
10 — — ns
MOSI hold time t
DO
6——ns
MISO hold time t
QH
0——ns
Maximum capacitive load C
MAX
—25
1)
1)
Typically at f
SCL
= 20 MHz.
—pF
T5400SAW Components
Digital barometric pressure sensor
Preliminary data
8 April 25, 2013
Please read
cautions and warnings and
important notes
at the end of this document.
Function
The T5400 is a fully calibrated digital pressure sensor module. It consists of a piezoresistive MEMS
pressure sensor element and an ASIC with integrated temperature sensor, analog to digital converter
ADC, memory and digital circuitry. The analog bridge voltage of the pressure sensor and the output
voltage of the temperature sensor are routed through a multiplexer and a gain stage to the ADC. The
logic-core controls the different function blocks.
After initialisation the calibration parameters stored in the memory will be transmitted to the MCU (micro-
controller unit). Afterwards only the raw pressure and temperature values are transmitted. After a
request from the MCU a pressure or/and a temperature measurement is performed. Depending on the
accuracy, time and power consumption requirements one out of four different operation modes can be
selected before a measurement is executed.
The end of a measurement is indicated on the EOC (end of conversion) pin. Then the MCU can request
the raw measurement values and calculate the actual pressure and temperature values using the
calibration data. To optimize power consumption the T5400 enters the idle mode between two measure-
ments. Further details and source code examples are available in an application note.
Typical application
T5400
T5400SAW Components
Digital barometric pressure sensor
Preliminary data
9 April 25, 2013
Please read
cautions and warnings and
important notes
at the end of this document.
Cautions and warnings
■ Immersion of the sensor in liquids e.g. a flux cleaning process is not possible.
■ For optimum performance avoid direct light exposure.
■ Media compatibility with the pressure sensor must be ensured. Do not expose the sensor to corrosive
or explosive gases.
Pressure conversion table
Annotations
■ bar Bar
■ Pa Pascal (≡ 1 N/m
2
)
■ hPa Hecto-Pascal (≡ 1 mbar)
■ mmHg mm column of mercury (≡ 1 Torr)
■ psi Pounds per square inch (≡ 1 lbf/in
2
)
Assembly conditions
Solder reflow profile According to EPCOS specification S_6001
Max. number of reflows 3
Max. peak temperature 260 °C
Moisture sensitivity level MSL 3
Unit bar mbar Pa hPa kPa mmHg psi
1 bar 1 1000 100000 1000 100 750.063 14.504
1 mbar 0.001 1 100 1 0.1 0.750 0.0145
1 Pa 0.00001 0.01 1 0.01 0.001 0.0075 0.000145
1 hPa 0.001 1 100 1 0.1 0.750 0.0145
1 kPa 0.01 10 1000 10 1 7.5006 0.145
1 mmHg 0.00133 1.3332 133.322 1.3332 0.13332 1 0.01933
1 psi 0.0689476 68.9476 6894.76 68.9476 6.89476 51.7151 1
P1-P3P4-P6P7-P9P10-P11

SEN-12039

Mfr. #:
Buy SEN-12039
Manufacturer:
SparkFun
Description:
Pressure Sensor Development Tools Barometric Sensor B/O T5403
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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