T5400SAW Components
Digital barometric pressure sensor
Preliminary data
3 April 25, 2013
Please read
cautions and warnings and
important notes
at the end of this document.
General description
The T5400 is a fully calibrated digital pressure sensor. Based on the proven EPCOS piezoresistive
MEMS technology the sensor module provides high accuracy and long-term stability. The very small
size of only 2.78 mm × 2.23 mm and the low current consumption allows the integration into a multitude
of mobile and stationary applications like personal navigation devices, mobile phones, altimeters and
hard disk drives. Two high speed serial interfaces, I
2
C (3.4 MHz) and SPI (20 MHz), offer a high flexi-
bility to connect the T5400 to almost every microcontroller platform.
After initialisation calibration coefficients need to be transferred from the sensor memory to the micro-
controller. Afterwards the sensor transmits the raw pressure and temperature readings on request. The
user can select between four different operating modes from 5.1 Pa (0.42 m) to 2.7 Pa (0.22 m) RMS
noise. The calculation of the actual pressure and altitude is done by the microcontroller.
Electrical characteristics
Temperature range for specification
unless otherwise noted: T = –30 °C ... +85 °C
Ambient temperature of test conditions: T
A
= 25 °C
Supply voltage: V
DD
= 1.8 V
All voltages refer to ground.
Min. Typ. Max. Unit Note or condition
Current consumption
1)
I
IDLE
— 0.15 0.3 µA –30 °C ... 25 °C
—1—
µA 25 °C ... 70 °C
—3—
µA 70 °C ... 85 °C
I
PEAK_P
— 790 — µA
during pressure
measurement
2)
I
PEAK_T
— 500 — µA
during temperature
measurement
2)
Pressure range p 300 — 1100 hPa
Resolution pressure
reading
— 2.9 — Pa
Absolute accuracy
pressure sensor
3)
∆p–3–1+2hPa
p = 300 hPa ... 1100 hPa
T = 0 °C ... 65 °C
–3 0 +5
hPa
p = 300 hPa ... 1100 hPa
T = –20 °C ... 0 °C
Relative accuracy
pressure sensor
3)
∆p—± 0.15 — hPa
p = 950 hPa ... 1050 hPa
T = 25 °C
— ± 0.14 —
hPa
T = 25 °C ... 40 °C
p
const
= 500 hPa ...1100 hPa
4)
