SMD500 Datasheet, PDF (3/10 Pages) List of Unclassifed Manufacturers – Altimeter / Barometer Module ultra low power, low voltage

2. General Function and application schematics
The SMD500 consists of a piezoresistive sensor, an analog to digital converter, control unit with PROM and a serial I²C interface.
The SMD500 converts the uncompensated value of pressure and temperature from the pressure sensor and has stored 64 bit of
individual calibration data in a PROM. This calibration data is used to compensate offset, temperature dependence etc. of the
sensor.
pressure data word (16 bit word, 16 bit resolution) UP
temperature data word (16 bit word, 16 bit resolution)
UT
The SMD500 is designed to be connected directly to a microcontroller of a mobile device via the I²C interface.
100 nF
+
4.7 µF
2.2 … 3.6 V
SMD500
Sensor
element
PROM
VDDA VDDD
R_p(1)
Control
Unit
SDA
SCL
XCLR
R_p(1)
µController
e. g. 8 bit
I²C
interface
ADC
MCLK
GND
32768 Hz or
1 MHz
(register option)
Note:
(1) Pull-up resistors for I²C bus, R_p = 2.2 kΩ … 10 kΩ, typ. 4.7 kΩ
Display
Figure 1: Typical application circuit
To guarantee conversion accuracy two supply voltage decoupling capacitors of 4.7 µF and 100 nF should be placed between
VDD and GND of the SMD500.
3
Bosch Sensortec GmbH reserves all rights in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties.
BOSCH and the symbols are registered trademarks of Robert Bosch GmbH, Germany.