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MS5803-02BA Datasheet(PDF) 7 Page - TE Connectivity Ltd

Part No. MS5803-02BA
Description  High resolution module, 20cm
Download  19 Pages
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Maker  TEC [TE Connectivity Ltd]
Homepage  http://www.te.com/usa-en/home.html
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MS5803-02BA Datasheet(HTML) 7 Page - TE Connectivity Ltd

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MS5803-02BA
Miniature Altimeter Module
SENSOR SOLUTIONS ///MS5803-02BA
09/2015
Page 7
FUNCTIONAL DESCRIPTION
Figure 1: Block diagram of MS5803-02BA
GENERAL
The MS5803-02BA consists of a piezo-resistive sensor and a sensor interface IC. The main function of the MS5803-
02BA is to convert the uncompensated analogue output voltage from the piezo-resistive pressure sensor to a 24-
bit digital value, as well as providing a 24-bit digital value for the temperature of the sensor.
FACTORY CALIBRATION
Every module is individually factory calibrated at two temperatures and two pressures. As a result, 6 coefficients
necessary to compensate for process variations and temperature variations are calculated and stored in the 128-
bit PROM of each module. These bits (partitioned into 6 coefficients W1 to W6) must be read by the microcontroller
software and used in the program converting D1 and D2 into compensated pressure and temperature values.
The 2 coefficients W0 and W7 are for factory configuration and CRC.
SERIAL INTERFACE
The MS5803-02BA has built in two types of serial interfaces: SPI and I2C. Pulling the Protocol Select pin PS to low
selects the SPI protocol, pulling PS to high activates the I2C bus protocol.
Pin PS
Mode
Pins used
High
I2C
SDA, SCL, CSB
Low
SPI
SDI, SDO, SCLK, CSB
SPI MODE
The external microcontroller clocks in the data through the input SCLK (Serial CLocK) and SDI (Serial Data In). In
the SPI mode module can accept both mode 0 and mode 3 for the clock polarity and phase. The sensor responds
on the output SDO (Serial Data Out). The pin CSB (Chip Select) is used to enable/disable the interface, so that
other devices can talk on the same SPI bus. The CSB pin can be pulled high after the command is sent or after the
end of the command execution (for example end of conversion). The best noise performance from the module is
obtained when the SPI bus is quiet and without communication to other devices during the ADC conversion in
progress.
VDD
GND
PS
SCLK / SCL
SDO
SDI / SDA
Meas. MUX
ADC
Digital
Interface
Memory
(PROM)
128 bits
SENSOR
SGND
+IN
-IN
dig.
Filter
Sensor
Interface IC
PGA
CSB


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