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PDF MS5535C Data sheet ( Hoja de datos )
| Número de pieza | MS5535C | |
| Descripción | 14 bar Pressure Sensor Module | |
| Fabricantes | TE | |
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MS5535C
14 bar Pressure Sensor Module
SPECIFICATIONS
0 – 14 bar absolute pressure range
6 coefficients for software compensation stored
on-chip
Piezoresistive silicon micromachined sensor
Integrated miniature pressure sensor 9 x 9 mm
16 Bit ADC
3-wire serial interface
1 system clock line (32.768 kHz)
Low voltage and low power consumption
The MS5535C is a SMD-hybrid device including a
piezoresistive pressure sensor and an ADC-Interface IC. It
provides a 16 Bit data word from a pressure and temperature
dependent voltage. Additionally the module contains 6 readable
coefficients for a highly accurate software calibration of the sensor.
MS5535C is a low power, low voltage device with automatic power
down (ON/OFF) switching. A 3-wire interface is used for all
communications with a microcontroller.
The MS5535C is fully software compatible to the previous versions
(MS5535A and MS5535B). Compared to the previous versions the
ESD sensitivity has been improved to 4kV on all pins.
SENSOR SOLUTIONS ///MS5535C
09/2015
Page 1
1 page  
MS5535C
14 bar Pressure Sensor Module
ELECTRICAL CHARACTERISTICS
DIGITAL INPUTS
Parameter
Input High Voltage
Input Low Voltage
Signal Rise Time
Signal Fall Time
Symbol
VIH
VIL
tr
tf
Conditions
(T = -40 °C .. 125 °C, VDD = 2.2 V .. 3.6 V)
Min Typ Max Unit
80% VDD
100% VDD
V
0% VDD
20% VDD
V
200 ns
200 ns
DIGITAL OUTPUTS
Parameter
Output High Voltage
Output Low Voltage
Signal Rise Time
Signal Fall Time
AD-CONVERTER
Parameter
Resolution
Linear Range
Conversion Time
INL
Symbol
VOH
VOL
tr
tf
Conditions
Isource = 0.6 mA
Isink = 0.6 mA
(T = -40 °C .. 125 °C, VDD = 2.2 V .. 3.6 V)
Min Typ Max Unit
80% VDD
100% VDD
V
0% VDD
20% VDD
V
200 ns
200 ns
Symbol Conditions
MCLK = 32.768 kHz
Within linear range
(T = -40 °C .. 125 °C, VDD = 2.2 V .. 3.6 V)
Min Typ Max Unit
16 Bit
4'000
40'000
LSB
35 ms
-5 +5 LSB
SENSOR SOLUTIONS ///MS5535C
09/2015
Page 5
5 Page 
MS5535C
14 bar Pressure Sensor Module
FUNCTION
GENERAL
The MS5535C consists of a piezo-resistive sensor and a sensor interface IC. The main function of the MS5535C is
to convert the uncompensated analogue output voltage from the piezo-resistive pressure sensor to a 16-bit digital
value, as well as providing a 16-bit digital value for the temperature of the sensor.
Measured pressure (16-bit)
“D1”
Measured temperature (16-bit)
“D2”
As the output voltage of a pressure sensor is strongly dependent on temperature and process tolerances, it is
necessary to compensate for these effects. This compensation procedure must be performed by software using an
external microcontroller.
Sensor
D1
D2
Word1..4
Calculation
in external
micro-
controller
Pressure
Temperature
For both pressure and temperature measurement the same ADC is used (sigma delta converter):
• for the pressure measurement, the differential output voltage from the pressure sensor is converted
• for the temperature measurement, the sensor bridge resistor is sensed and converted
During both measurements the sensor will only be switched on for a very short time in order to reduce power
consumption. As both, the bridge bias and the reference voltage for the ADC are derived from VDD, the digital output
data is independent of the supply voltage.
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 64-bit
PROM of each module. These 64-bit (partitioned into four words of 16-bit) must be read by the microcontroller
software and used in the program converting D1 and D2 into compensated pressure and temperature values.
PRESSURE AND TEMPERATURE MEASUREMENT
The sequence of reading pressure and temperature as well as of performing the software compensation is depicted
in Fig. 3 and Fig. 5.
First Word1 to Word4 have to be read through the serial interface. This can be done once after reset of the
microcontroller that interfaces to the MS5535C. Next, the compensation coefficients C1 to C6 are extracted using
bit-wise logical- and shift-operations (refer to Fig. 4 for the bit-pattern of Word1 to Word4).
For the pressure measurement, the microcontroller has to read the 16-bit values for pressure (D1) and temperature
(D2) via the serial interface in a loop (for instance every second). Then, the compensated pressure is calculated
out of D1, D2 and C1 to C6 according to the algorithm in Fig. 3 (possibly using quadratic temperature compensation
according to Fig. 5). All calculations can be performed with signed 16-bit variables. Results of multiplications may
be up to 32-bit long (+sign). In the flow according to Fig. 3 a division follows each multiplication. This division can
be performed by bit-wise shifting (divisors are to the power of 2). It is ensured that the results of these divisions are
less than 65536 (16 bit).
For the timing of signals to read out Word1 to Word4, D1, and D2 please refer to the paragraph “Serial Interface".
SENSOR SOLUTIONS ///MS5535C
09/2015
Page 11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet MS5535C.PDF ] | |
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