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CSDX Series
Digital pressure transducers
FEATURES * 0...25 mbar to 0...5 bar, 0...10 mbar to 0...1 bar, barometric range 800...1100 mbar * Absolute, gage or differential pressure * Digital readout via I2C-bus * Precision ASIC conditioning * Temperature compensated * Non-ratiometric output * Total accuracy 0.5 to 1.0 %FSS
SPECIFICATIONS
Maximum ratings
ELECTRICAL CONNECTION
N/C
Supply voltage VS Lead temperature (2 - 4 sec.) Temperature ranges Compensated Operating Storage Vibration Shock
4.75 V to 5.25 VDC max. 6.50 VDC
6 1 5
+Vs
250C
CSDX
SCL SDA IC 15 nF 220 nF
0 to +85C -20 to +105C -40 to +125C 10 g at 20 - 2000 Hz 100 g for 11 ms
Note:
7 2
84
3 GND
N/C
A capacitor of 220 nF is required between +Vs and GND. Pin 2 is an internal device connection and should be connected to ground with a 15 nF capacitor. It is important to place the capacitors as close to the pins as possible! Pins 4, 6 and 8 are internal device connections and should not be connected for any reason!
Caution! The sensor is not reverse polarity protected.
Incorrect applications of excitation voltage or ground to the wrong pin can cause electrical failure. Application of supply voltage above the maximum can cause electrical failure.
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CSDX Series
Digital pressure transducers
PRESSURE RANGES SPECIFICATIONS
(VS = 5.0 VDC, TA = 25C)
Part number
CSDX0811BARO C S D X 1000A 2R C S D X 2000A 2R C S D X 5000A 2R C S D X 0025D 4R CSDX0050G2R / D4R CSDX0100G2R / D4R CSDX0250G2R / D4R CSDX0500G2R / D4R CSDX1000G2R / D4R CSDX2000G2R / D4R CSDX5000G2R / D4R C S D X 0010D 4D C S D X 0025D 4D C S D X 0050D 4D C S D X 0100D 4D C S D X 0250D 4D C S D X 0500D 4D C S D X 1000D 4D
Pressure range
800 to 1100 0 to 1 0 to 2 0 to 5 0 to 25 0 to 50 0 to 100 0 to 250 0 to 500 0 to 1 0 to 2 0 to 5 0 to 10 0 to 25 0 to 50 0 to 100 0 to 250 0 to 500 0 to 1 bar(d) mbar (d) bar (g,d) mbar (g,d) bar (a) mbar(a)
Burst pressure1
2 2 4 10 0.2 0.35 0.35 1 1 2 4 10 0.2 0.2 0.35 0.35 1 1 2 bar (d) bar (g,d) bar (a)
Sensitivity (typ.)
10.7 3.2 1.6 0.6 128 64 32 12.8 6.4 3.2 1.6 0.6 160 64 32 16 6.4 3.2 1.6 counts/ mbar
Specification notes:
1. If maximum burst pressure is exceeded, even momentarily, the package may leak or burst, or the pressure sensing die may fracture. 2. Span is the algebraic difference between the output signal for the highest and lowest specified pressure. 3. Total accuracy is the combined error from offset and span calibration, linearity, pressure hysteresis, and temperature effects. Linearity is the measured deviation based on a straight line. Hysteresis is the maximum output difference at any point within the operating pressure range for increasing and decreasing pressure. Calibration errors include the deviation of offset and full scale from nominal values. 4. Delay time between sampling and signal change at the output. 5. The smallest change in the output voltage, given any change in pressure.
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CSDX Series
Digital pressure transducers
PERFORMANCE CHARACTERISTICS
The output signal is not ratiometric to the supply voltage (VS = 5.0 VDC, TA = 25C) All CSDX...R and CSDX0811BARO
Characteristics
Offset at lowest specified pressure CSDX0025... CSDX0050... CSDX0811BARO all others CSDX0025... CSDX0050... CSDX0811BARO all others CSDX0025... CSDX0050... CSDX0811BARO all others
Min.
368 384
Typ.
400 400 3200
Max.
432 416
Units
Full scale span (FSS) Full scale output
2
counts 3632 3616 1.0 0.5
3568 3584
3600 3600
Total accuracy (0 to 85C)
3
%FSS
Sample rate Response delay4 Startup time (power up to 1st result) Quantization step5 Current consumption CSDX0811BARO all others
100 2.73 4 2 6 14.11 40
Hz ms counts mA
All CSDX...D
Characteristics
Zero pressure offset CSDX0010... CSDX0025... CSDX0050... all others CSDX0010... CSDX0025... CSDX0050... all others CSDX0010... CSDX0025... CSDX0050... all others CSDX0010... CSDX0025... CSDX0050... all others
Min.
1968 1984
Typ.
2000 2000 3200
Max.
2032 2016
Units
Full scale span (FSS)2 Output at max. specified pressure
3568 3584 368 384
3600 3600 400 400
3632 3616 432 416 1.0 0.5
counts
at min. specified pressure
Total accuracy (0 to 85C)3
%FSS
Sample rate Response delay
4
100 2.73 2 6 14.11 40
Hz ms counts mA
3/7
Startup time (power up to 1st result) Quantization step5 Current consumption
February 2009 / 632
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CSDX Series
Digital pressure transducers
INTRODUCTION
The CSDX is capable to generate a digital output signal. It runs a cyclic program, which will store a corrected 12-bit sensor value about every 10 ms within the output registers of the internal ASIC. In order to use the pressure transducer for digital signal readout, the device should be connected to a bidirectional IC-bus. According to the IC-bus communication specification, the bus is controlled by a master device, which generates the clock signal, controls the bus access and generates START and STOP conditions. The CSDX is designed to work as a slave, hence it will only respond to requests from a master device. The IC-bus master-slave concept requires a unique address for each device. The CSDX has a hard coded slave address (1111000xb), therefore it is not possible to access more than one CSDX on the same IC-bus line. STOP condition (P): LOW to HIGH transition of SDA line while clock (SCL) is HIGH determines STOP condition. STOP conditions are always generated by the master. More than one request for the current pressure value can be transmitted without generation of intermediate STOP condition. DATA valid (D): State of data line represents valid data when, after START condition, data line is stable for duration of HIGH period of clock signal. Data on line must be changed during LOW period of clock signal. There is one clock pulse per bit of data. Acknowledge (A): Data is transferred in pieces of 8 bits (1 byte) on serial bus, MSB first. After each byte receiving device - whether master or slave - is obliged to pull data line LOW as acknowledge for reception of data. Master must generate an extra clock pulse for this purpose. When acknowledge is missed, slave transmitter becomes inactive. It is on master either to send last command again or to generate STOP condition in that case. Slave address: Each device connected to the bus has a unique slave address. After generating a START condition, the master has to transmit the slave address for the CSDX with a READ command: $F1. The CSDX must not be accessed with a WRITE command ($F0) as the correct function of the device can not be guaranteed in this case (note: a power-down power-up change will force the sensor to use factory data again). DATA operation: The CSDX starts to send 2 data bytes containing the current pressure value placed in the output registers.
DIGITAL I2C INTERFACE
The CSDX complies with the following protocol (FIGURE I): Bus not busy: During idle periods both data line (SDA) and clock line (SCL) remain HIGH. START condition (S): HIGH to LOW transition of SDA line while clock (SCL) is HIGH is interpreted as START condition. START conditions are always generated by the master. Each request for the current pressure value must be initiated with a START.
SCL
SDA
START condition Data valid Data allowed to change STOP condition
1 S Slave Address R/W A
Data Byte 1
A
Data Byte 2
S
Slave Address
Next command
P
Read out of pressure value
generated by master generated by slave S = START condition A = Acknowledge P = STOP condition
Data Byte 1 = High Byte (MSB first) Data Byte 2 = Low Byte (LSB last)
FIGURE I: IC-BUS Protocol of CSDX
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CSDX Series
Digital pressure transducers
I2C INTERFACE PARAMETERS
Parameter
Input high level Input low level Output low level Pull up current Load capacitance SDA SCL clock frequency Bus free time between STOP and START condition Hold time (repeated) START condition LOW period of SCL HIGH period of SCL Setup time repeated START condition Data hold time Data setup time Rise time of both SDA and SCL Fall time of both SDA and SCL Setup time for STOP condition Input filter spike suppression
Symbol
Conditions
Min.
90 0
Typ.
Max.
100 10 10 20 400 100
Unit
% of Vs A pF kHz s s s s s ns ns
(open drain, IOL = -4 mA) (pins SCL and SDA) FSC L tBUF tHD;STA tLOW tHIGH tSU;STA tHD;DAT tSU;DAT tR tF tSU;STO tSP sp i ke s o n S D A o r S C L o f that length are suppressed to first clock pulse
5 --4.7 4.0 4.7 4.0 4.7 0 250 ----4
300 300
ns ns s
50
ns
tSU;DAT SCL SDA
tHD;DAT
tSU;STA tHD;STA
tR
tF
tHIGH SCL SDA
tLOW
tSU;STO tBUF
tHD;STA
FIGURE II: Timing characteristics of the IC interface
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CSDX Series
Digital pressure transducers
PHYSICAL DIMENSIONS
D4 package
1.27 typ (0.050 typ) 16.89 (0.665)
7.87 typ (0.310 typ) 13.97 (0.550) 3.63 (0.143) 8.13 8.89 (0.350) (0.320) 1.78 (0.070) 16.64 0.64 (0.655 0.025) 2.29 (0.090)
High pressure port Low pressure port
3.38 (0.133) 8.26 typ (.325 typ)
0.51 typ (0.02 typ) 2.54 typ (0.100 typ) 4.5 (0.177)
G2 package
6.99 (0.275) 3.15 (0.124) 1.27 typ (0.050 typ) 13.97 (0.550) 2 typ 16.89 (0.665)
4.9 (0.193) 2.29 typ (0.090 typ) 2.79 typ (0.11 typ)
1.19 typ (0.047 typ)
8.89 5.08 (0.350) (0.200) 16.64 0.64 (0.655 0.025)
0.51 typ (0.02 typ) 4.5 (0.177) 2.54 typ (0.100 typ)
A2 package
1.27 typ (0.050 typ) 13.97 (0.550) 2.29 typ (0.090 typ) 8.0 typ (0.315 typ) 8.89 (0.350) 0.51 typ (0.02 typ) 2.54 typ (0.100 typ) 16.89 (0.665) 8.46 (0.333)
16.64 0.64 (0.655 0.025)
4.5 (0.177)
third angle projection
dimensions in mm (inches)
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CSDX Series
Digital pressure transducers
ELECTRICAL CONNECTIONS
CSDX...D4...
Vs (pin 1) identifier
Vs (pin 1) identifier
+Vs IC GND N/C
CSDX...G2R
SCL N/C SDA N/C
+Vs IC GND N/C
SCL N/C SDA N/C
CSDX...A2R, CSDX...BARO
SCL N/C SDA N/C +Vs IC GND N/C
Vs (pin 1) identifier
Note: Pins 4, 6 and 8 are internal device connections and should not be connected for any reason. Pin 2 is an internal device connection and should be connected to ground with a 15 nF capacitor.
ORDERING INFORMATION
Pressure range
0 to 25 mbar 0 to 50 mbar 0 to 100 mbar 0 to 250 mbar 0 to 500 mbar 800 to 1100 mbar 0 to 1 bar 0 to 2 bar 0 to 5 bar 0 to 10 mbar 0 to 25 mbar 0 to 50 mbar 0 to 100 mbar 0 to 250 mbar 0 to 500 mbar 0 to 1 bar
Absolute
Gage
CSDX0050G2R CSDX0100G2R CSDX0250G2R CSDX0500G2R CSDX1000G2R CSDX2000G2R CSDX5000G2R
Differential/Gage
C S D X 0025D 4R C S D X 0050D 4R C S D X 0100D 4R C S D X 0250D 4R C S D X 0500D 4R C S D X 1000D 4R C S D X 2000D 4R C S D X 5000D 4R C S D X 0010D 4D C S D X 0025D 4D C S D X 0050D 4D C S D X 0100D 4D C S D X 0250D 4D C S D X 0500D 4D C S D X 1000D 4D
CSDX0811BARO C S D X 1000A 2R C S D X 2000A 2R C S D X 5000A 2R
Other pressure ranges or calibrations are available on request
Sensortechnics reserves the right to make changes to any products herein. Sensortechnics does not assume any liability arising out of the application or use of any product or circuit described herein, neither does it convey any license under its patent rights nor the rights of others. February 2009 / 632 7/7
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