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DSDXL Series
Digital pressure transducers
FEATURES
* 0...5, 0...10, 0...10 "H2O differential/gage * Digital readout via I2C-bus * Precision ASIC conditioning * Temperature compensated * Non-ratiometric output
GENERAL DESCRIPTION
The DSDXL series offers a digital interface on a very cost-effective basis. This family is fully calibrated and temperature compensated using an on-board ASIC. These sensors are intended for use with non-corrosive, non-ionic working fluids such as air and dry gases. The DSDXL010D4R device is available to measure gage pressure from 0...10 "H2O.
APPLICATIONS
* Medical instrumentation * HVAC controls * Pneumatic controls
The DSDXL...4D devices are available to measure differential pressures from 0...5 "H 2 O (DSDXL005D4D) to 0...10 "H 2 O (DSDXL010D4D). Differential devices allow application of pressure to either side of the sensing diaphragm and can be used for gage or differential measurements.
All DSDXL devices are accurate to within 2.5 %FSS. The devices are characterized for operation from a single 5 V supply. The sensor is designed and manufactured according to standards laid down in ISO 9001.
ELECTRICAL CONNECTION
+Vs
N/C
Note: 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!
6
1 5 SCL SDA IC 15 nF 220 nF
DSDXL
7 2
84
3
Pins 4, 6 and 8 are internal device connections and should not be connected for any reason!
N/C
GND
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DSDXL Series
Digital pressure transducers
PRESSURE SENSOR CHARACTERISTICS
Maximum ratings Supply voltage VS Output current Sink Source Lead temperature (2 - 4 sec.) Common mode pressure 4.75 V to 5.25 VDC max. 6.50 VDC 2 mA (max.) 2 mA (max.) 250C 50 psi Environmental specifications Temperature ranges Compensated Operating Storage Vibration: Shock:
0 to +85C -20 to +105C -40 to +125C 10 g at 20 - 2000 Hz 50 g for 11 ms
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.
PERFORMANCE CHARACTERISTICS
(VS = 5.0 VDC, TA = 25C)
Part number
D S D X L005D 4D D S D X L010D 4D D S D X L010D 4R
Pressure range
0...5 0...10 0...10 "H2O
Burst pressure1
3 3 3 p si
Sensitivity (typ.)
328 164 328 counts/ "H2O
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.
July 2007 / 588
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DSDXL Series
Digital pressure transducers
PERFORMANCE CHARACTERISTICS
The output signal is not ratiometric to the supply voltage (VS = 5.0 VDC, TA = 25C) DSDXL...D4D
Characteristics
Zero pressure offset Full scale span (FSS)2 Output at max. specified pressure at min. specified pressure Total accuracy (0 to 85C)3 Sample rate Response delay4 Startup time (power up to 1st result) Quantization step5 Current consumption
Min.
1966
Typ.
2048 3276
Max.
2130
Units
counts 3604 327 3686 410 3768 492 2.5 100 2.73 14.11 ms 40 3 6 counts mA %FSS Hz
DSDXL010D4R
Characteristics
Zero pressure offset Full scale span (FSS)2 Full scale output Total accuracy (0 to 85C)3 Sample rate Response delay4 Startup time (power up to 1st result) Quantization step5 Current consumption
Min.
327
Typ.
410 3277
Max.
492
Units
counts 3768 2.5 %FSS Hz 14.11 ms 40
3604
3686
100 2.73
3 6
counts mA
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DSDXL Series
Digital pressure transducers
INTRODUCTION
The DSDXL 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 DSDXL 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 DSDXL has a hard coded slave address (1111000xb), therefore it is not possible to access more than one DSDXL 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 DSDXL with a READ command: $F1. The DSDXL must not be accessed with a WRITE command ($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 DSDXL starts to send 2 data bytes containing the current pressure value placed in the output registers.
DIGITAL I2C INTERFACE
The DSDXL complies with the following protocol (FIG. 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 DSDXL
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DSDXL 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 I2C interface
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DSDXL Series
Digital pressure transducers
ELECTRICAL CONNECTIONS
Vs (pin 1) identifier
SCL N/C SDA N/C +Vs IC GND N/C
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.
PHYSICAL DIMENSIONS
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)
third angle projection
dimensions in mm (inches)
ORDERING INFORMATION
Pressure range
0...5 "H2O 0...10 "H2O 0...10 "H2O
Differential/Gage
D S D X L005D 4D D S D X L010D 4D D S D X L010D 4R
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. July 2007 / 588 6/6
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