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 ELECTRICAL CONNECTION Maximum ratings N/C Supply voltage VS +Vs 4.75 V to 5.25 VDC max. 6.50 VDC 6 Lead temperature (2 - 4 sec.) 1 250°C 5 Temperature ranges Compensated Operating Storage CSDX 0 to +85°C -20 to +105°C -40 to +125°C 2 10 g at 20 - 2000 Hz Shock Application of supply voltage above the maximum can cause electrical failure. February 2009 / 632 3 N/C Note: Incorrect applications of excitation voltage or ground to the wrong pin can cause electrical failure. 220 nF IC GND 100 g for 11 ms Caution! The sensor is not reverse polarity protected. SDA 15 nF 8 4 Vibration 7 SCL 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! 1/7 www.sensortechnics.com CSDX Series Digital pressure transducers PRESSURE RANGES SPECIFICATIONS (VS = 5.0 VDC, TA = 25°C) Part number Pressure range CSDX0811BARO 800 to 1100 C S D X 1000A 2R 0 to 1 mbar(a) Burst pressure1 2 2 bar (a) 10.7 bar (a) 3.2 C S D X 2000A 2R 0 to 2 C S D X 5000A 2R 0 to 5 10 0.6 C S D X 0025D 4R 0 to 25 0.2 128 CSDX0050G2R / D4R 0 to 50 0.35 64 0.35 32 mbar (g,d) 4 Sensitivity (typ.) 1.6 CSDX0100G2R / D4R 0 to 100 CSDX0250G2R / D4R 0 to 250 1 CSDX0500G2R / D4R 0 to 500 1 CSDX1000G2R / D4R 0 to 1 2 3.2 CSDX2000G2R / D4R 0 to 2 4 1.6 CSDX5000G2R / D4R 0 to 5 10 0.6 C S D X 0010D 4D 0 to ±10 0.2 160 C S D X 0025D 4D 0 to ±25 0.2 64 C S D X 0050D 4D 0 to ±50 bar (g,d) mbar (d) bar (g,d) 0.35 6.4 counts/ mbar 32 bar (d) C S D X 0100D 4D 0 to ±100 C S D X 0250D 4D 0 to ±250 1 6.4 C S D X 0500D 4D 0 to ±500 1 3.2 C S D X 1000D 4D 0 to ±1 2 1.6 bar(d) 0.35 12.8 16 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. February 2009 / 632 2/7 www.sensortechnics.com CSDX Series Digital pressure transducers PERFORMANCE CHARACTERISTICS The output signal is not ratiometric to the supply voltage (VS = 5.0 VDC, TA = 25°C) All CSDX...R and CSDX0811BARO Characteristics Offset at lowest specified pressure CSDX0025... CSDX0050... CSDX0811BARO all others Min. Typ. Max. 368 400 432 384 400 416 2 Full scale span (FSS) Full scale output counts 3200 3 Total accuracy (0 to 85°C) CSDX0025... CSDX0050... CSDX0811BARO all others CSDX0025... CSDX0050... CSDX0811BARO all others 3568 3600 3632 3584 3600 3616 ±1.0 %FSS ±0.5 Sample rate 100 Response delay4 2.73 Hz 14.11 Startup time (power up to 1st result) Quantization step5 Units 40 CSDX0811BARO 4 all others 2 Current consumption ms counts 6 mA All CSDX...D Characteristics Zero pressure offset Full scale span (FSS)2 Output at max. specified pressure at min. specified pressure Total accuracy (0 to 85°C)3 Sample rate CSDX0010... CSDX0025... CSDX0050... all others Min. Typ. Max. 1968 2000 2032 2000 2016 1984 3200 CSDX0010... CSDX0025... CSDX0050... all others CSDX0010... CSDX0025... CSDX0050... all others CSDX0010... CSDX0025... CSDX0050... all others 3568 3600 3632 3584 3600 3616 368 400 432 384 400 416 ±1.0 Response delay counts %FSS ±0.5 100 4 Units Hz 2.73 14.11 Startup time (power up to 1st result) 40 ms Quantization step5 2 counts Current consumption 6 mA February 2009 / 632 3/7 www.sensortechnics.com 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 I²C-bus. 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. According to the I²C-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. 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. The I²C-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 I²C-bus line. DIGITAL I2C INTERFACE 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). 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. DATA operation: The CSDX starts to send 2 data bytes containing the current pressure value placed in the output registers. SCL SDA START condition Data valid 1 S Slave Address R/W A Data allowed to change Data Byte 1 A STOP condition Data Byte 2 S Slave Address Read out of pressure value generated by master generated by slave P Next command S = START condition Data Byte 1 = High Byte (MSB first) A = Acknowledge Data Byte 2 = Low Byte (LSB last) P = STOP condition FIGURE I: I²C-BUS Protocol of CSDX February 2009 / 632 4/7 www.sensortechnics.com CSDX Series Digital pressure transducers I2C INTERFACE PARAMETERS Parameter Symbol 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 Conditions Min. Typ. 90 0 (open drain, IOL = -4 mA) (pins SCL and SDA) Max. 100 10 10 20 400 100 5 Unit % of Vs µA pF kHz FSC L --- tBUF 4.7 µs 4.0 µs tLOW tHIGH 4.7 4.0 µs µs tSU;STA 4.7 µs tHD;DAT tSU;DAT 0 250 ns ns tR --- 300 ns tF --- 300 ns tSU;STO 4 to first clock pulse tHD;STA tSP tSU;DAT µs sp i ke s o n S D A o r S C L o f that length are suppressed tHD;DAT 50 tSU;STA tHD;STA tR tSU;STO tBUF tHD;STA ns tF SCL SDA tHIGH tLOW SCL SDA FIGURE II: Timing characteristics of the I²C interface February 2009 / 632 5/7 www.sensortechnics.com 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) High pressure port 2.29 (0.090) 3.38 (0.133) 8.13 8.89 (0.350) (0.320) 8.26 typ (.325 typ) Low pressure port 0.51 typ (0.02 typ) 1.78 (0.070) 2.54 typ (0.100 typ) 16.64 ±0.64 (0.655 ±0.025) 4.5 (0.177) 6.99 (0.275) G2 package 3.15 (0.124) 1.27 typ (0.050 typ) 13.97 (0.550) 16.89 (0.665) 4.9 (0.193) 2 ° typ 1.19 typ (0.047 typ) 2.29 typ (0.090 typ) 2.79 typ (0.11 typ) 8.89 5.08 (0.350) (0.200) 0.51 typ (0.02 typ) 16.64 ±0.64 (0.655 ± 0.025) 4.5 (0.177) 2.54 typ (0.100 typ) A2 package 16.89 (0.665) 8.46 (0.333) 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) 16.64 ±0.64 (0.655 ±0.025) third angle projection February 2009 / 632 4.5 (0.177) 0.51 typ (0.02 typ) 2.54 typ (0.100 typ) dimensions in mm (inches) 6/7 www.sensortechnics.com CSDX Series Digital pressure transducers ELECTRICAL CONNECTIONS CSDX...D4... Vs (pin 1) identifier Vs (pin 1) identifier +Vs IC GND N/C SCL N/C SDA N/C +Vs IC GND N/C CSDX...A2R, CSDX...BARO SCL N/C SDA N/C CSDX...G2R Vs (pin 1) identifier SCL N/C SDA 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. +Vs IC GND N/C 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 Differential/Gage CSDX0811BARO C S D X 1000A 2R C S D X 2000A 2R C S D X 5000A 2R CSDX0050G2R CSDX0100G2R CSDX0250G2R CSDX0500G2R CSDX1000G2R CSDX2000G2R CSDX5000G2R 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 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 www.sensortechnics.com