ASDX Series Silicon Pressure Sensors DESCRIPTION The ASDX Series is a Silicon Pressure Sensor offering either These sensors are available to measure absolute, differential 2 an I C or SPI digital interface for reading pressure over the and gage pressures. The absolute versions have an internal specified full scale pressure span and temperature range. vacuum reference and an output value proportional to absolute pressure. Differential versions allow application of pressure to The ASDX is fully calibrated and temperature compensated for either side of the sensing diaphragm. Gage versions are sensor offset, sensitivity, temperature effects and non-linearity referenced to atmospheric pressure and provide an output using an on-board Application Specific Integrated Circuit proportional to pressure variations from atmosphere. (ASIC). Calibrated output values for pressure are updated at approximately 1 kHz. The ASDX Series sensors are intended for use with non- corrosive, non-ionic working fluids such as air and dry gases. The standard ASDX is calibrated over the temperature range They are designed and manufactured according to standards of 0 C to 85 C 32 F to 185 F . The sensor is characterized in ISO 9001. for operation from a single power supply of either 3.3 Vdc or 5.0 Vdc. FEATURES POTENTIAL APPLICATIONS 2 Output options: I C- or SPI-compatible 12-bit digital Flow calibrators Precision ASIC conditioning and temperature Ventilation and air flow monitors compensated over 0 C to 85 C 32 F to 185 F Gas flow instrumentation temperature range Sleep apnea monitoring and therapy equipment Low operating voltage Barometry Absolute, differential and gage types Pneumatic controls Pressure ranges from 10 inches H O to 100 psi HVAC 2 Standard calibrations in inches H O, cm H 0, psi, mbar, 2 2 bar, kPa Total error band of 2.0% of full scale span maximum RoHS compliant ASDX Series Silicon Pressure Sensors 1 Table 1. Absolute Maximum Ratings Parameter Min Max Unit Supply voltage (Vsupply) -0.3 6.0 Vdc Voltage to any pin -0.3 Vsupply + 0.3 Vdc Digital clock frequency: 2 I C 100 400 kHz SPI 50 800 ESD susceptibility (human body model) 3 kV Storage temperature -50 -58 125 257 C F Lead temperature (2 s to 4 s) 250 482 C F 2 External capacitance between Vsupply and ground 100 470 nF Table 2. Operating Specifications Parameter Min. Typ. Max. Unit 3 Supply voltage: (Vsupply) 4 3.3 Vdc 3.0 3.3 3.6 Vdc 4 5.0 Vdc 4.75 5.0 5.25 Sensors are either 3.3 Vdc or 5.0 Vdc per the Order Guide (see Figure 1). Supply current 2.0 3.5 5.0 mA 5 Compensated temperature range 0 32 85 185 C F 6 Operating temperature range -20 -4 105 221 C F 7 Overpressure 2X operating pressure range minimum 8 Burst pressure 3X operating pressure range minimum Startup time (power up to data ready) 2.8 7.3 ms Response time 0.46 ms 2 I C or SPI voltage level low 0.2 Vsupply 2 I C or SPI voltage level high 0.8 Vsupply 2 Pull-up on SDA and SCL (I C output only) 1 kOhm 9 10 Total error band 2.0 %FSS Output resolution 12 bits Table 3. Environmental Specifications Parameter Characteristic Humidity 0% to 95% RH non-condensing Vibration 10 G at 20 Hz to 2000 Hz Shock 100 G for 11 ms Life 1 million cycles minimum 11 Table 4. Wetted Materials 12 12 Parameter Port 1 (Pressure Port) Port 2 (Reference Port) Covers glass-filled PBT glass-filled PBT Adhesives silicone silicone and epoxy Electronic components silicon and glass silicon, glass, and gold Notes: 1. Absolute maximum ratings are the extreme limits that the device will withstand without damage to the device. 2. An external bypass capacitor is required across the supply voltage (Pins 6 and 3 see Figure 4) as close to the sensor supply pin as possible for correct sensor operation. 3. Ratiometricity of the sensor (the ability of the output to scale to the input voltage) is achieved within the specified operating voltage for each option. Other custom supply voltages are available, please contact Honeywell Customer Service. 4. The sensor is not reverse polarity protected. Incorrect application of excitation voltage or ground to the wrong pin may cause electrical failure. 5. The compensated temperature range is the temperature range (or ranges) over which the sensor will produce an output proportional to pressure within the specified performance limits. 6. The operating temperature range is the temperature range over which the sensor will produce an output proportional to pressure but may not remain within the specified performance limits. 7. Overpressure is the maximum pressure which may safely be applied to the product for it to remain in specification once pressure is returned to the operating pressure range. Exposure to higher pressures may cause permanent damage to the product. 8. Burst pressure is the maximum pressure that may be applied to any port of the product without causing escape of pressure media. Product should not be expected to function after exposure to any pressure beyond the burst pressure. 9. Total error band is the maximum deviation in output from ideal transfer function over the entire compensated temperature and pressure range. Includes all errors due to offset, full scale span, pressure non-linearity, pressure hysteresis, repeatability, thermal effect on offset, thermal effect on span and thermal hysteresis. Specification units are in percent of full scale span (%FSS). 10. Full scale span (FSS) is the algebraic difference between the output signal measured at the maximum (Pmax.) and minimum (Pmin.) limits of the pressure range. 11. Consult Honeywell Customer Service for detailed material information. 12. For AC pressure port configuration, the pressure and reference ports are reversed. 2 sensing.honeywell.com