AMS5105

AMS5105 ANALOGMICRO | Alldatasheet

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Pressure sensor with one analog and two switching outputs Analog Microelectronics GmbH An der Fahrt 13, D – 55124 Mainz May 2012 - Rev. 2.0 Phone:+49 (0)6131/91 0730-0 Fax: +49 (0)6131/91 073-30 Internet: www.analogmicro.de E–Mail: info@analogmicro.de

FEATURES

• Combined pressure sensor and switch
• Calibrated and temperature compensated
• Analog voltage output of 0.5 to 4.5V (ratiometric)
• Two programmable logic switching outputs of 0/5 V, configurable as normally open, normally close or in window mode
• Threshold, hysteresis and delay can be set individually for each switching output
• Differential/relative, bidirectional differential, absolute and barometric versions
• High accuracy up to 0.5% at RT
• Small overall error within a temperature range of -25 ... 85°C
• Supply voltage range 4.75…5.25V
• High long term stability
• Small DIP package
• Ready to use
• RoHS compliant TYPICAL APPLICATIONS
• Pressure measurement/control
• Vacuum measurement/control
• Process control
• Gas flow
• Fluid level measurement
• Medical instrumentation
• Heating, Ventilation and Air Conditioning (HVAC) GENERAL DESCRIPTION The pressure sensors/switches in the AMS 5105 series combine a high-precision OEM pressure sensor with a programmable pressure switch in one package. AMS 5105 has one analog voltage output and two independent logic switching outputs. The analog voltage output is ratiometric to the supply voltage of 5 V. The switching outputs are software configurable as normally open, normally closed or in window mode; thresholds and hysteresis can be set individually. The pressure sensors/switches are calibrated and compensated for across a temperature range of -25 to +85°C. AMS 5105 comes in a dual in-line package (DIP) for assembly on printed circuit boards (PCBs). The electrical connection is made via the DIP solder pins; pressure is connected via two vertical metal tubes. AMS 5105 is available for various applications and pressure ranges: differentia l (relative) devices in ranges from 0…5 mbar up to 0…7 bar, two absolute pressure variants for 0…1 bar and 0…2 bar and a barometric variant. Bidirectional differential devices are available in different ranges from -5…+5 mbar up to -1…+1 bar. Other pressure ranges or customized modifications are available on request.

Pressure sensor with one analog and two switching outputs May 2012 - Rev. 2.0 Page 2/8 www.analogmicro.de PRESSURE RANGES Sensor type (code) Pressure type Pressure range in mbar Burst pressure1) in bar Pressure range in PSI Burst pressure1) in PSI Ultra low pressure AMS 5105-0005-D AMS 5105-0010-D AMS 5105-0005-D-B AMS 5105-0010-D-B differential / relative differential / relative bidirectional differential bidirectional differential 0 … 5 0 … 10 -5 / +5 -10 / +10 >0.35 >0.35 >0.35 >0.35 0 … 0.0725 0 … 0.145 -0.0725 / 0.0725 -0.145 / +0.145 Low pressure AMS 5105-0020-D AMS 5105-0050-D AMS 5105-0100-D AMS 5105-0020-D-B AMS 5105-0050-D-B AMS 5105-0100-D-B differential / relative differential / relative differential / relative bidirectional differential bidirectional differential bidirectional differential 0 … 20 0 … 50 0 … 100 -20 / +20 -50 / +50 -100 / +100 >0.5 >0.5 0 … 0.290 0 … 0.725 0 … 1.450 -0.290 / +0.290 -0.725 / +0.725 -1.450 / +1.450 >7.5 >15 >15 >7.5 >15 >15 Standard pressure AMS 5105-0200-D AMS 5105-0350-D AMS 5105-1000-D AMS 5105-2000-D AMS 5105-4000-D AMS 5105-7000-D AMS 5105-0200-D-B AMS 5105-0350-D-B AMS 5105-1000-D-B AMS 5105-1000-A AMS 5105-2000-A AMS 5105-1200-B differential / relative differential / relative differential / relative differential / relative differential / relative differential / relative bidirectional differential bidirectional differential bidirectional differential absolute absolute barometric 0 … 200 0 … 350 0 … 1000 0 … 2000 0 … 4000 0 … 7000 -200 / +200 -350 / +350 -1000/ +1000 0 … 1000 0 … 2000 750 … 1200 15.5 15.5 15.5 0 … 2.901 0 … 5.076 0 … 14.50 0 … 29.01 0 … 58.02 0 … 101.5 -2.901 / +2.901 -5.076 / +5.076 -14.50 / +14.50 0 … 14.5 0 … 29.01 10.88 … 17.4 225 225 225 Table 1: AMS 5105 standard pressure ranges (other ranges on request) Notes: 1) Burst pressure is defined as the maximum pressure wh ich may be applied to one pressure port relative to the other port (or while only one pressure port is connected) without causing leaks in the sensor.

Pressure sensor with one analog and two switching outputs May 2012 - Rev. 2.0 Page 3/8 www.analogmicro.de MAXIMUM RATINGS Parameter Minimum Ty pical Maximum Units Maximum supply voltage: VS (max) Operating temperature: Top Storage temperature: Tamb Common mode pressure pCM -25 -40 6.0 125 V bar Table 2: Maximum ratings Notes: 1) The common mode pressure is defined as the maximum pr essure that can be applied on both pressure ports of a differential pressure sensor simultaneously without damaging the sensors housing. SPECIFICATIONS All parameters apply to VS = 5.0V and Top = 25°C, unless otherwise stated. Parameter Minimum Ty pical Maximum Units Analog output signal 1) @ specified minimum pressure (see Pressure range2) @ specified maximum pressure (see Pressure range2) Full span output (FSO) 3) without pressure (bidirectional differential) 0.5 4.5 2.5 V V V V Logic switching outputs 4) Output-Low-Level5) Output-High-Level5) Max. output current (switching outputs) Adjustable threshold (pth) Adjustable hysteresis (phys) Adjustable switching delay 100 100 p th 500 %VS %VS mA %p6) %p6) ms Accuracy 7) (analog output) @ T= 25°C Ultra low pressure sensors (5, 10mbar) Low pressure sensors (20, 50, 100 mbar) Standard pressure sensors ±1.5 ±1.0 ±0.5 %FSO %FSO %FSO Overall error 8) (analog output) @ T= -25...85°C Ultra low pressure sensors (5, 10mbar) Low pressure sensors (20, 50, 100 mbar) Standard pressure sensors ±2.0 ±1.5 ±1.0 %FSO %FSO %FSO Accuracy (switching outputs) @ T = 25°C Ultra low pressure sensors (5, 10 mbar) Low pressure sensors (20, 50, 100 mbar) Standard pressure sensors ±1.5 ±1.0 ±0.5 %FSO %FSO %FSO Overall error (switching outputs) @T = -25...85°C Ultra low pressure sensors (5, 10 mbar) Low pressure sensors (20, 50, 100 mbar) Standard pressure sensors ±2.0 ±1.5 ±1.0 %FSO %FSO %FSO

Pressure sensor with one analog and two switching outputs May 2012 - Rev. 2.0 Page 4/8 www.analogmicro.de Parameter Minimum Ty pical Maximum Units Long term stability <0.5 %FSO/a Supply voltage (VS ) 4.75 5 5.25 V Current consumption (switching outputs open) 9) 5 mA Resolution A/D converter (analog output) 14 bits Resolution D/A converter 11 bits Resolution analog output signal 0.05 %FSO Resolution of adjustment threshold10) 14 bit Resolution of adjustment hysteresis10) 14 bit Load resistance at analog output RL 2k Ω Capacitive load at analog output 50 nF Ratiometricity error (@VS = 4.75…5.25 V) 500 ppm Reaction time (10%...90% rise time) 1 2 ms Load resistance at analog output RL 2k Ω Start-up time (after power on) 5 ms Pressure changes 10 6 Compensated temperature range -25 85 °C Weight 3 g Media compatibility See "Specification notes" 11) 12) Table 3: Specifications SPECIFICATION NOTES 1) The analog voltage output signal is ratiometric to the supply voltage 2) See Table 1 3) The Full Span Output (FSO) is the algebraic differe nce between the output signal at the specified minimum pressure and the output signal at the specified maximum pressure (see "Pressure ranges"). 4) The two switching outputs (Switch 1 and Switch 2) are software configurable (with the AMS 5105 starter kit). The output modes can be set as normally open (NO), normally closed (NC) and to window mode. Thresholds and hysteresis can be set individually for each switching outpu t. The default factory configur ation of the two switching outputs is NO, with the thresholds set to 10% (Switch1) and 90% (Switch2). Hysteresis is set to 5% for both switching outputs. 5) Load resistance > 1 kOhm 6) 0%p refers to the specified minimum pressure and 100%p to the specified maximum pressure (see Table 3) 7) Accuracy is defined as the maximum deviation of the m easurement value from the ideal characteristic curve at room temperature (RT) in %FSO, including the adjus tment error (offset and span), nonlinearity, pressure hysteresis and repeatability. Nonlinearit y is the measured deviation from t he best fit straight line (BFSL) across the entire pressure range. Pressure hysteresis is the maximum deviation of the output value at any pressure within the specified range when this pressure is cycled to and from the minimum or maximum rated pressure. Repeatability is the maximum deviation of the output value at any pressure wi thin the specified range after 10 pressure cycles. 8) The overall error is defined as the maximum deviation of the measurement value from the ideal characteristic curve in %FSO across the entire temperature range (-25…85°C). 9) With active switching outputs the current consumption increases by the output currents of the switching outputs (see "Specifications/Logic switching outputs”). 10) With the AMS 5105 starter kit software an adju stment of 0.1 %p (see note 6) is possible. 11) Media compatibility of pressure port 1 (for a description of port 1, see Figure 3): clean, dry gases, non-corrosive to silicon, RTV silicone rubber, gold (alkaline or acidic liquids can destroy the sensor). 12) Media compatibility of pressure port 2 (for a description of port 2, see Figure 3): fluids and gases non-corrosive to silicon, Pyrex, RTV silicone rubber.

Pressure sensor with one analog and two switching outputs May 2012 - Rev. 2.0 Page 5/8 www.analogmicro.de FUNCTIONAL DESCRIPTION The pressure sensors/pressure switches in the AM S 5105 series combine a high-quality piezoresistive silicon sensing element with a modern, mixed-signal CMOS ASIC for signal conditioning with full digital correction on a ceramic substrate. This enables hi gh-precision measurements and excellent drift and long- term stability. The functional principle of the AMS 5105 is explained in Figure 1. The physical pressure is measured at AMS 5105's pi ezoresistive pressure sensing element where the pressure is converted into a differential voltage signal which is almost proportional to the pressure. This differential voltage signal is corrected and conditioned by the ASIC in multiple steps. Firstly, the differential voltage signal from the sens ing element is pre-amplified by the amplifier and transmitted by a multiplexer to the A/D converter (ADC). The ADC converts the signal into digital values with a resolution of 14 bits. The digitized signal is corrected and calibrated in the follow-on ASIC microcontroller. Factory precision calibration of AMS 5105 sets the sensor-specific correction coefficients and stores these in the EEPROM for each sensor. This permits sensor-specific calibration and correction (i.e. temperature compensation and linearization) of the digitized pres sure signal. The temperature signal necessary for temperature compensation is also measured at the pi ezoresistive measuring cell and is transmitted by the multiplexer to the ADC, where it is digitized. Th e ASIC microcontroller runs a cyclic program which continuously calculates the current standardized and corrected digital pressure values. To generate the analog output signal the corrected digital pressure value is converted into an analog voltage by an 11-bit D/A converter (DAC). The standardized analog output voltage (0.5…4.5 V) at the sensor's PIN 4 (VOUT) is ratiometric to the supply voltage. The logic output signals at the sensor's switching outputs PIN 8 (SWITCH 1) and PIN 7 (SWITCH 2) are generated by the ASIC's programmable comparator. This compares the corrected digital pressure value with the specific threshold and hyst eresis values programmed and st ored in the EEPROM. Depending on the selected configuration mode for the particular switching output the logic output signal is set to high or low. The configuration setting (normally open, normally closed or window mode) and the settings of the particular thresholds, hysteresis and delay for the two switching outputs are stored in the EEPROM. These settings are changed by programming with the AMS 5105 starter ki t via the sensor's programming interface at PIN 5 (SDA) and PIN 6 (SCL). ADC uC DAC EEPROM Buffer pressure sensing element TSig Amp MUX AMS 5105 Switch2 Switch1 VCC GND COMP SDA SCL SIF Programming Figure 1: Functional principle of AMS 5105

Pressure sensor with one analog and two switching outputs May 2012 - Rev. 2.0 Page 6/8 www.analogmicro.de INITIAL OPERATION The sensors are connected up electrically by mounting t hem on a PCB. The principle electric circuitry of AMS 5105 with one analog and two switching outputs in use is shown in Figure 2. For single use of the analog output it is sufficient to connect up PIN 2 (VCC), PIN 3 (GND) and PIN 4 (OUT). In applications with a low switching current (< 4mA) it is possible to connect the logic switching outputs PIN 8 (SWITCH1) and PIN 7 (SWITCH2) dire ctly to the load (referenced to VC C or GND). For greater switching currents (i.e. when driving a relay) or if higher volt ages are to be switched (> Vcc), an external power transistor is necessary, such as an intelligent powe r FET (e.g. a PROFET ISP452 as shown in the example at PIN 7 in Figure 2) or a power Darlington transistor (i.e. a TIP121). PIN 5 and PIN 6 are for programming AMS 5105 only (conf iguration of the switching outputs and adjustment of the thresholds and hysteresis) using the starter kit (see section "Additional Equipment"). The pressure connection is made using the two metal pressure ports (hose conne ctors) on top of the AMS 5105. Depending on the type of AMS 5105 and the measurin g pressure, either one or two of the pressure ports are connected up to the measuring media/volume. For the pressures at port 1 and port 2 (for definition see Figure 3) the following requirements have to be fulfilled (according to the definition p1 = pressure at port 1 and p2 = pressure at port 2): Differential/relative pressure sensors: p 1 > p2 Bidirectional differential sensors: p 1 > p2 or p1 < p2 possible. Absolute pressure sensors, barometric sensors: p 1 = measuring pressure. Notes: 1. The guidelines governing media compatibility must be taken into account here (see "Specification notes"). 2. For pressure connections up to 2 bar Analog Micr oelectronics recommends a silicone tubing (inner diameter Ø=2mm, outer diameter Ø=6mm). 3. ESD precautions are necessary, it is essential to ground machines and personnel properly during assembly and handling of the device Configuring switching outputs By factory programming the two switching outputs are se t to standard configuration (see specification note 6). Using the relevant starter kit (see section Addi tional Equipment) the customer can select the basic switching function (off, normally open, normally closed, window mode) and adjust the specific threshold, hysteresis and a delay for each switching output. For a detailed description of the switching functions and the possible adjustments see the document “User Guide USB Starter Kit AMS 5105”. AMS 5105 OUT GND VCC SWITCH1 SWITCH2 Voltage Supply 5 6 BSP 452 24V Load RL Figure 2: Principle electric circuitry (example) ISP 452

Pressure sensor with one analog and two switching outputs May 2012 - Rev. 2.0 Page 8/8 www.analogmicro.de INFORMATION FOR ORDERING Ordering code: Pressure range: Pressure range code mbar PSI kPa 0005 5 0.073 0.5 0010 10 0.145 1.0 0020 20 0.290 2.0 0050 50 0.725 5.0 0100 100 1.450 10 0200 200 2.901 20 0350 350 5.076 35 1000 1000 14.50 100 1200 1200 17.40 120 2000 2000 29.01 200 4000 4000 58.02 400 7000 7000 101.5 700 Table 4: Pressure ranges Pressure type: Pressure type code Available pressure ranges D differential / relative (gage) 0…5 mbar to 0…7 bar D-B bidirectional differential -5 / +5 mbar to -1000 / +1000 mbar A absolute 0…1000 mbar B barometric (absolute) 700…1200 mbar Table 5: Pressure types ADDITIONAL EQUIPMENT A starter kit with software is available for AMS 5105 pressure sensors. Using a standard PC with an USB- port the starter kit permits easy configuration and adjustm ent of the two switching outputs. Together with the relevant software the customer can configure the two independent switching outputs of the AMS 5105 as normally open, normally close or in window mode and c an adjust the specific thresholds, hysteresis and switching delays for both switching outputs individually. Ordering code Description USB starter kit AMS 5105 AMS 5105 - starter kit (2 PCBs with software) Analog Microelectronics GmbH reserves the right to amend any dimensions, technical data or other information contained herein without prior notification. AMS 5105-0100-D Model Pressure range Pressure type