PVC4001

PVC4000 Series MEMS PIRANI VACUUM TRANSDUCER 131 E. Brokaw Road | San Jose CA 95112 | +1 (408) 392-0989 | info@posifatech.com | www.posifatech.com DESCRIPTION The PVC4000 series is a vacuum transducer designed for cost-effective OEM integration. It consists of a MEMS thermal conduction sensor (Pirani sensor), measuring electronics, and a microprocessor, packaged in a ultra-compact PCB assembly The sensor element is based on Posifa's proven, second-generation MEMS thermal conduction chip that operates under the principle that the thermal conductivity of gases is proportional to its vacuum pressure. The electronics and microprocessor amplify and digitize the sensor signal, and provide the output via an I2C interface. Because thermal conductivity of vacuum varies with the ambient temperature, a temperatrue compensation algorithm is implemented in the microprocessor, taking input from a built-in temperatuer sensor. To prevent signal drift due to sensor chip selheating, the microprocessor includes a pulsed excitation scheme whereby the sensor chip is heated for about 100 ms and then turned off for one second. Output from PVC4000 is uncalibrated. As an option, users of PVC4000 can choose to input up to ten pairs of calibration points via the I2C interface into the microprocessor. A built-in piecewise linearization algorithm will leverage this data to provide calibrated output. To further facilitate integration PVC4000 includes connector-terminated wire harness that is soldered onto the PCB assembly. FEATURES • Range: 0.001 to 760 Torr (0.13 to 101K Pa) • Fast Response Time < 1.2 s • Low power consumption for battery-powered instruments • Temperature compensation • Pulsed sensor excitation to prevent signal drift in high vacuum • Piecewise linearization algorithm and I2C interface for storing calibration data (optional) • Resistant to contamination APPLICATIONS • Leak detection in any closed system maintained under primary vacuum, such as in Vacuum Insulated Panels • Portable digital vacuum gauges ABSOLUTE MAXIMUM RATINGS • • • • Operating Temperature: -25 to 85 °C Storage Temperature: -40 to 90 °C Shock: 100 g peak (5 drops, 3 axis) Overpressure: 27.5 bar Datasheet_PVC4000_Vacuum_RevA_C0.99 | Apr 2021 | PAGE 1 OF 1 PVC4000 Series MEMS PIRANI VACUUM TRANSDUCER 131 E. Brokaw Road | San Jose CA 95112 | +1 (408) 392-0989 | info@posifatech.com | www.posifatech.com ELECTRICAL CHARACTERISTICS Test Conditions: Vdd = 3.3 Vdc, Ta=21°C SPECIFICATIONS MIN TYP MAX UNIT 760000 Micron CONDITIONS Range 1 Output 13500 17500 20000 Count At 760000 Micron 37000 40800 44000 Count At 30 Micron Sensitivity Temperature Drift Response Time Supply Voltage 8 Count/Micron 1 to 1000 Micron 1.6 Count/Micron 1000 to 5000 Micron 0.5 Count/Micron 5000 to 10000 Micron 0.15 Count/Micron 10000 to 25000 Micron 5 Count/oC 1.2 s 2.7 Operating Current 5.5 11 0 to 40oC Vdc mA Operating Temperature Range -25 85 °C Storage Temperature -40 90 °C When heater is turned on Note: 1. Sensor output is not calibrated. Datasheet_PVC4000_Vacuum_RevA_C0.99 | Apr 2021 | PAGE 2 OF 5 PVC4000 Series MEMS PIRANI VACUUM TRANSDUCER 131 E. Brokaw Road | San Jose CA 95112 | +1 (408) 392-0989 | info@posifatech.com | www.posifatech.com TYPICAL OUTPUT CURVE Vdd = 3.3, Ta = 21°C Pressure Output Pressure Output Pressure Output 760000 17135 5493 24650 83 38630 300000 17280 3017 27350 46 39090 100000 17765 1657 30150 25 39360 24560 19670 910 32750 10 39560 10000 22300 500 35050 8 39595 7411 23450 204 37530 5 39630 LOW-POWER OPERATION For battery-powered instruments that require further reduction in power consumption we recommend powering PVC4000 in an intermittent mode: 1. turn on PVC4000 2. Wait for 150 millisecond 3. Read from the I2C interface 4. Turn off PVC4000 5. Wait for 1 second, and repeat from Step 1 Datasheet_PVC4000_Vacuum_RevA_C0.99 | Apr 2021 | PAGE 3 OF 5 PVC4000 Series MEMS PIRANI VACUUM TRANSDUCER 131 E. Brokaw Road | San Jose CA 95112 | +1 (408) 392-0989 | info@posifatech.com | www.posifatech.com PACKAGE DIMENSIONS PVC4000 654321 Top Buttom 6 Side Pad/Wire# Description (Wire Color) 1 Vdd (Red) 2 GND (Black) 3 SDA (Yellow) 4 SCL (Green) 5 ICPCK (for firmware update) (Blue) 6 ICPDA (for firmware update) (White) Note: PVC4000 comes with a wire harness that is soldered onto the PCB. The length is 56mm (2.2 inch). The wire hearness is terminated with a Molex connector P/N 51021-0600. Datasheet_PVC4000_Vacuum_RevA_C0.99 | Apr 2021 | PAGE 4 OF 5 PVC4000 Series MEMS PIRANI VACUUM TRANSDUCER 131 E. Brokaw Road | San Jose CA 95112 | +1 (408) 392-0989 | info@posifatech.com | www.posifatech.com ORDERING INFORMATION PART NUMBER PVC4001 SPECIFICATIONS 10-3 to 760 Torr, SMD sensor Please contact Posifa or your local distributor to place an order. EUROPEAN DISTRIBUTOR BS-rep GmbH Eichertstr. 68, D-56745 Weibern, Germany Tel: +49 (0) 2655 / 96 26 476 Email: info@sensor-rep.de Datasheet_PVC4000_Vacuum_RevA_C0.99 | Apr 2021 | PAGE 5 OF 5