Features Applications n 3.3 volt supply Industrial: n HVAC systems 2 n Compensated digital output (IC) n Process monitoring n Ultra-low pressure sensing (250 Pa) n Packaging automation n Gauge and differential types **Medical Devices (low/medium risk): n For use in clean, dry air and non-corrosive n Diagnostic equipment gas environments n Analysis equipment n RoHS compliant* BPS125 Series - 12 mm Digital Low Pressure Sensor Additional Information Electrical Characteristics Supply Voltage (V ) ...........................................3.0 V minimum, 3.3 V typical, 3.6 V maximum s Click these links for more information: Supply Current 3.3 V ...............................1.2 mA minimum, 2 mA typical, 3.5 mA maximum PRODUCT TECHNICAL INVENTORY SAMPLES CONTACT LIBRARY Performance Characteristics Operating Temperature ................................................................................................................................... -40 C to +85 C (-40 F to +185 F) Storage Temperature ....................................................................................................................................-55 C to +100 C (-67 C to +212 F) Pressure Range.......................................................................................... 250 to 500 Pa, 0.15 to 1.0 PSI (1 H O to 2 H O, 1.03 to 6.89 kPa) 2 2 2 (1) Output ..................................................................................................................................................................................................Digital I C Effective ADC Resolution ................................................................................................................................................................................13 bit Accuracy 25 C .................................................................................................................................................................................0.25 % FS Total Error Band over 0 C to 60 C (+32 F to +140 F) ........................................................................................................................ 1.5 % FS Long Term Stability ................................................................................................................................................................................. 0.5 % FS Startup Time .................................................................................................................................................................................. 15 ms maximum Digital Update Time ............................................................................................................................................................................8.5 ms typical Proof Pressure....................................................................................................................................................................... 5X full scale pressure Burst Pressure ................................................................................................................................................................................................ 10 psi (1) 2 I C address is set to (0x28). Alternative addresses are available. Consult the factory for custom options. Product Characteristics Media Compatibility .........................................................................................................................................................Non-corrosive dry gasses Moisture Sensitivity Level .......................................................................................................................................................................................2 ESD Classification (HBM) ..................................................................................................................................................................................2 kV Marking ..................................................................................Partial model number, media compatibility, pressure type, pressure rating, lot code Standard Packaging ............................................................................................................................................................... 250 pcs./13-inch reel Weight .................................................................................................................................................................................1.307 grams (0.046 oz) Transfer Function Formula Basic Circuit Schematic 1 P 0.1 Max counts P = (P P ) + P psi max min min V ( ) s 0.8 Max Where P = Measured Pressure in PSI psi SCL 8 DIGITAL P = Pressure Counts counts OUT SDA 7 P = Minimum Pressure min SSC P = Maximum Pressure max Max = 16384 = 14 Bits Consult factory for custom options such as supply voltage, GND temperature calibration range, output range accuracy specification, and update rate. 4 Note: Power supply decoupling included. WARNING Cancer and Reproductive Harm - www.P65Warnings.ca.gov * RoHS3 Directive 2015/863 Amendments of Annex II on March 31, 2015 ** Bourns products have not been designed for and are not intended for use in lifesaving, life-critical or life-sustaining applications nor any other applications where failure or malfunction of the Bourns product may result in personal injury or death. See Legal Disclaimer Notice on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.BPS125 Series - 12 mm Digital Low Pressure Sensor 3312 - 2 mm SMD Trimming Potentiometer 2 I C Parameters SCL Clock Frequency f ...............................................................................................................................................................100 to 400 kHz SCL Start Condition Hold Time Relative to SCL Edge t ...............................................................................................................................0.1 s HDSTA 1 Minimum SCL Clock Low Width t ..........................................................................................................................................................0.6 s LOW 1 Minimum SCL Clock High Width t .........................................................................................................................................................0.6 s HIGH Start Condition Setup Time Relative to SCL Edge t .............................................................................................................................0.1 s SUSTA Data Hold Time on SDA Relative to SCL Edge t ..................................................................................................................................0.0 s HDDAT Data Setup Time on SDA Relative to SCL Edge t ................................................................................................................................0.1 s SUDAT Stop Condition Setup Time on SCL t ...................................................................................................................................................0.1 s SUSTO Bus Free Time Between Stop Condition and Start Condition t ...................................................................................................................2 s BUS 1 Combined low and high widths must equal or exceed minimum SCLK period. 2 I C Parameters 2 I C Communication Communication to the Model BPS125 is read only. To read the pressure counts, the master performs a read request by asserting a start condition, sending the 7-bit address of the part (0x28), and sets the read/write bit. The master then waits for an acknowledgement. The acknowledgement is sent by the pressure sensor along with 2 bits of status and bits 13:8 of the pressure counts, the master acknowledges the first 8 bits, and the pressure sensor sends the remaining 8 bits of data. The master then does not acknowledge and sends a stop condition, signaling the end of the transaction. Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.