SM7291 / SM7391 / SM7491
The SOIC pressure sensors in the SM7X91 series are analog/digital OEM sensors* with a new silicon sensing element and modern electronic signal conditioning unit. The integrated digital signal processor permits calibration and temperature compensation during production.
The fully calibrated SM7291/SM7391/SM7491 sensors are supplied in a standard SOIC16 package with two vertical pressure connectors for SMD assembly. Pressure-proportional information in I2C format or as an analog 0.5 – 4.5 V voltage signal acts as an output signal. SM7291/SM7391/SM7491 are autonomous sensors which do not require any additional circuitry.
These SOIC pressure sensors are suitable for reflow soldering and automatic assembly on a PCB.
The sensor is available in a relative SM7291 or differential SM7391 sensor version or as asymmetrical, bidirectional, differential pressure sensor SM7491.
Variants of SM7291/SM7391/SM7491
SM7291 relative pressure ranges: 0 – 0.07 / 0.29 psi
SM7391 differential pressure ranges:
P1: -0,29 – -0,07 psi and P2: 0,07 – 0,29 psi (the absolute values of P1 and P2 must be identical. Please see the datasheet.)
SM7491 bidirectional, asymmetrical pressure ranges:
P1: -0.29 – 0 and P2: 0 – 0.29 psi
Link to the pressure converter
AMSYS provides the SOIC sensors in the SM7X91 series as standard versions. The following specifications thereof can be customized, however.
Features
- Relative, differential and asymmetrical, bidirectional pressure: ±0.29 psi
- Compensated temperature range: -40–105°C
- Supply voltage: 3.3 V/5 V
- Calibrated digital output signal in I²C format
- Calibrated analog voltage signal
- Resolution of 16 bits
- Accuracy: ±1% FS digital, ±1.5% analog
- Digital ASIC signal processor
- SOIC16 package for SMD assembly
- ISO & ISO/TS certified
- RoHS and REACH compliant
Applications
- Respiratory control
- Devices for negative pressure wound therapy
- HVAC
- Fan control
- Gas flows
- Airstream measurement
Downloads
- SM7X91 OEM pressure sensor datasheet
- Application note 505: AMS 4712 – What to know about bidirectional differential pressure sensing(also applies to the SM7X91)
- Application note 511: AMS 5812 – OEM pressure sensor with analog and digital output (also applies to the SM7X91)
- Application note 1702: Digital data exchange with pressure sensors from SMI for I²C users
- Application note 1703: I2C communication with SMI protocol-A
- White paper 03: How to measure differential pressure using piezoresistive sensing elements
For information on prices and delivery times or if you have any technical questions, please contact info@amsys-sensor.com.