SM4291 / SM4391 / SM4491 analog-digital pressure sensor
SM4291 / SM4391 / SM4491
The SOIC pressure sensors in the SM4X91 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 SM4291/SM4391/SM4491 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 0.6–5.4-V voltage signal acts as an output signal. SM4291/SM4391/SM4491 are autonomous sensors which do not require any additional circuitry.
SM4291/SM4391/SM4491 are suitable for reflow soldering and automatic assembly on a PCB.
The sensor is available in a relative SM4291 or differential SM4391 sensor version or as asymmetrical, bidirectional, differential pressure sensor SM4491.
Variants of SM4291 / SM4391 / SM4491
SM4291 relative pressure ranges:
0 – 2.5 / 14.9 psi
SM4391 differential pressure ranges:
P1: -14.9 – -2.5 and P2: 2.5 – 14.9 psi (the absolute values of P1 and P2 must be identical. Please see the datasheet.)
SM4491 bidirectional, asymmetrical pressure ranges:
P1: -14.9 – 0 and P2: 0 – 14.9 psi (the absolute values of P1 and P2 may differ from one another. The difference between P1 and P2 must be greater than 2 psi, however. Please see the datasheet.)
Link to the pressure converter
AMSYS provides the SOIC sensors in the SM4X91 series as standard versions. The following specifications thereof can be customized, however.
Features
- Relative, differential and asymmetrical, bidirectional pressure: ±14.9 psi
- 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
- HVAC
- Fan control
- Gas flows
- Airstream measurement
Downloads
- SM4X91 OEM pressure sensor datasheet
- Application note 505: AMS 4712 – What to know about bidirectional differential pressure sensing(also applies to the SM4X91)
- Application note 511: AMS 5812 – OEM pressure sensor with analog and digital output (also applies to the SM4X91)
- 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.