PS09 Resistance-to-Digital Converter

System on chip for strain gauge applications


  • RMS noise 11nV SINC5, 5Hz
  • Up to 80000 peak-peak divisions (2mV/V strain)
  • Scalable udapte rate from <1Hz to 10000Hz
  • Resolution: 28-bit ENOB (RMS)
  • 24-bit internal microprocessor with 8kB OTP
  • 4-wire serial SPI interface
  • Current consumption ~7µA PS09 itself at low current configuration
  • Power supply voltage: 2.1V to 3.6V


  • Small and compact solution for weighing applications
  • Converter and microcontroller in one chip
  • Perfectly suited for building digital load cells and consumer scales
  • Extreme low total system current (down to 15μA including strain gages)
  • Very low self heating of the sensor
  • Gain and offset correction of the load cell

Product parameters

Half Bridges 4
Noise [nV@5V] 19
Max. Rate 10000
Operating Supply Range [V] 2.1 to 3.6
Interface SPI, I²C, UART
CPU 24-bit
Memory 8k OTP
Ambient Temperature Range [°C] -40 to +125
Package QFN40

General Description

The PSØ9 is a system on chip for ultra low power and high resolution applications. It was designed especially for weight scales but fits also to any kind of force, pressure or torque measurements based on metal strain gauges. It takes full advantage of the digital measuring principle of PICOSTRAIN. Thus, it combines the performance of a 28-bit converter with a 24-bit microprocessor.

This product suits for the following applications:

  • Force sensors
  • Pressure sensors
  • Scales
  • Digital load cells
  • Torque wrenches
  • Precision temperature measurement
  • Legal for trade scales
  • Counting scales


Title Category Headline Buy
PS09EvalKit Application Board Evaluation Kit for PS09

Technical Documents

Type Description Language
Datasheet Volumes 1+2; 1.0 / 1.0 English
Application Note EMI Countermeasures English
Application Note Piezo-resistive sensors English


Type Description Language
Product Change Notification Change Notification_MOQ Amendment_PCAPx_TDC-GPx_PS09FN (issued 2017-Mar) English
Product Change Notification CN13-2017 (PCAP0x, TDC-GPxx, PS09) English

Other Information

Type Description Language
Block Diagram PS09 Block Diagram English
Factsheet Checking Torque with high Precision English

Ownership of this product has moved to Sciosense

Please be informed that this product is now owned by Sciosense B.V., a joint venture of ams AG and Wise Road Capital, effective January 13th, 2020.

ScioSense Environmental Sensors