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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

Name Type Description Version Language
PS09_AN000245_1-00.pdf Application Note Piezo-resistive sensors 1-00 English
PS09_AN000246_1-00.pdf Application Note EMI Countermeasures 1-00 English
PS09_BD000322_1-00.png Block Diagram PS09 Block Diagram 1-00 English Datasheet Volumes 1+2; 1.0 / 1.0 1-00 English
PCAPx_TDC-GPx_PS09_PD000176_1-00.pdf Other Product Document Change Notification_MOQ Amendment_PCAPx_TDC-GPx_PS09FN (issued 2017-Mar) 1-00 English
PS09_PD000326_1-00.png Other Product Document PS09EvalKit Image 1-00 English
PS09_UG000264_1-00.pdf User Guide Digital load cell PCB 1-00 English
PS09_UG000263_1-00.pdf User Guide Evaluation system 1-00 English

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