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PS081 Resistance-to-Digital Converter

System on chip for strain gauge applications

Features

  • RMS noise 8.9nV SINC5, 5Hz
  • Up to 250000 peak-peak divisions (2mV/V strain)
  • Scalable udapte rate from <1Hz to 1000Hz
  • Resolution: 28-bit ENOB (RMS)
  • 24-bit internal microprocessor with 2 kB EEPROM
  • Internal LCD controller for 4x14, 3x15 and 2x16 segments
  • 4-wire serial SPI interface
  • Current consumption ~5µA PS081 itself at low current configuration
  • Power supply voltage: 2.1V to 3.6V

Benefits

  • ƒSingle-chip solution for weighing applications
  • Converter, microcontroller and LCD controller in one chip
  • ƒƒExtreme 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] 11.5
Max. Rate 1000
Operating Supply Range [V] 2.1 to 3.6
Interface SPI
CPU 24-bit
Memory 2k EEPROM
GPIO 21
Ambient Temperature Range [°C] -40 to +125
Package QFN56

General Description

The PSØ81 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 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 signal converter with a 24-bit microprocessor. Additional elements like an LCD driver, 3K ROM with many complex pre-defined functions, 2k EEPROM program memory and an integrated 10kHz oscillator round off the device. A small amount of external components is sufficient to build a complete weighing electronic.

This product suits for the following applications:

  • Torque wrenches
  • Pressure indicators
  • Legal for trade scales
  • Counting scales

Tools

Title Category Headline Buy
PS081EvalKit Application Board Evaluation Kit for PS081

Technical Documents

Name Type Description Version Language
PS081_BD000321_1-00.png Block Diagram PS081 Block Diagram 1-00 English
PS081_PD000324_1-00.png Other Product Document PS081EvalKit Image 1-00 English
PS081_DS000325_1-00.pdf Datasheet Document version 0.9 1-00 English
PS081_AN000247_1-00.pdf Application Note Solar Body Scale 1-00 English
PS081_AN000248_1-00.pdf Application Note Solar Kitchen Scale 1-00 English

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