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PICOSTRAIN

Time to Digital Converters for Digital Strain Gage
PICOSTRAIN PS08
PICOSTRAIN PS081
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Strain Gage Applications
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Time to Digital Converters for Capacitance Measurement
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PS081 - System-On-Chip, Strain Gage for Weigh Scales

PS081 Full Featured - System-On-Chip Strain Gage
Acam has enhanced the PS08 original to bring and even more advanced digital strain gage circuit. Building on the PS08, the PS081 features the same great capabilities and new enhancements based on the PICOSTRAIN® measuring principle.

PS081 Enhancements

  • Integrated high resolution time-to-digital-converter with 24-Bit microprocessor

  • Includes LCD controller and an EEPROM with read access protection

  • Consumes ultra low current for long battery life and solar storage

  • Extended memory range with enlarged ROM routines

  • Enhanced IO-capabilities and Optional interface for external LCD driver control

Better Than Traditional Analog-to-Digital Converters

The PS081 low power microprocessor has impressive performance and efficient power management. With the PICOSTRAIN® measuring principle more than 28-Bit rms resolution is attained with linearity and drift numbers comparable to absolute high-end Sigma-Delta A/D-converters.
PICOSTRAIN® Circuits

PS081 SOC Strain Gage

Modern Weight Measurement

The PS081 fulfills all requirements of a strain gage system-on-chip solution for modern weight measurement. The PS081 is designed for modern digital weigh scales, wireless scales, force and pressure sensors and torque evaluation products and is scalable for consumer, industrial and manufacturing applications.

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PS081 - System-On-Chip - Features
  • PICOSTRAIN® strain gage front-end to 19,5 bit resolution (@2mV/V)
  • Measurement for half-bridge, full-bridge, quattro-bridge and Wheatstone-bridges
  • 24-Bit Microprocessor and progam memory including charge - 2 k x 8-Bit EEprom
  • Enhanced program code: 48 Bit multiplication, division, binary to 7-segment conversion - 3 k ROM
  • 8-layer hardware stack and up to 18 programmable I/O-ports
  • Very low current 10 kHz oscillator (300 nA)
  • Driver for external 4 MHz ceramic oscillator
  • Operating current 0.7 µA with timer active and watchdog timer
  • 4 x 14, 3 x 15, 2 x 16 LCD driver, optional SPI to external LCD driver support
  • Embedded charge pump for LCD at 2-3 V
  • Embedded bandgap voltage reference for low battery detection and LCD voltage stabilization
  • Ports for temperature measurement with low-cost external carbon resistors
  • Serial SPI interface for EEPROM programming or operation with an external microprocessor
  • Supply voltage 2.2 to 3.6 V at full functionality, down to 1.5 V
  • System operational current down to 17 µA at 3 Hz and 2000 divisions
  • As dice (115 µm pitch) or packaged (QFN56)
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PS081 - Circuit Block Diagram and Package Outline

Block Diagram

Package Outline

PS081 block diagram QFN56 Ps081 Package Outline
Click the images for a closup view
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Applications
Weigh Scales Build Digital Load Cells Pressure Sensors
Solar Body Scale Single-Chip Weight Scales Torque Measurement Systems
Legal for Trade Scale Battery Operated Scale Solar Kitchen Scale
Portable and Wireless Scales Calibrated Scales Postal Scales