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PICOSTRAIN PS081 Features

General Circuit Features

  • PICOSTRAIN Front-End with up to 19.5 Bit resolution (@2mV/V)
  • Capability to measure half-bridges, full-bridges, quattro-bridges and Wheatstone-bridges
  • Microprocessor with 24-Bit data structure
  • 2 k x 8-Bit EEprom progam memory including charge pump (no need of an additional programming voltage)
  • 3 k ROM powerful program code like 48 Bit multiplication and division or binary to 7-segment conversion
  • 8-layer hardware stack
  • Embedded very low current 10 kHz oscillator (300 nA)
  • Driver for external 4 MHz ceramic oscillator
  • Operating current 0.7 µA with timer active
  • up to 18 programmable I/O-ports
  • 4 x 14, 3 x 15, 2 x 16 LCD driver, optional SPI to external LCD driver support
  • Embedded charge pump for driving the LCD at 2.0 V, 2.5 V and 3.0 V
  • Embedded bandgap voltage reference for low battery detection and LCD voltage stabilization
  • Ports for temperature measurement with low-cost external carbon resistors
  • Watchdog timer
  • 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 without EEPROM reprogramming and voltage measurement
  • System operational current down to 17 µA at 3 Hz and 2000 divisions
  • As dice (115 µm pitch) or packaged (QFN56)

Connecting a quattro-bridge

(Click to enlarge)

Minimal PS081 circuit with full-bridge