CSS Mixed Signal ASIC Solutions

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Sensor ASIC Applications


Sensor Interface & Bar Display Driver

This custom ASIC converts an analog input into one of ten programmable ranges and displays the result on a 10 segment bar display. The input range is nominally 0V to 2.55V and is set by either an internal or external reference voltage. The voltage level for each range has a resolution of 8 bits and is stored in EEPROM. Display options include “Bar” or “Pointer” and can drive either LED or LCD type displays.

Features
  • Internal 5V Regulator
  • Input Range = 0V to 2.55V
  • Internal or External Voltage Reference
  • 10 Programmable Ranges
  • Resolution = 8 Bits
  • Linearity = ±1LSB
  • Internal Clock Oscillator
  • Temperature Range = -40°C to +85°C
 

Magneto-Resistive (MR) Position Sensor

This IC determines the angular position of a magnetically encoded disk. An adaptive, five channel IDAC biases five MR elements. The optimum bias and sense levels are determined by averaging the signals from four quadrature sensors. The circuit compensates for variations due to processing, temperature and supply voltage. This device has two quadrature outputs plus an index pulse to allow position, velocity and direction to be determined.

Features
  • Supply Voltage = 5V
  • 5 Channel IDAC (for bias currents)
  • Channel to channel mismatch < 0.5%
  • Range = 0.2mA to 3mA, 64 steps
  • Adaptive Bias & Sense Levels
  • 1 Index and 2 Quadrature Outputs
  • Temperature Range = -40°C to +125°C
 

Piezoelectric Accelerometer Sensor

This device detects linear and angular acceleration. It interfaces to three piezoelectric sensing elements. Each sensor has a dedicated amplifier and window comparator. Their gain and trip levels can be tailored for each application via onboard EEPROM. A sleep mode is provided to minimize power in battery applications.

Features
  • Measures Linear & Angular Acceleration
  • Wide Supply Range (2.7V to 5.5V)
  • 3 Piezoelectric Sensor Channels
  • Adjustable gain (8 settings per channel)
  • Wide frequency range (15Hz to 2KHz)
  • Fast response time (< 10 usec)
  • Temperature Range = -40°C to +85°C