Digital and Mixed-Signal ICs from ZMD

Fast & Accurate Sensor Signal Conditioner ZMD31150

DESCRIPTION

ZMD31150 is a highly accurate, fast CMOS integrated circuit for amplification and correction of resistive bridge type sensors. It digitally compensates offset, sensitivity, temperature drift and non-linearity through a 16-bit RISC micro-controller running a correction algorithm.

ZMD31150 accommodates virtually all resistive bridge sensor types, e.g. piezo-resistive, metal thin film, ceramic-thick film, etc. Measured values are output as either analog voltage or via one of the digital interfaces, ZACwire™ or I²C.

Calibration on the ZMD31150 is controlled by a simple PC-controlled procedure that programs a set of calibration coefficients into the chip EEPROM. Your specific sensor and ZMD31150 are mated digitally. It’s simple, fast, precise - all without the costly overhead associated with trimming components.

The ZMD31150 is ideally suited for automotive applications due to it’s protection circuitry and excellent electromagnetic compatibility.

FEATURES

• Digital compensation of sensor offset, sensitivity, temperature drift and non-linearity
• Adjustable to nearly all bridge sensors types
• Output options:  analog voltage (0 to 5V), ZACwire™ (digital one-wire interface) or I²C
• Selectable temperature compensation reference: bridge, internal diode, external diode or thermistor
• Sensor biasing by voltage or constant current
• Sampling rate up to 7.8kHz
• HIgh voltage protection (+33V without time limit)
• Reverse polarity and short circuit protection
• Wide operating temperature range: -40°C to +150°C
• Supply voltage:  4.5 to 5.5 VDC
• Product traceability by user-defined EEPROM entries
• Safety and diagnostic functions
• Availabe in SSOP14 package or as die

BENEFITS

• High accuracy ±0.1% FSO @ -25 to 85°C; ±0.25% FSO @ -40 to 125°C, ±0.50% FSO @ -40 to 150°C
• Single pass PC-controlled calibration via I²C or ZACwire™ interface: simple, cost-efficient, quick and precise
• "end-of-line" calibration via one-wire interface permits calibration after assembly
• No costly external trimming components required

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