Digital and Mixed-Signal ICs from ZMD

Advanced Differential Sensor Signal Conditioner ZMD31050

DESCRIPTION

ZMD31050 is a CMOS integrated circuit for highly-accurate amplification and sensor-specific correction of bridge sensor and temperature sensor signals. The device provides digital compensation of sensor offset, sensitivity, temperature drift and nonlinearity by a 16-bit RISC micro controller running a correction algorithm.

ZMD31050 accommodates virtually any bridge sensor type (e.g. piezo-resistive, ceramic-thickfilm or steel membrane based). In addition, the IC can interface to a separate temperature sensor. The bi-directional digital interfaces (I2C, SPI, ZACwire™) can be used for a simple PC-controlled one-shot calibration procedure, in order to program a set of calibration coefficients into an onchip EEPROM. Thus a specific sensor and a ZMD31050 are mated digitally: fast, precise and without the cost overhead associated with trimming by external devices or laser.

ZMD31050 has been designed for industrial, medical and consumer applications and is specifically suited for most pressure sensors. It can also be used with force, torque, acceleration, angle, position and revolution sensors.

FEATURES

• Digital compensation of sensor offset, sensitivity, temperature drift and non-linearity

• Accommodates nearly all bridge sensors types
• Digital one-shot calibration: quick and precise
• Selectable temperature compensation reference: bridge, internal diode, external diode or thermistor
• Output options: voltage (0...5V), current (4...20mA), PWM, I2C, SPI, ZACwire™ (one-wire-interface), alarm
• Adjustable output resolution (up to 15 bits) versus sampling rate (up to 3.9kHz)
• Selectable bridge excitation: ratiometric voltage, constant voltage or constant current
• Input channel for separate temperature sensor
• Sensor connection check and common mode check (sensor aging detection)
• Operation temperature, depending on product version, up to -55...+150°C
• Supply voltage +2.7V...+5.5V
• Available in SSOP16 and as die

BENEFITS

• No external trimming components required
• PC-controlled configuration and calibration via digital bus interface – simple, low cost
  
• High accuracy (±0.1% FSO @ -25 to 85°C; ±0.25% FSO @ -40 to 125°C)

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