Description
The ZSSC3240 is a sensor signal conditioning IC (SSC) for highly accurate amplification, digitization, and sensor-specific correction of resistive sensor signals. The ZSSC3240 is suitable for bridge and half-bridge sensors, as well as external voltagesource element and single-element sensors (e.g., Pt100 and external temperature sensor diodes) powered by an on-chip current source. Digital compensation of the sensor offset, sensitivity, temperature drift, and non-linearity is accomplished via a 26-bit math core running a correction algorithm with calibration coefficients stored in a non-volatile, reprogrammable memory. The programmable, integrated sensor front-end allows optimally applying various sensors for a broad range of applications.

FEATUREs
• Digital communication and calibration interfaces
   o SPI up to 10MHz
   o I2C (Standard, Fast, and High-Speed Mode)
   o One-wire-interface (OWI), up to 100kBit/s
• Accommodates nearly all resistive bridge sensor
   types (signal spans from 1mV/V up to 500mV/V)
• Supports different sensor element configurations:
   o Resistive bridge or half-bridge
   o Resistive divider string
   o Voltage source
• On-chip temperature sensor
• External temperature sensing supported, e.g.
   sensor-bridge as temperature detector, external
   diode, etc.
• Support for Pt100
• Programmable 16-bit digital-to-analog-converter and
   output:
   o (0V to 1V) or (0V to 5V) absolute voltage output
   o VDD-ratiometric voltage output
   o 4mA to 20mA current-loop output supported
   o 0V to 10V absolute-voltage output supported
• On-chip voltage regulators for sensor supply, and IC
   operation
• Support for extra regulation by external transistor, for
   example JFET
• Programmable 24-bit sensor-signal-conditioning
   math core
• Reprogrammable, nonvolatile memory (NVM)
• Programmable measurement scheduler for
   continuous sensing applications, with optimized
   balance of
   o Energy consumption
   o Output update rate
   o Sensor-signal-conditioning accuracy
   o Self-diagnostic coverage and system safety
• On-chip diagnostics:
   o Sensor connection
   o Broken-chip-check / chipping-check
   o Memory integrity

Typical Applications
• Calibrated, continuously operating sensors with
   digital interface and/or analog output: (absolute or
   ratiometric) voltage or current loop output
• Enables smart, digital sensors for energy-efficient
   solutions
• Pressure, flow, and level sensing
• Industrial applications; e.g. process/factory
   automation
• Consumer / white goods, e.g. HVAC, weight scales
• Medical applications, e.g. blood pressure,
   continuous smart health monitors