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