Datasheet ZSSC3240 Sensor Signal Conditioner IC for Resistive Sensors Description Features The ZSSC3240 is a sensor signal conditioning IC Digital communication and calibration interfaces (SSC) for highly accurate amplification, digitization, o SPI up to 10MHz and sensor-specific correction of resistive sensor o I2C (Standard, Fast, and High-Speed Mode) signals. The ZSSC3240 is suitable for bridge and o One-wire-interface (OWI), up to 100kBit/s half-bridge sensors, as well as external voltage- source element and single-element sensors (e.g., Accommodates nearly all resistive bridge sensor Pt100 and external temperature sensor diodes) types (signal spans from 1mV/V up to 500mV/V) powered by an on-chip current source. Digital Supports different sensor element configurations: compensation of the sensor offset, sensitivity, o Resistive bridge or half-bridge temperature drift, and non-linearity is accomplished o Resistive divider string via a 26-bit math core running a correction algorithm with calibration coefficients stored in a non-volatile, o Voltage source reprogrammable memory. The programmable, On-chip temperature sensor integrated sensor front-end allows optimally applying External temperature sensing supported, e.g. various sensors for a broad range of applications. sensor-bridge as temperature detector, external The ZSSC3240 provides measurement value diode, etc. readouts and programming capabilities via an I2C, Support for Pt100 SPI, or one-wire interface (OWI). Three different Programmable 16-bit digital-to-analog-converter and operation modes allow optimal development of output: digital, digital-analog, and analog-output smart o (0V to 1V) or (0V to 5V) absolute voltage output sensor modules including wake-up on request, continuous-on/fast-response, and automatic/cyclic o VDD-ratiometric voltage output sensor measurement operations. Absolute and o 4mA to 20mA current-loop output supported ratiometric voltage, current-loop, or interrupt analog o 0V to 10V absolute-voltage output supported outputs are supported by the ZSSC3240. The analog output options and digital interface options On-chip voltage regulators for sensor supply, and IC (for calibration and/or a digital application interface) operation can be combined. Support for extra regulation by external transistor, for example JFET Programmable 24-bit sensor-signal-conditioning Basic Application Diagram math core Sensor Reprogrammable, nonvolatile memory (NVM) VDD Element Programmable measurement scheduler for VSS continuous sensing applications, with optimized balance of ZSSC3240 OUT ANA o Energy consumption o Output update rate o Sensor-signal-conditioning accuracy o Self-diagnostic coverage and system safety Optional Digital Master (I2C, SPI, OWI) On-chip diagnostics: o Sensor connection o Broken-chip-check / chipping-check o Memory integrity Apr.28.21 Page 1 Rt1 ZSSC3240 Datasheet Physical Characteristics Typical Applications Supply voltage, V : 2.7V to 5.5V Calibrated, continuously operating sensors with DD with external transistor, for example digital interface and/or analog output: (absolute or JFET: 5V to 48V ratiometric) voltage or current loop output Operating temperature: -40C to 125C Enables smart, digital sensors for energy-efficient solutions Supported sensor elements: 0.5k to 60k Pressure, flow, and level sensing 2 Available as die on wafers or 4 4 mm 24-QFN with wettable flanks, allowing visual inspection of Industrial applications e.g. process/factory QFN reflow quality automation Consumer / white goods, e.g. HVAC, weight scales Medical applications, e.g. blood pressure, continuous smart health monitors Block Diagram Sensor Supply: voltage / ratiometric LDOctrl TEXT external VDDA int Internal Transistor VDD Internal Voltage V TP Regulation Sensor AGND / CM IC Bias Current Temp. Regulators Sensor VSS Bias Generator Generator V VDDB TN Sensor Element Current Power Ctr. Ana Dig Sensor Supply: ZSSC3240 current mode AOUT / DAC 13-16Bit OWI1 RESQ A INP D FB PGA 12-24Bit VSSB OWI OWI2 in INN Digitial Control and EOC Math Core Analog SCLK/SCL Clock Sensor System SPI Chipping Power-ON SS Generator Connection Control NVM Check Reset MOSI/SDA Oscillator Unit Diagnostics I2C MISO Typical Application Examples Digital Half-Bridge Sensor, e.g. PT100 Analog Sensor with Absolute Voltage Out VDD (2.7-5.5V) VDD VDDB VSS (2.7 to 5.5V) VDDB INP VSS PTC / NTC VSSB INP AOUT / OWI1 ZSSC3240 OWI 4 INN VSSB AOUT / OWI1 V OUT, absolute ZSSC3240 4 INN (0 to 1V / 0 to 5V) Sensor Half- SS Bridge Sensor Bridge Digital Interface: I2C or SPI or OWI Sensor with Ratiometric Voltage Output and Digital Interface Analog Sensor with Current Loop Output, OWI, and External JFET VDD Loop+ (2.7 to 5.5V) 5 to (7 to 48V) 5.5V OWI VDDB VSS INP VOUT, ratiometric (2.5% to 97.5% of VDD) AOUT / VSSB VDDB OWI1 VSS ZSSC3240 4 INN INP FB Sensor Bridge VSSB AOUT / OWI1 V ZSSC3240 SS DD (2.7 to 4 INN OWI2in 5.5V) Digital Interface: Sensor Bridge I2C or SPI or OWI Loop- 4 to 20mA R sens Apr.28.21 Page 2 RESQ RESQ MOSI / SDA MOSI / SDA SCLK / SCL SCLK / SCL MIS VDD MIS VDD O O OWI MUX SENS-SUP OWI Input Multiplexer LDOctrl VDD V DD CAOUT,EMC MUX OUT