Datasheet ZSSC3240 Sensor Signal Conditioner IC for Resistive Sensors DescriptionFeatures 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 signals. The ZSSC3240 is suitable for bridge and o I2C (Standard, Fast, and High-Speed Mode) half-bridge sensors, as well as external voltage- o One-wire-interface (OWI), up to 100kBit/s 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, temperature drift, and non-linearity is accomplished o Resistive bridge or half-bridge via a 26-bit math core running a correction algorithm o Resistive divider string 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 various sensors for a broad range of applications. • External temperature sensing supported, e.g. 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 operation modes allow optimal development of • Programmable 16-bit digital-to-analog-converter and output: digital, digital-analog, and analog-output smart sensor modules including wake-up on request, o (0V to 1V) or (0V to 5V) absolute voltage output 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 outputs are supported by the ZSSC3240. The o 0V to 10V absolute-voltage output supported 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 OUTANA o Energy consumption o Output update rate o Sensor-signal-conditioning accuracy Optional Digital Master o Self-diagnostic coverage and system safety (I2C, SPI, OWI) • On-chip diagnostics: o Sensor connection o Broken-chip-check / chipping-check o Memory integrity Apr.15.20 Page 1 Document Outline 1. Pin Assignments 2. Pin Descriptions 3. Absolute Maximum Ratings 4. Recommended Operating Conditions 5. Electrical Characteristics 6. Device Description 6.1 Signal Flow 6.2 Analog (Sensor) Front-End 6.2.1. Programmable-Gain Amplifier (PGA) 6.2.2. Analog-to-Digital Converter (ADC) 6.2.3. Internal Temperature Sensor 6.2.4. Supported Supplies for Sensor Elements and Additional, External Temperature Sensing 6.3 On-Chip Diagnostics 6.4 Digital Interfaces 6.4.1. SPI 6.4.2. I2C 6.4.3. One-Wire-Interface, OWI 6.5 Measurement and Output Options 6.5.1. Single Measurements, Digital Raw Results, and SSC Results 6.5.2. Cyclic, Continuous, Repeated Measurements – Measurement Scheduler 6.5.3. Analog Outputs: Digital-to-Analog Converter (DAC) 6.5.4. Output Interrupt Signaling 6.6 System Setup and Control 6.6.1. Digital Commands 6.6.2. Nonvolatile Memory (NVM) 6.6.3. Digital Sensor-Signal-Conditioning Mathematics 6.7 External, Extra LDO (LDOctrl) for Applications for > 5.5V 7. Calibration 8. Package Outline Drawings 9. Marking Diagram 10. Ordering Information 11. Glossary 12. Revision History
