Sensors and Sensor Interface
MAX6603

MAX6603

Dual-Channel, Platinum, RTD-to-Voltage Signal Conditioner

Replaces Expensive, Discrete Solutions while Reducing Board Space by Offering Complete Automotive Fault Protection Against ESD (±8kV Rated) and Short-to-Battery Fault, Plus Sensitive Microcontroller Inputs Protection


Description

The MAX6603 dual-channel, platinum RTD-to-voltage signal conditioner excites and amplifies the signal from two external 200Ω platinum-resistive temperature devices (Pt RTD) to achieve high-voltage, level-filtered signals for temperature measurements. The MAX6603 provides a direct ratiometric output voltage to simplify the interface to microcontrollers with integrated analog-to-digital converters (ADCs). External precision resistors and calibration processes are not needed. The MAX6603 provides the necessary signal-conditioning functions, including ratiometric excitation current, amplification, buffered voltage outputs, diagnostic fault detections, and input protection. The MAX6603 amplifies signals from two RTDs operating over the -40°C to +1000°C temperature range and provides the temperature information as two independent analog voltages. The MAX6603 features a ±6°C (max) accuracy over the +400°C to +600°C temperature range.

The MAX6603 has overvoltage protection up to +16V on RTD inputs, and ±5kV electrostatic discharge (ESD) protection at RTD input pins for reliable operation where RTD temperature-sensing probes are used. The MAX6603 monitors the RTD for faults and asserts the respective active-low DG output low for fault conditions. The analog voltage outputs can be readily connected to a variety of microcontrollers.

The MAX6603 is available in a small, 10-pin TDFN-EP package and operates over the -40°C to +125°C automotive temperature range from a single +3V to +5.5V power supply.
MAX6603: Typical Operating Circuit MAX6603: Typical Operating Circuit Enlarge++

Key Features

  • Amplifies Pt RTD Temperature Signals
  • ±5kV ESD Protection on RTD Inputs
  • +16V Overvoltage Fault Protection on RTD Inputs
  • Low RTD Excitation Current Minimizes Self-Heating Errors
  • Small, 10-Pin TDFN Package
  • Fully Ratiometric Operation
  • No Calibration Required for Standard RTDs
  • RTD Diagnostic Check
  • High Accuracy: ±6°C (max) from +400°C to +600°C

Applications/Uses

  • Braking Systems
  • Engine Control Management to Meet EURO IV Regulations
  • Food Transportation Monitoring Systems
  • Industrial Process Measurements
  • Industrial Temperature Sensors

Technical Documents

Tutorial 4679 Thermal Management Handbook
Reference Schematic 4531 Reference Design for a PC-based Temperature-Measurement System

Quality and Environmental Data

Request Reliability Report for: MAX6603 
Lead-Free Package Tin (Sn) Whisker Reports
 

Related Resources


MAX31629
I 2C Digital Thermometer and Real-Time Clock

  • Measures Temperatures from -55°C to +125°C; Fahrenheit equivalent is -67°F to +257°F
  • Real-Time Clock Counts Seconds, Minutes, Hours, Day, Day of the Week, Month, Day of the Month, and Year, with Leap-Year Compensation through the Year 2100
  • Thermometer Accuracy of ±2.0°C

MAX31730
3-Channel Remote Temperature Sensor

  • One Local and Three Remote Temperature-Sensing Channels
  • 3.0V to 3.6V Operation
  • 12-Bit, 0.0625°C Resolution

MAX14832
One-Time Programmable Industrial Sensor Output Driver

  • High Configurability
  • Robust Design
  • Glitch Filtering on Logic Input

MAX31760
Precision Fan-Speed Controller with Nonvolatile Lookup Table

  • Customizable 48-Byte Lookup Table (LUT)-Based Architecture Enables a Smooth Nonlinear Control Output that Reduces Acoustic Noise
  • Operating Settings Stored in Nonvolatile Memory for Automatic Operation at Power-On
  • Two Tachometer Inputs Provide Flexibility by Measuring the Speeds of Two Fans Independently

MAX31912
Industrial, Octal, Digital Input Translator/Serializer

  • Eight High-Voltage Input Channels (36V max)
  • Configurable for IEC 61131-2 Input Types 1, 2, 3
  • Wide Operating Supply Range of 7V to 36V

MAX21001
Ultra-Accurate, Automotive, 3-Axis Digital Output Gyroscope

  • Minimum Overall Footprint
  • High Accuracy and Stability
  • High Flexibility