MAX6691MUB+T

Sensor And Detector Interfaces Overview

The MAX6691MUB+T is a four-channel thermistor-to-pulse-width converter manufactured by Analog Devices Inc. under the Maxim Integrated brand. It measures temperatures from up to four thermistors and converts them into pulse width modulated (PWM) output signals. The device operates on a single-wire interface requiring only one I/O pin for communication with microcontrollers. It supports both NTC and PTC thermistors, utilizing an internal voltage reference and external resistor network for measurement. The component functions within a temperature range of -55°C to +125°C and is housed in a 10-pin μMAX package.

Sensor And Detector Interfaces Feature Summary

• Four-channel capability allows simultaneous temperature monitoring of multiple thermistors via a single serial interface.
• Single-wire communication protocol simplifies integration with microcontrollers using minimal I/O resources.
• On-chip power management reduces average current consumption through low-power sleep modes between conversions.

Sensor And Detector Interfaces Applications

• Home appliances
• HVAC systems
• Medical equipment

Sensor And Detector Interfaces Procurement Notes

Verify the specific suffix 'MUB' against official Analog Devices documentation to confirm package type and tape/reel specifications. Ensure compatibility with existing PCB footprints for the 10-lead μMAX package. Confirm RoHS compliance status as indicated in the latest datasheet revision. Check for any obsolescence notices or lifecycle changes directly from the manufacturer before finalizing procurement plans.

Sensor And Detector Interfaces Selection Notes

Select this component when multi-point temperature sensing is required with limited microcontroller pins. It is suitable for applications needing direct thermistor interfacing without additional ADC channels. Consider the thermal self-heating effects and ensure appropriate REXT values are chosen to minimize nonlinearity errors across the desired temperature range.

Sensor And Detector Interfaces Part Context

This part belongs to the MAX6691 series of thermistor-to-digital converters. It provides a specialized solution for converting analog thermistor resistance changes into digital pulse widths. The series is designed for cost-effective and space-constrained environments where standard SPI or I2C interfaces might be unavailable or undesirable due to pin count limitations.

Sensor And Detector Interfaces FAQ

How does the MAX6691 communicate temperature data?

It uses a single-wire interface where the microcontroller initiates conversion by pulling the I/O pin low. The device then outputs PWM pulses representing the temperature, with the duty cycle determined by the thermistor resistance ratio.

What types of thermistors are supported?

The MAX6691 supports both Negative Temperature Coefficient (NTC) and Positive Temperature Coefficient (PTC) thermistors, though NTC types are more commonly used in these applications.

How is thermal self-heating error minimized?

The device incorporates on-chip power management that reduces the average current flowing through the thermistors. It enters a low-current sleep mode between conversions to limit self-heating effects.