Analog Devices Inc./Maxim Integrated DS620U+T&R

Overview

DS620U+T&R from Maxim Integrated is a low-voltage (1.7V–3.5V) digital thermometer and thermostat IC with ±0.5°C accuracy from 0°C to +70°C, -55°C to +125°C operating range, 2-wire serial interface, and standalone thermostat capability via user-programmable TH/TL thresholds stored in EEPROM. It serves as a system-level temperature sensor and thermal control element in portable and embedded thermal management circuits.

For engineers reviewing the DS620U+T&R datasheet, DS620U+T&R pinout, DS620U+T&R application, or DS620U+T&R equivalent, key selection criteria include its 8-pin μSOP package with exposed pad, 10–13-bit user-selectable resolution (0.0625°C to 0.5°C LSB), open-drain programmable output (PO) for direct peripheral control, and multidrop support for up to eight devices on one bus.

Technical Context

The DS620U+T&R integrates a bandgap-based temperature sensor core with a delta-sigma ADC, configurable resolution (10–13 bits), and nonvolatile EEPROM for thermostat thresholds (TH/TL) and configuration bits (R0/R1, AUTOC, 1SHOT, PO1/PO2). Its 2-wire interface complies with standard I²C timing (400kHz max SCL), with open-drain SDA and PO pins requiring external pull-ups.

Standalone operation is enabled by factory-programmable EEPROM registers: AUTOC=1 initiates automatic conversion at power-up; A1 pin acts as one-shot trigger; PO-HIGH/PO-LOW modes provide hysteresis-controlled active-low thermostat outputs updated after each conversion or temperature register write.

Key Specifications

Pinout & Package

Package: 8-pin μSOP with exposed thermal pad (connected to GND or floated; never to VDD). The exposed pad improves thermal coupling to PCB for accurate board-temperature measurement.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital thermometer and thermostat applications.

Compared with MAX31820 and LM75BIMM/NOPB, DS620U+T&R uniquely combines I²C compatibility, user-configurable resolution, nonvolatile thermostat thresholds, and a dedicated open-drain PO pin - enabling both precision sensing and autonomous thermal control in a single 8-pin package.

Availability

DS620U+T&R is available at Aetrix Electronics and suitable for portable medical sensors, industrial motor controllers, and server blade thermal management requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for DS620U+T&R includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and digital ICs for demanding industrial, medical, and communications applications.

The DS620U+T&R belongs to Maxim's digital temperature sensor and thermostat product line, engineered for low-power, high-accuracy thermal monitoring and autonomous thermal protection in space-constrained, battery-operated, and harsh-environment systems.

FAQ

What is the maximum operating temperature range supported by the DS620U+T&R?

The DS620U+T&R operates across -55°C to +125°C, with ±0.5°C accuracy specified from 0°C to +70°C and ±2°C accuracy over the full range. This makes DS620U+T&R suitable for under-hood automotive modules, industrial motor drives, and high-density server boards where ambient temperatures exceed 100°C.

Can the DS620U+T&R function without a microcontroller?

Yes - DS620U+T&R supports true standalone thermostat operation. When AUTOC=1 and TH/TL thresholds are preprogrammed into EEPROM, DS620U+T&R automatically begins temperature conversions at power-up and asserts its PO pin based on threshold comparisons - no host MCU or software required.

How does the programmable output (PO) pin behave in different configurations?

The DS620U+T&R PO pin is configurable as PO-HIGH (active-low when T ≥ TH), PO-LOW (active-low when T ≤ TL), or forced-low control output. All modes use open-drain architecture with 4mA sink capability and 0.4V saturation voltage at 4mA - enabling direct drive of MOSFET gates or logic inputs without external buffers.

What is the role of the exposed thermal pad on the DS620U+T&R package?

The exposed pad on the DS620U+T&R's 8-pin μSOP package provides a low-thermal-resistance path from the die to the PCB ground plane. When connected to a solid ground copper area, it improves thermal coupling accuracy by >1.5°C and enhances heat dissipation - critical for reliable board-temperature measurement in compact layouts.

Does the DS620U+T&R support multidrop configurations on a single 2-wire bus?

Yes - DS620U+T&R implements a 3-bit hardware address (A2/A1/A0), allowing up to eight devices to share one 2-wire bus. Each device responds only to its unique 7-bit slave address (1001A2A1A0), enabling distributed thermal sensing across multiple PCB zones without address conflicts or bus arbitration.