Analog Devices Inc./Maxim Integrated DS1832S+T&R

Overview

DS1832S+T&R from Maxim Integrated is a programmable digital thermostat and thermometer IC with 1-Wire® interface, operating across –55°C to +125°C, delivering ±1°C accuracy from 0°C to +85°C, and providing 8-bit (1°C resolution) temperature readings in ≤1 second. It functions as a standalone thermostat with nonvolatile TH/TL trip-point registers and supports both 1-Wire communication and autonomous thermostat operation.

For engineers reviewing the DS1832S+T&R datasheet, DS1832S+T&R pinout, DS1832S+T&R application, or DS1832S+T&R equivalent, key selection criteria include its single-pin 1-Wire bus requirement, user-programmable hysteresis via EEPROM-stored trip points, open-drain DQ output polarity control, continuous or one-shot conversion modes, and SO-8 tape-and-reel packaging for automated assembly.

Technical Context

The DS1832S+T&R implements a proprietary direct-to-digital temperature sensor using dual-oscillator architecture with low- and high-temperature-coefficient oscillators to achieve centigrade measurement over –55°C to +125°C. Its 1-Wire interface uses a single open-drain DQ line with 4.7 kΩ pull-up, requiring strict timing for reset, presence, read, and write slots.

Two nonvolatile operating modes are supported: 1-Wire mode (T/R̄ = 0) for register read/write access to TH, TL, and configuration bits (POL, 1SHOT, T/R̄), and thermostat mode (T/R̄ = 1) for autonomous DQ output activation based on programmed trip points. THF/TLF flags retain thermal event history across power cycles.

Key Specifications

Pinout & Package

DS1832S+T&R is housed in an 8-pin SO (208-mil) surface-mount package with lead(Pb)-free/RoHS-compliant finish and tape-and-reel delivery (2000 pcs/reel).

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1832S+T&R, DS18B20+T&R offers superior resolution but lacks autonomous thermostat capability, while LMT70YFFT provides miniaturization at the cost of requiring full signal chain implementation - making DS1832S+T&R uniquely suited for self-contained, low-component-count thermal control.

Availability

DS1832S+T&R is available at Aetrix Electronics and suitable for industrial temperature monitoring, consumer appliance control, medical thermometer systems, and automotive cabin climate sensors requiring stable component supply and long-term lifecycle support.

Supply support for DS1832S+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 industrial, medical, communications, and automotive markets.

The DS1832S+T&R belongs to Maxim's 1-Wire temperature sensor family, engineered specifically for applications demanding minimal interconnect, autonomous thermal decision-making, and robust operation across extreme temperatures without external components.

FAQ

What is the primary function of the DS1832S+T&R?

The DS1832S+T&R is a programmable digital thermostat and thermometer IC that operates either as a standalone thermostat with user-defined trip points or as an 8-bit temperature sensor via 1-Wire interface. Its core function is autonomous thermal monitoring and control, enabled by nonvolatile TH/TL registers and open-drain DQ output. The DS1832S+T&R delivers ±1°C accuracy from 0°C to +85°C and supports both continuous and one-shot conversion modes.

Does the DS1832S+T&R require external components to operate?

No, the DS1832S+T&R requires no external components for basic thermostat or temperature-sensing operation. Only an external 4.7 kΩ pull-up resistor on the DQ line is needed for 1-Wire communication or thermostat output signaling. No external crystal, capacitor, or voltage reference is required - all timing and sensing circuitry is integrated. This makes the DS1832S+T&R ideal for space-constrained and low-BOM designs.

How does the DS1832S+T&R enter standalone thermostat mode?

The DS1832S+T&R enters standalone thermostat mode when the T/R̄ bit in its status/configuration register is set to 1 and stored in nonvolatile EEPROM. Upon power-up, the device automatically begins continuous temperature conversions and configures the DQ pin as an open-drain thermostat output. The DS1832S+T&R remains in this mode until the T/R̄ bit is rewritten, allowing fully autonomous operation without host MCU involvement after initial programming.

What is the meaning of the THF and TLF bits in the DS1832S+T&R status register?

The THF (Temperature High Flag) and TLF (Temperature Low Flag) bits in the DS1832S+T&R status register are nonvolatile flags indicating whether the measured temperature has ever exceeded the TH register value (THF = 1) or fallen below the TL register value (TLF = 1). These flags persist across power cycles and must be manually cleared by the user. They provide diagnostic insight into thermal excursion history, enhancing reliability analysis in safety-critical DS1832S+T&R deployments.

Can the DS1832S+T&R be used in multi-drop 1-Wire configurations?

No, the DS1832S+T&R cannot be used in multi-drop 1-Wire configurations. Unlike addressable 1-Wire devices such as the DS18B20, the DS1832S+T&R lacks a unique ROM ID and is not designed for bus sharing. It functions as a single-slave device per 1-Wire bus. Attempting to connect multiple DS1832S+T&R units to one bus will cause communication conflicts and undefined behavior. Each DS1832S+T&R requires its own dedicated 1-Wire line.