Analog Devices Inc./Maxim Integrated DS1832S+

Overview

DS1832S+ from Maxim Integrated is a programmable digital thermostat and thermometer IC with 1-Wire® interface, operating from –55°C to +125°C, delivering ±1°C accuracy over 0°C to +85°C, and providing 8-bit (1°C resolution) temperature readings in ≤1 second. It functions as a standalone thermostat with user-defined TH/TL trip-points stored in nonvolatile EEPROM, used in industrial thermal monitoring and embedded thermostatic control.

For engineers reviewing the DS1832S+ datasheet, DS1832S+ pinout, DS1832S+ application, or DS1832S+ equivalent, key selection criteria include its single-pin 1-Wire communication, dual-mode operation (thermostat vs. sensor), EEPROM-programmable trip points, open-drain DQ output polarity control, and SO-8 package compatibility with legacy DS1821S designs.

Technical Context

The DS1832S+ implements a proprietary direct-to-digital temperature sensor using dual-oscillator architecture (low-temp-co counter + high-temp-co gate timer) to generate 8-bit centigrade values in two's complement format. Its 1-Wire interface operates on a single open-drain DQ line with 4.7 kΩ pull-up, requiring no external components beyond VDD decoupling.

It supports two mutually exclusive operating modes selected by the nonvolatile T/R¯ bit: 1-Wire mode for register read/write (TH, TL, status/configuration) and temperature polling; or thermostat mode for autonomous hysteresis-based switching with active-high/low DQ output determined by the POL bit. Nonvolatile registers retain settings across power cycles.

Key Specifications

Pinout & Package

DS1832S+ is housed in an 8-pin SOIC (208-mil) package with GND, DQ, VDD, and five NC terminals. The DQ pin serves dual roles: bidirectional 1-Wire data I/O and open-drain thermostat output. VDD requires local 0.1 µF decoupling; no external oscillator or reference components are needed.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1821S+, DS1832S+ offers identical functionality with updated RoHS compliance and lifecycle support, while MAX31820 provides enhanced resolution and accuracy at the cost of firmware adaptation - making DS1832S+ optimal for cost-sensitive, safety-critical thermostatic applications where 1°C granularity suffices.

Availability

DS1832S+ is available at Aetrix Electronics and suitable for industrial temperature monitoring, embedded thermostatic control, consumer appliance safety, medical thermal protection, and HVAC system design requiring stable component supply and long-term manufacturability.

Supply support for DS1832S+ 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) is a semiconductor company specializing in precision analog, mixed-signal, and high-reliability interface solutions for industrial, automotive, and medical markets.

The DS1832S+ belongs to Maxim's 1-Wire temperature sensor family, designed specifically for applications demanding autonomous thermal decision-making with minimal external components and robust operation across extreme temperatures.

FAQ

What is the operating voltage range for DS1832S+?

The DS1832S+ operates from 2.7 V to 5.5 V DC. This wide supply range allows direct interfacing with both 3.3 V and 5 V microcontroller systems without level-shifting circuitry. The device maintains full specification compliance-including ±1°C accuracy and 1-second conversion time-across this entire voltage window, as verified in the DC Electrical Characteristics table of the official datasheet.

Does DS1832S+ require external components to function?

No, DS1832S+ requires no external components for basic operation. Only a 4.7 kΩ pull-up resistor on the DQ line and a 0.1 µF ceramic capacitor between VDD and GND are recommended for reliable 1-Wire communication and power stability. No crystal, RC network, ADC, or op-amp is needed-the DS1832S+ integrates all sensing, conversion, memory, and output logic internally.

How does DS1832S+ switch between thermostat and sensor modes?

DS1832S+ switches modes via the nonvolatile T/R¯ bit in its status/configuration register: T/R¯ = 0 configures 1-Wire sensor mode; T/R¯ = 1 configures standalone thermostat mode. This bit is stored in EEPROM and persists across power cycles. Mode change is performed using the Write Status [0Ch] command in 1-Wire mode-no hardware modification is required.

What is the meaning of the THF and TLF flags in DS1832S+?

The THF (Temperature High Flag) and TLF (Temperature Low Flag) are nonvolatile status bits that latch once the measured temperature exceeds TH or falls below TL, respectively. They remain set until explicitly cleared by the host via Write Status command. These flags provide thermal event history across power cycles-critical for diagnostics in unattended industrial or medical systems using DS1832S+.

Can DS1832S+ operate without a VDD connection?

No, DS1832S+ requires a valid VDD supply (2.7–5.5 V) for all operations. Unlike some later 1-Wire sensors (e.g., DS18B20), it does not support parasitic power mode. The VDD pin must be connected; relying solely on DQ for power will prevent temperature conversion, EEPROM writes, and thermostat output assertion in DS1832S+.