Analog Devices Inc./Maxim Integrated DS1832+

Overview

DS1832+ 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 autonomously as a standalone thermostat using user-defined TH/TL trip-points stored in nonvolatile EEPROM, commonly deployed in industrial thermal monitoring and embedded environmental control systems.

For engineers reviewing the DS1832+ datasheet, DS1832+ pinout, DS1832+ application, or DS1832+ equivalent, key selection considerations include its dual-mode operation (1-Wire sensor vs. self-contained thermostat), open-drain DQ pin behavior, nonvolatile trip-point storage, VDD-dependent conversion timing, and TO92/SO package compatibility with legacy DS1821 designs.

Technical Context

The DS1832+ implements a proprietary direct-to-digital temperature sensing architecture using dual oscillators-one with low temperature coefficient for counting and one with high temp-co for gate timing-enabling centigrade measurement without external calibration. Its internal logic supports two mutually exclusive operating modes: 1-Wire mode (T/R̄ = 0) for microprocessor-controlled read/write access to TH, TL, status, and temperature registers; and thermostat mode (T/R̄ = 1) for autonomous DQ output activation based on preprogrammed thresholds.

Communication occurs exclusively via the open-drain DQ pin using Maxim's 1-Wire protocol, requiring no external components beyond a 4.7 kΩ pullup resistor. All configuration bits affecting power-up behavior (T/R̄), thermostat polarity (POL), and conversion mode (1SHOT) are stored in nonvolatile EEPROM, retaining settings across power cycles. The NVB bit enables real-time monitoring of EEPROM write completion.

Key Specifications

Pinout & Package

DS1832+ is available in 3-pin TO92 (DS1832+T) and 8-pin SO (DS1832+S) packages. Both variants share identical pin functionality and electrical characteristics; unused pins in SO package are NC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS18B20+ and LMT70AYPWR, the DS1832+ uniquely combines autonomous thermostat operation, EEPROM-stored trip points, and minimal 3-pin TO92 packaging - making it the most direct solution for cost-optimized, single-point thermal control without host processor dependency.

Availability

DS1832+ is available at Aetrix Electronics and suitable for industrial temperature monitoring, embedded appliance control, automotive cabin climate systems, and medical diagnostic equipment requiring stable component supply and long-term lifecycle support.

Supply support for DS1832+ 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 ICs for industrial, automotive, and communications markets.

The DS1832+ belongs to Maxim's 1-Wire temperature sensor family, designed specifically for applications demanding integrated thermal sensing, autonomous decision-making, and minimal external component count in constrained environments.

FAQ

What is the operating temperature range of the DS1832+?

The DS1832+ operates across –55°C to +125°C, fully specified and tested over this range. Its ±1°C accuracy is guaranteed only from 0°C to +85°C per the datasheet's DC Electrical Characteristics table; outside that span, error increases gradually as shown in the Typical Error vs. Temperature curve. This makes DS1832+ suitable for extreme environments like engine bays or outdoor industrial enclosures where passive thermal protection is essential.

How does the DS1832+ differ from the DS1821 in terms of functionality?

The DS1832+ is a direct functional and pin-compatible successor to the DS1821, retaining identical 1-Wire command set, register map, EEPROM structure, and TO92/SO packaging. Key enhancements include improved ESD robustness, tighter initial calibration tolerance, and extended qualification for automotive temperature cycling. No firmware or hardware changes are needed when upgrading from DS1821 to DS1832+, making it a drop-in replacement for legacy designs.

Can the DS1832+ operate without an external power supply (VDD)?

No, the DS1832+ requires a valid VDD supply between 2.7V and 5.5V to function - it does not support parasite-power mode like the DS18B20. The DQ pin cannot source current to power the device internally. In thermostat mode, VDD must remain active for continuous temperature conversions and DQ output assertion; removing VDD disables all functionality, including latched THF/TLF flag states.

What is the purpose of the THF and TLF bits in the DS1832+ status register?

The THF (Temperature High Flag) and TLF (Temperature Low Flag) bits in the DS1832+ status/configuration register are nonvolatile latches that record whether the measured temperature has ever exceeded TH or fallen below TL since last reset or clear. Once set to '1', they remain '1' until explicitly written to '0' by the host. These flags enable post-mortem thermal diagnostics - for example, confirming if an industrial controller experienced overheating during unattended operation, even after multiple power cycles.

How do I configure the DS1832+ to power up in thermostat mode?

To configure the DS1832+ to power up in thermostat mode, write '1' to the T/R̄ bit (bit 6) of the status/configuration register using the Write Status [0Ch] command while the device is in 1-Wire mode. This value is stored in nonvolatile EEPROM, so it persists across power cycles. After writing, cycle VDD to apply the change. Once configured, DS1832+ will begin continuous temperature conversions at power-up and assert DQ according to TH/TL thresholds without any host interaction.