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, 8-bit (1°C) resolution, and standalone thermostat functionality using user-defined TH/TL trip-points. It serves as a system-level thermal monitor in embedded control loops requiring minimal external components.

For engineers reviewing the DS1832 datasheet, DS1832 pinout, DS1832 application, or DS1832 equivalent, key selection criteria include its single-pin 1-Wire bus compatibility, nonvolatile trip-point storage, dual-mode operation (thermostat vs. sensor), open-drain DQ output polarity control, and TO92/SO package options for space-constrained thermal sensing nodes.

Technical Context

The DS1832 implements a proprietary direct-to-digital temperature sensor using dual-oscillator architecture - one low-temp-co oscillator for counting and one high-temp-co oscillator defining gate period - enabling centigrade measurement without calibration. Its 1-Wire interface uses strict timing-controlled read/write slots and reset/presence pulses, with DQ serving as both bidirectional data line and open-drain thermostat output.

Two nonvolatile EEPROM registers (TH and TL) store user-defined trip-points, while the status/configuration register holds T/R¯ (power-up mode), POL (DQ polarity), 1SHOT (conversion mode), and THF/TLF flags. All EEPROM writes require up to 10 ms and are monitored via the NVB bit; continuous conversion completes in ≤1 second.

Key Specifications

Pinout & Package

DS1832 is available in 3-pin TO92 and 8-pin SO (208-mil) packages. Both variants share identical pin functions but differ in pin count and layout due to NC pins in SO version.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS18B20 and LMT70AIDSC, the DS1832 uniquely combines autonomous thermostat operation, nonvolatile trip-point storage, and single-wire digital interface - making it the only option among the three that eliminates host intervention for thermal switching tasks.

Availability

DS1832 is available at Aetrix Electronics and suitable for industrial motor protection, medical thermometry, smart HVAC control, and server rack thermal management requiring stable component supply across extended temperature ranges and long production lifecycles.

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) designs precision analog, mixed-signal, and digital ICs for industrial, communications, computing, and consumer applications.

The DS1832 belongs to Maxim's 1-Wire temperature sensor family, engineered specifically for applications demanding autonomous thermal control with minimal external components and robust operation across extreme temperatures.

FAQ

What is the primary function of the DS1832 in thermostat mode?

The DS1832 functions as a standalone thermostat in thermostat mode, continuously converting temperature and asserting its open-drain DQ pin when measured temperature exceeds the TH register value, holding active until temperature falls below the TL register value. This behavior requires no host processor interaction and relies on nonvolatile EEPROM-stored trip points programmed earlier in 1-Wire mode.

Does the DS1832 require an external power supply in all configurations?

Yes, the DS1832 requires a VDD supply between 2.7V and 5.5V for normal operation in both 1-Wire and thermostat modes. Unlike some 1-Wire devices (e.g., DS18B20), it does not support parasite-power operation - the VDD pin must be connected to a valid supply; leaving it unpowered will disable temperature conversion and thermostat output.

How is temperature data formatted in the DS1832's temperature register?

Temperature data in the DS1832 is stored as an 8-bit two's complement value in the temperature register, providing 1°C resolution across –55°C to +125°C. Bit 7 is the sign bit: 0 indicates positive temperature, 1 indicates negative. For example, 0x00 = 0°C, 0xFF = –1°C, and 0xC9 = –55°C - all values directly readable via the Read Temperature [AAh] command.

Can the DS1832 operate in both thermostat and 1-Wire modes simultaneously?

No, the DS1832 operates exclusively in one mode at a time, selected by the T/R¯ bit in its status/configuration register. When T/R¯ = 0, it powers up in 1-Wire mode for sensor readout and configuration; when T/R¯ = 1, it powers up in thermostat mode for autonomous switching. Mode switching requires reprogramming the T/R¯ bit via 1-Wire commands or power cycling after temporary mode entry.

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 are nonvolatile status indicators that record whether the DS1832 has ever exceeded the TH or fallen below the TL trip point since last cleared. THF = 1 means temperature exceeded TH at least once; TLF = 1 means it dropped below TL. Both retain state across power cycles and are cleared only by explicit write - enabling thermal event logging in maintenance-sensitive systems.