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, providing 8-bit (1°C resolution) temperature measurements with ±1°C accuracy over 0°C to +85°C, and converting temperature 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, this page delivers verified technical context, pin-level design meaning, real-world application cards, and two confirmed alternative parts for thermal sensing and thermostat applications requiring single-wire communication and EEPROM-programmable thresholds.

Technical Context

The DS1832S implements a proprietary direct-to-digital temperature sensor using dual-oscillator architecture: a low-temp-co oscillator drives a preset counter, while a high-temp-co oscillator defines the gate period; temperature is derived iteratively by incrementing the register until counter timeout aligns with gate duration. Its 1-Wire interface uses open-drain DQ with 4.7 kΩ pull-up, supporting only single-drop configuration due to lack of device addressing.

Two mutually exclusive operating modes are controlled by the nonvolatile T/R¯ bit: in 1-Wire mode (T/R¯ = 0), DQ serves as bidirectional data I/O for reading/writing TH/TL registers, status/config, and temperature; in thermostat mode (T/R¯ = 1), DQ acts as a polarity-selectable (POL bit) open-drain output that asserts when temperature exceeds TH and deasserts below TL, with hysteresis defined by Δ(TH–TL).

Key Specifications

Pinout & Package

DS1832S is supplied in an 8-pin SO (208-mil) surface-mount package with GND, DQ, VDD, and five NC pins. Pin 1 is DQ (Data In/Out and Thermostat Output), Pin 2 is GND, Pin 3 is VDD; Pins 4–8 are No Connect.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1832S, DS18B20+ offers superior resolution and bus scalability but forfeits autonomous thermostat operation, while LMT70AYPWR delivers faster analog response yet requires full external signal conditioning - DS1832S uniquely balances self-contained thermal decision-making with minimal system integration overhead.

Availability

DS1832S is available at Aetrix Electronics and suitable for industrial motor protection, smart appliance thermostats, medical diagnostic equipment, environmental data loggers, and remote thermal monitoring systems requiring stable component supply and long-term lifecycle support.

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

The DS1832S belongs to Maxim's 1-Wire temperature sensor family, engineered specifically for applications demanding low-pin-count thermal sensing with integrated decision-making capability - eliminating host processing overhead in resource-constrained systems.

FAQ

What is the primary function of the DS1832S?

The DS1832S is a programmable digital thermostat and thermometer IC that operates either as an 8-bit temperature sensor with 1-Wire interface or as a standalone thermostat with user-defined trip-points stored in nonvolatile EEPROM. Its core function is to measure temperature from –55°C to +125°C with ±1°C accuracy over 0°C to +85°C and trigger hardware-level output (DQ pin) when thresholds are exceeded - all without requiring continuous host MCU supervision. This dual-mode capability makes DS1832S ideal for both sensor-readout and autonomous thermal protection roles.

How does the DS1832S differ from the DS18B20+?

The DS1832S differs from the DS18B20+ in three key ways: first, DS1832S supports true standalone thermostat mode (T/R¯ = 1) with EEPROM-stored TH/TL registers and polarity-selectable DQ output, whereas DS18B20+ lacks autonomous operation and requires constant MCU interaction; second, DS1832S provides fixed 8-bit (1°C) resolution versus DS18B20+'s 12-bit (0.0625°C) output; third, DS1832S is single-drop only on 1-Wire, while DS18B20+ supports multi-drop networks. DS1832S is optimized for simplicity and autonomy; DS18B20+ for resolution and scalability.

Can the DS1832S operate without an external power supply (VDD)?

No, the DS1832S cannot operate in parasite-power mode and requires a dedicated VDD supply between 2.7V and 5.5V. Unlike some 1-Wire devices (e.g., DS18B20+), DS1832S lacks internal charge-pump circuitry to harvest power from the DQ line. The VDD pin must be connected to a stable DC source, and the GND pin must provide a low-impedance return path. Omitting VDD will prevent initialization, temperature conversion, EEPROM writes, and thermostat output assertion - the DS1832S will remain nonfunctional.

What is the role of the THF and TLF bits in the DS1832S status register?

The THF (Temperature High Flag) and TLF (Temperature Low Flag) bits in the DS1832S status/configuration register are nonvolatile flags that record thermal excursion history: THF is set to 1 if the measured temperature has ever exceeded the TH register value, and TLF is set to 1 if it has ever fallen below the TL register value - both persist across power cycles until explicitly cleared by the host. These flags enable post-event diagnostics in fielded equipment, such as verifying whether a thermal fault occurred during unattended operation. They function identically in both 1-Wire and thermostat modes and are stored in EEPROM alongside TH, TL, and configuration bits.

How do I configure the DS1832S to power up in thermostat mode?

To configure the DS1832S to power up in thermostat mode, write a 1 to the T/R¯ bit (bit 6) of the status/configuration register using the Write Status [0Ch] command while the device is in 1-Wire mode, then verify the change with Read Status [ACh]. Since T/R¯ is stored in nonvolatile EEPROM, this setting persists across power cycles. After programming, cycle power to confirm DS1832S enters thermostat mode: DQ will assert (high or low per POL bit) when temperature exceeds TH and deassert when below TL. Note that temporary switching to 1-Wire mode during thermostat operation (via VDD toggle + 16 DQ clocks) does not alter the stored T/R¯ value - only a new Write Status command changes the default boot mode.