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 thermostat and 1-Wire communication modes.

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, factory-default 1-Wire mode, user-programmable T/R¯ bit for power-up mode selection, EEPROM-stored thermostat thresholds, and SO-8 package compatibility with tape-and-reel logistics for automated assembly.

Technical Context

The DS1832S/T&R implements a proprietary direct-to-digital temperature sensor using dual oscillators-one low-temp-co and one high-temp-co-to generate 8-bit centigrade values via iterative counter presetting and slope compensation. Its 1-Wire interface operates on a single open-drain DQ line with external 4.7kΩ pullup, requiring strict timing for reset, presence, read, and write slots.

Two distinct 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 temperature, TH/TL, and status registers; in thermostat mode (T/R¯ = 1), DQ becomes an open-drain output that asserts when temperature exceeds TH and deasserts below TL, with polarity selectable via the POL bit.

Key Specifications

Pinout & Package

DS1832S/T&R is supplied in an 8-pin SO (208-mil) surface-mount package with lead(Pb)-free/RoHS-compliant finish, optimized for reflow soldering and automated placement.

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 greater resolution but lacks guaranteed single-device simplicity and true standalone operation, while LM75BIMM/NOPB demands host intervention for all thermal decisions and adds interface overhead - DS1832S/T&R uniquely balances autonomy, minimal footprint, and deterministic behavior.

Availability

DS1832S/T&R is available at Aetrix Electronics and suitable for industrial temperature monitoring, consumer appliance safety controls, and embedded environmental sensing requiring stable component supply, RoHS-compliant packaging, and tape-and-reel delivery for SMT production.

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, and communications applications.

The DS1832S/T&R 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 default power-up mode of the DS1832S/T&R?

The DS1832S/T&R powers up in 1-Wire mode (T/R¯ = 0) by default, as shipped from the factory. This allows immediate communication via the DQ pin for configuration before switching to thermostat mode. The T/R¯ bit is stored in nonvolatile EEPROM, so any user-programmed change to thermostat mode persists across power cycles. DS1832S/T&R retains its last configured mode unless explicitly rewritten.

Can the DS1832S/T&R operate without a VDD connection?

No, the DS1832S/T&R requires a valid VDD supply between 2.7V and 5.5V to function - it does not support parasite-power operation like some other 1-Wire devices (e.g., DS18B20). The VDD pin must be connected to a stable voltage source; leaving it unconnected will prevent temperature conversion, EEPROM access, and thermostat output assertion. DS1832S/T&R relies on VDD for internal oscillator bias and memory retention.

How is hysteresis implemented in the DS1832S/T&R thermostat mode?

Hysteresis in DS1832S/T&R is implemented via independent, user-programmable TH (high threshold) and TL (low threshold) registers stored in EEPROM. When temperature exceeds TH, DQ asserts; it remains asserted until temperature falls below TL. The difference (TH − TL) defines hysteresis width - e.g., TH = +40°C and TL = +35°C yields 5°C hysteresis. DS1832S/T&R maintains this behavior autonomously without host interaction once configured.

Does the DS1832S/T&R support high-resolution temperature readings beyond 1°C?

Yes, DS1832S/T&R supports sub-degree resolution using the counter and slope accumulator registers. After a standard 8-bit temperature read, the Read Counter [A0h] and Load Counter [41h] commands retrieve residual counts and slope values needed for the documented interpolation equation. This yields calculated values with ~0.1°C effective resolution - but only in one-shot mode, as continuous conversion disables high-res access. DS1832S/T&R provides this capability without external computation hardware.

What is the function 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 latches indicating whether temperature has ever exceeded TH or fallen below TL since last clear. THF = 1 means "temperature was once > TH"; TLF = 1 means "temperature was once < TL". Both retain state across power cycles and must be manually cleared by writing 0. DS1832S/T&R uses these flags for post-event diagnostics and thermal history logging without host polling.