Analog Devices Inc. ADM1032ARZ-1

Overview

ADM1032ARZ-1 from Analog Devices is a dual-channel SMBus-compatible digital temperature monitor IC with ±1°C remote and ±3°C local accuracy, 0.125°C remote resolution, and open-drain THERM/ALERT outputs for thermal management in embedded systems. It measures both on-chip ambient temperature and external diode-based remote temperature (e.g., CPU die or 2N3904/06), supporting real-time fan control and CPU throttling.

For engineers reviewing the ADM1032ARZ-1 datasheet, ADM1032ARZ-1 pinout, ADM1032ARZ-1 application, or ADM1032ARZ-1 equivalent, key selection criteria include remote sensor accuracy over 60–100°C, programmable THERM hysteresis, SMBus address (0x4C), 8-lead SOIC package, and 170 μA active supply current - all critical for PC thermal monitoring, smart battery safety, and industrial controller thermal supervision.

Technical Context

The ADM1032ARZ-1 implements a two-current ΔV_BE measurement technique on the remote channel to cancel transistor base-emitter voltage variation, enabling factory-calibration-free operation with ±1°C accuracy across 60°C–100°C. Its on-chip ADC digitizes both local and remote temperatures alternately in free-running mode, storing results in dedicated value registers (0x00, 0x01, 0x02).

Configuration and limit programming occur via SMBus interface (400 kHz max), using an address pointer register to access 16+ on-chip registers including local/remote high/low/THERM limits (0x05–0x08, 0x19–0x21), offset correction (0x11–0x12), and fault queue control (0x22). The THERM output asserts low when either local or remote temperature exceeds its respective THERM limit, independent of ALERT masking.

Key Specifications

Pinout & Package

ADM1032ARZ-1 is housed in an 8-lead SOIC package (body width 3.9 mm, lead pitch 1.27 mm) compliant with JEDEC MS-012AA, rated for θ_JA = 121°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel temperature monitoring applications.

Compared with LM95235CIMM/NOPB and MAX6642AESA+, the ADM1032ARZ-1 uniquely combines SMBus-native dual-output alarm signaling, remote open-circuit detection, and field-programmable THERM hysteresis - making it optimal for PC-class thermal management where bus compatibility and fail-safe behavior are mandatory.

Availability

ADM1032ARZ-1 is available at Aetrix Electronics and suitable for desktop computers, smart batteries, and industrial controllers requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for ADM1032ARZ-1 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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The ADM1032 product line delivers precision dual-channel thermal monitoring ICs designed specifically for PC platform management, server thermal control, and embedded systems requiring SMBus-compliant, low-power temperature supervision with fail-safe outputs.

FAQ

What is the SMBus address of the ADM1032ARZ-1?

The ADM1032ARZ-1 uses a fixed 7-bit SMBus address of 0x4C (1001100b). This differs from the ADM1032-2 variant (0x4D) and is confirmed in the device's ordering guide and functional description. The ADM1032ARZ-1 does not support address pin strapping or software-configurable addressing; multiple units require unique addresses via variant selection (e.g., ADM1032-2) or bus isolation.

Does the ADM1032ARZ-1 support remote temperature sensing with discrete transistors?

Yes, the ADM1032ARZ-1 supports remote sensing using discrete NPN or PNP transistors such as the 2N3904 or 2N3906, as explicitly stated in the General Description and Applications sections. The D+ and D− pins interface directly with the transistor's emitter-base junction, and the internal biasing scheme accommodates substrate diodes or discrete devices without external components under normal conditions.

How does the ADM1032ARZ-1 achieve ±1°C remote accuracy without calibration?

The ADM1032ARZ-1 achieves ±1°C remote accuracy using a two-current ΔV_BE measurement technique that cancels process- and unit-dependent variations in the base-emitter voltage. As described in the Measurement Method section, it measures V_BE at two different currents (I and N×I), extracting temperature from the resulting ΔV_BE proportional to absolute temperature - eliminating the need for per-sensor trimming or system-level calibration.

What is the function of the THERM output on the ADM1032ARZ-1?

The THERM output on the ADM1032ARZ-1 is an open-drain comparator output that asserts low when either the local or remote temperature exceeds its respective programmed THERM limit. Unlike ALERT, THERM requires no masking and resets automatically when measurements return within limits. It is designed for direct connection to CPU THERM# inputs or fan enable lines, enabling hardware-level thermal shutdown without host processor intervention.

Can the ADM1032ARZ-1 operate from a 3.3 V supply?

Yes, the ADM1032ARZ-1 operates from a 3.0 V to 5.5 V supply, with specifications fully characterized at 3.0–3.6 V. The datasheet specifies ±1°C remote accuracy and ±3°C local accuracy under V_CC = 3 V to 3.6 V conditions, and typical operating current is 170 μA at 3.3 V. All digital interfaces (SMBus, ALERT, THERM) are fully functional across this range, including logic thresholds compliant with 3.3 V systems.