Analog Devices Inc. ADM1034ARQ

Overview

ADM1034ARQ from Analog Devices is a dual-channel thermal monitor and fan speed (RPM) controller IC with ±1°C local/remote temperature accuracy, SMBus 2.0/1.1/1.0 compliance, and integrated look-up table-based fan control for desktop PCs and embedded systems.

For engineers reviewing the ADM1034ARQ datasheet, ADM1034ARQ pinout, ADM1034ARQ application, or ADM1034ARQ equivalent, key selection considerations include remote diode sensing capability (2× thermal diodes), programmable THERM I/O timing for PROCHOT assertion, open-drain DRIVE1/DRIVE2 fan drive outputs, and LOCATION-input-configurable SMBus addressing modes.

Technical Context

The ADM1034ARQ implements a dedicated ADC-based temperature measurement system supporting one on-die local sensor and two external thermal diodes (D1+/D1−, D2+/D2−) with series resistance cancellation up to 1 kΩ. It features automatic remote channel calibration and 0.03125°C resolution across all channels.

Its fan control architecture includes dual tachometer inputs (TACH1/TACH2), ±4% RPM measurement accuracy, and configurable linear/discrete temperature-to-fan-speed look-up tables. The THERM pin operates bidirectionally-asserting overtemperature interrupts or accepting PROCHOT signals-with a programmable timer and %-ontime limit register.

Key Specifications

Pinout & Package

ADM1034ARQ is housed in a 16-lead QSOP package (3.9 mm × 4.9 mm, 1.0 mm height) with gull-wing leads and standard JEDEC MO-137AC outline dimensions.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar thermal monitoring and fan control applications.

Compared with ADM1032ARQZ and LM96163CIMTX, the ADM1034ARQ uniquely integrates dual remote diode sensing, PROCHOT-compatible THERM I/O, and autonomous LUT-based fan control in a single QSOP-16 IC-reducing system-level firmware burden and enabling faster thermal response without host intervention.

Availability

ADM1034ARQ is available at Aetrix Electronics and suitable for desktop PCs, notebook PCs, telecommunications equipment, and LCD projectors requiring stable component supply and long-term thermal management continuity.

Supply support for ADM1034ARQ 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, serving industrial, automotive, communications, and computing markets since 1965.

The ADM1034ARQ belongs to Analog Devices' precision thermal monitoring and fan control product line, designed specifically for x86-based computing platforms requiring SMBus-integrated, PROCHOT-compliant thermal management with minimal host processor overhead.

FAQ

What is the primary function of the ADM1034ARQ in a thermal management system?

The ADM1034ARQ serves as a dual-channel thermal monitor and fan speed controller, measuring local ambient temperature plus two remote thermal diodes (e.g., CPU/GPU die) and autonomously regulating two cooling fans via programmable look-up tables. Its integrated THERM I/O directly interfaces with Intel PROCHOT protocols, making ADM1034ARQ essential for coordinated thermal throttling in modern computing platforms without requiring host CPU intervention.

How does the LOCATION pin affect SMBus communication for the ADM1034ARQ?

The LOCATION pin on the ADM1034ARQ is an 8-level analog input that determines both SMBus version (ARP-capable vs. fixed-and-discoverable) and device address. When configured with specific resistor dividers, it sets the SMBus address (0x50–0x53) in fixed mode or defines the LLL bits in the UDID for ARP-capable operation. Because this pin is sampled only at power-up, ADM1034ARQ retains its SMBus identity across runtime-ensuring reliable multi-device bus arbitration without address conflicts.

Can the ADM1034ARQ operate with a 3.3 V supply, and what is its standby current?

Yes, the ADM1034ARQ operates across 3.0 V to 5.5 V, with typical standby current of 900 µA at 3.3 V. This low quiescent draw enables continuous thermal monitoring during system sleep states using standby power rails. Its undervoltage lockout threshold is 2.5 V, ensuring stable operation even under marginal supply conditions commonly found in legacy PC platforms.

What fan control methods does the ADM1034ARQ support, and how are they configured?

The ADM1034ARQ supports both linear ramping and discrete-speed fan control via its internal look-up table (LUT). In linear mode, fan speed changes continuously with temperature; in discrete mode, it jumps between predefined RPM levels. Configuration is performed through SMBus registers-including LUT size, temperature-to-speed mapping, hysteresis, and channel assignment-allowing ADM1034ARQ to deliver quiet acoustics at low loads and rapid cooling under thermal stress without external firmware.

Does the ADM1034ARQ provide fail-safe overtemperature protection independent of SMBus communication?

Yes, the ADM1034ARQ includes a dedicated hardware overtemperature comparator that asserts the THERM output independently of SMBus activity. This fail-safe path ensures immediate thermal shutdown-even if the SMBus interface is disabled, frozen, or disconnected-making ADM1034ARQ suitable for safety-critical applications like telecom infrastructure and industrial controllers where bus reliability cannot be assumed.