Analog Devices Inc. ADT7467ARQ

Overview

ADT7467ARQ from Analog Devices is a thermal monitor and quad-fan PWM controller IC with integrated 10-bit ADC, dual remote diode sensor interface (D1+/D1−, D2+/D2−), on-chip temperature sensor, and SMBus 2.0-compliant serial interface. It delivers ±0.5°C remote sensor accuracy (0°C–70°C), supports high- and low-frequency PWM fan drive (22.5 kHz or 10–100 Hz), and enables dynamic TMIN control for acoustic optimization in server and desktop CPU cooling systems.

For engineers reviewing the ADT7467ARQ datasheet, ADT7467ARQ pinout, ADT7467ARQ application, or ADT7467ARQ equivalent, key selection criteria include remote diode measurement accuracy, SMBus address (0x2E), fail-safe thermal protection via THERM pin, and programmable fan speed limits for noise-sensitive thermal management.

Technical Context

The ADT7467ARQ implements a dual-channel analog front-end with series resistance cancellation (SRC) for remote diode sensing, supporting up to two external thermal diodes with 6 μA/36 μA/96 μA bias currents. Its automatic fan speed control loop uses measured local and remote temperatures to dynamically adjust PWM duty cycles across three dedicated outputs (PWM1–PWM3) and one shared output (PWM3/TACH4).

It integrates an SMBus 2.0 slave interface with fixed 7-bit address 0x2E, THERM bidirectional pin for Intel Pentium 4 PROCHOT monitoring and overtemperature signaling, and GPIO reconfiguration capability on Pin 9. Fail-safe cooling activates at 100°C or 4.6 sec after VCCP power-up if no SMBus transaction occurs.

Key Specifications

Pinout & Package

ADT7467ARQ is housed in a 16-lead QSOP (Quarter Size Outline Package) with 0.65 mm lead pitch and standard JEDEC MO-137AC footprint. Thermal resistance is θJA = 150°C/W and θJC = 39°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADT7460ARQ and NCT7802Y, the ADT7467ARQ uniquely combines dual remote diode sensing with SRC, programmable HF/LF PWM, and fail-safe thermal response-making it the only option among the three capable of autonomous, high-accuracy CPU thermal management in noise-constrained server platforms.

Availability

ADT7467ARQ is available at Aetrix Electronics and suitable for server thermal management, desktop motherboard cooling, and industrial embedded compute modules requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for ADT7467ARQ 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, Inc. is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.

The ADT7467ARQ belongs to Analog Devices' dBCool® family of thermal management ICs, designed specifically for intelligent, low-noise active cooling in x86-based computing platforms with Intel Pentium 4 and later processors.

FAQ

What is the SMBus address of the ADT7467ARQ?

The ADT7467ARQ has a fixed 7-bit SMBus address of 0x2E (0101110 binary), which becomes 0x5C for write operations and 0x5D for read operations when the R/W bit is appended. Unlike earlier variants such as the ADT7460ARQ, this address is not configurable via external pins, eliminating address collision risks in multi-device thermal subsystems and simplifying firmware integration for the ADT7467ARQ.

Does the ADT7467ARQ support both high- and low-frequency PWM fan drive?

Yes, the ADT7467ARQ supports programmable PWM output frequencies: 22.5 kHz for high-frequency operation (reducing audible noise and EMI) or 10–100 Hz for low-frequency mode (compatible with legacy fan controllers). This selection is controlled per channel via Bit 1 of Configuration Register 5, and the default at power-up is high-frequency mode - a key enhancement over the ADT7460ARQ, which supports only low-frequency PWM.

How does the ADT7467ARQ handle remote temperature sensor inaccuracies caused by PCB trace resistance?

The ADT7467ARQ implements Series Resistance Cancellation (SRC) on both remote diode channels (D1+/D1− and D2+/D2−), automatically compensating for linear voltage offset introduced by PCB trace resistance between the thermal diode and sensor pins. This feature improves remote temperature measurement accuracy to ±0.5°C (0°C–70°C), and is absent in the ADT7460ARQ - making the ADT7467ARQ essential for high-fidelity CPU die thermal monitoring in production systems.

What happens if communication with the ADT7467ARQ fails during system operation?

The ADT7467ARQ includes hardware-level fail-safe thermal protection: if no SMBus transaction occurs within 4.6 seconds of VCCP power-up, or if measured temperature exceeds the THERM limit (default 100°C), all PWM outputs automatically drive fans to 100% duty cycle. This autonomous response prevents thermal damage without host intervention - a critical reliability feature absent in basic fan controllers and distinct from the ADT7460ARQ's simpler power-on full-speed behavior.

Can the ADT7467ARQ monitor processor core voltage (VCCP) and use it for thermal decisions?

Yes, the ADT7467ARQ monitors VCCP on Pin 14 (0–3 V range) and uses it to dynamically scale the THERM trip point to 2/3 × VCCP - enabling direct compatibility with Intel Pentium 4 PROCHOT signaling. This allows the ADT7467ARQ to both monitor processor-initiated thermal throttling requests and assert its own overtemperature signal via the same bidirectional THERM pin, a capability not present in the ADT7460ARQ, which monitors only a fixed 2.5 V reference.