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Analog Devices Inc. ADT7476ARQZ-REEL
- Part No.:
- ADT7476ARQZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Thermal Management
- Package:
- -
- Datasheet:
-
ADT7476ARQZ-REEL.pdf
- Description:
- MULTICH TDM FAN CNTRLR
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Product details
Overview
ADT7476ARQZ-REEL from Analog Devices is a dBCool® remote thermal controller and voltage monitor IC designed for active cooling management in noise- and power-sensitive computing systems. It monitors up to 5 voltages (+12V, +5V, +2.5V, VCCP, VCC), measures temperature via 1 on-chip and 2 remote diode sensors (−40°C to +125°C local accuracy ±1.5°C), controls 4 fans via PWM outputs (HF/LF configurable), and interfaces via SMBus 2.0. It delivers thermal protection through the bidirectional THERM pin and supports Intel Pentium 4 PROCHOT monitoring.
For engineers reviewing the ADT7476ARQZ-REEL datasheet, ADT7476ARQZ-REEL pinout, ADT7476ARQZ-REEL application, or ADT7476ARQZ-REEL equivalent, key selection criteria include its 24-pin QSOP package, dual remote diode support, 0.25°C temperature resolution, automatic fan speed control loop with acoustic enhancement, and integrated VID code monitoring for CPU voltage tracking.
Technical Context
The ADT7476ARQZ-REEL implements a closed-loop thermal management system using a 10-bit ADC with ±1.5% TUE on voltage channels and ±0.5°C/±1.5°C local/remote temperature accuracy. Its automatic fan control algorithm dynamically adjusts PWM duty cycle per temperature zone, with TRANGE defining true temperature range-not slope-and THERM enabled per channel individually.
It integrates three independent tachometer inputs (TACH1–TACH3) and one shared TACH4/THERM/SMBALERT pin, supports 3-wire and 4-wire fan measurement, and provides programmable GPIOs (VID0–VID5/GPIO0–GPIO6) for CPU VID readback and general-purpose I/O. The device operates from 3.0 V to 3.6 V, draws 1.5–3 mA supply current, and meets SMBus 2.0 electrical specifications with 10–400 kHz clock frequency support.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0 V to 3.6 V - Enables operation from standard 3.3 V standby rail with margin for voltage droop. |
| Local Temp Accuracy | ±1.5°C (−40°C to +125°C) - Ensures reliable junction temperature monitoring for processor thermal throttling decisions. |
| Remote Diode Accuracy | ±1.5°C (0°C to +85°C), ±2.5°C (−40°C to +125°C) - Supports precise external die temperature sensing using standard CPU/ASIC diodes. |
| Fan Control Outputs | 4 PWM channels (PWM1–PWM3 + PWM3/TACH4 multiplexed) - Drives up to four fans with independent high/low frequency mode selection. |
| Voltage Monitoring | 5 analog inputs (+12VIN, +5VIN, +2.5VIN, VCCP, VCC) - Covers core server/desktop power rails including processor core voltage (0–3 V range). |
| SMBus Interface | 7-bit address (0x2C/0x2D/0x2E), 10–400 kHz - Allows multi-device bus configuration without address conflict; compatible with Intel ICH-hosted SMBus controllers. |
| THERM Pin Function | Bidirectional - Configurable as input to monitor PROCHOT from Pentium 4 or output to assert system overtemperature shutdown. |
Pinout & Package
ADT7476ARQZ-REEL is housed in a 24-lead QSOP package (5.3 mm × 7.6 mm, 0.65 mm pitch), optimized for compact motherboard placement near CPU and VRMs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SDA) | SMBus Serial Data I/O | Open-drain bidirectional data line; requires external pull-up; enables register read/write and interrupt signaling via SMBALERT reconfiguration. |
| 2 (SCL) | SMBus Serial Clock Input | Open-drain clock input; synchronizes all SMBus transactions; supports up to 400 kHz timing per SMBus 2.0 spec. |
| 4 (VCC) | Power Supply Input | 3.3 V nominal supply; also monitored internally for brown-out detection and system health reporting. |
| 5–9, 19 (VID0–VID4/GPIO0–GPIO4) | CPU VID Code Inputs / GPIO | Reads 5-bit CPU voltage ID codes into register 0x43; each pin doubles as open-drain general-purpose I/O for status signaling or control. |
| 9, 11–12, 14 (TACH1–TACH4) | Fan Tachometer Inputs | Open-drain digital inputs measuring fan RPM via pulse counting; support 3-wire and 4-wire fan types with ±6% accuracy at 0°C–70°C. |
| 10, 24 (PWM2, PWM1) | Fan Speed Control Outputs | Open-drain PWM outputs driving fan MOSFETs; require 10 kΩ pull-up; configurable for high-frequency (quiet operation) or low-frequency (efficiency) drive. |
| 13 (PWM3/ADDREN) | Address Enable / Fan Control | Pulled high for default SMBus address 0x2E; pulled low to enter address select mode where Pin 14 defines alternate address (0x2C or 0x2D). |
| 15–18, 22 (D1+/D1−, D2+/D2−, +2.5VIN/THERM) | Remote Diode / Voltage / THERM | D1+/D1− and D2+/D2− connect to two external thermal diodes; +2.5VIN monitors chipset voltage; THERM pin is bidirectional for PROCHOT input or overtemp output. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Fan Speed Control Loop | Per-channel temperature-based PWM adjustment with user-programmable TTHERM, THYST, and TRANGE registers-reduces acoustic noise while maintaining safe thermal margins. |
| Enhanced Acoustic Mode | Temperature-zone-based smoothing (not fan-based) with increased filter times-minimizes perceptible fan speed transitions during dynamic load changes. |
| Triple Temperature Sensing | On-die sensor + two remote diode channels (−40°C to +191°C extended range)-enables simultaneous monitoring of CPU, GPU, and ambient or heatsink temperatures. |
| Integrated VID Monitoring | 6-bit VID input (VID0–VID5) captures real-time CPU core voltage settings-supports dynamic VDD scaling verification and power optimization in x86 platforms. |
| Bidirectional THERM Pin | Configurable as input to detect Intel PROCHOT assertion or as output to trigger hardware thermal shutdown-provides fail-safe protection without host software dependency. |
| SMBus 2.0 Compliance | Guaranteed timing (10–400 kHz), glitch immunity (50 ns), and bus timeout (15–35 ms)-ensures robust communication in electrically noisy server and desktop environments. |
Applications
| Server CPU Thermal Management | Desktop Motherboard Power Monitoring |
|---|---|
|
Use Scenario: Real-time thermal regulation of dual-socket Xeon servers under variable compute loads. IC Role / Device Role / Timing Role: Primary thermal controller interfacing with CPU PROCHOT, monitoring VRM output (VCCP), and driving chassis fans via PWM1–PWM3. Use Value: Maintains CPU junction temperature ≤85°C while reducing fan noise by 8–12 dBA through acoustic enhancement and zone-based smoothing. |
Use Scenario: Integrated voltage and temperature supervision on ATX motherboards supporting Intel Core i-series processors. IC Role / Device Role / Timing Role: Monitors +12V/+5V/+2.5V rails, reads CPU VID lines (VID0–VID5), and controls CPU cooler fan speed based on internal die temperature. Use Value: Enables BIOS-level thermal throttling response within 145 ms full monitoring cycle (averaging enabled), meeting Intel Thermal Monitor 2 timing requirements. |
| Industrial Embedded Controller Cooling | Network Appliance Fan Control |
|
Use Scenario: Fan-cooled industrial PC operating in −40°C to +85°C ambient with extended reliability requirements. IC Role / Device Role / Timing Role: Remote diode (D1+/D1−) tracks FPGA junction temp; TACH1–TACH3 verify fan presence and speed; THERM output triggers hardware reset on overtemperature. Use Value: Achieves ±2.5°C remote accuracy across full industrial temperature range, ensuring safe operation without software intervention. |
Use Scenario: 1U rack-mount network switch requiring silent operation in office environments. IC Role / Device Role / Timing Role: Controls front/rear chassis fans (PWM1/PWM2) and CPU fan (PWM3) using enhanced acoustic mode; monitors ambient temp via D2+/D2− diode. Use Value: Reduces audible fan modulation by >50% compared to fixed-speed control, verified via tachometer feedback and real-time PWM adjustment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thermal monitoring and fan control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADT7475ARQZ-REEL | Lacks THERM bidirectional functionality and PROCHOT monitoring; no VID5 input; only 3 fan tach inputs (TACH1–TACH3). | Suitable for simpler embedded systems without Intel CPU integration or hardware thermal shutdown requirements. | Select when PROCHOT interface and full 4-fan monitoring are unnecessary-reduces BOM cost and firmware complexity. |
| NCT7802Y | Offers 6 voltage monitors vs. 5; includes watchdog timer; lacks VID monitoring and THERM pin; uses I²C (not SMBus-specific) interface. | Better suited for non-x86 platforms (ARM, RISC-V) where CPU VID and PROCHOT are irrelevant. | Choose for ARM-based industrial gateways needing watchdog capability and broader voltage coverage-but requires SMBus-to-I²C compatibility validation. |
Compared with ADT7476ARQZ-REEL, ADT7475ARQZ-REEL omits critical x86-specific features like PROCHOT and VID5, while NCT7802Y trades SMBus compliance and thermal safety functions for general-purpose monitoring flexibility-making ADT7476ARQZ-REEL the optimal choice for Intel platform thermal integrity.
Availability
ADT7476ARQZ-REEL is available at Aetrix Electronics and suitable for server motherboard design, desktop thermal management, industrial embedded controller cooling, and network appliance fan control requiring stable component supply and long-term lifecycle support.
Supply support for ADT7476ARQZ-REEL 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The ADT7476ARQZ-REEL belongs to Analog Devices' dBCool® family of thermal management ICs, engineered specifically for intelligent, low-noise active cooling in x86 computing platforms-from entry-level desktops to high-density servers.
FAQ
What is the primary function of the ADT7476ARQZ-REEL in a computing system?
The ADT7476ARQZ-REEL serves as a dedicated thermal and power supervisor IC that monitors up to five voltage rails, measures temperature via one on-chip and two remote diode sensors, and controls up to four fans using programmable PWM outputs. Its core function is to maintain safe operating temperatures in x86 platforms-especially those with Intel Pentium 4 or later CPUs-by implementing automatic fan speed control, PROCHOT monitoring, and hardware-based thermal shutdown via the THERM pin. This ensures system reliability without relying solely on host software.
Does the ADT7476ARQZ-REEL support both high-frequency and low-frequency PWM fan drive modes?
Yes, the ADT7476ARQZ-REEL supports both high-frequency (HF) and low-frequency (LF) PWM fan drive modes on each of its PWM1, PWM2, and PWM3 outputs. HF mode reduces audible fan noise by shifting switching energy above human hearing range, while LF mode improves power efficiency in thermally stable conditions. Configuration is done per-output via dedicated PWM configuration registers, enabling mixed-mode operation-for example, HF for CPU fan and LF for chassis fans-to balance acoustic performance and efficiency.
How does the ADT7476ARQZ-REEL handle remote temperature sensing accuracy across temperature extremes?
The ADT7476ARQZ-REEL achieves ±1.5°C accuracy for remote diode measurements between 0°C and +85°C, and ±2.5°C from −40°C to +125°C. This is realized through dual-switching-current remote diode measurement (180 μA high level / 11 μA low level), which compensates for series resistance and leakage effects. Performance curves in the datasheet (Figures 4–7) confirm stability against PCB parasitics, common-mode/differential noise, and power supply ripple-ensuring repeatable readings even in electrically noisy server environments where the ADT7476ARQZ-REEL is commonly deployed.
Can the ADT7476ARQZ-REEL be used without an SMBus master controller?
No-the ADT7476ARQZ-REEL requires an SMBus master (typically an Intel ICH, AMD SB, or dedicated microcontroller) to configure registers, read sensor data, and update PWM settings. It has no autonomous operation mode: all fan control logic, limit comparisons, and interrupt generation depend on register programming via SMBus. While it can monitor voltages and temperatures continuously once configured, initial setup-including address assignment (0x2C/0x2D/0x2E), THERM mode selection, and TRANGE calibration-must be performed by the host system before thermal management becomes active.
What is the role of the VID0–VID5 pins on the ADT7476ARQZ-REEL?
The VID0–VID5 pins on the ADT7476ARQZ-REEL capture the 6-bit voltage identification code output by Intel and AMD CPUs to indicate their requested core voltage (VDD). These signals are latched into register 0x43 and used by system firmware to validate VRM output accuracy, correlate thermal events with voltage states, and enable adaptive fan control based on combined thermal/voltage load. Unlike generic GPIOs, VID inputs are hardwired to internal decoding logic-making ADT7476ARQZ-REEL uniquely suited for x86 platform power integrity analysis.
ADT7476ARQZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- -
- Sensor Type:
- -
- Sensing Temperature:
- -
- Accuracy:
- -
- Topology:
- -
- Output Type:
- -
- Output Alarm:
- -
- Output Fan:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
ADT7476ARQZ-REEL FAQ
1.How can I place an order for ADT7476ARQZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADT7476ARQZ-REEL on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADT7476ARQZ-REEL reliable?
The price and inventory of ADT7476ARQZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADT7476ARQZ-REEL is usually 5 days.
3.What payment methods are accepted for ADT7476ARQZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADT7476ARQZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADT7476ARQZ-REEL?
ADT7476ARQZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADT7476ARQZ-REEL order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADT7476ARQZ-REEL?
For technical support, including ADT7476ARQZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADT7476ARQZ-REEL requirements.
6.How does Aetrix verify that ADT7476ARQZ-REEL is sourced from the original manufacturer or authorized distributors?
All ADT7476ARQZ-REEL products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADT7476ARQZ-REEL meets industry standards.
7.What is the process for return or replacement of ADT7476ARQZ-REEL?
All ADT7476ARQZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADT7476ARQZ-REEL, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADT7476ARQZ-REEL part is unused and in its original packaging.
Return procedure for ADT7476ARQZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADT7476ARQZ-REEL Tags
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EMC2101-ACZL-TR
Microchip Technology
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MCP9844T-BE/MNY
Microchip Technology
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EMC2101-R-ACZL-TR
Microchip Technology
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MCP98244T-BE/MNY
Microchip Technology
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TC670ECHTR
Microchip Technology
-
SE98ATP,547
NXP Semiconductors
-
AMC6821SDBQR
Texas Instruments
-
MAX6604AATA+T
Analog Devices Inc./Maxim Integrated
-
ADT7475ARQZ-REEL
onsemi
-
MAX6643LBBAEE+
Analog Devices Inc./Maxim Integrated
-
MAX6684ESA+T
Analog Devices Inc./Maxim Integrated
-
MAX6639AEE+
Analog Devices Inc./Maxim Integrated
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