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Analog Devices Inc. ADT7467ARQ-REEL7
- Part No.:
- ADT7467ARQ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Thermal Management
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ADT7467ARQ-REEL7.pdf
- Description:
- ANALOG CIRCUIT, 1 FUNC, PDSO16
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
ADT7467ARQ-REEL7 from Analog Devices is a dBCool® remote thermal monitor and quad-fan PWM controller with integrated 10-bit ADC, on-chip + two remote diode temperature sensors (−64°C to +191°C), SMBus 2.0 interface, and bidirectional THERM pin for Intel Pentium 4 PROCHOT monitoring. It drives up to four fans using programmable high-frequency (22.5 kHz) or low-frequency (10–100 Hz) PWM signals and supports 2-/3-/4-wire fan speed measurement.
For engineers reviewing the ADT7467ARQ-REEL7 datasheet, ADT7467ARQ-REEL7 pinout, ADT7467ARQ-REEL7 application, or ADT7467ARQ-REEL7 equivalent, key selection considerations include remote diode accuracy (±0.5°C typical), dynamic TMIN control for acoustic optimization, series resistance cancellation (SRC), fail-safe full-speed fan activation at 100°C THERM limit, and VCCP monitoring for processor core voltage tracking.
Technical Context
The ADT7467ARQ-REEL7 implements a dual-channel remote diode sensing architecture with dedicated current sources (6/36/96 μA) and series resistance cancellation logic to eliminate PCB trace resistance error. Its automatic fan speed control loop uses real-time local/remote temperature inputs to dynamically adjust PWM duty cycles across three independent PWM outputs (PWM1–PWM3), with PWM3 supporting dual-fan drive.
It integrates an SMBus 2.0-compliant serial interface with fixed address 0x2E, interrupt-capable SMBALERT/THERM multiplexed on Pin 9, and configurable GPIO functionality. The device features fail-safe cooling triggered either by exceeding the THERM threshold (100°C) or by absence of SMBus communication within 4.6 sec after VCCP power-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Range | −64°C to +191°C extended range; enables monitoring of high-temp CPUs and GPUs without external scaling. |
| Remote Sensor Accuracy | ±0.5°C (0°C–70°C); ensures precise thermal feedback from CPU/GPU diode junctions for reliable closed-loop fan control. |
| PWM Frequency Options | 22.5 kHz (HF) or 10–100 Hz (LF); HF reduces audible noise, LF enables compatibility with legacy fans. |
| Fan Count Support | Up to 4 fans via TACH1–TACH4 inputs and PWM1–PWM3 outputs (PWM3 drives Fan 3 & Fan 4 in parallel). |
| SMBus Address | Fixed 7-bit address 0x2E; eliminates address conflict risk in multi-device thermal management systems. |
| VCCP Monitoring | 0–3 V analog input on Pin 14; used to derive dynamic THERM trip point (2/3 × VCCP) for adaptive PROCHOT response. |
| Series Resistance Cancellation | Automatically compensates for up to ~1 kΩ trace resistance between remote diode and sensor pins; improves remote temp accuracy in dense PCB layouts. |
Pinout & Package
ADT7467ARQ-REEL7 is housed in a 16-lead QSOP package (5.3 mm × 10.2 mm, 1.0 mm height) with standard 0.635 mm lead pitch and RoHS-compliant matte tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCL (Pin 1) | SMBus Serial Clock Input | Open-drain input requiring external pull-up; synchronizes all register read/write operations per SMBus 2.0 timing. |
| GND (Pin 2) | Power Ground Reference | Primary ground return for analog and digital circuitry; must be low-impedance connection to system GND plane. |
| VCC (Pin 3) | Supply Voltage Input | Accepts 3.0–5.5 V; powers internal circuitry and enables VCC monitoring (attenuated input) for supply health checks. |
| TACH3 (Pin 4) | Fan Speed Input / AIN3 | Open-drain tachometer input for Fan 3; reconfigurable as analog input for 2-wire fan RPM sensing in low-frequency mode. |
| PWM2/SMBALERT (Pin 5) | Fan Control Output / Alert | Open-drain PWM output for Fan 2; can be remapped to SMBALERT interrupt signal for out-of-limit condition reporting. |
| TACH1 (Pin 6) | Fan Speed Input / AIN1 | Open-drain tachometer input for Fan 1; supports analog reconfiguration for 2-wire fan measurement. |
| TACH2 (Pin 7) | Fan Speed Input / AIN2 | Open-drain tachometer input for Fan 2; supports analog reconfiguration for 2-wire fan measurement. |
| PWM3 (Pin 8) | Fan Control Output | Open-drain PWM output driving Fan 3 and Fan 4 in parallel; supports both HF and LF modes with independent duty cycle control. |
| TACH4/GPIO/THERM/SMBALERT (Pin 9) | Multiplexed I/O Terminal | Selectable function: tachometer input (Fan 4), general-purpose I/O, bidirectional THERM (PROCHOT monitor/output), or SMBALERT. |
| D2− (Pin 10) | Remote Diode Cathode 2 | Connects to cathode of second external thermal diode (e.g., GPU or chipset); used with D2+ for remote temperature sensing. |
| D2+ (Pin 11) | Remote Diode Anode 2 | Connects to anode of second external thermal diode; forms differential pair with D2− for accurate remote junction temp measurement. |
| D1− (Pin 12) | Remote Diode Cathode 1 | Connects to cathode of primary remote diode (e.g., CPU); paired with D1+ for first remote channel sensing. |
| D1+ (Pin 13) | Remote Diode Anode 1 | Connects to anode of primary remote diode; completes first remote diode sensing path with D1−. |
| VCCP (Pin 14) | Processor Core Voltage Input | Analog input (0–3 V) for monitoring CPU core rail; used to scale THERM trip threshold dynamically (2/3 × VCCP). |
| PWM1/XTO (Pin 15) | Fan Control Output / Test Mode | Open-drain PWM output for Fan 1; doubles as XNOR tree test output during factory diagnostics. |
| SDA (Pin 16) | SMBus Serial Data I/O | Bidirectional open-drain data line requiring external pull-up; carries all register addresses, values, and SMBus ACK/NACK signals. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic TMIN Control Mode | Intelligently adjusts minimum temperature setpoint based on system load and ambient conditions to minimize fan noise while maintaining safe junction temps. |
| Enhanced Acoustic Mode | Smooths PWM duty cycle transitions using programmable ramp rate to reduce perceptible fan speed changes and mechanical vibration. |
| Fail-Safe Full-Speed Activation | Forces all fans to 100% duty cycle if measured temperature exceeds 100°C THERM limit or if no SMBus command occurs within 4.6 sec of VCCP power-up. |
| Programmable PWM Maximum Duty Cycle | Allows setting upper fan speed limit (e.g., 70%) to cap acoustic output while retaining thermal headroom-unavailable on predecessor ADT7460. |
| Extended Temperature Resolution | 0.25°C resolution across full −64°C to +191°C range enables fine-grained thermal profiling for high-performance computing platforms. |
Applications
| Server CPU Thermal Management | Laptop GPU Cooling Control |
|---|---|
Use Scenario: Real-time monitoring of Intel Xeon CPU die temperature via integrated PROCHOT interface and remote diode sensing. IC Role / Device Role / Timing Role: Primary thermal supervisor coordinating fan speed, THERM signaling, and VCCP-scaled trip thresholds in server motherboard VRM subsystem. Use Value: Prevents thermal throttling during sustained compute loads by maintaining CPU junction below 95°C using dynamic TMIN and fail-safe full-speed activation. | Use Scenario: Dual-diode monitoring of discrete GPU and CPU package temperatures in thin-and-light notebook designs. IC Role / Device Role / Timing Role: Centralized thermal manager interfacing with GPU diode (D1+/D1−), CPU diode (D2+/D2−), and chassis fan tachometers (TACH1–TACH4). Use Value: Enables silent operation under light loads via enhanced acoustic mode and extends battery life by minimizing unnecessary fan activity. |
| Industrial Embedded Controller Cooling | Network Switch ASIC Thermal Protection |
Use Scenario: Active cooling control for ARM-based industrial PLCs operating in extended temperature environments (−40°C to +85°C). IC Role / Device Role / Timing Role: Standalone thermal monitor using local sensor + one remote diode (ASIC junction), with PWM1–PWM3 driving redundant cooling fans. Use Value: Ensures continuous operation at 85°C ambient by leveraging extended −64°C to +191°C range and series resistance cancellation for stable remote readings. | Use Scenario: Protecting 100G Ethernet switch ASICs from thermal runaway during packet burst traffic. IC Role / Device Role / Timing Role: Fail-safe thermal protector using THERM output to trigger ASIC shutdown when remote diode exceeds 110°C. Use Value: Guarantees hardware-level thermal shutdown independent of host firmware, meeting NEBS Level 3 reliability requirements. |
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 |
|---|---|---|---|
| ADT7460ARQZ-REEL7 | No SRC; fixed 10–100 Hz PWM only; −127°C to +127°C range; no VCCP scaling; no GPIO on Pin 9. | Lacks dynamic TMIN, acoustic enhancement, and fail-safe VCCP timeout; suitable only for cost-sensitive legacy designs with lower thermal margins. | Select only if backward register compatibility with ADT7460 firmware is required and extended range/SRC are unnecessary. |
| NCT7802Y (Nuvoton) | 8-channel thermal monitor; no built-in PWM drivers; requires external fan driver ICs; SMBus address selectable (0x28–0x2F). | Higher channel count but no integrated fan control; better suited for multi-zone monitoring where fan drivers are discrete or integrated elsewhere. | Choose when system requires >2 remote sensors and fan control is handled by separate motor drivers or microcontroller PWM peripherals. |
Compared with ADT7467ARQ-REEL7, ADT7460ARQZ-REEL7 lacks critical reliability features like fail-safe timeout and series resistance cancellation, while NCT7802Y shifts fan control complexity to external components-making ADT7467ARQ-REEL7 the optimal choice for compact, self-contained thermal management in space-constrained servers and embedded systems.
Availability
ADT7467ARQ-REEL7 is available at Aetrix Electronics and suitable for server motherboard design, laptop thermal subsystem integration, and industrial embedded controller cooling requiring stable component supply, long-term lifecycle support, and guaranteed RoHS compliance.
Supply support for ADT7467ARQ-REEL7 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 ADT7467ARQ-REEL7 belongs to the dBCool® family of thermal management ICs, engineered specifically for noise-sensitive computing platforms requiring intelligent, autonomous fan control and robust thermal protection in x86 and ARM-based systems.
FAQ
What is the maximum remote temperature measurement range supported by the ADT7467ARQ-REEL7?
The ADT7467ARQ-REEL7 supports an extended remote temperature measurement range of −64°C to +191°C. This range is enabled by default (Bit 0 of Configuration Register 5 = 1) and allows accurate monitoring of high-temperature processors and GPUs. The device also maintains backward compatibility with the −127°C to +127°C range of the ADT7460 when Bit 0 is cleared, though ADT7467ARQ-REEL7's full specification is validated across the wider span.
Does the ADT7467ARQ-REEL7 support both high-frequency and low-frequency PWM fan drive signals?
Yes, the ADT7467ARQ-REEL7 supports programmable PWM frequencies: high-frequency mode at 22.5 kHz (default, Bit 1 of Configuration Register 5 = 0) and low-frequency mode adjustable between 10 Hz and 100 Hz (Bit 1 = 1). This dual-mode capability enables quieter operation with modern fans while retaining compatibility with legacy 2-wire fans that require low-frequency drive signals.
How does the series resistance cancellation (SRC) feature improve remote temperature accuracy in the ADT7467ARQ-REEL7?
The ADT7467ARQ-REEL7 implements hardware-based series resistance cancellation (SRC) on both remote diode channels (D1+/D1− and D2+/D2−) to automatically compensate for linear offset errors introduced by PCB trace resistance-up to approximately 1 kΩ. This eliminates manual calibration and ensures ±0.5°C accuracy over 0°C–70°C even in compact, high-density layouts where routing resistance would otherwise degrade thermal feedback fidelity.
What fail-safe mechanisms does the ADT7467ARQ-REEL7 provide to prevent system overheating?
The ADT7467ARQ-REEL7 provides two independent fail-safe mechanisms: (1) automatic full-speed fan activation when any monitored temperature exceeds the programmable THERM limit (default 100°C), and (2) forced full-speed operation if no SMBus transaction occurs within 4.6 seconds after VCCP power-up. Both ensure thermal protection remains active even during firmware hangs or bus failures, making ADT7467ARQ-REEL7 suitable for mission-critical infrastructure.
Can the THERM pin on the ADT7467ARQ-REEL7 be used both as an input and output?
Yes, the THERM pin (multiplexed on Pin 9) operates bidirectionally in the ADT7467ARQ-REEL7. As an input, it monitors Intel Pentium 4 PROCHOT or external trip-point signals; as an output, it asserts an overtemperature condition to shut down or throttle the host processor. Function selection is controlled via Configuration Register 4 (Address 0x7D, Bits 0–1), and the pin retains open-drain characteristics in both modes for safe wired-OR interfacing.
ADT7467ARQ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- dBCool®
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Fan Control, Temp Monitor
- Sensor Type:
- Internal and External
- Sensing Temperature:
- -40°C ~ 120°C, External Sensor
- Accuracy:
- ±1.5°C
- Topology:
- ADC, Comparator, Fan Speed Counter, Multiplexer, Register Bank
- Output Type:
- SMBus
- Output Alarm:
- No
- Output Fan:
- Yes
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 120°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
ADT7467ARQ-REEL7 FAQ
1.How can I place an order for ADT7467ARQ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADT7467ARQ-REEL7 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 ADT7467ARQ-REEL7 reliable?
The price and inventory of ADT7467ARQ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADT7467ARQ-REEL7 is usually 5 days.
3.What payment methods are accepted for ADT7467ARQ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADT7467ARQ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADT7467ARQ-REEL7?
ADT7467ARQ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADT7467ARQ-REEL7 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 ADT7467ARQ-REEL7?
For technical support, including ADT7467ARQ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADT7467ARQ-REEL7 requirements.
6.How does Aetrix verify that ADT7467ARQ-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADT7467ARQ-REEL7 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 ADT7467ARQ-REEL7 meets industry standards.
7.What is the process for return or replacement of ADT7467ARQ-REEL7?
All ADT7467ARQ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADT7467ARQ-REEL7, 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 ADT7467ARQ-REEL7 part is unused and in its original packaging.
Return procedure for ADT7467ARQ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADT7467ARQ-REEL7 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
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SE98ATP,547
NXP Semiconductors
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AMC6821SDBQR
Texas Instruments
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MAX6604AATA+T
Analog Devices Inc./Maxim Integrated
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ADT7475ARQZ-REEL
onsemi
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MAX6643LBBAEE+
Analog Devices Inc./Maxim Integrated
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MAX6684ESA+T
Analog Devices Inc./Maxim Integrated
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MAX6639AEE+
Analog Devices Inc./Maxim Integrated
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