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Analog Devices Inc. ADT7466ARQZ-REEL
- Part No.:
- ADT7466ARQZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Thermal Management
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ADT7466ARQZ-REEL.pdf
- Description:
- ANALOG CIRCUIT, 1 FUNC, PDSO16
- Quantity:
- Payment:
- Shipping:
Inventory:7,132
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Product details
Overview
ADT7466ARQZ-REEL from Analog Devices is a dBCool® remote thermal controller and voltage monitor IC with dual 8-bit DAC fan drive outputs, SMBus 1.1 interface, ±1°C local/remote temperature accuracy (20°C–60°C), and integrated series resistance cancellation up to 2 kΩ for diode-based sensing. It serves as a system-level thermal management engine in noise-sensitive notebook PCs.
For engineers reviewing the ADT7466ARQZ-REEL datasheet, ADT7466ARQZ-REEL pinout, ADT7466ARQZ-REEL application, or ADT7466ARQZ-REEL equivalent, key selection considerations include its dual-fan PWM control capability, PROCHOT/THERM configurable pin 7, 3-wire tachometer inputs, REFOUT 2.25 V reference output, and support for thermistor + remote diode + on-chip sensor concurrent monitoring.
Technical Context
The ADT7466ARQZ-REEL implements a closed-loop automatic fan speed control (AFC) architecture that links temperature measurements (local, two remote diodes, two thermistors) to two independent 8-bit DAC outputs (DRIVE1/DRIVE2) with monotonicity and ±5% total unadjusted error. Its SMBus 1.1 slave interface uses fixed 7-bit address 0x4C (0x98 write / 0x99 read) and supports PEC, timeout disable, and ALERT interrupt signaling.
It integrates a 10-bit ADC with 0.25°C resolution, sequential multi-channel measurement (68–91 ms full cycle), series resistance cancellation for D1+/D1− and D2+/D2− paths, and configurable pin functionality-pin 7 supports FAN1_ON, PROCHOT input, or THERM output; pins 11/12 support AIN/TH/D2− or AIN/TH/D2+ roles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0 V to 5.5 V - Supports direct connection to 3.3 V or 5 V rails without level shifting. |
| Local Temp Accuracy | ±1°C (20°C–60°C) - Enables precise ambient thermal feedback for CPU/GPU proximity monitoring. |
| Remote Diode Accuracy | ±1°C (20°C–60°C, −40°C ≤ TD ≤ +125°C) - Validated for Intel Pentium 4 PROCHOT timing and thermal throttling correlation. |
| Fan Drive Resolution | 8-bit DAC (0–255 steps) - Provides fine-grained speed control to minimize acoustic noise via enhanced acoustics mode. |
| SMBus Address | Fixed 7-bit 0x4C - Ensures deterministic bus enumeration in multi-device thermal management systems. |
| Series Resistance Cancellation | 0–2 kΩ - Compensates PCB trace resistance in remote diode paths, preserving measurement integrity without external calibration. |
| REFOUT Voltage | 2.226–2.288 V @ 10 mA - Supplies stable excitation for thermistor bias networks with <±1.3% variation. |
Pinout & Package
ADT7466ARQZ-REEL is housed in a 16-lead QSOP package (5.3 mm × 10.2 mm, 1.0 mm height) with standard JEDEC MS-012AC footprint and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DRIVE1) | Analog DAC Output | 8-bit PWM-capable output driving Fan 1; 0–2.2 V range, 2 mA source capability. |
| 2 (TACH1) | Digital Input | 3-wire fan tachometer pulse input; edge-triggered counting for RPM calculation. |
| 3 (DRIVE2) | Analog DAC Output | Independent 8-bit DAC for Fan 2 speed control; identical specs to DRIVE1. |
| 4 (TACH2) | Digital Input | Second tachometer input supporting concurrent dual-fan speed monitoring. |
| 5 (GND) | Ground Reference | Common analog/digital return path; critical for ADC and thermal sensor accuracy. |
| 6 (VCC) | Power Supply | 3.3 V or 5 V main supply; also monitored internally for brown-out detection. |
| 7 (FAN1_ON/PROCHOT/THERM) | Configurable I/O | Three-mode pin: open-drain FAN1 enable, PROCHOT event input, or THERM interrupt output. |
| 8 (FANLOCK) | Digital Output | Open-drain stall/failure flag asserted low when either fan fails to spin up or stalls. |
| 9 (D1−), 10 (D1+) | Analog Inputs | Dedicated cathode/anode connections for first remote thermal diode (e.g., CPU diode). |
| 11 (AIN1/TH1/D2−), 12 (AIN2/TH2/D2+) | Reconfigurable Inputs | Support thermistor voltage division or second remote diode sensing; default = thermistor mode. |
| 13 (REFOUT) | Analog Output | 2.25 V reference (±1.3%) with 10 mA drive; used to bias thermistor networks. |
| 14 (ALERT) | Digital Output | Open-drain SMBus alert signal triggered by any out-of-limit condition (temp/voltage/fan). |
| 15 (SDA) | SMBus I/O | Bidirectional serial data line; requires external pull-up resistor per SMBus spec. |
| 16 (SCL) | SMBus Input | Serial clock input; 400 kHz max frequency; open-drain, requires pull-up. |
Key Features
| Feature | Design Value |
|---|---|
| Concurrent multi-sensor monitoring | Simultaneous read of local temp, two remote diodes, two thermistors, and VCC - enables holistic thermal mapping without software polling overhead. |
| Enhanced acoustic fan control | Gradual DAC step changes and minimum-speed optimization reduce audible fan ramping in notebooks and embedded systems. |
| PROCHOT-aware thermal protection | Direct PROCHOT input (pin 7) allows synchronization with Intel processor thermal throttling events for coordinated system-level response. |
| Series resistance cancellation | Hardware compensation for up to 2 kΩ series resistance in diode paths eliminates calibration drift caused by PCB trace resistance. |
| Configurable pin 7 functionality | Single pin supports three distinct system roles (FAN1 enable, PROCHOT monitor, THERM interrupt), reducing board routing complexity. |
Applications
| Intel Pentium 4 Notebook Thermal Management | Dual-Fan Acoustic Optimization |
|---|---|
|
Use Scenario: Real-time thermal coordination between Intel Pentium 4 processor and system cooling in thin-profile notebooks. IC Role / Device Role / Timing Role: Monitors PROCHOT assertion timing via pin 7 while controlling two fans to maintain safe junction temperatures below throttling thresholds. Use Value: Prevents performance collapse by aligning fan response with CPU thermal events, validated against Pentium 4 reference readings (Figure 12). |
Use Scenario: Minimizing user-perceived fan noise during variable workload conditions in portable computing. IC Role / Device Role / Timing Role: Implements enhanced acoustics mode using 8-bit DAC step-size control and gradual speed transitions across DRIVE1/DRIVE2 outputs. Use Value: Reduces audible fan ramping by limiting DAC update rate and enforcing minimum operational speeds per thermal zone. |
| Multi-Sensor Server Board Monitoring | Thermistor-Based Industrial Enclosure Control |
|
Use Scenario: Consolidating thermal and voltage supervision across CPU, GPU, VRM, and chassis zones in compact server motherboards. IC Role / Device Role / Timing Role: Measures local ambient, two remote diodes (CPU/GPU), two thermistors (VRM/chassis), and VCC in one 68–91 ms cycle. Use Value: Eliminates need for multiple discrete sensors and controllers, reducing BOM count and firmware complexity. |
Use Scenario: Precision temperature regulation in sealed industrial enclosures where airflow is constrained and diode placement is impractical. IC Role / Device Role / Timing Role: Uses REFOUT-biased thermistor networks on pins 11/12 with ±2°C accuracy over 30–100°C range. Use Value: Delivers cost-effective, layout-flexible thermal sensing without requiring semiconductor junctions or PCB thermal vias. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thermal monitoring and dual-fan control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADT7467ARQZ-REEL | Includes internal 2.5 V reference (vs. ADT7466's 2.25 V); identical pinout, register map, and SMBus interface. | Preferred where thermistor bias requires tighter reference stability or compatibility with 2.5 V ADC reference domains. | Select ADT7467ARQZ-REEL only if 2.5 V REFOUT is required; otherwise ADT7466ARQZ-REEL offers optimal cost/performance for 2.25 V–based designs. |
| NCT7802Y | Single-fan controller (1 DAC), no PROCHOT input, no series resistance cancellation, different SMBus address (0x2D). | Limited to simpler thermal systems without Intel processor integration or dual-zone cooling requirements. | Choose NCT7802Y only for cost-sensitive single-fan applications lacking PROCHOT dependency or remote diode compensation needs. |
Compared with ADT7466ARQZ-REEL, ADT7467ARQZ-REEL provides a higher-reference alternative with identical functionality, while NCT7802Y sacrifices dual-fan control, PROCHOT awareness, and series resistance cancellation to reduce channel count and cost - making ADT7466ARQZ-REEL the only option supporting full Intel-coordinated dual-fan thermal management with diode compensation.
Availability
ADT7466ARQZ-REEL is available at Aetrix Electronics and suitable for notebook PC thermal subsystems, Intel platform reference designs, and dual-fan industrial enclosure cooling requiring stable component supply and long-term lifecycle continuity.
Supply support for ADT7466ARQZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets since 1965.
The ADT7466ARQZ-REEL belongs to Analog Devices' dBCool® family of thermal management ICs, engineered specifically for acoustic-noise-sensitive computing platforms requiring coordinated fan control, multi-source temperature monitoring, and Intel processor thermal interface compliance.
FAQ
What is the SMBus address of the ADT7466ARQZ-REEL?
The ADT7466ARQZ-REEL has a fixed 7-bit SMBus address of 0x4C (hex), corresponding to write address 0x98 and read address 0x99. This address is hardwired and not programmable, ensuring deterministic bus arbitration in multi-device thermal management systems. The device supports packet error checking (PEC) and SMBus timeout disable via Configuration Register 1 bit 5.
Can the ADT7466ARQZ-REEL monitor both thermistors and remote diodes simultaneously?
Yes, the ADT7466ARQZ-REEL supports concurrent monitoring of two thermistors (on pins 11/12), two remote diodes (D1+/D1− and D2+/D2−), its internal temperature sensor, and VCC supply voltage within a single 68–91 ms measurement cycle. Pins 11 and 12 are reconfigurable between thermistor and second-diode modes via register settings, enabling flexible sensor deployment without hardware changes.
How does the ADT7466ARQZ-REEL handle series resistance in remote diode traces?
The ADT7466ARQZ-REEL implements hardware-based series resistance cancellation for both D1 and D2 diode paths, compensating for up to 2 kΩ of trace resistance without external components or calibration. This feature maintains ±1°C remote diode accuracy across temperature ranges by dynamically adjusting current sources during delta-VBE measurement, eliminating drift caused by PCB copper resistance.
What functions are supported by pin 7 (FAN1_ON/PROCHOT/THERM) on the ADT7466ARQZ-REEL?
Pin 7 on the ADT7466ARQZ-REEL is a multifunction I/O configurable via register settings: as FAN1_ON (open-drain enable for DC-DC fan driver), PROCHOT input (to time Intel Pentium 4 thermal throttling assertions), or THERM output (active-low interrupt for critical thermal events). Mode selection is controlled by Configuration Register bits, allowing dynamic reassignment based on system architecture requirements.
Does the ADT7466ARQZ-REEL support automatic fan speed control without host intervention?
Yes, the ADT7466ARQZ-REEL implements fully autonomous automatic fan speed control (AFC) using internal registers (TMIN, TRANGE, Enhance Acoustics) to define temperature-to-DAC transfer functions. Once configured, it continuously adjusts DRIVE1 and DRIVE2 outputs based on real-time sensor inputs - maintaining target temperatures while minimizing acoustic noise - without CPU polling or firmware loops.
ADT7466ARQZ-REEL 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 ~ 125°C, External Sensor
- Accuracy:
- ±3°C Local(Max), ±5°C Remote(Max)
- 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 ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
ADT7466ARQZ-REEL FAQ
1.How can I place an order for ADT7466ARQZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADT7466ARQZ-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 ADT7466ARQZ-REEL reliable?
The price and inventory of ADT7466ARQZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADT7466ARQZ-REEL is usually 5 days.
3.What payment methods are accepted for ADT7466ARQZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADT7466ARQZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADT7466ARQZ-REEL?
ADT7466ARQZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADT7466ARQZ-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 ADT7466ARQZ-REEL?
For technical support, including ADT7466ARQZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADT7466ARQZ-REEL requirements.
6.How does Aetrix verify that ADT7466ARQZ-REEL is sourced from the original manufacturer or authorized distributors?
All ADT7466ARQZ-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 ADT7466ARQZ-REEL meets industry standards.
7.What is the process for return or replacement of ADT7466ARQZ-REEL?
All ADT7466ARQZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADT7466ARQZ-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 ADT7466ARQZ-REEL part is unused and in its original packaging.
Return procedure for ADT7466ARQZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADT7466ARQZ-REEL Tags
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