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Analog Devices Inc. ADT7468ARQZ-REEL
- Part No.:
- ADT7468ARQZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Thermal Management
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ADT7468ARQZ-REEL.pdf
- Description:
- ANALOG CIRCUIT, 1 FUNC, PDSO24
- Quantity:
- Payment:
- Shipping:
Inventory:12,475
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Product details
Overview
ADT7468ARQZ-REEL from Analog Devices is a dBCool® remote thermal controller and voltage monitor IC designed for active cooling management in noise-sensitive computing systems. It monitors up to five voltages (including +12 V, +5 V, +2.5 V, VCCP, and VCC), controls four PWM fans with selectable high/low-frequency drive (22.5 kHz or 10–100 Hz), and integrates one on-chip and two remote temperature sensors with series resistance cancellation-enabling precise thermal monitoring up to 191°C in Intel Pentium 4–based server and desktop platforms.
For engineers reviewing the ADT7468ARQZ-REEL datasheet, ADT7468ARQZ-REEL pinout, ADT7468ARQZ-REEL application, or ADT7468ARQZ-REEL equivalent, key selection considerations include SMBus 2.0 compliance, bidirectional THERM interface for PROCHOT monitoring and overtemperature protection, dynamic TMIN control for acoustic optimization, and fail-safe full-speed fan activation at 100°C or after 4.6 s if unaddressed post-VCCP power-up.
Technical Context
The ADT7468ARQZ-REEL implements a 10-bit ADC with ±1.5°C local sensor accuracy (0°C to 70°C) and ±1.5°C remote diode accuracy (0°C to 120°C), supporting series resistance cancellation on both remote channels. Its automatic fan speed control loop uses programmable TRANGE, TTHERM, THYST, and PWMMIN/PWMMAX registers to dynamically adjust PWM duty cycle per temperature channel.
It features dual-mode PWM outputs (PWM1–PWM3), configurable tachometer inputs (TACH1–TACH4) supporting 2-/3-/4-wire fan measurement, and a reconfigurable Pin 14 offering TACH4, THERM, SMBALERT, or GPIO functionality via Configuration Register 4. The device operates from 3.0 V to 5.5 V, draws 3 mA active current, and enters 20 μA standby mode when idle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0 V to 5.5 V - supports both 3.3 V standby and 5 V main rail operation with rescalable attenuators |
| Local Temp Accuracy | ±1.5°C (0°C to 70°C) - enables reliable board-level thermal margining without calibration |
| Remote Temp Range | −64°C to +191°C - extends beyond ADT7463's −127°C to +127°C for high-temp CPU/GPU monitoring |
| Fan Control Outputs | 3 PWM outputs (PWM1–PWM3) - drives up to 4 fans (PWM3 controls Fan 3 & Fan 4 simultaneously) |
| SMBus Address | Fixed 7-bit address 0x2E - eliminates address conflict risk in multi-device thermal management systems |
| THERM Function | Bidirectional - monitors PROCHOT input from Intel CPUs and asserts overtemperature output to throttle system |
| Fail-Safe Activation | Triggers at 100°C or 4.6 s after VCCP power-up - ensures cooling even if SMBus communication fails |
Pinout & Package
ADT7468ARQZ-REEL is housed in a 24-lead QSOP package (5.3 mm × 7.6 mm, 0.635 mm pitch) with exposed pad for thermal dissipation. Pin functions are validated per Analog Devices Rev. A datasheet Figure 3 and Table 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SDA (Pin 1) | SMBus bidirectional data I/O | Open-drain serial bus line requiring external pull-up; supports read/write register access and SMBALERT signaling |
| PWM1 (Pin 24) | Fan 1 speed control output | Open-drain PWM output with 10 kΩ typical pull-up; configurable HF/LF drive for acoustic optimization |
| TACH1–TACH4 (Pins 11,12,9,14) | Fan tachometer inputs | Open-drain digital inputs accepting 0–10,000 RPM pulses; each supports reconfiguration as analog input (AINx) for 2-wire fans |
| D1+/D1−, D2+/D2− (Pins 18,17,16,15) | Remote thermal diode interfaces | Differential connections for two external diode sensors; SRC circuitry cancels PCB trace resistance error |
| THERM (Pin 20 or Pin 14) | Bidirectional thermal alert I/O | Configurable as input (PROCHOT monitoring) or output (overtemperature shutdown signal); threshold set to 2/3 × VCCP |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic TMIN control mode | Intelligently adjusts minimum fan speed based on real-time thermal load to reduce acoustic noise without compromising cooling |
| Enhanced acoustic mode | Smooths PWM ramp rates to minimize perceptible fan speed transitions during thermal transients |
| Series resistance cancellation (SRC) | Compensates for voltage drop across PCB traces between remote diode and sensor, improving remote temp accuracy by up to ±3°C |
| Fail-safe full-speed fan activation | Guarantees immediate cooling if SMBus communication fails or temperature exceeds 100°C - critical for server reliability |
| VCCP monitoring with PROCHOT integration | Measures processor core voltage (0–3 V) and derives THERM threshold at 2/3 × VCCP - aligns with Intel VRM specifications |
Applications
| Server CPU Thermal Management | Desktop Platform Cooling Control |
|---|---|
Use Scenario: Real-time thermal regulation of dual-socket Xeon servers with multiple chassis and CPU fans. IC Role / Device Role / Timing Role: Central thermal controller interfacing with CPU PROCHOT, monitoring VRM output (VCCP), and driving 4 PWM fans via SMBus. Use Value: Enables dynamic fan speed scaling that reduces acoustic noise by >8 dB(A) while maintaining CPU junction <95°C under 100% load. | Use Scenario: Acoustic-optimized cooling for high-end gaming desktops with discrete GPU and multi-core CPU. IC Role / Device Role / Timing Role: Monitors +12 V/+5 V rails, CPU diode (D1+/-), ambient diode (D2+/-), and controls front/rear case fans plus CPU cooler. Use Value: Dynamic TMIN and enhanced acoustic mode eliminate audible fan "stutter" during light-to-heavy workload transitions. |
| Intel Pentium 4 Performance Monitoring | Industrial Embedded Controller Cooling |
Use Scenario: Legacy Pentium 4-based industrial control units requiring PROCHOT-aware thermal protection. IC Role / Device Role / Timing Role: THERM pin configured as input to monitor PROCHOT assertion; triggers immediate fan ramp-up and logs thermal events. Use Value: Prevents CPU throttling-induced control latency by proactively increasing airflow before thermal trip occurs. | Use Scenario: Fan-cooled programmable logic controllers operating in extended temperature environments (−40°C to +85°C). IC Role / Device Role / Timing Role: Measures local die temperature and two remote diodes on heat sinks; maintains fan speed above minimum threshold even at low ambient. Use Value: Extended −64°C to +191°C remote sensing range ensures accurate thermal feedback across full industrial operating envelope. |
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 |
|---|---|---|---|
| ADT7463ARQZ-REEL | Lacks SRC, fixed 10–100 Hz PWM only, −127°C to +127°C temp range, no GPIO on Pin 14 | Lower-cost option where extended range, acoustic enhancement, and PROCHOT integration are not required | Select ADT7463ARQZ-REEL only if legacy register compatibility and reduced feature set suffice for target platform |
| NCT7802Y (Nuvoton) | 8-channel voltage monitor, 3 PWM outputs, no built-in THERM/PROCHOT support, different SMBus register map | Targeted at general-purpose embedded systems rather than Intel-specific thermal management | Choose NCT7802Y when broader voltage monitoring (8 channels) is prioritized over Intel CPU thermal protocol compliance |
Compared with ADT7468ARQZ-REEL, ADT7463ARQZ-REEL offers simpler implementation but lacks acoustic optimization and extended temperature capability, while NCT7802Y provides more voltage inputs but no native PROCHOT handling - making ADT7468ARQZ-REEL uniquely suited for Intel-centric server/desktop thermal design.
Availability
ADT7468ARQZ-REEL is available at Aetrix Electronics and suitable for server thermal management, desktop cooling control, Intel Pentium 4 performance monitoring, and industrial embedded controller cooling requiring stable component supply and long-term lifecycle support.
Supply support for ADT7468ARQZ-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 ADT7468ARQZ-REEL belongs to Analog Devices' dBCool® family of thermal management ICs, engineered specifically for intelligent, low-noise active cooling in x86 computing platforms with integrated PROCHOT and VRM voltage monitoring.
FAQ
What is the primary function of the ADT7468ARQZ-REEL in a computing system?
The ADT7468ARQZ-REEL serves as a dedicated thermal monitor and multi-fan controller, integrating voltage monitoring (five rails), temperature sensing (one on-chip + two remote diodes), and PWM fan control (up to four fans) with SMBus 2.0 interface. Its core function is to maintain safe operating temperatures while minimizing acoustic noise through dynamic TMIN and enhanced acoustic mode - all verified in the ADT7468ARQZ-REEL datasheet Rev. A.
Does the ADT7468ARQZ-REEL support Intel Pentium 4 PROCHOT protocol?
Yes, the ADT7468ARQZ-REEL natively supports Intel Pentium 4 PROCHOT via its bidirectional THERM pin, which can be configured as an input to monitor PROCHOT assertions or as an output to signal overtemperature conditions. The THERM threshold is programmable at 2/3 × VCCP, matching Intel VRM specifications - a capability confirmed in the ADT7468ARQZ-REEL functional description and comparison table against ADT7463.
How does the ADT7468ARQZ-REEL handle remote temperature sensor inaccuracies caused by PCB trace resistance?
The ADT7468ARQZ-REEL implements series resistance cancellation (SRC) on both remote diode channels (D1 and D2), automatically compensating for linear offset introduced by PCB trace resistance between the thermal diode and sensor. This feature improves remote temperature accuracy by up to ±3°C - explicitly documented in the ADT7468ARQZ-REEL product description and comparison with ADT7463.
What fail-safe mechanisms does the ADT7468ARQZ-REEL provide if SMBus communication fails?
The ADT7468ARQZ-REEL activates fail-safe cooling in two scenarios: (1) when measured temperature exceeds 100°C (TTHERM limit), and (2) 4.6 seconds after VCCP power-up if no SMBus transaction has occurred. In both cases, all fans run at full speed - a hardware-enforced safety feature detailed in the ADT7468ARQZ-REEL comparison section and recommended implementation guide.
Can the ADT7468ARQZ-REEL measure voltages other than standard power rails?
Yes, the ADT7468ARQZ-REEL monitors five analog voltage inputs: +12 V, +5 V, +2.5 V, VCCP (processor core voltage), and VCC (supply voltage). Additionally, it reads six VID bits (VID0–VID5) from the CPU to reconstruct supply voltage codes - enabling precise VRM compliance verification and dynamic voltage scaling correlation, as specified in the ADT7468ARQZ-REEL voltage measurement section.
ADT7468ARQZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- dBCool®
- Package/Case:
- 24-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:
- ±2°C(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 ~ 120°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QSOP
ADT7468ARQZ-REEL FAQ
1.How can I place an order for ADT7468ARQZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADT7468ARQZ-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 ADT7468ARQZ-REEL reliable?
The price and inventory of ADT7468ARQZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADT7468ARQZ-REEL is usually 5 days.
3.What payment methods are accepted for ADT7468ARQZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADT7468ARQZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADT7468ARQZ-REEL?
ADT7468ARQZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADT7468ARQZ-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 ADT7468ARQZ-REEL?
For technical support, including ADT7468ARQZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADT7468ARQZ-REEL requirements.
6.How does Aetrix verify that ADT7468ARQZ-REEL is sourced from the original manufacturer or authorized distributors?
All ADT7468ARQZ-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 ADT7468ARQZ-REEL meets industry standards.
7.What is the process for return or replacement of ADT7468ARQZ-REEL?
All ADT7468ARQZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADT7468ARQZ-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 ADT7468ARQZ-REEL part is unused and in its original packaging.
Return procedure for ADT7468ARQZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADT7468ARQZ-REEL Tags
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EMC2101-ACZL-TR
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EMC2101-R-ACZL-TR
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