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Analog Devices Inc. ADT7468ARQ
- Part No.:
- ADT7468ARQ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Thermal Management
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADT7468ARQ.pdf
- Description:
- ANALOG CIRCUIT, 1 FUNC, PDSO24
- Quantity:
- Payment:
- Shipping:
Inventory:8,352
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Product details
Overview
ADT7468ARQ from Analog Devices is a dBCool® remote thermal controller and voltage monitor IC designed for active cooling management in noise- and power-sensitive systems. It integrates 1 on-chip + 2 remote temperature sensors, monitors up to 5 voltages (including +12V, +5V, +2.5V, VCCP, and VCC), controls 3 PWM fan outputs with configurable high/low-frequency drive (22.5 kHz or 10–100 Hz), and supports SMBus 2.0 for system-level thermal supervision in Intel Pentium 4–based platforms.
For engineers reviewing the ADT7468ARQ datasheet, ADT7468ARQ pinout, ADT7468ARQ application, or ADT7468ARQ equivalent, key selection considerations include its dual-diode remote sensing with series resistance cancellation, dynamic TMIN control mode for acoustic optimization, fail-safe full-speed fan activation at 100°C THERM limit, and support for VRM10-compliant VID5 monitoring - all in a 24-lead QSOP package.
Technical Context
The ADT7468ARQ implements a 10-bit ADC with multiplexed analog inputs for simultaneous voltage and temperature digitization, featuring ±1.5°C local sensor accuracy (0°C to 70°C) and ±1.5°C remote diode accuracy (0°C to 120°C), plus programmable offset compensation (±64°C, 0.5°C resolution). Its automatic fan speed control loop uses real-time temperature feedback from up to three independent thermal channels to dynamically adjust PWM duty cycles.
It features bidirectional THERM functionality - configurable as input to monitor PROCHOT from Intel Pentium 4 processors or as output to assert overtemperature shutdown - and includes dedicated VID[0:5] digital inputs for CPU core voltage identification. The device supports SMBus 2.0 timing (up to 400 kHz), includes SMBALERT interrupt capability, and enables fail-safe cooling activation within 4.6 seconds of VCCP power-up if no SMBus communication occurs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Sensing | 1 on-chip + 2 remote diode sensors; −64°C to +191°C extended range with series resistance cancellation (SRC) |
| Voltage Monitoring | 5 analog inputs: +12VIN, +5VIN, +2.5VIN, VCCP (0–3 V), VCC; ±2% total unadjusted error on 12 V/5 V channels |
| Fan Control | 3 PWM outputs (PWM1–PWM3); configurable HF (22.5 kHz) or LF (10–100 Hz); programmable PWMMIN/PWMMAX per channel |
| Fan Speed Measurement | 4 tachometer inputs (TACH1–TACH4); ±5% accuracy (0°C–70°C); supports 2-/3-/4-wire fans |
| Serial Interface | SMBus 2.0 compliant; fixed 7-bit address 0x2E; supports SMBALERT interrupt and bidirectional THERM signaling |
| Power Supply | 3.0 V to 5.5 V operation; 3 mA typical supply current (ADC active); 20 μA standby current |
| Package | 24-lead QSOP; θJA = 150°C/W; RoHS-compliant, Pb-free reflow peak 260°C |
Pinout & Package
ADT7468ARQ is housed in a 24-lead QSOP (Quad Small Outline Package) with 0.635 mm lead pitch, optimized for compact motherboard thermal management layouts and compatible with standard surface-mount assembly processes.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SDA) | SMBus Serial Data I/O | Open-drain bidirectional data line; requires external pull-up; supports read/write register access and SMBALERT signaling |
| 2 (SCL) | SMBus Serial Clock Input | Open-drain clock input; synchronizes all SMBus transactions; 10–400 kHz compliant |
| 4 (VCC) | Main Power Supply | 3.0–5.5 V supply input; also monitored as voltage channel; supports 3.3 V standby operation |
| 13 (PWM3) | Fan Control Output | Open-drain PWM output controlling Fan 3 or Fan 4 (shared); configurable HF/LF drive; 10 kΩ pull-up required |
| 14 (TACH4/GPIO/THERM/SMBALERT) | Multi-function Terminal | Selectable via Config Register 4: tachometer input, GPIO (programmable I/O), bidirectional THERM, or SMBALERT interrupt |
| 17–18, 15–16 (D1±, D2±) | Remote Thermal Diode Interfaces | Differential connections for two external thermal diodes; enable SRC to cancel PCB trace resistance effects |
| 20 (+5VIN/THERM) | Analog Input / THERM Reconfigurable Pin | Monitors +5 V rail; alternatively reconfigured as THERM input/output for PROCHOT or overtemperature signaling |
| 23 (VCCP) | Processor Core Voltage Monitor | Analog input for 0–3 V CPU core supply; used to set dynamic THERM threshold (2/3 × VCCP) |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic TMIN Control Mode | Intelligently adjusts minimum fan speed based on thermal load to reduce acoustic noise without compromising cooling margin |
| Enhanced Acoustic Mode | Smooths PWM ramp rates to minimize perceptible fan speed transitions, improving user experience in desktop/server environments |
| Series Resistance Cancellation (SRC) | Automatically compensates for linear offset introduced by PCB trace resistance between remote diode and sensor pins |
| Bidirectional THERM Pin | Functions as input to monitor Intel PROCHOT or as output to signal system overtemperature; enables hardware-level thermal protection |
| Fail-Safe Full-Speed Activation | Fans drive at 100% duty cycle if THERM limit (100°C) is exceeded or if no SMBus command received within 4.6 sec of VCCP power-up |
| VRM10-Compatible VID Monitoring | VID[0:5] inputs (Pins 5–9, 21) support 6-bit voltage identification for modern CPU power delivery controllers |
Applications
| Desktop PC Thermal Management | Server Blade Cooling Control |
|---|---|
Use Scenario: Real-time thermal supervision of CPU, chipset, and chassis ambient in high-density desktop platforms with dual-fan cooling. IC Role / Device Role / Timing Role: Central thermal controller coordinating fan speeds, voltage health, and PROCHOT response via SMBus; interfaces directly with Intel Pentium 4 processor THERM line. Use Value: Enables silent operation below thermal thresholds while guaranteeing fail-safe full-speed cooling above 100°C - critical for sustained compute workloads. |
Use Scenario: Multi-zone thermal regulation across CPU, memory, and I/O modules in 1U/2U server blades with constrained airflow. IC Role / Device Role / Timing Role: Monitors up to 5 voltages and 3 temperature zones (CPU die, VRM, ambient), driving 3 PWM fans with dynamic TMIN to balance power vs. acoustics. Use Value: Reduces system fan power consumption by up to 40% during light loads while maintaining <±1.5°C remote sensing accuracy for reliable thermal margining. |
| Industrial Embedded Controller Cooling | Workstation GPU/ASIC Thermal Protection |
Use Scenario: Fan-cooled industrial PLC or edge AI gateway operating continuously at 60°C ambient with extended temperature requirements. IC Role / Device Role / Timing Role: Provides extended-range temperature measurement (−64°C to +191°C) and robust 3.3 V/5 V supply monitoring under wide-temp conditions. Use Value: Eliminates need for external calibration or discrete thermal protection circuits - SRC ensures accuracy despite PCB copper resistance drift over time. |
Use Scenario: Thermal guard for high-power GPU or FPGA acceleration cards where localized hotspots require precise diode-based sensing. IC Role / Device Role / Timing Role: Uses two remote diode channels (D1+, D1−, D2+, D2−) to track GPU die and VRM junction temperatures independently. Use Value: Delivers ±1.5°C remote accuracy at 120°C, enabling aggressive thermal throttling only when necessary - preserving performance headroom. |
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 |
|---|---|---|---|
| ADT7463ARQ | Limited to low-frequency PWM only (10–100 Hz); no series resistance cancellation; −127°C to +127°C temp range; fixed 100% PWMMAX; no GPIO on Pin 14 | Lower-cost option for legacy designs without VRM10 or enhanced acoustic requirements; lacks fail-safe 4.6-sec activation | Select ADT7463ARQ only if extended temperature range, SRC, or HF PWM are unnecessary and SMBus address flexibility (3 options vs. fixed 0x2E) is required. |
| LM96163CIMT | TI part with 2 remote diodes, 5 voltage inputs, 3 PWM outputs; ±1°C remote accuracy; 32-pin TSSOP; no VID monitoring; different register map and SMBus interface behavior | Designed for AMD platform compatibility; lacks THERM bidirectionality and dynamic TMIN mode; no VRM10 VID5 support | Choose LM96163CIMT for AMD-based systems requiring tighter remote accuracy but willing to forgo Intel PROCHOT integration and VRM10 compliance. |
Compared with ADT7463ARQ and LM96163CIMT, the ADT7468ARQ uniquely combines VRM10 VID5 support, bidirectional THERM for Intel PROCHOT, series resistance cancellation, and dynamic TMIN - making it the only option qualified for next-generation Pentium 4–derived thermal architectures requiring both precision and fail-safe reliability.
Availability
ADT7468ARQ is available at Aetrix Electronics and suitable for desktop PC thermal management, server blade cooling control, industrial embedded controller cooling, and workstation GPU/ASIC thermal protection requiring stable component supply and long-term lifecycle support.
Supply support for ADT7468ARQ 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, with design and manufacturing facilities worldwide.
The ADT7468ARQ belongs to Analog Devices' dBCool® family of thermal management ICs, engineered specifically for intelligent, low-noise active cooling in x86-based computing platforms - emphasizing acoustic optimization, fail-safe protection, and seamless integration with Intel thermal control architecture.
FAQ
What is the SMBus address of the ADT7468ARQ?
The ADT7468ARQ has a fixed 7-bit SMBus address of 0x2E (0101110 binary), resulting in an 8-bit write address of 0x5C and read address of 0x5D. Unlike earlier variants such as the ADT7463, it does not support address select pins - simplifying system integration but requiring address conflict avoidance in multi-device SMBus networks. This fixed addressing is documented in the ADT7468 Rev. A datasheet Section "Serial Bus Interface".
Does the ADT7468ARQ support Intel Pentium 4 PROCHOT monitoring?
Yes, the ADT7468ARQ supports Intel Pentium 4 PROCHOT monitoring via its bidirectional THERM pin (Pin 20 or Pin 14, configurable). When configured as input, it times and monitors PROCHOT assertions from the CPU; when configured as output, it drives THERM to signal system overtemperature. This dual-mode capability is explicitly validated in the ADT7468 datasheet's "General Description" and "Recommended Implementation" sections.
How does series resistance cancellation (SRC) work on the ADT7468ARQ?
The ADT7468ARQ implements series resistance cancellation (SRC) on both remote diode channels (D1± and D2±) by applying a calibrated current source sequence (6 μA, 36 μA, 96 μA) and digitally subtracting the linear offset caused by PCB trace resistance. This eliminates manual calibration and maintains ±1.5°C accuracy even with up to several hundred ohms of series resistance - a feature absent in the ADT7463 and confirmed in the ADT7468 "Features" and "Temperature Measurement" sections.
What is the maximum measurable temperature range of the ADT7468ARQ?
The ADT7468ARQ supports an extended temperature measurement range of −64°C to +191°C for both local and remote sensors. This exceeds the −127°C to +127°C range of the ADT7463 and is enabled by default (Bit 0 of Configuration Register 5 = 1). The extended range is verified in Table 1 ("SPECIFICATIONS") and Section "Comparison between ADT7463 and ADT7468" of the ADT7468 Rev. A datasheet.
Can the ADT7468ARQ control more than three fans?
Yes - the ADT7468ARQ can control up to four fans using its three PWM outputs: PWM1 drives Fan 1, PWM2 drives Fan 2, and PWM3 can be wired to drive Fans 3 and 4 in parallel. This configuration is demonstrated in Figure 15 ("ADT7468 Configuration") of the datasheet and supported by the device's fan speed measurement capability on TACH1–TACH4. Independent speed control is limited to three fans; fourth fan shares PWM3 duty cycle.
ADT7468ARQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- dBCool®
- Package/Case:
- 24-TSSOP (0.173", 4.40mm 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-TSSOP
ADT7468ARQ FAQ
1.How can I place an order for ADT7468ARQ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADT7468ARQ 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 ADT7468ARQ reliable?
The price and inventory of ADT7468ARQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADT7468ARQ is usually 5 days.
3.What payment methods are accepted for ADT7468ARQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADT7468ARQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADT7468ARQ?
ADT7468ARQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADT7468ARQ 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 ADT7468ARQ?
For technical support, including ADT7468ARQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADT7468ARQ requirements.
6.How does Aetrix verify that ADT7468ARQ is sourced from the original manufacturer or authorized distributors?
All ADT7468ARQ 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 ADT7468ARQ meets industry standards.
7.What is the process for return or replacement of ADT7468ARQ?
All ADT7468ARQ units undergo pre-shipment inspection (PSI). If there is an issue with ADT7468ARQ, 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 ADT7468ARQ part is unused and in its original packaging.
Return procedure for ADT7468ARQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADT7468ARQ 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
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SE98ATP,547
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AMC6821SDBQR
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MAX6604AATA+T
Analog Devices Inc./Maxim Integrated
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ADT7475ARQZ-REEL
onsemi
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MAX6643LBBAEE+
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MAX6684ESA+T
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