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Analog Devices Inc. ADT7468ARQ-REEL7
- Part No.:
- ADT7468ARQ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Thermal Management
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADT7468ARQ-REEL7.pdf
- Description:
- ANALOG CIRCUIT, 1 FUNC, PDSO24
- Quantity:
- Payment:
- Shipping:
Inventory:9,988
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Product details
Overview
ADT7468ARQ-REEL7 from Analog Devices is a dBCool® remote thermal controller and voltage monitor IC designed for active cooling management in noise-sensitive computing 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 interface for system-level thermal supervision in Intel Pentium 4–based platforms.
For engineers reviewing the ADT7468ARQ-REEL7 datasheet, ADT7468ARQ-REEL7 pinout, ADT7468ARQ-REEL7 application, or ADT7468ARQ-REEL7 equivalent, key selection criteria include its dynamic TMIN control mode for acoustic optimization, series resistance cancellation (SRC) on remote diode channels, bidirectional THERM pin for PROCHOT monitoring and overtemperature protection, and fail-safe full-speed fan activation at 100°C or after 4.6 s if unaddressed post-VCCP power-up.
Technical Context
The ADT7468ARQ-REEL7 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), plus 0.25°C resolution for both. Its analog multiplexer routes up to five voltage inputs (+12VIN, +5VIN, +2.5VIN, VCCP, VCC) and two remote diode pairs (D1+/D1−, D2+/D2−) to the converter, with dedicated attenuators and input resistances of 40–200 kΩ depending on channel.
It features three open-drain PWM outputs (PWM1–PWM3) supporting programmable duty cycle and frequency mode, four tachometer inputs (TACH1–TACH4) with ±5% RPM accuracy (0°C to 70°C), and dual-function pins including THERM/SMBALERT/GPIO on Pin 14 and THERM/+5VIN on Pin 20 - all managed via SMBus-configurable registers including Configuration Register 5 (0x7C) for extended functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Sensing | 1 on-chip + 2 remote diode sensors; −64°C to +191°C extended range enables high-temp CPU/chipset monitoring |
| Voltage Monitoring | 5 channels: +12VIN, +5VIN, +2.5VIN, VCCP (0–3 V), VCC; ±2% total unadjusted error ensures accurate rail health assessment |
| Fan Control | 3 PWM outputs (PWM1–PWM3); HF (22.5 kHz) or LF (10–100 Hz) mode selectable per output to reduce audible noise or EMI |
| Fan Speed Measurement | 4 tachometer inputs (TACH1–TACH4); ±5% accuracy at 3.3 V/0°C–70°C supports reliable closed-loop speed feedback |
| Interface | SMBus 2.0 compliant (fixed address 0x2E); supports write/read operations, interrupt signaling via SMBALERT, and timeout detection (15–35 ms) |
| Thermal Protection | Bidirectional THERM pin (Pins 14 & 20); functions as input for PROCHOT assertion or output for overtemperature shutdown at 100°C |
| Power Supply | 3.0–5.5 V operation; 3 mA active current, 20 μA standby current enables low-power thermal supervision during system sleep states |
Pinout & Package
ADT7468ARQ-REEL7 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 fully defined in Analog Devices Rev. A datasheet Figure 3 and Table 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (SDA) | SMBus bidirectional serial data I/O | Open-drain interface requiring external pull-up; enables register read/write and interrupt reporting via SMBALERT reconfiguration |
| Pin 4 (VCC) | Main power supply input | Accepts 3.0–5.5 V; also monitored as voltage channel; Bit 7 of Config Reg 1 rescales attenuators for 5 V operation |
| Pins 17–18, 15–16 (D1±, D2±) | Remote thermal diode interfaces | Support series resistance cancellation (SRC); enable accurate CPU/die temperature sensing with PCB trace compensation |
| Pins 11–12, 9, 14 (TACH1–TACH4) | Fan tachometer inputs | Open-drain inputs accepting 2-/3-/4-wire fan signals; TACH4 shares pin with THERM/SMBALERT/GPIO via Config Reg 4 |
| Pins 24, 10, 13 (PWM1, PWM2, PWM3) | PWM fan drive outputs | Open-drain outputs requiring 10 kΩ pull-up; each configurable for HF (22.5 kHz) or LF (10–100 Hz) drive to balance noise vs. efficiency |
| Pins 14 & 20 (THERM) | Bidirectional thermal alert I/O | Configurable as input (e.g., Intel PROCHOT) or output (overtemperature signal); triggers fail-safe full-speed fan at 100°C |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic TMIN control mode | Intelligently adjusts minimum fan speed threshold based on real-time thermal load to minimize acoustic noise without compromising cooling margin |
| Series resistance cancellation (SRC) | Automatically compensates for linear offset caused by PCB trace resistance between remote diode and sensor, improving diode temp accuracy by up to ±3°C |
| Enhanced acoustic mode | Smooths PWM ramp rates to reduce perceptible fan speed transitions - critical for desktops, workstations, and quiet server environments |
| Fail-safe thermal protection | Activates full-speed fan operation 4.6 seconds after VCCP power-up if no SMBus communication occurs, preventing thermal runaway during boot or bus failure |
| VID voltage monitoring | 6-bit VID inputs (VID0–VID5) capture CPU core voltage codes for real-time VCCP tracking and PROCHOT threshold derivation (2/3 × VCCP) |
Applications
| Intel Pentium 4 Desktop Platform | Server Chassis Thermal Management |
|---|---|
|
Use Scenario: Real-time monitoring of CPU die temperature (via remote diode), VCCP, +12V PSU rail, and front/rear chassis fans in a Pentium 4–based ATX motherboard. IC Role / Device Role / Timing Role: Central thermal supervisor coordinating fan speed via PWM1–PWM3 while interpreting PROCHOT assertions on THERM pin to throttle cooling dynamically. Use Value: Enables silent operation under light load via dynamic TMIN and prevents thermal throttling-induced performance loss through precise 0.25°C-resolution temperature feedback. |
Use Scenario: Multi-fan cooling control across redundant power supplies, CPU heatsinks, and chipset VRMs in a 1U rack-mount server with strict acoustic limits. IC Role / Device Role / Timing Role: Voltage and temperature hub aggregating +12VIN, +5VIN, +2.5VIN, VCCP, and two remote diodes (CPU + chipset), driving three independent PWM-controlled fans with fail-safe override. Use Value: Guarantees system uptime via automatic full-speed fan activation at 100°C and SMBus timeout recovery - eliminating need for external watchdog circuitry. |
| Embedded Industrial Controller | High-Density Compute Appliance |
|
Use Scenario: Thermal supervision of ARM/x86 SoC, DDR memory regulator (+2.5VIN), and FPGA junction temperature in an industrial PLC with extended temperature requirements. IC Role / Device Role / Timing Role: Remote diode sensor interface (D1+/D1−) with SRC for accurate SoC die temp measurement; monitors VCCP-equivalent core rail and provides GPIO-capable Pin 14 for status signaling. Use Value: Supports −40°C to +120°C ambient operation with ±2°C remote sensor accuracy and 20 μA standby current for low-power wake-on-thermal events. |
Use Scenario: Active cooling coordination across GPU, CPU, and memory modules in a GPU-accelerated edge AI appliance with tightly packed thermal zones. IC Role / Device Role / Timing Role: Simultaneous monitoring of four voltage rails (+12V, +5V, +2.5V, VCCP) and two remote diodes (GPU + CPU), using PWM3 to drive dual-fan stacks in parallel. Use Value: Reduces board area and BOM count by consolidating five voltage monitors, three PWM controllers, and three temperature sensors into one 24-QSOP IC. |
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-REEL7 | Lacks series resistance cancellation (SRC), fixed low-frequency PWM only (no 22.5 kHz option), −127°C to +127°C temp range, no GPIO on Pin 14, and no dynamic TMIN mode | Lower-cost option for legacy Pentium 4 designs where acoustic optimization and extended temperature range are not required | Select ADT7463ARQZ-REEL7 only when backward compatibility with existing ADT7463 register maps and simpler thermal profiles suffice |
| LM95235CIMMX/NOPB | 2-channel remote diode sensing only (no on-chip sensor), no VID monitoring, single PWM output, SMBus address selectable (not fixed), no THERM bidirectional capability | Suitable for cost-constrained embedded systems needing basic dual-diode thermal monitoring without fan control integration | Choose LM95235CIMMX/NOPB when fan control is handled externally and only two remote temperature zones require monitoring |
Compared with ADT7468ARQ-REEL7, ADT7463ARQZ-REEL7 offers reduced feature set but identical pinout and basic register compatibility, while LM95235CIMMX/NOPB provides lower integration but greater flexibility in SMBus addressing - neither supports the ADT7468ARQ-REEL7's acoustic enhancement, SRC, or fail-safe thermal protection architecture.
Availability
ADT7468ARQ-REEL7 is available at Aetrix Electronics and suitable for Intel Pentium 4 platform design-in, server chassis thermal management, and embedded industrial controller development requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for ADT7468ARQ-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, with design centers and manufacturing facilities worldwide.
The ADT7468ARQ-REEL7 belongs to Analog Devices' dBCool® family of thermal management ICs, engineered specifically for noise-sensitive computing platforms requiring integrated voltage monitoring, multi-fan PWM control, and intelligent thermal protection - especially in Intel-based desktops, servers, and embedded systems.
FAQ
What is the operating temperature range of the ADT7468ARQ-REEL7?
The ADT7468ARQ-REEL7 operates from −40°C to +120°C ambient temperature. Its internal temperature sensor achieves ±1.5°C accuracy from 0°C to 70°C, and its remote diode channels support measurements from −64°C to +191°C - enabled by setting Bit 0 of Configuration Register 5 (0x7C) to select the extended range. This makes ADT7468ARQ-REEL7 suitable for high-thermal-load CPU and GPU monitoring applications where legacy sensors fall short.
Does the ADT7468ARQ-REEL7 support both high- and low-frequency PWM fan drive?
Yes, the ADT7468ARQ-REEL7 supports programmable PWM frequency per output: high-frequency mode at 22.5 kHz (default, set by Bit 1 = 0 in Configuration Register 5) minimizes audible noise and EMI, while low-frequency mode (10–100 Hz, activated by Bit 1 = 1) is compatible with legacy fan drivers. This dual-mode capability is unique to ADT7468ARQ-REEL7 and not available on the earlier ADT7463ARQZ-REEL7.
How does the series resistance cancellation (SRC) feature work on the ADT7468ARQ-REEL7?
The ADT7468ARQ-REEL7 implements hardware-based series resistance cancellation on both remote diode channels (D1± and D2±) by applying three distinct bias currents (6 μA, 36 μA, 96 μA) and calculating offset correction in real time. This eliminates measurement errors introduced by PCB trace resistance - improving remote temperature accuracy by up to ±3°C - and is confirmed in the ADT7468 Rev. A datasheet Section "Comparison between ADT7463 and ADT7468" and Figure 6.
Can the ADT7468ARQ-REEL7 monitor Intel Pentium 4 PROCHOT signals?
Yes, the ADT7468ARQ-REEL7 can monitor Intel Pentium 4 PROCHOT signals via its bidirectional THERM pin (Pins 14 and 20). When configured as an input, it times and detects PROCHOT assertions; when configured as an output, it asserts THERM to signal overtemperature conditions. The threshold is derived from VCCP (2/3 × VCCP), unlike the fixed VIH/VIL thresholds used in ADT7463ARQZ-REEL7.
What is the SMBus address of the ADT7468ARQ-REEL7?
The ADT7468ARQ-REEL7 has a fixed 7-bit SMBus address of 0x2E (0101110 binary), with full 8-bit read address 0x5C and write address 0x5D. Unlike the ADT7463ARQZ-REEL7, which supports three selectable addresses via hardware pins, the ADT7468ARQ-REEL7 uses a single hardwired address - simplifying system integration but requiring careful bus arbitration in multi-device configurations.
ADT7468ARQ-REEL7 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-REEL7 FAQ
1.How can I place an order for ADT7468ARQ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADT7468ARQ-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 ADT7468ARQ-REEL7 reliable?
The price and inventory of ADT7468ARQ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADT7468ARQ-REEL7 is usually 5 days.
3.What payment methods are accepted for ADT7468ARQ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADT7468ARQ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADT7468ARQ-REEL7?
ADT7468ARQ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADT7468ARQ-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 ADT7468ARQ-REEL7?
For technical support, including ADT7468ARQ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADT7468ARQ-REEL7 requirements.
6.How does Aetrix verify that ADT7468ARQ-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADT7468ARQ-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 ADT7468ARQ-REEL7 meets industry standards.
7.What is the process for return or replacement of ADT7468ARQ-REEL7?
All ADT7468ARQ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADT7468ARQ-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 ADT7468ARQ-REEL7 part is unused and in its original packaging.
Return procedure for ADT7468ARQ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADT7468ARQ-REEL7 Tags
-
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
-
ADT7475ARQZ-REEL
onsemi
-
MAX6643LBBAEE+
Analog Devices Inc./Maxim Integrated
-
MAX6684ESA+T
Analog Devices Inc./Maxim Integrated
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MAX6639AEE+
Analog Devices Inc./Maxim Integrated
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