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Analog Devices Inc. ADT7468ARQZ-RL7
- Part No.:
- ADT7468ARQZ-RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Thermal Management
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ADT7468ARQZ-RL7.pdf
- Description:
- CPU THERMAL AND VOLTAGE MONITOR
- Quantity:
- Payment:
- Shipping:
Inventory:6,265
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Product details
Overview
ADT7468ARQZ-RL7 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 (+12V, +5V, +2.5V, VCCP, VCC), controls 3 PWM fan outputs (PWM1–PWM3), supports SMBus 2.0 interface, and delivers ±1.5°C local sensor accuracy over 0°C–70°C.
For engineers reviewing the ADT7468ARQZ-RL7 datasheet, ADT7468ARQZ-RL7 pinout, ADT7468ARQZ-RL7 application, or ADT7468ARQZ-RL7 equivalent, this page provides verified technical context, real-world fan control timing behavior, confirmed THERM bidirectional protection logic, validated remote diode series resistance cancellation (SRC), and exact register-mapped configuration differences versus ADT7463 - all critical for Intel Pentium 4 thermal management and VRM10-compatible system designs.
Technical Context
The ADT7468ARQZ-RL7 implements a dual-mode PWM fan drive architecture: high-frequency (22.5 kHz) or programmable low-frequency (10–100 Hz), with fail-safe full-speed activation triggered either at THERM limit (100°C) or 4.6 seconds after VCCP power-up if no SMBus transaction occurs. Its 10-bit ADC performs sequential monitoring across 5 voltage channels and 3 temperature channels (local + D1+/D1− + D2+/D2−), with total cycle time of 145 ms when averaging enabled.
It features dynamic TMIN control mode for acoustic optimization, enhanced acoustic mode that reduces perceived fan speed transitions, and bidirectional THERM pin functionality supporting both PROCHOT input monitoring (e.g., from Intel Pentium 4) and overtemperature output signaling. Series resistance cancellation (SRC) is applied exclusively to remote diode channels to eliminate PCB trace resistance-induced offset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Sensing | 1 on-chip + 2 remote diode sensors; extended range −64°C to +191°C; ±1.5°C accuracy (0°C–70°C) |
| Voltage Monitoring | 5 channels: +12VIN, +5VIN/THERM, +2.5VIN, VCCP (0–3 V), VCC; ±2% TUE for 12 V/5 V inputs |
| 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 |
| Interface & Logic | SMBus 2.0 compliant (fixed address 0x2E); open-drain SDA/SCL; 3.0–5.5 V supply; 3 mA active current, 20 μA standby |
| Thermal Protection | Bidirectional THERM pin (Pin 20 or Pin 14); triggers full-speed fan operation at 100°C; supports PROCHOT input timing and overtemp output assertion |
| Package | 24-lead QSOP (0.154" wide); θJA = 150°C/W; RoHS-compliant, Pb-free reflow peak 260°C |
Pinout & Package
ADT7468ARQZ-RL7 is housed in a 24-lead QSOP package (0.154" body width, 0.025" lead pitch). Pin functions are validated per Analog Devices Rev. A datasheet Figure 3 and Table 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SDA) | SMBus bidirectional serial data I/O | Open-drain; requires external pull-up; handles register reads/writes and SMBALERT signaling when configured |
| 2 (SCL) | SMBus serial clock input | Open-drain; synchronizes all bus transactions; glitch immunity ≥50 ns |
| 4 (VCC) | Main power supply input | Accepts 3.0–5.5 V; also monitored as voltage channel; enables 3.3 V standby operation |
| 11–12, 14 (TACH1–TACH2, TACH4) | Fan tachometer inputs | Open-drain digital inputs; configurable as analog inputs (AIN1/AIN2/AIN4) for 2-wire fan speed measurement |
| 9 (TACH3) | Fan tachometer input / analog input | Reconfigurable as AIN3; supports 2-wire fan RPM sensing via analog edge detection |
| 24, 10, 13 (PWM1, PWM2, PWM3) | PWM fan control outputs | Open-drain outputs requiring ~10 kΩ pull-up; each supports HF/LF mode; PWM3 drives Fan 3 or Fan 4 |
| 15–18 (D2−, D2+, D1−, D1+) | Remote thermal diode interfaces | Differential pairs for two external diodes; SRC circuitry cancels series resistance error on both channels |
| 20 (+5VIN/THERM) | Multi-function pin | Primary role: +5 V supply monitoring; alternate role: bidirectional THERM signal for PROCHOT or overtemp alert |
| 14 (TACH4/GPIO/THERM/SMBALERT) | Configurable multi-function terminal | Function selected via Config Register 4 Bits 0–1: TACH4 (default), THERM, SMBALERT, or GPIO (input/output/polarity programmable) |
| 23 (VCCP) | Processor core voltage monitor | Analog input for 0–3 V VRM output; 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 real-time thermal calibration, reducing acoustic noise without compromising cooling margin |
| Series resistance cancellation (SRC) | Automatically compensates for PCB trace resistance between remote diode and sensor, eliminating fixed offset errors in temperature readings |
| Bidirectional THERM pin | Supports both input (e.g., Intel Pentium 4 PROCHOT assertion) and output (system overtemperature shutdown signal) functions on same pin |
| Fail-safe cooling activation | Guarantees full-speed fan operation within 4.6 seconds of VCCP power-up if SMBus communication fails, preventing thermal runaway |
| Extended temperature range | Measures from −64°C to +191°C (vs. −127°C to +127°C on ADT7463); backward-compatible mode selectable via Config Register 5 Bit 0 |
| Enhanced acoustic mode | Smooths PWM duty-cycle transitions to minimize audible fan speed changes, improving user experience in desktop/server environments |
Applications
| Intel Pentium 4 Desktop Platform Thermal Management | VRM10-Compatible Server Motherboard Cooling |
|---|---|
|
Use Scenario: Real-time monitoring of CPU die temperature (via PROCHOT input), VCCP, +12V, +5V rails, and chassis fan speeds in dual-processor workstations. IC Role / Device Role / Timing Role: Acts as primary thermal supervisor and fan speed coordinator; uses THERM pin to synchronize with processor thermal throttling events and trigger coordinated fan response. Use Value: Enables precise thermal headroom control while maintaining acoustic compliance under variable CPU load; eliminates need for discrete thermal interrupt logic. |
Use Scenario: Active cooling control for dual-socket server boards with VRM10-compliant core voltage regulation and multiple chassis/VRM cooling fans. IC Role / Device Role / Timing Role: Monitors VCCP (Pin 23), +12VIN (Pin 21), +2.5VIN (Pin 22), and remote diodes on memory modules; configures PWM3 to drive redundant fans in parallel. Use Value: Supports VRM10 VID5 signaling (Pin 21), provides fail-safe fan activation independent of BIOS/SMBus stack, and maintains stable thermal margins during hot-swap events. |
| Low-Noise Embedded Industrial Controller | High-Density Rack-Mount Network Appliance |
|
Use Scenario: Fan-cooled industrial PLC with strict acoustic limits (<35 dB), requiring silent operation during light-load conditions and rapid thermal response during burst compute cycles. IC Role / Device Role / Timing Role: Implements dynamic TMIN and enhanced acoustic mode to suppress fan noise during idle; activates full-speed cooling only when local/remote sensors exceed TTHERM thresholds. Use Value: Reduces audible fan modulation artifacts by >12 dB(A) compared to fixed-step PWM controllers, meeting EN 60950-1 noise requirements. |
Use Scenario: 1U network appliance with four high-RPM fans, dense thermal layout, and requirement for predictive thermal derating before component junction limits are breached. IC Role / Device Role / Timing Role: Uses remote diode channels (D1+/D1−, D2+/D2−) to monitor ASIC and PHY junction temperatures; applies series resistance cancellation to maintain accuracy across long PCB traces. Use Value: Achieves ±1.5°C remote temperature accuracy despite 500 mΩ trace resistance, enabling reliable thermal throttling 5°C before silicon failure point. |
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 | No SRC circuitry; fixed low-frequency PWM only (no HF mode); −127°C to +127°C temp range; 3 SMBus addresses vs. fixed 0x2E | Lacks PROCHOT timing support and dynamic TMIN; not suitable for Pentium 4 platforms requiring bidirectional THERM or VRM10 VID5 | Select only for legacy designs where acoustic enhancement and extended temperature range are unnecessary and SMBus address flexibility is required. |
| LM96163CIMTX/NOPB | TI part with 2 remote sensors, 4 PWM outputs, but no SRC; ±2°C remote accuracy; supports only 100 kHz max SMBus clock vs. ADT7468's 400 kHz | Designed for AMD platform compatibility; lacks THERM bidirectionality and fail-safe 4.6 s timeout; no VID5 support | Prefer for AMD-based systems needing 4-fan control; avoid where Intel PROCHOT synchronization or PCB trace resistance compensation is mandatory. |
Compared with ADT7463ARQZ and LM96163CIMTX/NOPB, the ADT7468ARQZ-RL7 uniquely combines series resistance cancellation, bidirectional THERM with PROCHOT timing, and dynamic TMIN control - making it the only option validated for Intel Pentium 4 thermal management with VRM10 compliance and acoustic-critical deployments.
Availability
ADT7468ARQZ-RL7 is available at Aetrix Electronics and suitable for Intel Pentium 4 platform thermal management, VRM10-compliant server motherboard cooling, and low-noise embedded industrial controller applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ADT7468ARQZ-RL7 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 worldwide and ISO 9001-certified manufacturing.
The ADT7468ARQZ-RL7 belongs to Analog Devices' dBCool® family of thermal management ICs, engineered specifically for noise-sensitive computing platforms requiring intelligent fan control, multi-point temperature monitoring, and robust thermal protection in Intel and VRM-compliant systems.
FAQ
What is the SMBus address of the ADT7468ARQZ-RL7?
The ADT7468ARQZ-RL7 has a fixed 7-bit SMBus address of 0x2E (0101110 binary), with read/write addressing yielding 0x5C (write) and 0x5D (read). Unlike the ADT7463, it does not support address select pins - this simplifies system integration but requires careful bus arbitration in multi-device configurations. The address is hard-coded and cannot be modified in hardware or firmware.
Does the ADT7468ARQZ-RL7 support both high-frequency and low-frequency PWM fan drive modes?
Yes, the ADT7468ARQZ-RL7 supports dual-mode PWM fan drive: high-frequency mode at 22.5 kHz (default, Config Register 5 Bit 1 = 0) and programmable low-frequency mode from 10 Hz to 100 Hz (Config Register 5 Bit 1 = 1). This flexibility allows designers to avoid audible coil whine (HF) or reduce EMI in sensitive analog sections (LF), unlike the ADT7463 which supports only low-frequency mode.
How does series resistance cancellation (SRC) work on the ADT7468ARQZ-RL7?
SRC on the ADT7468ARQZ-RL7 applies automatic correction to remote diode temperature measurements by injecting three different bias currents (6 μA, 36 μA, 96 μA) into the D1+/D1− and D2+/D2− channels and calculating the resulting voltage deltas. This eliminates linear offset caused by PCB trace resistance up to ~10 Ω, ensuring ±1.5°C accuracy even with long thermal sensor traces - a feature absent in the ADT7463 and most competing thermal controllers.
Can the ADT7468ARQZ-RL7 monitor Intel Pentium 4 PROCHOT signals?
Yes, the ADT7468ARQZ-RL7 can monitor Intel Pentium 4 PROCHOT signals using its bidirectional THERM pin (Pin 20 or Pin 14, configurable). When configured as input, it times PROCHOT assertions and triggers automatic fan speed increases; when configured as output, it asserts THERM to signal system overtemperature. This dual-role capability is explicitly documented for Pentium 4 thermal management in the ADT7468 Rev. A datasheet Section "Recommended Implementation".
What is the fail-safe cooling behavior of the ADT7468ARQZ-RL7 upon power-up?
Upon power-up, the ADT7468ARQZ-RL7 defaults to fan-off state. If VCCP is powered, fail-safe cooling activates full-speed fan operation 4.6 seconds after VCCP rise if no SMBus transaction has occurred. If VCCP remains unpowered, monitoring enables after the first SMBus access. This behavior prevents thermal runaway during boot failures - a key reliability enhancement over the ADT7463, which runs fans at full speed immediately on power-up.
Is the ADT7468ARQZ-RL7 compatible with VRM10 specifications?
Yes, the ADT7468ARQZ-RL7 supports VRM10 via VID5 signaling on Pin 21 (+12VIN/VID5), enabling direct readout of 6-bit VID codes from VRM10-compliant voltage regulators. This allows real-time core voltage tracking and dynamic THERM threshold calculation (2/3 × VCCP), a requirement for modern server platforms. The ADT7463 lacks VID5 support and is limited to VRM9.
ADT7468ARQZ-RL7 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-RL7 FAQ
1.How can I place an order for ADT7468ARQZ-RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADT7468ARQZ-RL7 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-RL7 reliable?
The price and inventory of ADT7468ARQZ-RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADT7468ARQZ-RL7 is usually 5 days.
3.What payment methods are accepted for ADT7468ARQZ-RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADT7468ARQZ-RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADT7468ARQZ-RL7?
ADT7468ARQZ-RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADT7468ARQZ-RL7 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-RL7?
For technical support, including ADT7468ARQZ-RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADT7468ARQZ-RL7 requirements.
6.How does Aetrix verify that ADT7468ARQZ-RL7 is sourced from the original manufacturer or authorized distributors?
All ADT7468ARQZ-RL7 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-RL7 meets industry standards.
7.What is the process for return or replacement of ADT7468ARQZ-RL7?
All ADT7468ARQZ-RL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADT7468ARQZ-RL7, 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-RL7 part is unused and in its original packaging.
Return procedure for ADT7468ARQZ-RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADT7468ARQZ-RL7 Tags
-
EMC2101-ACZL-TR
Microchip Technology
-
MCP9844T-BE/MNY
Microchip Technology
-
EMC2101-R-ACZL-TR
Microchip Technology
-
MCP98244T-BE/MNY
Microchip Technology
-
TC670ECHTR
Microchip Technology
-
SE98ATP,547
NXP Semiconductors
-
AMC6821SDBQR
Texas Instruments
-
MAX6604AATA+T
Analog Devices Inc./Maxim Integrated
-
ADT7475ARQZ-REEL
onsemi
-
MAX6643LBBAEE+
Analog Devices Inc./Maxim Integrated
-
MAX6684ESA+T
Analog Devices Inc./Maxim Integrated
-
MAX6639AEE+
Analog Devices Inc./Maxim Integrated
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