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Analog Devices Inc. ADM1031ARQ-REEL7
- Part No.:
- ADM1031ARQ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Thermal Management
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ADM1031ARQ-REEL7.pdf
- Description:
- TEMP MONITOR AND FAN CONTROL
- Quantity:
- Payment:
- Shipping:
Inventory:16,735
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Product details
Overview
ADM1031ARQ-REEL7 from Analog Devices is a three-channel ACPI-compliant digital thermometer and dual PWM fan controller optimized for Pentium III systems. It provides ±1°C remote diode temperature accuracy (two channels), 0.25°C local sensor resolution, independent automatic fan speed control via two open-drain PWM outputs, and overtemperature THERM output for CPU throttling - enabling thermal guardband reduction in notebook PCs and servers.
For engineers reviewing the ADM1031ARQ-REEL7 datasheet, ADM1031ARQ-REEL7 pinout, ADM1031ARQ-REEL7 application, or ADM1031ARQ-REEL7 equivalent, key selection criteria include SMBus-compatible dual-fan PWM control with tach feedback, ±1°C remote diode accuracy across two channels, programmable INT/THERM outputs, and 3.0–5.5 V supply operation in QSOP-16 packaging.
Technical Context
The ADM1031ARQ-REEL7 integrates a 10-bit ADC for local ambient sensing and dual remote diode interfaces with current-source switching (180 μA high / 11 μA low) to measure substrate transistors or discrete 2N3904s. Its fan control loop operates autonomously without CPU intervention, using configurable PWM duty cycle (33–100%) and selectable divisors (N = 1/2/4/8) for tach input scaling.
It implements SMBus 1.1 protocol with hardwired ADD pin addressing (three possible slave addresses), supports Alert Response Address (ARA = 0x18), and features dedicated open-drain outputs: THERM (fail-safe overtemperature), FAN_FAULT (stall detection), and INT (SMBALERT). All digital I/Os meet VIH ≥ 2.1 V and VIL ≤ 0.8 V thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0–5.5 V - enables direct connection to 3.3 V standby rail for low-power thermal monitoring. |
| Local Temp Accuracy | ±1°C - ensures reliable ambient temperature tracking for system-level thermal margining. |
| Remote Diode Accuracy | ±1°C (D1), ±1.75°C (D2) - validated at 60–100°C for CPU die and GPU or VRM hotspot monitoring. |
| PWM Output Duty Cycle | 33%–100% - delivers smooth, acoustically optimized fan speed transitions without abrupt step changes. |
| Tach Input Range | 550–4400 RPM - supports common 2-wire and 3-wire fans via programmable divisor and analog reconfiguration. |
| SMBus Clock Frequency | 10–100 kHz - compatible with standard ACPI-compliant host controllers without timing violation. |
| Standby Current | 32–50 μA - minimizes battery drain during S3/S4 sleep states in mobile platforms. |
Pinout & Package
ADM1031ARQ-REEL7 is housed in a 16-lead QSOP package (θJA = 105°C/W), surface-mount compatible with standard reflow profiles and rated for –40°C to +125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWM_OUT1 (Pin 1) | Open-drain PWM output | Drives FAN1 speed; requires external 10 kΩ pull-up to VCC for logic-level compatibility. |
| TACH1/AIN1 (Pin 2) | Reconfigurable tach/analog input | Measures FAN1 RPM via tach pulses or 2-wire fan current through sense resistor (2 Ω typical). |
| PWM_OUT2 (Pin 3) | Open-drain PWM output | Drives FAN2 independently; supports staggered spin-up and fault-isolated control. |
| TACH2/AIN2 (Pin 4) | Reconfigurable tach/analog input | Enables dual-fan redundancy monitoring; reprogrammable as analog input for legacy fan types. |
| VCC (Pin 6) | Power supply input | Accepts 3.3 V or 5 V; powers internal bandgap reference and ADC without external regulators. |
| THERM (Pin 7) | Fail-safe overtemperature I/O | Active-low output to throttle CPU clock; also accepts external low signal to force full fan speed. |
| FAN_FAULT (Pin 8) | Fan failure indicator | Asserts on stall detection; can drive second fan to full speed for thermal failover. |
| D1+/D1– (Pins 10/9) | First remote diode interface | Connects to Pentium III substrate transistor anode/cathode for die temperature measurement. |
| D2+/D2– (Pins 12/11) | Second remote diode interface | Supports discrete NPN/PNP transistor or diode for secondary hotspot (e.g., VRM, chipset) monitoring. |
| ADD (Pin 13) | SMBus address select | Three-state input (GND/VCC/open) sets LSBs of 7-bit address to avoid bus conflicts in multi-sensor systems. |
| INT (Pin 14) | Programmable interrupt output | Configurable as SMBALERT or general-purpose interrupt for temp/fan fault notification. |
| SDA (Pin 15) | SMBus bidirectional data | Open-drain interface requiring 2.2 kΩ pull-up; supports read/write register access and ARA response. |
| SCL (Pin 16) | SMBus clock input | Asynchronous clock input; defines timing for all serial transactions per SMBus 1.1 spec. |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous fan control loop | Operates without CPU software intervention - maintains thermal safety even during system lockup or OS crash. |
| Dual remote diode inputs | Supports simultaneous CPU die and VRM/chipset temperature monitoring with ±1°C accuracy at 60–100°C. |
| Reconfigurable tach/analog inputs | Each tach channel (TACH1/AIN1, TACH2/AIN2) can be switched to analog mode for 2-wire fan speed sensing. |
| Fail-safe THERM output | Hardware-level overtemperature signal directly throttles CPU clock - no firmware dependency required. |
| Programmable temperature offsets | 5-bit two's complement offset registers allow ±15°C correction per channel to compensate for PCB thermal gradients. |
Applications
| Notebook PC Thermal Management | Network Server Fan Control |
|---|---|
Use Scenario: Real-time CPU and GPU die temperature monitoring with adaptive fan speed adjustment during variable workloads. IC Role / Device Role / Timing Role: Dual remote diode interface measures Pentium III substrate and discrete transistor; local sensor tracks chassis ambient. Use Value: Enables 1°C guardband reduction versus legacy solutions, increasing sustained CPU performance by up to 8% under thermal constraint. |
Use Scenario: Redundant cooling control across dual CPU sockets and power delivery modules in 1U/2U rack servers. IC Role / Device Role / Timing Role: Independent PWM_OUT1/PWM_OUT2 drive separate fan zones; FAN_FAULT triggers cross-zone failover. Use Value: Eliminates single-point fan failure risk while maintaining <±1.5°C thermal uniformity across 12+ DIMM slots and dual CPUs. |
| Telecom Equipment Thermal Protection | Industrial Embedded Controller Cooling |
Use Scenario: Overtemperature shutdown and acoustic noise optimization in fan-cooled base station power amplifiers. IC Role / Device Role / Timing Role: THERM output directly gates RF amplifier enable line; INT signals thermal alarm to host MCU via SMBus. Use Value: Prevents catastrophic thermal runaway in sealed enclosures by triggering hardware-level power-down within 100 ms of threshold breach. |
Use Scenario: Long-life thermal supervision in fan-cooled PLCs and motor drives operating continuously at 70°C ambient. IC Role / Device Role / Timing Role: Local sensor monitors controller junction; remote diodes track IGBT heatsink and DC-link capacitor temperatures. Use Value: Extends component lifetime by limiting peak junction temperatures to <115°C despite 20-year field deployment requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-fan thermal management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM96163CIMTX/NOPB | Single PWM output; higher local sensor accuracy (±0.75°C); no THERM pin; SMBus 2.0 compliant. | Lacks autonomous dual-fan control and hardware throttling - requires host firmware coordination for overtemp response. | Choose when only one fan zone is needed and higher local precision outweighs missing fail-safe THERM functionality. |
| MAX6657MEE+ | Two remote diode inputs but no PWM outputs; relies on external MOSFET drivers; 12-bit local resolution. | Requires external fan driver circuitry and microcontroller-based control loop - increases BOM count and design complexity. | Prefer when system already includes dedicated fan driver ICs and thermal policy is managed entirely in firmware. |
Compared with LM96163CIMTX/NOPB and MAX6657MEE+, the ADM1031ARQ-REEL7 uniquely integrates dual autonomous PWM control, hardware THERM throttling, and failover-capable FAN_FAULT - delivering complete thermal safety without host CPU involvement or external driver components.
Availability
ADM1031ARQ-REEL7 is available at Aetrix Electronics and suitable for notebook PCs, network servers, and telecommunications equipment requiring stable component supply, long-lifecycle support, and guaranteed thermal performance consistency across production batches.
Supply support for ADM1031ARQ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and computing markets since 1965.
The ADM1031ARQ-REEL7 belongs to Analog Devices' thermal management product line, designed specifically for ACPI-compliant, fan-cooled computing platforms where autonomous, fail-safe thermal regulation is critical to system reliability.
FAQ
What is the primary function of the ADM1031ARQ-REEL7 in a thermal management system?
The ADM1031ARQ-REEL7 serves as a self-contained thermal supervisor that simultaneously monitors local ambient temperature and two remote diode sources (e.g., CPU die and VRM), then autonomously controls two PWM fans without CPU intervention. Its integrated THERM output provides hardware-level CPU throttling during overtemperature events, making ADM1031ARQ-REEL7 essential for fail-safe thermal protection in notebooks and servers.
Does the ADM1031ARQ-REEL7 support both 3.3 V and 5 V supply rails?
Yes, the ADM1031ARQ-REEL7 operates across a 3.0–5.5 V supply range, allowing direct connection to either 3.3 V standby power (for S3/S4 monitoring) or main 5 V rail. Its 32–50 μA standby current at 3.3 V makes ADM1031ARQ-REEL7 ideal for battery-sensitive mobile platforms, while full functionality is maintained at 5 V in server applications.
How does the ADM1031ARQ-REEL7 achieve ±1°C remote diode accuracy?
The ADM1031ARQ-REEL7 uses a delta-VBE technique - measuring the voltage difference across a remote diode or substrate transistor at two precisely controlled current levels (180 μA high / 11 μA low). This eliminates device-to-device VBE variation, yielding ±1°C accuracy between 60°C and 100°C - a specification confirmed for ADM1031ARQ-REEL7 in its datasheet Table 1.
Can the tachometer inputs on the ADM1031ARQ-REEL7 measure 2-wire fan speed?
Yes, pins TACH1/AIN1 (Pin 2) and TACH2/AIN2 (Pin 4) are reconfigurable: they operate as digital tach inputs for 3-wire fans by default, but can be programmed as analog inputs to measure voltage drop across a 2 Ω sense resistor in 2-wire fan return paths. This dual-mode capability is a defined feature of ADM1031ARQ-REEL7 per its Pin Function Descriptions table.
What is the role of the ADD pin on the ADM1031ARQ-REEL7?
The ADD pin (Pin 13) is a three-state input that sets the two least-significant bits of the ADM1031ARQ-REEL7's 7-bit SMBus address - supporting GND (00), open-circuit (10), or VCC (01) configurations. This allows up to three ADM1031ARQ-REEL7 devices on the same SMBus without address conflict, a capability explicitly documented in the ADD Pin Truth Table of the ADM1031 datasheet Rev. B.
ADM1031ARQ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- 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:
- 0°C ~ 100°C, External Sensor
- Accuracy:
- ±1°C Local, ±0.5°C Remote
- Topology:
- ADC, Comparator, Multiplexer, Register Bank
- Output Type:
- SMBus
- Output Alarm:
- Yes
- Output Fan:
- Yes
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- 0°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
ADM1031ARQ-REEL7 FAQ
1.How can I place an order for ADM1031ARQ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM1031ARQ-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 ADM1031ARQ-REEL7 reliable?
The price and inventory of ADM1031ARQ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM1031ARQ-REEL7 is usually 5 days.
3.What payment methods are accepted for ADM1031ARQ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM1031ARQ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM1031ARQ-REEL7?
ADM1031ARQ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM1031ARQ-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 ADM1031ARQ-REEL7?
For technical support, including ADM1031ARQ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM1031ARQ-REEL7 requirements.
6.How does Aetrix verify that ADM1031ARQ-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADM1031ARQ-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 ADM1031ARQ-REEL7 meets industry standards.
7.What is the process for return or replacement of ADM1031ARQ-REEL7?
All ADM1031ARQ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM1031ARQ-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 ADM1031ARQ-REEL7 part is unused and in its original packaging.
Return procedure for ADM1031ARQ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADM1031ARQ-REEL7 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
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
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ADT7475ARQZ-REEL
onsemi
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MAX6643LBBAEE+
Analog Devices Inc./Maxim Integrated
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MAX6684ESA+T
Analog Devices Inc./Maxim Integrated
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MAX6639AEE+
Analog Devices Inc./Maxim Integrated
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