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Analog Devices Inc. ADM1027ARQ-REEL
- Part No.:
- ADM1027ARQ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Thermal Management
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ADM1027ARQ-REEL.pdf
- Description:
- DBCOOL REMOTE THERMAL CONTROLLER
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
ADM1027ARQ-REEL from Analog Devices is a dBCOOL™ remote thermal controller and voltage monitor IC designed for active cooling management in noise-sensitive systems. It monitors up to five supply voltages (12 V, 5 V, 2.5 V, VCCP, VCC), measures local and two remote diode temperatures with ±1 °C accuracy at 40 °C, and controls four PWM fan outputs - all via SMBus 2.0 interface. It is deployed in low-acoustic PCs and telecom equipment requiring autonomous fan speed regulation.
For engineers reviewing the ADM1027ARQ-REEL datasheet, ADM1027ARQ-REEL pinout, ADM1027ARQ-REEL application, or ADM1027ARQ-REEL equivalent, key selection considerations include its dual remote diode sensing capability, VID0–VID4 CPU voltage ID monitoring, enhanced acoustic PWM control mode, and QSOP-24 package compatibility with SMBus address select functionality.
Technical Context
The ADM1027ARQ-REEL integrates a 10-bit ADC with analog multiplexer, bandgap reference, and dedicated signal conditioning for six analog inputs (four voltage rails + two temperature diodes), plus an on-chip temperature sensor. Its automatic fan speed control loop uses programmable TMIN and TRANGE registers to define temperature-to-PWM response curves without CPU intervention.
It implements SMBus 2.0-compliant serial interface with configurable slave address (0x58/0x5A/0x5C), optional SMBALERT interrupt output (reconfigurable from PWM2), and hardware-based address selection via pins 13 and 14. All digital I/Os are open-drain with defined VIH/VIL thresholds and hysteresis for noise immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0 V to 5.5 V - supports both 3.3 V standby and 5 V main rail powering |
| Local Temp Accuracy | ±1 °C at TA = 40 °C - enables precise ambient thermal feedback for cooling algorithms |
| Remote Diode Accuracy | ±1 °C at TD = 40 °C and TA = 40 °C - ensures reliable CPU/die temperature tracking |
| Fan Speed Inputs | 4 tachometer inputs (TACH1–TACH4) - supports 2-wire or 3-wire fans with reconfigurable analog input mode |
| PWM Outputs | 3 dedicated PWM outputs (PWM1–PWM3) - drives fan motors with adjustable duty cycle and acoustic enhancement registers |
| SMBus Compliance | Fully SMBus 2.0 electrical spec compliant - guarantees interoperability with standard system management controllers |
| Package | 24-lead QSOP (RQ-24) - surface-mount footprint with θJA = 123 °C/W for thermal-aware PCB layout |
Pinout & Package
ADM1027ARQ-REEL is housed in a 24-lead QSOP (RQ-24) package with 0.635 mm lead pitch and exposed pad not present. Pin functions are validated per Analog Devices' official ADM1027 datasheet Rev. 0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SDA) | SMBus bidirectional data line | Open-drain I/O requiring external pull-up; carries register reads/writes and SMBALERT signaling when enabled |
| 2 (SCL) | SMBus clock input | Open-drain input synchronized to master clock; defines timing for all serial transactions |
| 4 (VCC) | Main power supply input | Supplies internal circuitry and is itself monitored; supports 3.3 V or 5 V with rescaling via Configuration Register 1 |
| 5–8, 19 (VID0–VID4) | CPU voltage ID inputs | Open-drain digital inputs capturing VRM9.x/VRM10-compatible VID codes for core voltage identification |
| 9, 11–12, 14 (TACH1–TACH4) | Fan tachometer inputs | Open-drain inputs accepting pulse trains from fan tach outputs; configurable as analog inputs for 2-wire fan support |
| 10 (PWM2/SMBALERT) | Multi-function output | Configurable as PWM2 output or SMBALERT interrupt - asserts low on limit violation when enabled |
| 13 (PWM3/ADDR_EN) | Address enable control | Pulled low at power-up to enter Address Select Mode; otherwise defaults to PWM3 output |
| 15–18 (D2–, D2+, D1–, D1+) | Remote thermal diode interfaces | Differential pairs for connecting external thermal diodes (e.g., 2N3906 or CPU-integrated diodes) |
| 20–23 (5VIN, 12VIN, 2.5VIN, VCCP) | Analog voltage monitor inputs | Attenuated inputs calibrated for specific rails: 5 V, 12 V, chipset 2.5 V, and processor core voltage (0–3 V range) |
| 24 (PWM1/XTO) | Primary PWM output | Open-drain PWM1 output for Fan 1 control; doubles as XOR test output in diagnostic mode |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced Acoustic Mode | Adjusts PWM slew rate and step resolution to minimize audible fan speed transitions without compromising thermal response |
| Automatic Fan Speed Control | Self-contained closed-loop control using programmable TMIN and TRANGE registers - eliminates host CPU polling overhead |
| Dual Remote Diode Sensing | Simultaneous monitoring of two external thermal diodes (e.g., CPU die + GPU or VRM) with independent offset compensation |
| VID Monitoring (5-bit) | Direct capture of VRM9.x/VRM10-compliant VID signals to dynamically track processor core voltage requirements |
| SMBus Address Select | Hardware-configurable slave address (0x58/0x5A/0x5C) via pins 13 and 14 - enables multiple ADM1027ARQ-REEL units on same bus |
Applications
| Low-Acoustic Desktop PCs | Telecom Line Cards |
|---|---|
Use Scenario: Desktop motherboard requiring silent operation during idle and light-load conditions while maintaining safe CPU/GPU junction temperatures. IC Role / Device Role / Timing Role: Central thermal manager that autonomously adjusts four fan speeds based on local ambient, CPU diode, and chipset diode temperatures. Use Value: Reduces user-perceived noise by >15 dB(A) through smooth PWM ramping and eliminates CPU-driven polling latency in thermal response. |
Use Scenario: High-density telecom line card with multiple ASICs and power stages generating localized hot spots under variable traffic loads. IC Role / Device Role / Timing Role: System-level voltage and temperature supervisor coordinating cooling across multiple thermal zones via SMBus. Use Value: Prevents thermal throttling by triggering fan acceleration within 13 ms of remote diode temperature crossing threshold - faster than host-initiated polling loops. |
| Network Switch Chassis | Industrial Embedded Controllers |
Use Scenario: 1U rack-mounted switch with constrained airflow where fan speed must scale precisely with port utilization and ambient temperature. IC Role / Device Role / Timing Role: Multi-rail voltage monitor (12 V, 5 V, 2.5 V, VCCP) and four-fan PWM controller with real-time VID tracking for dynamic power state awareness. Use Value: Enables predictive fan control using combined voltage droop and temperature trends - extends fan lifetime by reducing unnecessary high-RPM operation. |
Use Scenario: Fan-cooled industrial PLC or motion controller operating in extended temperature range (0 °C to 105 °C) with strict EMI and reliability requirements. IC Role / Device Role / Timing Role: Robust thermal guardrail device with ±3 °C remote diode accuracy over full industrial range and SMBus timeout recovery. Use Value: Guarantees fail-safe thermal shutdown via hardware limit comparators - independent of host firmware execution integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thermal management and voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM1030ARQZ-REEL | Single remote diode input (vs. dual), no VID monitoring, lower fan count (2 vs. 4), identical QSOP-24 package | Limited to simpler thermal zones; lacks CPU voltage ID tracking required for adaptive core voltage cooling | Select when only one critical thermal zone exists and VID feedback is unnecessary |
| LM95235CIMMX/NOPB | Two remote diodes + local sensor, no voltage monitoring, no PWM outputs, only SMBus temperature reporting | Requires external fan controller; suitable for monitoring-only roles where actuation is handled elsewhere | Choose when thermal visibility is needed without integrated fan drive or power rail supervision |
Compared with ADM1027ARQ-REEL, ADM1030ARQZ-REEL reduces thermal supervision scope and eliminates VID-based voltage coordination, while LM95235CIMMX/NOPB provides pure temperature telemetry without any actuation capability - making ADM1027ARQ-REEL uniquely suited for fully autonomous, multi-zone cooling systems.
Availability
ADM1027ARQ-REEL is available at Aetrix Electronics and suitable for low-acoustic PCs, telecom line cards, and network switch chassis requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for ADM1027ARQ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.
The ADM1027ARQ-REEL belongs to Analog Devices' dBCOOL™ family of thermal management ICs, engineered specifically for autonomous, low-noise system cooling in PC and networking platforms where acoustic performance and thermal reliability are co-optimized.
FAQ
What is the primary function of the ADM1027ARQ-REEL?
The ADM1027ARQ-REEL is a complete remote thermal controller and voltage monitor IC. It autonomously monitors up to five supply voltages, two remote thermal diodes, and local temperature while controlling four PWM fan outputs via SMBus. Its core function is enabling silent, responsive cooling in PCs and telecom equipment without continuous CPU involvement - a capability confirmed in the ADM1027 datasheet Rev. 0 functional description and block diagram.
Does the ADM1027ARQ-REEL support dual remote temperature sensing?
Yes, the ADM1027ARQ-REEL supports dual remote temperature sensing via dedicated D1+/D1− and D2+/D2− differential inputs, each capable of interfacing with external thermal diodes such as the 2N3906 or integrated CPU diodes. This is explicitly documented in the Functional Block Diagram, General Description, and PIN FUNCTION DESCRIPTIONS sections of the ADM1027 datasheet Rev. 0.
Can the ADM1027ARQ-REEL monitor processor core voltage (VCCP)?
Yes, the ADM1027ARQ-REEL monitors processor core voltage via the VCCP analog input (Pin 23), which accepts 0 V to 3 V signals - matching typical VRM output ranges. The datasheet specifies this input's calibration and confirms VID0–VID4 bit monitoring (Pins 5, 6, 7, 8, 19) for dynamic CPU voltage identification, enabling coordinated thermal-voltage response in the ADM1027ARQ-REEL.
How does the ADM1027ARQ-REEL implement SMBus address configuration?
The ADM1027ARQ-REEL uses pins 13 (PWM3/ADDR_EN) and 14 (TACH4/ADDR_SELECT) for hardware SMBus address selection. When Pin 13 is pulled low at power-up, Pin 14 determines the slave address: low = 0x58h, high = 0x5Ah. If Pin 13 is high, it defaults to 0x5Ch. This behavior is defined in the "ADM1027 Address Selection" section and Table I of the ADM1027 datasheet Rev. 0.
What is the purpose of the Enhanced Acoustic Mode in the ADM1027ARQ-REEL?
The Enhanced Acoustic Mode in the ADM1027ARQ-REEL reduces user-perceived fan noise by smoothing PWM transition steps and limiting slew rate - preventing abrupt speed changes that generate audible tonal artifacts. This feature is implemented via dedicated "Enhance Acoustics Registers" described in the Functional Description section of the ADM1027 datasheet Rev. 0.
ADM1027ARQ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- 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:
- 0°C ~ 105°C, External Sensor
- Accuracy:
- ±1°C
- 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:
- 0°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QSOP
ADM1027ARQ-REEL FAQ
1.How can I place an order for ADM1027ARQ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM1027ARQ-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 ADM1027ARQ-REEL reliable?
The price and inventory of ADM1027ARQ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM1027ARQ-REEL is usually 5 days.
3.What payment methods are accepted for ADM1027ARQ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM1027ARQ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM1027ARQ-REEL?
ADM1027ARQ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM1027ARQ-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 ADM1027ARQ-REEL?
For technical support, including ADM1027ARQ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM1027ARQ-REEL requirements.
6.How does Aetrix verify that ADM1027ARQ-REEL is sourced from the original manufacturer or authorized distributors?
All ADM1027ARQ-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 ADM1027ARQ-REEL meets industry standards.
7.What is the process for return or replacement of ADM1027ARQ-REEL?
All ADM1027ARQ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM1027ARQ-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 ADM1027ARQ-REEL part is unused and in its original packaging.
Return procedure for ADM1027ARQ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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