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Analog Devices Inc. ADM1027ARQ
- Part No.:
- ADM1027ARQ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Thermal Management
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ADM1027ARQ.pdf
- Description:
- DBCOOL REMOTE THERMAL CONTROLLER
- Quantity:
- Payment:
- Shipping:
Inventory:7,340
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Product details
Overview
ADM1027ARQ from Analog Devices is a dBCOOL™ remote thermal controller and voltage monitor IC designed for noise-sensitive PC and telecom systems. It monitors five supply voltages (12 V, 5 V, 2.5 V, VCCP, VCC), two remote diode temperature sensors plus on-chip sensor, and controls four PWM fan outputs with automatic speed regulation based on thermal feedback.
For engineers reviewing the ADM1027ARQ datasheet, ADM1027ARQ pinout, ADM1027ARQ application, or ADM1027ARQ equivalent, this page delivers verified technical context, SMBus 2.0–compliant timing specs, real-world fan control resolution (±6% RPM accuracy), thermal sensing accuracy (±1 °C at 40 °C), and precise QSOP-24 package mapping - all critical for low-acoustic system cooling design.
Technical Context
The ADM1027ARQ integrates a 10-bit ADC with analog multiplexer, bandgap reference, and dedicated signal conditioning for six analog inputs (four voltage rails + two remote diode channels) and local temperature sensing. Its SMBus 2.0 interface supports address selection via Pin 13/14 and optional SMBALERT interrupt output.
It implements automatic fan speed control using programmable TMIN and TRANGE registers per PWM channel, enabling closed-loop thermal management without CPU intervention. Enhanced Acoustics registers allow fine-tuning of PWM transition behavior to minimize audible fan ramping artifacts in quiet environments.
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, with rescalable VCC attenuators |
| Temperature Sensing Accuracy | ±1 °C at TA = 40 °C - enables precise thermal margining for CPU and chipset thermal management |
| Fan Speed Measurement Accuracy | ±6% (0 °C to 70 °C) - ensures reliable closed-loop RPM control across industrial temperature range |
| SMBus Compatibility | Fully SMBus 2.0 electrical compliant, 10–100 kHz clock - interoperable with standard system management controllers |
| ADC Resolution | 10-bit with 0.25 °C temperature resolution - provides granular thermal feedback for smooth fan response |
| Remote Diode Support | D1+/D1− and D2+/D2− inputs - compatible with CPU thermal diodes and discrete transistors (e.g., 2N3906) |
| VID Monitoring | 5-bit VID0–VID4 inputs - reads VRM9.x-compliant processor core voltage ID codes for dynamic VCCP tracking |
Pinout & Package
ADM1027ARQ is housed in a 24-lead QSOP package (RQ-24), with θJA = 123 °C/W and θJC = 27 °C/W thermal characteristics. Pin functions are validated per Analog Devices' official datasheet Rev. 0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SDA) | SMBus bidirectional serial data | Open-drain I/O requiring external pull-up; carries register read/write commands and status data |
| 2 (SCL) | SMBus serial clock input | Open-drain input synchronized to master clock; defines timing for all bus transactions |
| 4 (VCC) | Main power supply input | Monitored supply rail; configurable for 3.3 V or 5 V operation via Configuration Register Bit 7 |
| 5–8, 19 (VID0–VID4) | Processor VID code inputs | Open-drain digital inputs capturing VRM9.x-compliant core voltage ID bits for real-time VCCP tracking |
| 9, 11–12, 14 (TACH1–TACH4) | Fan tachometer inputs | Open-drain digital inputs measuring 2- or 3-wire fan RPM; reconfigurable as analog inputs (AIN1–AIN4) |
| 10, 13, 24 (PWM2/SMBALERT, PWM3/ADDR_EN, PWM1/XTO) | PWM fan control outputs | Open-drain outputs driving external FETs; PWM2 doubles as SMBALERT interrupt when configured |
| 15–18 (D2−, D2+, D1−, D1+) | Remote thermal diode interfaces | Differential inputs supporting two external diode-connected transistors for board-level and CPU die temperature sensing |
| 20–23 (5VIN, 12VIN, 2.5VIN, VCCP) | Analog voltage monitoring inputs | Attenuated inputs calibrated for 5 V, 12 V, 2.5 V, and 0–3 V core voltage rails respectively |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Fan Speed Control Loop | Programmable TMIN and TRANGE registers per PWM channel enable fully autonomous thermal regulation without host CPU polling |
| Enhanced Acoustic Mode | Configurable PWM transition smoothing reduces perceptible fan speed changes - critical for office and home PC acoustic targets |
| Multi-Rail Voltage Monitoring | Simultaneous measurement of 12 V, 5 V, 2.5 V, VCCP, and VCC with ±1.5% total unadjusted error (excluding 12 V input) |
| Triple Temperature Sensing | On-chip bandgap sensor + two remote diode channels deliver localized thermal visibility across CPU, chipset, and ambient zones |
| SMBus Address Flexibility | Three hardwired SMBus addresses (0x58, 0x5A, 0x5C) via Pin 13/14 strapping - avoids bus conflicts in multi-controller systems |
Applications
| Desktop PC Thermal Management | Network Equipment Cooling |
|---|---|
|
Use Scenario: Maintaining acoustic compliance in high-performance desktop PCs with multi-core CPUs and discrete GPUs. IC Role / Device Role / Timing Role: Central thermal supervisor coordinating fan speeds across CPU, GPU, and chipset heatsinks using local and remote diode readings. Use Value: Enables fan speeds to scale precisely with die temperature (±1 °C accuracy), reducing idle noise while preventing thermal throttling under load. |
Use Scenario: Sustaining stable operation in 1U rack-mounted switches and routers with dense component layouts and limited airflow. IC Role / Device Role / Timing Role: Real-time voltage and temperature guardian for ASICs, PHYs, and power stages - triggering SMBALERT on out-of-limit events. Use Value: Monitors five supply rails and two remote diodes simultaneously, allowing early detection of thermal runaway before system-level failure. |
| Low-Noise Workstation Systems | Embedded Telecom Baseband Units |
|
Use Scenario: Fan-cooled medical imaging or audio production workstations requiring near-silent operation during sensitive tasks. IC Role / Device Role / Timing Role: dBCOOL™ controller executing enhanced acoustic PWM transitions to suppress fan "whine" during speed adjustments. Use Value: Reduces user-perceived acoustic variation by smoothing PWM duty cycle ramps - verified in subjective listening tests per Analog Devices' application notes. |
Use Scenario: Baseband processing units in 4G/LTE small cells where thermal density demands active cooling but EMI constraints limit switching frequency options. IC Role / Device Role / Timing Role: Dual-role device: voltage monitor for DC/DC converters and thermal regulator for FPGA and RF front-end heatsinks. Use Value: Integrates 10-bit ADC, SMBus 2.0 interface, and four PWM outputs in one QSOP-24 package - minimizing BOM count and PCB footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar remote thermal controller and voltage monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM1030ARQZ | Single remote diode channel (vs. dual), no VID monitoring, lower fan count (3 vs. 4), identical QSOP-24 package | Limited to simpler thermal architectures without CPU VID tracking or redundant diode sensing | Select when cost sensitivity outweighs need for dual-diode redundancy or full VRM9.x support |
| LM95235CIMMX | Two remote diodes + on-die sensor, no voltage monitoring, no PWM outputs, only SMBus-compatible (not SMBus 2.0–compliant) | Requires external fan controller; suited for pure thermal telemetry where voltage supervision is handled elsewhere | Choose when system already includes dedicated voltage supervisors and fan drivers, and only thermal intelligence is needed |
Compared with ADM1027ARQ, ADM1030ARQZ sacrifices VID decoding and one remote diode channel for lower cost and reduced feature set, while LM95235CIMMX offers thermal-only sensing with no integrated fan control - making ADM1027ARQ uniquely suited for compact, self-contained thermal management in acoustically constrained platforms.
Availability
ADM1027ARQ is available at Aetrix Electronics and suitable for low-acoustic noise PCs, networking equipment, and embedded telecom baseband units requiring stable component supply across extended product lifecycles.
Supply support for ADM1027ARQ 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.
The ADM1027ARQ belongs to Analog Devices' dBCOOL™ family of thermal management ICs, engineered specifically for active cooling control in noise-sensitive computing and communications platforms.
FAQ
What is the primary function of the ADM1027ARQ?
The ADM1027ARQ is a dBCOOL™ remote thermal controller and voltage monitor IC that simultaneously measures five supply voltages, three temperature sources (on-chip + two remote diodes), and controls four PWM fan outputs. Its core function is autonomous thermal regulation in acoustically sensitive systems - the ADM1027ARQ executes closed-loop fan speed control without CPU intervention once TMIN and TRANGE registers are programmed.
Does the ADM1027ARQ support SMBus 2.0?
Yes, the ADM1027ARQ meets SMBus 2.0 electrical specifications and is fully SMBus 1.1 compliant. It supports clock frequencies from 10 kHz to 100 kHz, glitch immunity of 50 ns, and includes SMBus Timeout (15–35 ms) - all verified in the official datasheet Rev. 0. The ADM1027ARQ also supports Alert Response Address (ARA) for multi-device interrupt arbitration on shared buses.
How many remote temperature sensors does the ADM1027ARQ support?
The ADM1027ARQ supports two remote temperature sensors via dedicated D1+/D1− and D2+/D2− differential inputs. These accept diode-connected transistors (e.g., 2N3906) or CPU-integrated thermal diodes. Combined with its on-chip bandgap temperature sensor, the ADM1027ARQ provides triple-point thermal visibility - essential for correlating die, package, and ambient temperatures in high-performance systems.
What package type is used for the ADM1027ARQ?
The ADM1027ARQ uses a 24-lead QSOP package (RQ-24), with thermal characteristics θJA = 123 °C/W and θJC = 27 °C/W. This surface-mount package is pin-compatible with other members of the ADM102x family and is optimized for compact motherboard layouts in space-constrained applications like 1U servers and blade chassis - the ADM1027ARQ's RQ-24 footprint is explicitly defined in the ordering guide and pin configuration diagram.
Can the ADM1027ARQ monitor processor core voltage (VCCP)?
Yes, the ADM1027ARQ monitors VCCP via Pin 23, an analog input calibrated for 0 V to 3 V range - matching typical Pentium 4 and Athlon XP core voltage rails. It also reads the processor's 5-bit VID code (VID0–VID4 on Pins 5–8 and 19) to dynamically track VRM9.x-compliant voltage scaling. This dual-path VCCP supervision - direct analog measurement plus VID decoding - is a defining capability of the ADM1027ARQ.
ADM1027ARQ 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:
- 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 FAQ
1.How can I place an order for ADM1027ARQ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM1027ARQ 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 reliable?
The price and inventory of ADM1027ARQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM1027ARQ is usually 5 days.
3.What payment methods are accepted for ADM1027ARQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM1027ARQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM1027ARQ?
ADM1027ARQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM1027ARQ 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?
For technical support, including ADM1027ARQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM1027ARQ requirements.
6.How does Aetrix verify that ADM1027ARQ is sourced from the original manufacturer or authorized distributors?
All ADM1027ARQ 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 meets industry standards.
7.What is the process for return or replacement of ADM1027ARQ?
All ADM1027ARQ units undergo pre-shipment inspection (PSI). If there is an issue with ADM1027ARQ, 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 part is unused and in its original packaging.
Return procedure for ADM1027ARQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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