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Analog Devices Inc. ADM1027ARQZ-REEL
- Part No.:
- ADM1027ARQZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Thermal Management
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ADM1027ARQZ-REEL.pdf
- Description:
- DBCOOL REMOTE THERMAL CONTROLLER
- Quantity:
- Payment:
- Shipping:
Inventory:35,400
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Product details
Overview
ADM1027ARQZ-REEL from Analog Devices is a dBCOOL™ remote thermal controller and voltage monitor IC designed for noise-sensitive PC and telecom 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, controls four PWM fan outputs, and supports SMBus 2.0 communication for system-level thermal management.
For engineers reviewing the ADM1027ARQZ-REEL datasheet, ADM1027ARQZ-REEL pinout, ADM1027ARQZ-REEL application, or ADM1027ARQZ-REEL equivalent, key selection criteria include remote diode temperature accuracy, multi-rail voltage monitoring capability, automatic fan speed control loop programmability, SMBus address configuration flexibility, and acoustic enhancement register support.
Technical Context
The ADM1027ARQZ-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). Its thermal sensing architecture supports both on-chip ambient sensing and external diode-based remote sensing using D1+/– and D2+/– terminals with 200 µA source current.
It implements fully autonomous fan control via three PWM outputs (PWM1–PWM3) and one reconfigurable tachometer input (TACH4), with programmable TMIN and TRANGE registers defining temperature-to-speed transfer functions. The device operates as an SMBus slave with configurable 7-bit address (default 0x5C) and optional SMBALERT interrupt output on PWM2 pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0 V to 5.5 V - supports direct connection to 3.3 V standby or 5 V main rail with internal attenuator rescaling |
| 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 ±6% RPM accuracy |
| 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 compatible with automated PCB assembly |
| Operating Temperature | 0 °C to +105 °C - qualified for industrial and high-ambient computing environments |
Pinout & Package
ADM1027ARQZ-REEL is housed in a 24-lead QSOP package (RQ-24), measuring 8.65 mm × 3.90 mm × 1.35 mm, with 0.635 mm lead pitch and gull-wing leads suitable for reflow soldering.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SDA) | SMBus bidirectional serial data I/O | Open-drain interface requiring external pull-up; enables register read/write and status polling |
| 2 (SCL) | SMBus serial clock input | Open-drain clock line synchronized to master; defines timing for all bus transactions |
| 4 (VCC) | Main power supply input | Also monitored as system supply rail; supports 3.3 V or 5 V operation with register-configurable scaling |
| 5–8, 19 (VID0–VID4) | Processor voltage ID inputs | Reads VRM9.x/VRM10-compliant CPU VID code for real-time core voltage identification |
| 9, 11–12, 14 (TACH1–TACH4) | Fan tachometer inputs | Open-drain digital inputs configurable as analog channels (AIN1–AIN4) for 2-wire fan support |
| 10 (PWM2/SMBALERT) | Dual-function output | Configurable as PWM fan driver or SMBALERT interrupt output for out-of-limit condition signaling |
| 13 (PWM3/ADDR_EN) | Address enable control | Pulled low at power-up to enter Address Select Mode; determines SMBus slave address with Pin 14 |
| 15–18 (D2–, D2+, D1–, D1+) | Remote thermal diode interfaces | Supports two external diode-connected transistors (e.g., 2N3906) for CPU/chipset 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 processor core rails |
| 24 (PWM1/XTO) | PWM fan output / XOR test output | Primary fan control channel; doubles as XOR tree output during diagnostic test mode |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Fan Speed Control Loop | Self-contained PID-like algorithm adjusts PWM duty cycle per fan based on real-time temperature readings without CPU intervention |
| Enhanced Acoustic Mode | Programmable slew rate and step size control minimizes audible fan speed transitions in quiet environments |
| Multi-Rail Voltage Monitoring | Simultaneous measurement of 12 V, 5 V, 2.5 V, VCCP, and VCC with ±1.5% total unadjusted error on 12 V input |
| Dual Remote Diode Sensing | Independent D1+/– and D2+/– channels with 0.25 °C resolution and ±1 °C accuracy at 40 °C enable dual-die thermal mapping |
| SMBus Address Flexibility | Three hardwired SMBus addresses (0x58, 0x5A, 0x5C) selectable via Pin 13/14 strapping - avoids bus conflicts in multi-controller systems |
| Voltage ID (VID) Monitoring | Five-bit VID input (VID0–VID4) captures processor VRM9.x/VRM10 voltage codes for dynamic VCCP regulation validation |
Applications
| Low-Acoustic-Noise Desktop PCs | Network Switches and Routers |
|---|---|
Use Scenario: Maintaining thermal safety in office/desktop environments where fan noise must remain below 28 dB(A). IC Role / Device Role / Timing Role: Central thermal manager coordinating CPU, chipset, and power stage temperatures while dynamically adjusting four fan speeds. Use Value: Enables fan speeds to drop to <1,000 RPM under light load via programmable TMIN and TRANGE registers, reducing acoustic output without compromising thermal margin. |
Use Scenario: Sustaining uptime in carrier-grade Ethernet switches operating 24/7 in temperature-controlled datacom cabinets. IC Role / Device Role / Timing Role: Real-time voltage supervisor and thermal watchdog for ASICs, PHYs, and DC/DC converters across multiple board zones. Use Value: Detects overvoltage on 12 V backplane rails and triggers SMBALERT within 129.78 ms full-cycle monitoring time to initiate graceful shutdown. |
| Telecom Base Station Power Modules | Industrial Embedded Controllers |
Use Scenario: Managing heat dissipation in compact RF power amplifier modules with limited airflow and high ambient temperatures. IC Role / Device Role / Timing Role: Dual-diode temperature monitor for PA die and heatsink, coupled with VCCP and 5 V rail supervision. Use Value: Achieves ±1 °C remote diode accuracy at 105 °C junction temperature, enabling safe derating of RF output power before thermal throttling. |
Use Scenario: Ensuring long-term reliability of fan-cooled PLCs deployed in factory-floor enclosures with dust and vibration exposure. IC Role / Device Role / Timing Role: Fault-tolerant system monitor providing redundant temperature and voltage validation independent of host MCU. Use Value: Uses open-drain SMBALERT output to assert hardware interrupt on any limit violation, bypassing software polling delays for fail-safe response. |
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 |
|---|---|---|---|
| LM95234CIMTX/NOPB | Four remote diode inputs vs. ADM1027ARQZ-REEL's two; no integrated fan PWM outputs; SPI-only interface | Used in multi-processor servers requiring die-level thermal mapping but relying on separate fan controllers | Select when higher remote sensor count is critical and fan control is handled externally |
| MAX6657AESA+ | Single remote diode input; no VID monitoring; only two voltage inputs (VCC, VCCP); SMBus-compatible but no acoustic enhancement registers | Deployed in cost-sensitive embedded designs where basic thermal alerting suffices without fan speed optimization | Select for minimal-feature thermal monitoring where PCB space and BOM cost outweigh advanced fan control needs |
Compared with LM95234CIMTX/NOPB and MAX6657AESA+, the ADM1027ARQZ-REEL uniquely combines dual remote diode sensing, five-rail voltage monitoring, four-fan tachometry, and three programmable PWM outputs in a single SMBus device - making it optimal for integrated thermal-noise co-design in space-constrained platforms.
Availability
ADM1027ARQZ-REEL is available at Aetrix Electronics and suitable for low-acoustic-noise PCs, networking switches, telecom base station power modules, and industrial embedded controllers requiring stable component supply across extended production lifecycles.
Supply support for ADM1027ARQZ-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, Inc. 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 ADM1027ARQZ-REEL belongs to Analog Devices' dBCOOL™ family of thermal management ICs, engineered specifically for acoustic-aware active cooling in desktop, server, and telecom infrastructure where fan noise and thermal reliability are co-optimized.
FAQ
What is the default SMBus address of the ADM1027ARQZ-REEL and how is it configured?
The ADM1027ARQZ-REEL defaults to SMBus address 0x5C when Pin 13 (PWM3/ADDR_EN) is pulled high at power-up. To select alternate addresses (0x58 or 0x5A), Pin 13 must be strapped low, and Pin 14 (TACH4/ADDR_SELECT) set to low or high respectively. This address is latched on the first valid SMBus transaction and remains fixed until reset. The ADM1027ARQZ-REEL requires explicit strapping - floating Pin 13 causes unpredictable addressing behavior.
Does the ADM1027ARQZ-REEL support both 3.3 V and 5 V supply operation, and how is voltage scaling handled?
Yes, the ADM1027ARQZ-REEL operates from 3.0 V to 5.5 V and can monitor its own supply rail (VCC) whether powered from 3.3 V standby or 5 V main. When VCC = 5 V, Bit 7 of Configuration Register 0x40 must be set to rescale internal attenuators for accurate 5 V measurement. The ADM1027ARQZ-REEL's analog front-end maintains ±1.5% TUE on the 12 V input regardless of VCC level, ensuring consistent rail monitoring across supply configurations.
How does the ADM1027ARQZ-REEL achieve enhanced acoustic performance in fan control?
The ADM1027ARQZ-REEL implements Enhanced Acoustic Mode through dedicated registers that constrain PWM duty-cycle step size and slew rate during fan speed transitions. This prevents abrupt changes in fan velocity that generate tonal noise, especially below 3,000 RPM. The ADM1027ARQZ-REEL applies these constraints independently per PWM output (PWM1–PWM3), allowing fine-grained tuning for different fan types and mechanical mounting conditions.
Can the ADM1027ARQZ-REEL monitor processor core voltage (VCCP) and decode VRM voltage ID codes simultaneously?
Yes. The ADM1027ARQZ-REEL monitors VCCP on Pin 23 (0–3 V range) with ±1.5% TUE and reads five-bit VID codes (VID0–VID4 on Pins 5–8 and 19) into the VID Register (0x43). This dual capability allows real-time correlation between commanded core voltage (from VID) and actual delivered voltage (from VCCP measurement), supporting VRM9.x and VRM10 compliance verification. The ADM1027ARQZ-REEL performs both functions concurrently without resource contention.
What is the maximum remote temperature sensing accuracy of the ADM1027ARQZ-REEL and under what conditions is it specified?
The ADM1027ARQZ-REEL achieves ±1 °C remote diode temperature accuracy when both remote diode temperature (TD) and ambient temperature (TA) are at 40 °C, with 0.25 °C resolution. This specification holds across the full remote sensing range of 0 °C to 120 °C and is validated with typical leakage resistance (<1 MΩ) and D+/D− capacitance (<10 nF). The ADM1027ARQZ-REEL's accuracy degrades to ±3 °C over the full 0 °C–120 °C range under worst-case conditions.
ADM1027ARQZ-REEL 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
ADM1027ARQZ-REEL FAQ
1.How can I place an order for ADM1027ARQZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM1027ARQZ-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 ADM1027ARQZ-REEL reliable?
The price and inventory of ADM1027ARQZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM1027ARQZ-REEL is usually 5 days.
3.What payment methods are accepted for ADM1027ARQZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM1027ARQZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM1027ARQZ-REEL?
ADM1027ARQZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM1027ARQZ-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 ADM1027ARQZ-REEL?
For technical support, including ADM1027ARQZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM1027ARQZ-REEL requirements.
6.How does Aetrix verify that ADM1027ARQZ-REEL is sourced from the original manufacturer or authorized distributors?
All ADM1027ARQZ-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 ADM1027ARQZ-REEL meets industry standards.
7.What is the process for return or replacement of ADM1027ARQZ-REEL?
All ADM1027ARQZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM1027ARQZ-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 ADM1027ARQZ-REEL part is unused and in its original packaging.
Return procedure for ADM1027ARQZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADM1027ARQZ-REEL Tags
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