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Analog Devices Inc. ADM1027ARQZ
- Part No.:
- ADM1027ARQZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Thermal Management
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ADM1027ARQZ.pdf
- Description:
- DBCOOL REMOTE THERMAL CONTROLLER
- Quantity:
- Payment:
- Shipping:
Inventory:2,759
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Product details
Overview
ADM1027ARQZ 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, controls four PWM fan outputs, and supports SMBus 2.0 for system-level thermal regulation in desktop PCs and telecom equipment.
For engineers reviewing the ADM1027ARQZ datasheet, ADM1027ARQZ pinout, ADM1027ARQZ application, or ADM1027ARQZ equivalent, key selection criteria include its dual remote diode sensing capability, automatic fan speed control loop with TRANGE/TMIN programmability, enhanced acoustic mode for reduced fan noise perception, 24-pin QSOP package compatibility, and VID0–VID4 monitoring for VRM9.x-compliant CPU voltage ID decoding.
Technical Context
The ADM1027ARQZ integrates a 10-bit ADC with analog multiplexer and signal conditioning for six analog inputs (four voltage rails + two temperature diode channels), plus an on-chip band gap sensor. Its serial bus interface implements full SMBus 2.0 electrical compliance-including glitch immunity, timeout detection (15–35 ms), and Alert Response Address (ARA) support-with configurable slave addressing via pins 13/14.
It features three dedicated open-drain PWM outputs (PWM1–PWM3) with 8.0 mA sink capability and reconfigurable functionality: PWM2 doubles as SMBALERT interrupt output, while PWM3/ADDR_EN and TACH4/ADDR_SELECT enable hardware address selection (0x58h/0x5Ah/0x5Ch). Fan tachometer inputs (TACH1–TACH4) support both 2-wire and 3-wire measurement with ±6% RPM accuracy.
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; bit 7 of Config Register 0x40 rescales attenuators for accurate 5 V monitoring. |
| Temperature Sensing Accuracy | ±1 °C at TA = 40 °C - Enables precise thermal throttling decisions for CPU and chipset without software compensation. |
| Fan Speed Control Outputs | 3 PWM outputs (PWM1–PWM3) - Drive fans directly with 10 kΩ pull-up; PWM2 configurable as SMBALERT interrupt output. |
| Remote Diode Support | 2 independent D1+/D1− and D2+/D2− channels - Interfaces with CPU thermal diodes or discrete transistors (e.g., 2N3906) for board- and die-level temperature tracking. |
| SMBus Compliance | Fully SMBus 2.0 electrical spec compliant - Ensures interoperability with host controllers without level-shifting or protocol translation. |
| VID Monitoring | 5-bit VID0–VID4 inputs - Reads VRM9.x-compliant processor voltage ID codes into register 0x43 for dynamic core voltage validation. |
| Package | 24-lead QSOP (RQ-24) - Surface-mount footprint with θJA = 123 °C/W; compatible with standard reflow profiles and automated assembly. |
Pinout & Package
ADM1027ARQZ is housed in a 24-lead QSOP (RQ-24) package with 0.15 mm lead pitch and exposed pad not electrically connected. Pin functions are validated per Analog Devices' official datasheet Rev. 0, including dual-role pins for SMBus address configuration and fan/PWM flexibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SDA) | SMBus bidirectional data I/O | Open-drain serial data line requiring external pull-up; supports Send Byte, Write Byte, and Read Byte protocols. |
| 2 (SCL) | SMBus clock input | Open-drain clock input with 50 ns glitch immunity; defines timing for all register read/write operations. |
| 4 (VCC) | Main power supply input | Supplies internal circuitry and is itself monitored; accepts 3.3 V or 5 V with register-configurable scaling. |
| 5–8, 19 (VID0–VID4) | Digital voltage ID inputs | Read CPU VRM9.x VID code bits into register 0x43 for real-time core voltage verification. |
| 9, 11–12, 14 (TACH1–TACH4) | Fan tachometer inputs | Open-drain digital inputs supporting 2-wire (reconfigurable as AIN1–AIN4) or 3-wire fan speed measurement. |
| 10 (PWM2/SMBALERT) | Configurable output | Either PWM fan control output or SMBALERT interrupt signal-selected via configuration register. |
| 13 (PWM3/ADDR_EN) | Address enable control | Pulled low at power-up to enter Address Select Mode; otherwise defaults to SMBus address 0x5Ch. |
| 15–18 (D1−, D1+, D2−, D2+) | Remote diode interfaces | Differential pairs for connecting external thermal diodes; support current-source-based remote sensing. |
| 20–23 (5VIN, 12VIN, 2.5VIN, VCCP) | Analog voltage monitor inputs | Attenuated inputs calibrated for 5 V, 12 V, 2.5 V, and 0–3 V core voltage ranges respectively. |
| 24 (PWM1/XTO) | PWM fan output / test mode | Primary fan control output; also serves as XOR tree output during XOR Test Mode diagnostics. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Fan Speed Control Loop | Programmable TMIN and TRANGE registers enable closed-loop thermal management without CPU intervention-fan speed adjusts dynamically based on measured temperature gradients. |
| Enhanced Acoustic Mode | Registers tweak PWM frequency and slew rate to minimize audible fan speed transitions-critical for low-noise PC and workstation applications. |
| Dual Remote Diode Sensing | Independent D1+/D1− and D2+/D2− channels allow simultaneous monitoring of CPU die and motherboard ambient or chipset temperature-enabling multi-zone thermal policy enforcement. |
| SMBus Address Flexibility | Hardware-selectable addresses (0x58h/0x5Ah/0x5Ch) via pins 13/14 eliminate bus conflicts in multi-controller systems-no firmware reconfiguration required. |
| Voltage Monitoring Coverage | Five rail inputs (12 V, 5 V, 2.5 V, VCCP, VCC) with ±1.5% total unadjusted error on 12 V channel-supports comprehensive power integrity validation across ATX and server platforms. |
Applications
| Desktop PC Thermal Management | Network Equipment Cooling Control |
|---|---|
Use Scenario: Real-time monitoring of CPU core voltage (VCCP), 12 V/5 V rails, and CPU die temperature in high-performance desktop motherboards. IC Role / Device Role / Timing Role: Central thermal supervisor that reads VID bits, samples remote diode temperature, and adjusts four PWM fan speeds via SMBus-hosted control loop. Use Value: Enables silent operation under light load and responsive cooling during burst workloads-meeting acoustic targets below 25 dBA without sacrificing thermal safety margins. |
Use Scenario: Active cooling coordination across multiple hot-swappable line cards in telecom chassis with varying thermal loads. IC Role / Device Role / Timing Role: Local thermal manager per card, interfacing with CPU diode and local ambient sensor to drive card-specific fans while reporting status via shared SMBus. Use Value: Prevents localized overheating in dense 1U/2U enclosures by enabling per-module fan control-reducing overall system airflow requirements and power consumption. |
| Server Blade Temperature Regulation | Industrial Embedded Controller Monitoring |
Use Scenario: Monitoring processor junction temperature and 2.5 V chipset rail in space-constrained blade servers where thermal headroom is limited. IC Role / Device Role / Timing Role: Dual-diode temperature sensor and voltage monitor feeding thermal policy engine; PWM outputs drive compact axial fans mounted directly on heatsinks. Use Value: Achieves ±1 °C thermal accuracy at 40 °C ambient-supporting predictive thermal throttling before critical thresholds are breached. |
Use Scenario: Long-life embedded systems requiring reliable thermal supervision over 10+ year lifecycles, such as medical imaging or test equipment. IC Role / Device Role / Timing Role: Standalone thermal guard IC with non-volatile limit registers and SMBALERT interrupt-operates independently of host processor boot state. Use Value: Provides fail-safe thermal shutdown signaling even during BIOS initialization or host firmware failure-ensuring hardware-level protection. |
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 |
|---|---|---|---|
| ADM1030ARQZ | Single remote diode channel (vs. two); no VID monitoring; lower fan count (3 vs. 4); identical QSOP-24 package. | Lacks CPU die + chipset dual-zone sensing; unsuitable for VRM9.x VID validation workflows. | Select when only one remote sensor and simplified VID-free monitoring is sufficient-reduces BOM cost and layout complexity. |
| LM95234CIMTX/NOPB | Two remote diodes + local sensor; no voltage monitoring; no PWM outputs; uses SMBus but lacks automatic fan control logic. | Requires external fan drivers and host-based control algorithms-adds software overhead and latency. | Choose when thermal-only sensing suffices and fan actuation is handled elsewhere-ideal for hybrid thermal/power management architectures. |
Compared with ADM1027ARQZ, ADM1030ARQZ reduces thermal visibility and eliminates CPU voltage ID support, while LM95234CIMTX/NOPB provides equivalent remote sensing but shifts fan control responsibility to the host-making ADM1027ARQZ uniquely suited for autonomous, integrated thermal management in resource-constrained systems.
Availability
ADM1027ARQZ is available at Aetrix Electronics and suitable for desktop PC motherboard design, telecom equipment thermal management, server blade cooling, industrial embedded controller monitoring, and low-acoustic-noise computing applications requiring stable component supply across extended production cycles.
Supply support for ADM1027ARQZ 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 and manufacturing expertise spanning precision sensing, power management, and connectivity.
The ADM1027ARQZ belongs to Analog Devices' dBCOOL™ family of thermal management ICs, engineered specifically for autonomous, low-noise system cooling in PCs, networking gear, and embedded platforms where acoustic performance and thermal reliability are co-primary requirements.
FAQ
What is the primary function of the ADM1027ARQZ in a system?
The ADM1027ARQZ serves as an integrated thermal and power supervisor IC. It monitors up to five voltage rails (12 V, 5 V, 2.5 V, VCCP, VCC), measures local and two remote diode temperatures, reads 5-bit CPU VID codes, and controls four PWM fan outputs-all via SMBus. Its core function is autonomous, closed-loop fan speed regulation based on real-time thermal data, reducing acoustic noise while maintaining safe operating temperatures. The ADM1027ARQZ enables this without continuous CPU involvement once configured.
Does the ADM1027ARQZ support both 3.3 V and 5 V supply operation?
Yes, the ADM1027ARQZ operates from 3.0 V to 5.5 V and can be powered from either a 3.3 V standby rail or a 5 V main supply. When using 5 V, Bit 7 of Configuration Register 0x40 must be set to rescale the internal attenuators for accurate VCC measurement. This dual-supply flexibility allows the ADM1027ARQZ to remain active during low-power states and maintain monitoring continuity across system power modes.
How does the ADM1027ARQZ implement automatic fan speed control?
The ADM1027ARQZ implements automatic fan speed control through programmable TMIN (starting temperature) and TRANGE (temperature-to-speed slope) registers. Once configured, it continuously compares measured temperature against these values and adjusts PWM duty cycle accordingly-without CPU polling or intervention. The ADM1027ARQZ supports separate TMIN/TRANGE settings per PWM output, enabling zone-specific cooling policies. This closed-loop behavior is enabled by default after power-up and persists across SMBus idle periods.
Can the ADM1027ARQZ monitor CPU core voltage accurately?
Yes, the ADM1027ARQZ monitors CPU core voltage (VCCP) via Pin 23, which is calibrated for 0–3 V input with ±1.5% total unadjusted error. It also reads the processor's 5-bit VID code (via Pins 5–8 and 19) into Register 0x43, allowing the host system to cross-validate actual VCCP against expected VRM9.x target voltage. This dual-path verification ensures robust core voltage supervision-critical for stability in overclocked or thermally throttled conditions. The ADM1027ARQZ delivers this capability within its single 24-pin QSOP package.
What SMBus address options does the ADM1027ARQZ support?
The ADM1027ARQZ supports three hardware-configurable SMBus addresses: 0x58h, 0x5Ah, and 0x5Ch. Address selection is determined at power-up by the logic state of Pin 13 (PWM3/ADDR_EN) and Pin 14 (TACH4/ADDR_SELECT). If Pin 13 is high, it defaults to 0x5Ch. If Pin 13 is pulled low, Pin 14 sets the address to 0x58h (low) or 0x5Ah (high). This eliminates bus conflicts in multi-ADM1027ARQZ systems and requires no firmware changes-address is latched on first valid SMBus transaction.
ADM1027ARQZ 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 FAQ
1.How can I place an order for ADM1027ARQZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM1027ARQZ 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 reliable?
The price and inventory of ADM1027ARQZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM1027ARQZ is usually 5 days.
3.What payment methods are accepted for ADM1027ARQZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM1027ARQZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM1027ARQZ?
ADM1027ARQZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM1027ARQZ 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?
For technical support, including ADM1027ARQZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM1027ARQZ requirements.
6.How does Aetrix verify that ADM1027ARQZ is sourced from the original manufacturer or authorized distributors?
All ADM1027ARQZ 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 meets industry standards.
7.What is the process for return or replacement of ADM1027ARQZ?
All ADM1027ARQZ units undergo pre-shipment inspection (PSI). If there is an issue with ADM1027ARQZ, 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 part is unused and in its original packaging.
Return procedure for ADM1027ARQZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADM1027ARQZ Tags
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