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Analog Devices Inc. ADM1029ARQ
- Part No.:
- ADM1029ARQ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Thermal Management
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ADM1029ARQ.pdf
- Description:
- DUAL PWM FAN CONTROLLER
- Quantity:
- Payment:
- Shipping:
Inventory:182
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Product details
Overview
ADM1029ARQ from Analog Devices is a dual PWM fan controller and temperature monitor IC designed for high-availability systems. It provides local and remote (dual diode) temperature sensing with ±1°C internal and ±3°C external accuracy, dual tachometer-based RPM measurement (±6% error), and two open-drain PWM drive outputs for fan speed control - used in network servers and telecom equipment requiring thermal management redundancy.
For engineers reviewing the ADM1029ARQ datasheet, ADM1029ARQ pinout, ADM1029ARQ application, or ADM1029ARQ equivalent, key selection criteria include its 24-lead QSOP package, SMBus-compatible serial interface, automatic hardware-based fan control loop, hot-swap support, and cascadable CFAULT signaling for multi-device fault propagation.
Technical Context
The ADM1029ARQ integrates a bandgap-based local temperature sensor and dual remote diode interfaces (D1+/D1−, D2+/D2−) with chopper-stabilized ∆VBE measurement architecture, enabling accurate remote sensing without device-specific calibration. Its ADC delivers 1°C resolution and supports offset correction via dedicated registers (0x30–0x32).
It implements two independent PWM controllers driving FAN1/FAN2, each with programmable min/max speed, alarm thresholds, and hot-plug speed registers. Fan status is monitored via open-drain TACH1/TACH2 inputs (2-pulse/rev counting), PRESENT1/PRESENT2 detection, and FAULT1/FAULT2 I/Os - all coordinated through interrupt (INT) and cascaded fault (CFAULT) outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0 V to 5.5 V - compatible with both 3.3 V and 5 V system rails, with internal bypassing guidance (10 µF + 0.1 µF) |
| Temperature Sensing Accuracy | ±1°C (local), ±3°C (remote, 0°C–100°C) - enables precise thermal throttling in server chassis |
| Fan Speed Measurement Error | ±6% at 60°C–100°C - validated for reliable RPM feedback under operational thermal stress |
| SMBus Interface Speed | 10 kHz to 100 kHz - supports standard and fast-mode SMBus timing with glitch immunity ≥50 ns |
| Package Type | 24-lead QSOP (RQ-24) - surface-mount, 0.15 mm pitch, θJA = 105°C/W for thermal-aware PCB layout |
| Operating Temperature Range | 0°C to 100°C - specified for industrial-grade server and telecom ambient conditions |
| Shutdown Current | 10 µA typical - enables low-power thermal monitoring during standby or maintenance modes |
Pinout & Package
ADM1029ARQ is housed in a 24-lead Shrink Small Outline Package (QSOP, RQ-24), measuring 8.7 mm × 3.9 mm × 1.5 mm, with gull-wing leads and 0.635 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 24 | DRIVE1 / DRIVE2 | Open-drain PWM outputs - require 10 kΩ pull-up; directly drive fan speed control MOSFETs or PWM-input fans |
| 3, 22 | TACH1 / TACH2 | Open-drain tachometer inputs - accept 5 V logic signals regardless of VCC level (3.3 V or 5 V) |
| 4, 21 | PRESENT1 / PRESENT2 | Open-drain presence detection - pulled low by shorting link in fan connector to confirm physical installation |
| 2, 23 | FAULT1 / FAULT2 | Open-drain fault I/O - bidirectional; asserts low on fan failure or reports fault from fan's dedicated output |
| 13–14, 16–17 | D1−/D1+, D2−/D2+ | Analog remote diode inputs - support NPN/PNP transistors or microprocessor substrate diodes; bias current 90 µA (high), 5.5 µA (low) |
| 15 | ADD | 8-level analog address input - sets 3 LSBs of SMBus address (0101xxx) at power-up only; enables up to eight devices on one bus |
| 18 | TMIN/INSTALL | 8-level analog configuration input - defines minimum activation temperature, automatic control enable, and installed fan count (1 or 2) |
| 5, 6 | SCL / SDA | SMBus interface - open-drain clock/data lines requiring 2.2 kΩ pull-ups; compliant with System Management Bus v1.1 |
| 9 | CFAULT | Cascadable open-drain fault output - wire-OR'd across multiple ADM1029ARQs to propagate faults without host polling |
| 10 | INT | Interrupt request output - active-low, SMBus Alert Response Address (ARA) capable for rapid fault source identification |
Key Features
| Feature | Design Value |
|---|---|
| Hardware-based automatic fan control | Self-contained PID-like loop runs independently after initial setup - eliminates CPU polling overhead and reduces software complexity |
| Dual remote diode sensing with digital filtering | Averages 16 measurement cycles per reading - suppresses noise from switching power supplies and high-speed digital circuits |
| Cascadable CFAULT signaling | Enables daisy-chained fault reporting across up to eight ADM1029ARQs - simplifies fault isolation in multi-blade chassis |
| Hot-swap fan support | Detects fan insertion/removal via PRESENT pins and reinitializes PWM control - maintains thermal stability during live maintenance |
| Configurable SMBus address (0101xxx) | Single ADD pin accepts 8 voltage levels - eliminates need for multiple address-select resistors or jumpers per device |
Applications
| Network Server Thermal Management | Telecom Shelf Cooling Control |
|---|---|
Use Scenario: Real-time monitoring and dynamic speed adjustment of redundant cooling fans in 1U/2U rack-mounted servers. IC Role / Device Role / Timing Role: Dual PWM controller and dual-diode temperature monitor - manages fan response to CPU/GPU die temperature and ambient inlet air temperature. Use Value: Reduces acoustic noise by 8–12 dB(A) and cuts fan power consumption up to 40% versus fixed-speed operation, while maintaining <±2°C thermal margin. |
Use Scenario: Fault-tolerant thermal supervision of line cards and power modules in carrier-grade telecom shelves with forced-air cooling. IC Role / Device Role / Timing Role: Dual-fan controller with cascaded CFAULT and SMBus ARA - coordinates cooling across distributed shelf units and enables rapid fault root-cause analysis. Use Value: Enables zero-downtime fan replacement via hot-swap detection and automatic backup fan activation within 200 ms of primary fan failure. |
| PC-Based Industrial Controller | High-Availability Storage Enclosure |
Use Scenario: Compact thermal regulation in fan-cooled embedded PCs used in factory automation or medical imaging systems. IC Role / Device Role / Timing Role: Local + remote temperature monitor with GPIO-reconfigurable analog inputs (AIN0/GPIO0, AIN1/GPIO1) - measures processor junction and enclosure ambient simultaneously. Use Value: Eliminates need for external ADC or discrete temperature sensors; reduces BOM count by 3 components and saves >12 mm² PCB area. |
Use Scenario: Redundant fan control and temperature mapping across multi-bay JBOD or NAS enclosures with mixed drive types (HDD/SSD). IC Role / Device Role / Timing Role: Dual tachometer counter and dual fault I/O - monitors rotational integrity and electrical health of front/rear fans while detecting drive bay airflow blockage. Use Value: Prevents thermal runaway during sequential drive spin-up by ramping fan speed based on real-time remote diode readings from drive trays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-fan controller and temperature monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM96163CIMT/NOPB | Single remote diode channel; no cascaded fault output; 16-lead TSSOP package | Lacks CFAULT signaling and second remote sensor - unsuitable for multi-device fault propagation or dual-zone thermal control | Choose when only one remote sensor is needed and board space is constrained; not drop-in compatible due to pin count and feature set |
| MAX6657MUA+ | Single PWM output; no tachometer inputs; uses 2-wire SMBus (no ARA support); 8-lead µMAX | No fan speed feedback or fault coordination - limited to basic thermal throttling without closed-loop RPM control | Select for cost-sensitive, single-fan applications where fan health monitoring is not required; requires redesign of fan interface circuitry |
Compared with LM96163CIMT/NOPB and MAX6657MUA+, the ADM1029ARQ uniquely delivers dual independent PWM control, dual tachometer feedback, cascaded fault signaling, and dual remote diode sensing in a single 24-pin QSOP - making it the only option supporting full redundancy, hot-swap, and multi-device thermal coordination in high-availability systems.
Availability
ADM1029ARQ is available at Aetrix Electronics and suitable for network servers, telecom equipment, and industrial embedded controllers requiring stable component supply across extended product lifecycles and volume production ramps.
Supply support for ADM1029ARQ 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, headquartered in Norwood, MA, with design centers worldwide and ISO 9001-certified manufacturing.
The ADM1029ARQ belongs to Analog Devices' thermal management and system monitoring IC product line, engineered specifically for high-availability computing infrastructure where reliability, redundancy, and autonomous thermal control are critical.
FAQ
What is the operating temperature range specified for the ADM1029ARQ?
The ADM1029ARQ is rated for operation from 0°C to 100°C ambient temperature, matching its "0°C to 100°C" ordering suffix. This range applies to all specifications including temperature sensing accuracy (±3°C for remote diode), fan speed measurement (±6% error), and SMBus timing compliance. The device's absolute maximum junction temperature is 150°C, and thermal characteristics (θJA = 105°C/W) are defined for the 24-lead QSOP package under standard JEDEC conditions.
Does the ADM1029ARQ support hot-swap detection for cooling fans?
Yes, the ADM1029ARQ supports hot-swap detection via its PRESENT1 (Pin 4) and PRESENT2 (Pin 21) inputs. Each is an open-drain digital input that reads low when a shorting link in the fan connector grounds the pin - confirming physical fan installation. The device detects insertion/removal events in real time and can reinitialize PWM control or activate backup fans without host intervention, enabling live fan replacement in systems like telecom shelves and server blades.
How does the ADM1029ARQ achieve accurate remote temperature measurement without calibration?
The ADM1029ARQ uses a ratiometric ∆VBE technique: it alternately biases the remote diode (or diode-connected transistor) at two different currents (I and N×I) and measures the resulting voltage difference. This method cancels out process-dependent VBE offsets and yields temperature proportional to ln(N)×T, eliminating the need for per-device calibration. Internal digital filtering averages 16 measurements to suppress noise, delivering ±3°C accuracy over 0°C–100°C with 1°C resolution.
Can the ADM1029ARQ control more than two fans?
No, the ADM1029ARQ natively controls exactly two fans via DRIVE1 and DRIVE2 PWM outputs and monitors them via TACH1/TACH2, FAULT1/FAULT2, and PRESENT1/PRESENT2. However, up to eight ADM1029ARQ devices can share one SMBus segment (using unique addresses set by the ADD pin), enabling coordinated control of up to 16 fans in large systems. Cascaded CFAULT signaling allows fault propagation across this multi-device network without additional wiring.
What SMBus features does the ADM1029ARQ implement beyond basic read/write?
The ADM1029ARQ implements SMBus Alert Response Address (ARA), allowing the host to identify which device asserted INT by sending a general call (0001100); the interrupting ADM1029ARQ responds with its slave address. It also supports block read/write (via Address Pointer Register auto-increment), interrupt masking, and configurable fault action registers (0x40–0x42). These features reduce host polling overhead and enable deterministic fault handling in multi-device thermal management systems.
ADM1029ARQ 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 ~ 100°C, External Sensor
- Accuracy:
- ±1°C Local, ±3°C Remote
- Topology:
- ADC, Fan Control, Multiplexer, Register Bank
- Output Type:
- Open Drain
- 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:
- 24-QSOP
ADM1029ARQ FAQ
1.How can I place an order for ADM1029ARQ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM1029ARQ 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 ADM1029ARQ reliable?
The price and inventory of ADM1029ARQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM1029ARQ is usually 5 days.
3.What payment methods are accepted for ADM1029ARQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM1029ARQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM1029ARQ?
ADM1029ARQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM1029ARQ 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 ADM1029ARQ?
For technical support, including ADM1029ARQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM1029ARQ requirements.
6.How does Aetrix verify that ADM1029ARQ is sourced from the original manufacturer or authorized distributors?
All ADM1029ARQ 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 ADM1029ARQ meets industry standards.
7.What is the process for return or replacement of ADM1029ARQ?
All ADM1029ARQ units undergo pre-shipment inspection (PSI). If there is an issue with ADM1029ARQ, 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 ADM1029ARQ part is unused and in its original packaging.
Return procedure for ADM1029ARQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADM1029ARQ Tags
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