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Analog Devices Inc. ADM1022ARQ-REEL
- Part No.:
- ADM1022ARQ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Sensor and Detector Interfaces
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ADM1022ARQ-REEL.pdf
- Description:
- LOW-COST PC TEMPERATURE MONITOR
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
ADM1022ARQ-REEL from Analog Devices is a low-cost PC temperature monitor and fan controller ASIC with dual remote diode sensing (D1+/D1–, D2+/D2–), on-chip bandgap temperature sensor, 8-bit DAC for analog fan speed control (0–2.5 V), SMBus interface, and dual supply voltage monitors (VCC, VMON) for brownout detection - used in microprocessor-based servers and office equipment for hardware thermal protection.
For engineers reviewing the ADM1022ARQ-REEL datasheet, ADM1022ARQ-REEL pinout, ADM1022ARQ-REEL application, or ADM1022ARQ-REEL equivalent, key selection considerations include remote diode accuracy (±5°C), SMBus timing compliance (400 kHz), open-drain interrupt/reset outputs (INT, RST1, RST2), fan-off request capability (FAN_OFF), and dual-channel thermal monitoring for single/dual-CPU systems.
Technical Context
The ADM1022ARQ-REEL integrates two independent temperature measurement channels: one dedicated (D1+/D1–) and one reconfigurable (D2+/D2– as diode input or THERM/GPI), each using switched-current ΔVBE sensing with 1°C resolution and 16-cycle digital averaging. Its internal 8-bit DAC drives FAN_SPD with 0–2.5 V output and ±5% total unadjusted error at 2 mA load.
It implements dual independent reset generators: RST1 triggered by VCC falling below 2.925 V (50 mV hysteresis), and RST2 responsive to VMON, MR, or RST1 assertion, with programmable 140–560 ms timeout. All digital I/Os (SCL, SDA, INT, RST1/RST2, FAN_OFF) are open-drain with VIH ≥ 2.1 V and VOL ≤ 0.4 V at –3.0 mA.
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 or 5 V system rails without level-shifting. |
| Internal Temp Accuracy | ±3°C - enables reliable ambient temperature monitoring without external calibration. |
| Remote Diode Accuracy | ±5°C - sufficient for CPU/die temperature tracking in PCs and servers per Intel Pentium III validation. |
| SMBus Clock Frequency | 400 kHz - compliant with standard System Management Bus timing for PIIX4 and compatible host controllers. |
| Fan Control Output | 0–2.5 V analog (8-bit DAC) - directly interfaces with op-amp/MOSFET fan drive circuits (e.g., Fig. 5c) for linear speed regulation. |
| Reset Timeout Range | 140–560 ms - configurable via internal registers to match system power-up sequencing requirements. |
| Supply Current (Typ) | 2.6 mA - enables low-power thermal monitoring during active system operation. |
Pinout & Package
ADM1022ARQ-REEL is housed in a 16-lead QSOP package (RQ-16), 3.9 mm × 4.9 mm body, 1.0 mm max height, 0.65 mm lead pitch, with exposed pad not present. Pin 1 is FAN_OFF; pin 16 is SDA. All digital I/Os are open-drain; analog inputs (D1±, D2±/THERM, VMON) require layout attention per AN-678.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FAN_OFF (1) | Digital output (open-drain) | Hardware fan disable signal - asserts low to force fan shutdown regardless of FAN_SPD DAC value. |
| MR (2) | Digital input (with 20 kΩ pull-up) | Manual reset trigger - initiates RST2 assertion for tRP; no external pull-up required. |
| RST1 (3) | Digital I/O (open-drain, bidirectional) | Primary reset output tied to VCC brownout; can be driven externally to reset ADM1022 itself. |
| GND (4) | Power and signal reference | Common ground for analog measurements, SMBus, and reset logic - must be low-impedance. |
| VCC (5) | Power supply and monitor input | Main supply rail (3.0–5.5 V); also input to first reset generator with 2.925 V threshold. |
| VMON (6) | Analog input | Second supply monitor input - triggers RST2 if voltage falls below programmable threshold. |
| RST2 (7) | Digital output (open-drain) | OR-combined reset output - asserted on VMON/VCC brownout, MR low, or RST1 active. |
| FAN_SPD/NTEST_IN (8) | Analog output / test input | 8-bit DAC output (0–2.5 V) for fan control; high-level input enables NAND board-level test mode. |
| D1– (9) | Remote diode negative input | Current sink node for primary external diode sensor - biased above GND by internal diode. |
| D1+ (10) | Remote diode positive input | Current source node for primary external diode sensor - forms complete ΔVBE measurement path. |
| D2–/THERM (11) | Reconfigurable I/O | When configured as THERM: active-low over-temp interrupt; when as D2–: secondary diode current sink. |
| D2+/GPI (12) | Reconfigurable I/O | When configured as GPI: programmable active-high/low logic input setting Status Bit 4; when as D2+: secondary diode current source. |
| ADD/NTEST_OUT (13) | Address select / test output | Three-state input sets LSBs of SMBus address (01011xx); outputs test signal during NAND testing. |
| INT (14) | Digital output (open-drain) | System interrupt signal - asserted when any temperature/voltage limit violation occurs (maskable). |
| SCL (15) | SMBus clock input | Asynchronous serial clock - accepts 400 kHz max frequency with 50 ns glitch immunity. |
| SDA (16) | SMBus bidirectional data | Open-drain data line - requires external pull-up; supports read/write protocols per SMBus spec. |
Key Features
| Feature | Design Value |
|---|---|
| Dual remote diode sensing | Supports simultaneous monitoring of two CPUs or GPU + CPU via D1± and reconfigurable D2± pins. |
| On-chip temperature sensor | Bandgap-based internal sensor provides ambient temperature reading without external components. |
| Fault-tolerant fan control | Automatic full-speed fan activation on over-temperature trip - prevents thermal runaway without software intervention. |
| Two independent reset generators | RST1 for VCC brownout only; RST2 for combined VMON/VCC/MR/RST1 events - enables layered system reset architecture. |
| LDCM support | Compatible with Legacy Device Configuration Manager for BIOS-level thermal policy enforcement in x86 platforms. |
Applications
| Server CPU Thermal Monitoring | Desktop PC Power Supply Health |
|---|---|
Use Scenario: Real-time die temperature tracking of dual Xeon processors in 1U rack servers using substrate transistors integrated into CPU packages. IC Role / Device Role / Timing Role: ADM1022ARQ-REEL acts as primary hardware thermal supervisor - measuring remote diodes every 200 ms, comparing against SMBus-programmed limits, and asserting INT/RST2 on violation. Use Value: Enables BIOS-triggered throttling or graceful shutdown before thermal damage, meeting Intel Thermal Monitor 2 (TM2) compliance requirements. | Use Scenario: Continuous monitoring of +12 V and +3.3 V rails in ATX power supplies to detect undervoltage conditions before system instability. IC Role / Device Role / Timing Role: ADM1022ARQ-REEL serves as dual-rail voltage supervisor - generating RST1 on VCC dropout and RST2 on VMON failure, with 50 mV hysteresis preventing chatter. Use Value: Prevents corrupted memory writes and filesystem corruption during brownout events by initiating controlled reset within 20 ms of fault detection. |
| Office Equipment Ambient Sensing | Test Instrument Over-Temperature Protection |
Use Scenario: Ambient temperature logging in laser printers and multifunction copiers to adjust fuser heater duty cycle and prevent paper jams. IC Role / Device Role / Timing Role: ADM1022ARQ-REEL functions as ambient thermal sensor - using internal bandgap ADC (±3°C accuracy) and reporting via SMBus to main MCU every 500 ms. Use Value: Reduces mechanical wear and extends consumable life by dynamically adapting thermal management to environmental conditions. | Use Scenario: Safety-critical over-temperature cutoff in benchtop oscilloscopes and spectrum analyzers during extended high-power RF signal generation. IC Role / Device Role / Timing Role: ADM1022ARQ-REEL operates as fail-safe thermal interlock - driving FAN_OFF low and asserting THERM (D2–/THERM pin) on >85°C ambient, independent of firmware. Use Value: Guarantees immediate fan-on and visual alarm activation even if main processor locks up, satisfying IEC 61010-1 Class II safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar temperature monitor and fan controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM95235CIMMX-2/NOPB | Higher remote accuracy (±1.5°C), 12-bit ADC, SPI interface only - no SMBus support. | Requires SPI host controller; lacks dual reset outputs and LDCM compatibility. | Choose for precision lab instruments where SMBus is unavailable and higher resolution is critical. |
| MAX6657ASA+ | Single remote channel, 10-bit DAC, 3.3 V only supply, no VMON input - no dual-supply monitoring. | Cannot replace dual-rail brownout detection; limited to 3.3 V systems without level shifters. | Choose for cost-sensitive embedded designs with single-CPU and fixed 3.3 V rail. |
Compared with LM95235CIMMX-2/NOPB and MAX6657ASA+, the ADM1022ARQ-REEL uniquely combines SMBus compatibility, dual remote diode inputs, dual independent reset outputs, and LDCM support - making it the only drop-in solution for legacy x86 PC/server thermal management requiring BIOS integration and brownout resilience.
Availability
ADM1022ARQ-REEL is available at Aetrix Electronics and suitable for server motherboard design, desktop PC power supply monitoring, office equipment thermal management, and test instrument safety interlocks requiring stable component supply across multi-year production cycles.
Supply support for ADM1022ARQ-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, headquartered in Norwood, MA, serving industrial, automotive, communications, and computing markets since 1965.
The ADM1022ARQ-REEL belongs to Analog Devices' Hardware Monitoring IC product line, designed specifically for x86 platform thermal and power integrity assurance - targeting PC, server, and embedded systems requiring SMBus-based, BIOS-integrated thermal supervision.
FAQ
What is the function of the ADD/NTEST_OUT pin on the ADM1022ARQ-REEL?
The ADD/NTEST_OUT pin on the ADM1022ARQ-REEL serves two roles: during normal operation, it is a three-state input that sets the two least-significant bits of the SMBus address (01011xx), allowing up to three devices on the same bus; during NAND board-level test mode, it becomes an output that drives test signals. Its state is sampled only at power-up, so changes require a full power cycle to take effect. This dual functionality eliminates need for external address jumpers while enabling production testability.
How does the ADM1022ARQ-REEL achieve accurate remote temperature measurement despite noise?
The ADM1022ARQ-REEL achieves robust remote temperature measurement through a combination of switched-current ΔVBE sensing, 65 kHz low-pass filtering, chopper-stabilized amplification, and 16-cycle digital averaging - reducing sensitivity to EMI and ground noise. Layout guidance mandates parallel D+/D– routing with guard traces and ≤1000 pF total shunt capacitance. Measured error remains <±5°C even with 100 mVp-p common-mode noise at 1 MHz, as validated in TPC 3 of the ADM1022ARQ-REEL datasheet.
Can the ADM1022ARQ-REEL monitor two remote diodes simultaneously?
Yes, the ADM1022ARQ-REEL can monitor two remote diodes simultaneously: D1+/D1– is a dedicated channel, while D2+/D2– (pins 12/11) is reconfigurable via Bit 7 of the Configuration Register. When enabled, both channels operate independently with 1°C resolution and ±5°C accuracy. The device performs sequential conversions - completing both measurements in under 200 ms - enabling real-time dual-CPU thermal tracking in servers without external multiplexing.
What fan control interface does the ADM1022ARQ-REEL provide?
The ADM1022ARQ-REEL provides analog fan speed control via its FAN_SPD pin - an 8-bit DAC output delivering 0–2.5 V with ±5% total unadjusted error at 2 mA load. It supports external op-amp/MOSFET drive circuits (e.g., Figure 5c) for 5 V or 12 V fans. Additionally, the FAN_OFF pin offers hardware-level fan disable independent of DAC value, enabling fail-safe shutdown on critical over-temperature events without software involvement.
Does the ADM1022ARQ-REEL support LDCM (Legacy Device Configuration Manager)?
Yes, the ADM1022ARQ-REEL explicitly supports LDCM as stated in its FEATURES section and GENERAL DESCRIPTION. This allows direct integration with legacy x86 BIOS implementations that use LDCM for thermal policy enforcement - enabling automatic fan speed adjustment, throttle activation, and shutdown sequences without custom driver development. LDCM compatibility ensures plug-and-play deployment in Intel PIIX4-based platforms and other SMBus-managed PC architectures.
ADM1022ARQ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Temperature Sensor
- Input Type:
- Digital
- Output Type:
- Serial
- Current - Supply:
- 2.6 mA
- Operating Temperature:
- 0°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
ADM1022ARQ-REEL FAQ
1.How can I place an order for ADM1022ARQ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM1022ARQ-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 ADM1022ARQ-REEL reliable?
The price and inventory of ADM1022ARQ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM1022ARQ-REEL is usually 5 days.
3.What payment methods are accepted for ADM1022ARQ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM1022ARQ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM1022ARQ-REEL?
ADM1022ARQ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM1022ARQ-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 ADM1022ARQ-REEL?
For technical support, including ADM1022ARQ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM1022ARQ-REEL requirements.
6.How does Aetrix verify that ADM1022ARQ-REEL is sourced from the original manufacturer or authorized distributors?
All ADM1022ARQ-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 ADM1022ARQ-REEL meets industry standards.
7.What is the process for return or replacement of ADM1022ARQ-REEL?
All ADM1022ARQ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM1022ARQ-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 ADM1022ARQ-REEL part is unused and in its original packaging.
Return procedure for ADM1022ARQ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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