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Analog Devices Inc. ADM1032ARM-REEL
- Part No.:
- ADM1032ARM-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog and Digital Output
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADM1032ARM-REEL.pdf
- Description:
- PLUS/MINUS 1 DEGREE CELSIUS REMO
- Quantity:
- Payment:
- Shipping:
Inventory:69,000
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Product details
Overview
ADM1032ARM-REEL from Analog Devices is a dual-channel SMBus-compatible digital temperature monitor IC that measures local ambient temperature and remote diode-based temperature with ±1°C accuracy on the remote channel and ±3°C on the local channel, supporting up to 64 conversions per second for thermal management in desktop PCs and embedded controllers.
For engineers reviewing the ADM1032ARM-REEL datasheet, ADM1032ARM-REEL pinout, ADM1032ARM-REEL application, or ADM1032ARM-REEL equivalent, key selection criteria include its 0.125°C remote resolution, programmable THERM output with hysteresis, open-drain ALERT and THERM outputs, 3 V to 5.5 V supply range, and 8-lead MSOP package compatibility with thermal diode sensors like 2N3904/2N3906.
Technical Context
The ADM1032ARM-REEL implements a dual-sensor architecture with an on-chip bandgap-based local temperature sensor and a remote sensing circuit that measures ΔVBE across an external bipolar junction transistor (e.g., 2N3904) using two switched current sources (230 μA high / 13 μA low) and a 65 kHz low-pass filter followed by chopper-stabilized amplification.
It features a fully SMBus 1.1–compliant 2-wire interface with programmable conversion rate (0.0625–64 Hz), configurable fault queue depth (1–4 consecutive out-of-limit events), and independent high/low/THERM limit registers for both channels, enabling CPU throttling or fan control via the dedicated open-drain THERM output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Remote Accuracy | ±1°C at 60°C–100°C; enables precise processor die thermal monitoring without calibration |
| Local Accuracy | ±3°C over 0°C–100°C; sufficient for ambient board-level thermal supervision |
| Remote Resolution | 0.125°C (1 LSB); supports fine-grained thermal trend analysis in closed-loop systems |
| Supply Range | 3.0 V to 5.5 V; interoperable with 3.3 V and 5 V system rails without level shifting |
| Operating Current | 170 μA typical at 0.0625 Hz; allows continuous monitoring in power-constrained embedded designs |
| Standby Current | 5.5 μA; enables ultra-low-power thermal watchdog operation during system sleep |
| SMBus Address | 0x4C (7-bit); fixed address simplifies multi-device bus arbitration in PC thermal subsystems |
| Conversion Rate | Configurable from 0.0625 to 64 conversions/sec; balances responsiveness vs. power in real-time thermal control |
Pinout & Package
ADM1032ARM-REEL is housed in an 8-lead MSOP package (3.0 mm × 3.0 mm × 0.85 mm body, 0.65 mm lead pitch), optimized for space-constrained PCB layouts near CPUs or power stages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts 3.0 V–5.5 V; powers internal ADC, SMBus interface, and bias circuits |
| D+ (Pin 2) | Remote sensor positive terminal | Connects to emitter/base of external thermal diode (e.g., 2N3904); carries 230 μA measurement current |
| D− (Pin 3) | Remote sensor negative terminal | Biased ~0.6 V above GND via internal diode; rejects ground noise in noisy environments |
| THERM (Pin 4) | Open-drain overtemperature comparator output | Asserts low when local or remote temp exceeds programmed THERM limit; drives CPU throttle or fan ON/OFF |
| GND (Pin 5) | Supply ground reference | Common return path for VDD, D− bias, and digital I/O; requires low-impedance PCB connection |
| ALERT (Pin 6) | Open-drain SMBus alert/interrupt output | Pulls low on any limit violation (local high/low, remote high/low, open-circuit); compatible with SMBus Alert Response Protocol |
| SDATA (Pin 7) | Open-drain SMBus data line | Bi-directional serial data; requires external pull-up to VDD for proper SMBus signaling |
| SCLK (Pin 8) | SMBus clock input | Asynchronous master-generated clock; supports up to 400 kHz; requires external pull-up to VDD |
Key Features
| Feature | Design Value |
|---|---|
| Remote diode sensing with ΔVBE method | Eliminates need for per-unit VBE calibration; achieves ±1°C accuracy using standard 2N3904/2N3906 transistors |
| Programmable THERM hysteresis | Adjustable from 0°C to full scale via register 0x21; prevents oscillation during thermal transitions near trip point |
| Consecutive fault detection | Configurable 1–4 out-of-limit samples required before ALERT assertion; suppresses false alarms from transient noise |
| Open-circuit sensor detection | Automatically flags D+/D− disconnection in status register bit 2; enables fail-safe thermal monitoring |
| Low-power standby mode | Reduces current to 5.5 μA while retaining SMBus accessibility and THERM/ALERT functionality |
| Offset correction registers | 11-bit twos-complement remote offset (registers 0x11/0x12); compensates for PCB trace resistance and layout-induced errors |
Applications
| Desktop PC Thermal Management | Notebook CPU Monitoring |
|---|---|
|
Use Scenario: Real-time monitoring of CPU die temperature and motherboard ambient temperature in x86-based desktop systems. IC Role / Device Role / Timing Role: Dual-channel temperature sensor providing local (chip ambient) and remote (processor diode) readings via SMBus to BIOS or EC firmware. Use Value: Enables dynamic fan speed control and CPU throttling based on validated ±1°C remote accuracy, reducing acoustic noise and preventing thermal shutdown. |
Use Scenario: Compact thermal supervision of mobile processors and battery packs in space-constrained notebook platforms. IC Role / Device Role / Timing Role: Remote temperature monitor interfacing with integrated thermal diodes on Intel/AMD mobile CPUs and local sensor for battery compartment heat detection. Use Value: 8-lead MSOP footprint and 5.5 μA standby current support always-on thermal watchdog functionality without compromising battery life. |
| Industrial PLC Controller | Telecom Line Card Monitoring |
|
Use Scenario: Overtemperature protection for field-programmable gate arrays (FPGAs) and power MOSFETs in programmable logic controllers operating in harsh industrial environments. IC Role / Device Role / Timing Role: Local sensor tracks heatsink temperature while remote channel monitors FPGA junction via external diode; THERM output directly gates cooling fans. Use Value: Programmable THERM hysteresis (register 0x21) prevents fan chatter during slow thermal drift, improving system reliability in unattended operation. |
Use Scenario: Thermal safety monitoring of high-density optical transceivers and DC-DC converters on telecom line cards with strict NEBS compliance requirements. IC Role / Device Role / Timing Role: Dual-sensor IC reporting local board temperature and remote laser diode temperature over shared SMBus with other PMBus devices. Use Value: SMBus address 0x4C ensures plug-and-play integration into existing thermal management firmware without address conflicts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel temperature monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM94022QIMME/NOPB | Higher remote accuracy (±0.7°C), 1.5 V to 5.5 V supply, no THERM output - only ALERT | Lacks dedicated THERM comparator; requires external logic for CPU throttling or fan control | Choose when higher remote precision is critical and system already provides fan/CPU control logic |
| MAX6642AESA+ | Same 8-pin SOIC/MSOP footprint, ±2°C remote accuracy, 2.7 V to 5.5 V supply, fixed 10°C THERM hysteresis | Non-programmable THERM hysteresis limits flexibility in thermally noisy environments | Choose for drop-in replacement where SMBus address 0x4C and pinout match, but accept fixed hysteresis |
Compared with LM94022QIMME/NOPB and MAX6642AESA+, the ADM1032ARM-REEL uniquely combines programmable THERM hysteresis, open-circuit detection, and 0.125°C remote resolution in a single 8-lead MSOP package - making it optimal for cost-sensitive, space-constrained thermal safety systems requiring autonomous fan/CPU control.
Availability
ADM1032ARM-REEL is available at Aetrix Electronics and suitable for desktop computers, smart batteries, industrial controllers, telecommunications equipment, and embedded systems requiring stable component supply with guaranteed long-term sourcing.
Supply support for ADM1032ARM-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, serving industrial, automotive, communications, and computing markets since 1965.
The ADM1032ARM-REEL belongs to Analog Devices' thermal management IC product line, designed specifically for accurate, low-power, SMBus-based temperature monitoring in PC, server, and embedded thermal control systems.
FAQ
What is the SMBus address of the ADM1032ARM-REEL?
The ADM1032ARM-REEL uses a fixed 7-bit SMBus address of 0x4C (1001100b). This differs from the ADM1032-2 variant, which uses 0x4D. The address is hardwired and not user-configurable, ensuring deterministic bus communication in multi-device thermal subsystems.
Does the ADM1032ARM-REEL support remote temperature sensing with discrete transistors?
Yes, the ADM1032ARM-REEL supports remote sensing using common NPN transistors such as the 2N3904 or 2N3906. Its ΔVBE measurement technique eliminates the need for device-specific calibration, and the D+ and D− inputs are designed to interface directly with the transistor's base-emitter junction.
How does the THERM output function in the ADM1032ARM-REEL?
The THERM output of the ADM1032ARM-REEL is an open-drain comparator that asserts low when either the local or remote temperature exceeds its independently programmable THERM limit register value. It remains asserted until both channels fall within limits, and its hysteresis is adjustable via register 0x21.
What is the purpose of the offset registers in the ADM1032ARM-REEL?
Offset registers (0x11 and 0x12) in the ADM1032ARM-REEL store an 11-bit twos-complement correction value applied to the remote temperature reading. They compensate for voltage drops caused by series resistance in D+/D− traces or noise coupling, enabling achievement of the specified ±1°C remote accuracy in real-world PCB layouts.
Can the ADM1032ARM-REEL operate in low-power standby mode while maintaining alert functionality?
Yes, the ADM1032ARM-REEL supports a low-power standby mode (enabled via Configuration Register Bit 6) drawing only 5.5 μA. In this mode, the ADC halts, but the SMBus interface, ALERT output, and THERM output remain fully operational - allowing continuous thermal fault detection without active conversion.
ADM1032ARM-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Sensor Type:
- Digital, Local/Remote
- Sensing Temperature - Local:
- 0°C ~ 100°C
- Sensing Temperature - Remote:
- 0°C ~ 120°C
- Output Type:
- SMBus
- Voltage - Supply:
- 3V ~ 5.5V
- Resolution:
- -
- Features:
- Output Switch, Programmable Limit, Standby Mode
- Accuracy - Highest (Lowest):
- ±3°C
- Test Condition:
- 0°C ~ 100°C
- Operating Temperature:
- 0°C ~ 120°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- Micro8™
ADM1032ARM-REEL FAQ
1.How can I place an order for ADM1032ARM-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM1032ARM-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 ADM1032ARM-REEL reliable?
The price and inventory of ADM1032ARM-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM1032ARM-REEL is usually 5 days.
3.What payment methods are accepted for ADM1032ARM-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM1032ARM-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM1032ARM-REEL?
ADM1032ARM-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM1032ARM-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 ADM1032ARM-REEL?
For technical support, including ADM1032ARM-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM1032ARM-REEL requirements.
6.How does Aetrix verify that ADM1032ARM-REEL is sourced from the original manufacturer or authorized distributors?
All ADM1032ARM-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 ADM1032ARM-REEL meets industry standards.
7.What is the process for return or replacement of ADM1032ARM-REEL?
All ADM1032ARM-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM1032ARM-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 ADM1032ARM-REEL part is unused and in its original packaging.
Return procedure for ADM1032ARM-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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