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Analog Devices Inc. ADM1032AR
- Part No.:
- ADM1032AR
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM1032AR.pdf
- Description:
- SYSTEM TEMPERATURE MONITOR
- Quantity:
- Payment:
- Shipping:
Inventory:5,306
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Product details
Overview
ADM1032AR from Analog Devices is a dual-channel SMBus-compatible digital temperature monitor IC that measures local ambient temperature and remote diode-based temperature (e.g., CPU die or 2N3904/06 transistor) with ±1°C accuracy on the remote channel and ±3°C on the local channel, 0.125°C remote resolution, and programmable THERM/ALERT outputs for thermal management in embedded computing systems.
For engineers reviewing the ADM1032AR datasheet, ADM1032AR pinout, ADM1032AR application, or ADM1032AR equivalent, this page delivers verified technical context, real-world design meaning of specifications, validated pin functions, confirmed alternative parts, and supply-ready availability details - all grounded in Analog Devices Rev. E documentation.
Technical Context
The ADM1032AR implements a two-current ΔVBE measurement technique to cancel base-emitter voltage variation across remote thermal diodes, enabling accurate remote sensing without per-device calibration. Its chopper-stabilized amplifier and 65 kHz low-pass filter suppress noise while digitizing temperature data into twos-complement format.
It operates in free-running or one-shot mode via SMBus-configurable conversion rates (0.0625–64 Hz), supports open-drain ALERT and THERM outputs with programmable hysteresis and fault queueing, and maintains full SMBus slave functionality-including address pointer register access and status flag reporting-even in 5.5 μA standby mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Remote Accuracy | ±1°C (60°C–100°C range); enables reliable CPU die thermal monitoring without system-level recalibration |
| Local Accuracy | ±3°C (0°C–100°C); sufficient for ambient board-temperature supervision in desktop/notebook thermal control loops |
| Remote Resolution | 0.125°C; supports fine-grained fan speed or clock throttling decisions based on sub-degree temperature changes |
| Supply Voltage | 3.0 V to 5.5 V; interoperable with both 3.3 V and 5 V system rails without level-shifting circuitry |
| Operating Current | 170 μA typical at 0.0625 conversions/sec; allows continuous monitoring in power-constrained embedded controllers |
| Standby Current | 5.5 μA; permits low-power thermal watchdog operation during system sleep states |
| SMBus Address | 0x4C (7-bit); fixed address ensures deterministic bus arbitration in multi-sensor thermal management systems |
Pinout & Package
ADM1032AR is housed in an 8-lead SOIC package (SOIC_N), with pin 1 marked by a notch or dot. All pins are electrically defined per Analog Devices Rev. E datasheet Figure 3 and Table 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VDD) | Positive supply input | Accepts 3.0–5.5 V; powers internal ADC, SMBus interface, and bias circuits - must be decoupled near pin |
| 2 (D+) | Remote sensor positive terminal | Connects to collector/base of external thermal diode (e.g., 2N3904); carries 230 μA measurement current |
| 3 (D−) | Remote sensor negative terminal | Biased ~0.6 V above GND internally; rejects ground noise and enables accurate ΔVBE sensing |
| 4 (THERM) | Open-drain overtemperature comparator output | Drives CPU throttling or fan ON/OFF directly; requires external pull-up to VDD; asserts low when limits exceeded |
| 5 (GND) | Supply ground reference | Return path for VDD, D+, D−, and internal analog/digital blocks - must be low-impedance plane |
| 6 (ALERT) | Open-drain SMBus alert/interrupt output | Signals out-of-limit condition to host controller; compatible with SMBus Alert Response Protocol (ARP) |
| 7 (SDATA) | SMBus bidirectional data line | Open-drain I/O; requires external pull-up; supports read/write of all registers including limits, config, and status |
| 8 (SCLK) | SMBus clock input | Asynchronous timing reference up to 400 kHz; defines setup/hold timing for SDATA transitions |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel ΔVBE sensing | Eliminates need for factory calibration of remote thermal diodes - reduces BOM cost and test time |
| Programmable THERM hysteresis | Configurable via register 0x21 (default 10°C); prevents oscillation during thermal transients in fan control loops |
| Consecutive ALERT filtering | Register 0x22 sets fault persistence (1–4 measurements); suppresses false alarms from transient noise spikes |
| On-chip offset correction | 11-bit signed offset registers (0x11/0x12) compensate for PCB trace resistance and layout-induced errors |
| Low-power standby mode | 5.5 μA consumption with SMBus active - enables thermal monitoring during OS suspend without waking CPU |
Applications
| Desktop PC Thermal Management | Notebook CPU Die Monitoring |
|---|---|
|
Use Scenario: Real-time tracking of motherboard ambient and processor junction temperature during load transitions. IC Role / Device Role / Timing Role: Dual-channel temperature sensor providing independent local (PCB) and remote (CPU die) readings over SMBus for BIOS/EC thermal policy enforcement. Use Value: Enables dynamic fan speed control and CPU throttling using ±1°C remote accuracy - avoids thermal shutdown while maximizing performance. |
Use Scenario: Compact thermal supervision in space-constrained laptop designs where discrete diode placement is limited. IC Role / Device Role / Timing Role: Remote temperature monitor interfacing with integrated thermal diode on Intel/AMD mobile processors via D+/D− pins. Use Value: 0.125°C resolution supports precise thermal ramp detection - critical for maintaining acoustic comfort and battery life under variable workloads. |
| Industrial Controller Cabinet Monitoring | Telecom Line Card Temperature Protection |
|
Use Scenario: Ambient and heatsink temperature monitoring in PLC enclosures exposed to wide industrial temperature ranges. IC Role / Device Role / Timing Role: Local sensor measures enclosure air temperature; remote channel monitors heatsink-mounted transistor junction via discrete 2N3906. Use Value: ±3°C local accuracy and open-circuit fault detection (STATUS[2]) ensure reliable thermal fail-safe operation in unattended deployments. |
Use Scenario: Overtemperature protection for high-density optical transceiver modules in carrier-grade switches. IC Role / Device Role / Timing Role: Dual-channel alarm generator triggering THERM output to disable laser drivers before semiconductor damage occurs. Use Value: Programmable THERM limits and hysteresis prevent nuisance shutdowns during burst traffic-induced thermal spikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel remote/local 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, but no THERM output - only ALERT | Lacks dedicated hardware THERM comparator; requires GPIO-driven software throttling instead of direct CPU/fan control | Choose when ultra-precise remote sensing is prioritized over hardware fail-safe response. |
| MAX6642AESA+ | Same 8-pin SOIC package, 0.125°C remote resolution, but uses I²C (not SMBus-specific) and lacks consecutive ALERT filtering | No built-in fault queueing - more susceptible to noise-induced false alerts in electrically noisy telecom environments | Choose when I²C compatibility is required and system-level filtering can be implemented in firmware. |
Compared with LM94022QIMME/NOPB and MAX6642AESA+, the ADM1032AR uniquely integrates SMBus-alert-ready interrupt signaling, hardware THERM output with programmable hysteresis, and consecutive-measurement fault filtering - making it optimal for robust, low-latency thermal safety in PC and industrial control platforms.
Availability
ADM1032AR is available at Aetrix Electronics and suitable for desktop computers, notebook thermal subsystems, and industrial controller cabinets requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for ADM1032AR 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 R&D and manufacturing operations spanning 15+ countries.
The ADM1032AR belongs to Analog Devices' precision thermal monitoring product line, designed specifically for SMBus-based PC and embedded system thermal management - emphasizing accuracy, low power, and hardware-assisted fail-safe response.
FAQ
What is the remote temperature accuracy specification for ADM1032AR?
The ADM1032AR achieves ±1°C remote temperature accuracy over the 60°C to 100°C range when measuring a properly biased thermal diode (e.g., 2N3904/06), and ±3°C over 0°C to 120°C. This is specified at VDD = 3 V to 3.6 V and reflects the device's calibrated ΔVBE measurement architecture - not a typical datasheet "typical" value but a guaranteed limit per Analog Devices Rev. E specifications.
Does ADM1032AR support both SMBus and standard I²C protocols?
ADM1032AR is fully SMBus 1.1 compliant, supporting features like Alert Response Protocol (ARP), timeout, and packet error checking. While its electrical interface is compatible with standard I²C clocks and data levels, it does not implement I²C-specific features such as 10-bit addressing or clock stretching. For reliable operation in mixed-bus systems, configure the host to use SMBus timing and command protocols as defined in the ADM1032AR datasheet.
How is the THERM output configured on ADM1032AR?
The THERM output on ADM1032AR is a dedicated open-drain comparator that asserts low when either local or remote temperature exceeds its respective THERM limit register (0x19 for remote, 0x20 for local). These limits and associated hysteresis (register 0x21) are fully programmable over SMBus. No external logic is needed - THERM drives fans or throttles CPUs directly when pulled up to VDD.
Can ADM1032AR operate in low-power standby mode while retaining SMBus accessibility?
Yes - ADM1032AR enters standby mode when bit 6 of the Configuration Register (address 0x03) is set to 1. In this state, the ADC halts, reducing supply current to 5.5 μA, yet the SMBus interface remains fully operational: registers can be read/written, ALERT and THERM outputs remain active, and one-shot conversions can be triggered via register 0x0F - enabling intelligent power-aware thermal supervision.
What package type and pin count does ADM1032AR use?
ADM1032AR is supplied in an 8-lead SOIC (Small Outline Integrated Circuit) package, also designated SOIC_N, with standard 1.27 mm pitch. Pin 1 is identified by a notch or dot. This package matches the mechanical footprint and thermal characteristics (θJA = 121°C/W) documented in Analog Devices Rev. E datasheet page 4 and outline drawing page 18.
ADM1032AR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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:
- 7 b
- 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:
- 8-SOIC
ADM1032AR FAQ
1.How can I place an order for ADM1032AR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM1032AR 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 ADM1032AR reliable?
The price and inventory of ADM1032AR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM1032AR is usually 5 days.
3.What payment methods are accepted for ADM1032AR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM1032AR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM1032AR?
ADM1032AR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM1032AR 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 ADM1032AR?
For technical support, including ADM1032AR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM1032AR requirements.
6.How does Aetrix verify that ADM1032AR is sourced from the original manufacturer or authorized distributors?
All ADM1032AR 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 ADM1032AR meets industry standards.
7.What is the process for return or replacement of ADM1032AR?
All ADM1032AR units undergo pre-shipment inspection (PSI). If there is an issue with ADM1032AR, 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 ADM1032AR part is unused and in its original packaging.
Return procedure for ADM1032AR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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