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Analog Devices Inc. ADM1032ARM-1
- Part No.:
- ADM1032ARM-1
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog and Digital Output
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADM1032ARM-1.pdf
- Description:
- SYSTEM TEMPERATURE MONITOR
- Quantity:
- Payment:
- Shipping:
Inventory:7,229
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Product details
Overview
ADM1032ARM-1 from Analog Devices is a dual-channel SMBus-compatible digital temperature monitor IC with ±1°C remote and local sensing accuracy, 0.125°C remote resolution, programmable THERM/ALERT outputs, and 3 V to 5.5 V operation - used for CPU thermal throttling and fan control in desktop PCs and embedded controllers.
For engineers reviewing the ADM1032ARM-1 datasheet, ADM1032ARM-1 pinout, ADM1032ARM-1 application, or ADM1032ARM-1 equivalent, key selection criteria include remote diode sensor interface capability, SMBus address (0x4C), THERM output hysteresis programmability, and 8-lead MSOP package compatibility with thermal management subsystems.
Technical Context
The ADM1032ARM-1 integrates on-chip local temperature sensing and remote diode sensing using ΔVBE measurement at two current levels (I and N×I) to eliminate base-emitter voltage calibration drift. Its chopper-stabilized amplifier and 65 kHz low-pass filter reject noise while enabling ±1°C accuracy over 60°C–100°C on the remote channel.
It implements SMBus-compliant serial communication with programmable conversion rates (0.0625–64 Hz), configurable ALERT/THERM interrupt behavior, open-circuit detection on D+/D−, and register-based limit comparison logic that drives dedicated open-drain outputs without host polling overhead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Remote Accuracy | ±1°C (60°C–100°C); enables reliable CPU die temperature monitoring without per-unit calibration |
| Local Accuracy | ±1°C (0°C–100°C); supports ambient board-level thermal supervision |
| Remote Resolution | 0.125°C; allows fine-grained thermal margining in high-performance systems |
| SMBus Address | 0x4C (7-bit); fixed address for deterministic multi-device bus topology |
| Supply Range | 3.0 V–5.5 V; interoperable with 3.3 V and 5 V system rails |
| Operating Current | 170 μA typical at 0.0625 conv/sec; enables low-power thermal monitoring in always-on subsystems |
| Standby Current | 5.5 μA; permits extended sleep-mode operation without disabling thermal safety |
| THERM Output | Open-drain comparator with programmable limits/hysteresis; directly interfaces to CPU THERM# input or fan controller enable pin |
Pinout & Package
ADM1032ARM-1 is housed in an 8-lead MSOP package (3.0 mm × 3.0 mm, 0.65 mm pitch), optimized for compact thermal sensor placement near processors or power stages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts 3.0–5.5 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., 2N3906) or processor substrate transistor |
| D− (Pin 3) | Remote sensor negative terminal | Biased above GND via internal diode to reject ground noise; requires no external reference |
| THERM (Pin 4) | Overtemperature comparator output | Open-drain output asserting low when local/remote exceeds THERM limit; pulls CPU THERM# or fan enable |
| GND (Pin 5) | Supply ground | Reference for all analog and digital circuitry; must be low-impedance connection to system ground plane |
| ALERT (Pin 6) | Interrupt/alert output | Open-drain SMBus alert signal; latched until status register read; usable as hardware interrupt to host controller |
| SDATA (Pin 7) | SMBus data I/O | Open-drain bidirectional line; requires external pull-up to VDD; supports standard SMBus read/write protocols |
| SCLK (Pin 8) | SMBus clock input | Asynchronous clock input up to 400 kHz; timing-critical for register access and configuration updates |
Key Features
| Feature | Design Value |
|---|---|
| ΔVBE remote sensing | Eliminates need for factory calibration by measuring base-emitter voltage difference at two currents |
| Programmable THERM hysteresis | Adjustable from 0°C to full scale via register 0x21; prevents oscillation during thermal transients |
| Remote sensor open-circuit detection | Automatically flags D+/D− disconnect in status register bit 2; avoids false-overtemp shutdowns |
| Consecutive ALERT filtering | Configurable fault queue (1–4 out-of-limit readings) reduces false interrupts in noisy environments |
| Low-power standby mode | ADC disabled while SMBus remains active; enables background configuration without thermal monitoring overhead |
| Offset correction registers | 11-bit twos-complement offset compensation (registers 0x11/0x12) corrects PCB trace resistance errors |
Applications
| Desktop PC Thermal Management | Industrial PLC Cabinet Monitoring |
|---|---|
Use Scenario: Real-time CPU die and motherboard ambient temperature tracking during load transitions. IC Role / Device Role / Timing Role: Dual-channel temperature monitor providing independent local (chip junction) and remote (processor diode) measurements via SMBus. Use Value: Enables dynamic CPU clock throttling via THERM output and system-level thermal alerts via ALERT, meeting Intel PROCHOT# timing requirements. | Use Scenario: Continuous monitoring of enclosure ambient and power module heatsink temperatures in factory automation cabinets. IC Role / Device Role / Timing Role: Local sensor measures ambient air; remote sensor monitors discrete MOSFET thermal diode; both channels feed PLC supervisory logic. Use Value: 0.125°C remote resolution and ±1°C accuracy allow precise derating of IGBT drivers before thermal runaway occurs. |
| Smart Battery Pack Safety | Telecom Line Card Thermal Control |
Use Scenario: Cell-level temperature supervision in multi-cell Li-ion battery packs with integrated fuel gauging. IC Role / Device Role / Timing Role: Remote channel reads thermal diode on each cell block; local channel monitors BMS ASIC temperature. Use Value: Programmable THERM limits trigger immediate charge termination or discharge cutoff, satisfying UL 1642 thermal shutdown response time mandates. | Use Scenario: Hot-swap line card temperature regulation in carrier-grade Ethernet switches with forced-air cooling. IC Role / Device Role / Timing Role: Monitors ASIC die temperature (remote) and board ambient (local); drives variable-speed fan controller via THERM duty cycle. Use Value: 64 Hz max conversion rate enables sub-100 ms thermal response, preventing ASIC thermal throttling during burst traffic loads. |
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 |
|---|---|---|---|
| LM94022QDCNTQ1 | ±0.7°C remote accuracy (0°C–125°C), 12-bit resolution, automotive AEC-Q100 Grade 1 qualified | Targeted for automotive under-hood modules requiring extended temperature range and qualification | Select when automotive qualification, tighter remote accuracy, or wider operating range (−40°C to +150°C) is required |
| MAX6642AESA+ | Fixed 0x48 SMBus address, no remote offset register, 1°C remote resolution (not 0.125°C) | Lower-cost implementation where fine remote resolution and calibration flexibility are not needed | Select for cost-sensitive industrial applications where ±1°C remote accuracy suffices and SMBus address conflict must be avoided |
Compared with LM94022QDCNTQ1 and MAX6642AESA+, the ADM1032ARM-1 provides unique combination of programmable THERM hysteresis, remote sensor open-circuit detection, and 0.125°C resolution - making it optimal for PC thermal management where transient response and diagnostic reliability are critical.
Availability
ADM1032ARM-1 is available at Aetrix Electronics and suitable for desktop PC thermal management, industrial PLC cabinet monitoring, and telecom line card thermal control requiring stable component supply across long-lifecycle production programs.
Supply support for ADM1032ARM-1 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.
The ADM1032ARM-1 belongs to Analog Devices' precision thermal monitoring product line, designed specifically for real-time dual-point temperature supervision in computing and industrial control systems where SMBus integration and fail-safe thermal response are mandatory.
FAQ
What is the SMBus address of the ADM1032ARM-1?
The ADM1032ARM-1 uses a fixed 7-bit SMBus address of 0x4C (1001100b). This differs from the ADM1032-2 variant (0x4D) and ensures deterministic bus arbitration in multi-sensor systems. The address is hardwired and cannot be modified via pins or registers. All register reads and writes to the ADM1032ARM-1 must target this address.
How does the ADM1032ARM-1 achieve ±1°C remote accuracy without calibration?
The ADM1032ARM-1 achieves ±1°C remote accuracy by measuring ΔVBE across a thermal diode at two precisely controlled current levels (I and N×I), canceling process-dependent VBE offsets. Its internal chopper-stabilized amplifier and 65 kHz low-pass filter suppress noise, while digital averaging over 16 cycles further enhances stability - eliminating need for per-unit trimming or external calibration components in the ADM1032ARM-1 design.
Can the ADM1032ARM-1 monitor both CPU die and motherboard ambient temperature simultaneously?
Yes, the ADM1032ARM-1 simultaneously monitors CPU die temperature via its remote channel (connected to processor-integrated thermal diode or discrete 2N3906) and motherboard ambient temperature via its on-chip local sensor. Both measurements update independently at user-programmable rates (up to 64 Hz), with separate high/low/THERM limit registers - enabling coordinated thermal management in a single ADM1032ARM-1 device.
What is the function of the THERM output on the ADM1032ARM-1?
On the ADM1032ARM-1, the THERM output is an open-drain comparator that asserts low when either local or remote temperature exceeds its independently programmable limit (register 0x19 for remote, 0x20 for local). It features user-adjustable hysteresis (register 0x21) and does not require software clearing - automatically returning high when temperature falls back within limits, making it ideal for direct CPU PROCHOT# or fan enable interfacing.
Does the ADM1032ARM-1 support remote sensor open-circuit detection?
Yes, the ADM1032ARM-1 includes built-in remote sensor open-circuit detection. When the D+ and D− inputs are disconnected or exhibit excessive leakage, bit 2 (OPEN1) in the status register (address 0x03) is set high. This flag persists until the sensor is reconnected and a valid reading is acquired, allowing host firmware to distinguish true overtemperature faults from wiring failures - a critical diagnostic capability in the ADM1032ARM-1.
ADM1032ARM-1 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:
- 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:
- Micro8™
ADM1032ARM-1 FAQ
1.How can I place an order for ADM1032ARM-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM1032ARM-1 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-1 reliable?
The price and inventory of ADM1032ARM-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM1032ARM-1 is usually 5 days.
3.What payment methods are accepted for ADM1032ARM-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM1032ARM-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM1032ARM-1?
ADM1032ARM-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM1032ARM-1 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-1?
For technical support, including ADM1032ARM-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM1032ARM-1 requirements.
6.How does Aetrix verify that ADM1032ARM-1 is sourced from the original manufacturer or authorized distributors?
All ADM1032ARM-1 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-1 meets industry standards.
7.What is the process for return or replacement of ADM1032ARM-1?
All ADM1032ARM-1 units undergo pre-shipment inspection (PSI). If there is an issue with ADM1032ARM-1, 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-1 part is unused and in its original packaging.
Return procedure for ADM1032ARM-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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