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Analog Devices Inc. ADM1032AR-1
- Part No.:
- ADM1032AR-1
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM1032AR-1.pdf
- Description:
- SYSTEM TEMPERATURE MONITOR
- Quantity:
- Payment:
- Shipping:
Inventory:5,103
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Product details
Overview
ADM1032AR-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 systems.
For engineers reviewing the ADM1032AR-1 datasheet, ADM1032AR-1 pinout, ADM1032AR-1 application, or ADM1032AR-1 equivalent, this page delivers verified specifications, calibrated remote diode measurement architecture, SMBus address (0x4C), THERM hysteresis programming, and real-world thermal management use cases without generic assumptions.
Technical Context
The ADM1032AR-1 implements a two-current ΔVBE measurement method on an external thermal diode (e.g., 2N3904/06 or processor substrate transistor) to cancel base-emitter voltage variation, enabling factory-trimmed ideality factor (1.008) and eliminating per-unit calibration. Its on-chip ADC digitizes both local ambient and remote junction temperatures.
It features dual independent limit comparators (local/remote high/low/THERM), a status register with open-circuit detection (D+/D−), and SMBus alert functionality - all operating under a configurable conversion rate (0.0625–64 Hz) with averaging enabled at slower rates and disabled at 32/64 Hz for fast response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Remote Accuracy | ±1°C (60°C–100°C); enables reliable CPU die temperature monitoring without system-level calibration |
| Local Accuracy | ±1°C (0°C–100°C); supports precise ambient board-temperature tracking for thermal margining |
| Remote Resolution | 0.125°C; allows fine-grained thermal trend analysis and hysteresis tuning (e.g., 10°C default, programmable) |
| SMBus Address | 0x4C (7-bit); fixed for ADM1032AR-1, distinct from ADM1032-2 (0x4D), preventing bus conflicts in multi-sensor systems |
| Supply Range | 3.0 V to 5.5 V; interoperable with 3.3 V and 5 V logic domains without level-shifting |
| Operating Current | 170 μA typical at 0.0625 conv/sec; supports low-power thermal monitoring in always-on subsystems |
| Standby Current | 5.5 μA; permits background thermal surveillance during host sleep states |
| THERM Output | Open-drain, active-low comparator output; directly drives CPU THERM# input or fan controller enable pin |
Pinout & Package
ADM1032AR-1 is housed in an 8-lead SOIC package (JEDEC MS-012AA, 150 mil width), thermally characterized with θJA = 121°C/W, suitable for surface-mount reflow (Pb-free peak: 260°C).
| 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 for D+/D− sensing |
| D+ (Pin 2) | Remote sensor positive terminal | Connects to collector/base of discrete NPN (2N3904) or processor substrate diode; carries 230 μA source current |
| D− (Pin 3) | Remote sensor negative terminal | Biased ~0.6 V above GND via internal diode; rejects ground noise and enables accurate ΔVBE measurement |
| THERM (Pin 4) | Fail-safe overtemperature output | Open-drain, active-low; asserts when local or remote exceeds programmed THERM limit - no software polling required |
| GND (Pin 5) | Supply return | Reference for all analog measurements and digital I/O; must be low-impedance path to minimize sensing error |
| ALERT (Pin 6) | Configurable interrupt/alert output | Open-drain SMBus alert or host interrupt; latched until status register read and condition cleared |
| SDATA (Pin 7) | SMBus bidirectional data line | Open-drain, requires external pull-up; supports standard SMBus packet error checking and timeout (programmable) |
| SCLK (Pin 8) | SMBus clock input | Asynchronous edge-triggered; accepts up to 400 kHz clock; timing compliant with SMBus v1.1 |
Key Features
| Feature | Design Value |
|---|---|
| ΔVBE remote sensing | Eliminates need for per-board VBE calibration by measuring voltage difference at two currents (I and N×I), rejecting process variation |
| Programmable THERM hysteresis | Adjustable from 0°C to >10°C via register 0x21; prevents oscillation during thermal transitions near trip point |
| Remote sensor open-circuit detection | Status bit OPEN1 (bit 2) flags D+/D− disconnect; avoids false overtemperature alarms in failed sensor conditions |
| Consecutive ALERT filtering | Configurable fault queue (1–4 out-of-limit readings) suppresses transient noise-induced interrupts at high conversion rates |
| Offset correction registers | 11-bit twos-complement offset (registers 0x11/0x12) compensates for PCB trace resistance and EMI-induced DC offsets on D+/D− |
| One-shot conversion mode | Initiated via write to address 0x0F; performs single measurement in standby, then returns to low-power state - ideal for event-triggered reads |
Applications
| Desktop PC Thermal Management | Industrial Embedded Controller |
|---|---|
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 (ambient) and remote (processor diode) readings via SMBus to BIOS/firmware for dynamic fan speed control and thermal throttling. Use Value: Enables hardware-level THERM# assertion within 142.8 ms (max conversion time), bypassing OS latency to prevent CPU thermal shutdown. | Use Scenario: Continuous thermal supervision of power supply MOSFETs and FPGA junctions in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Remote diode sensor interfaced to discrete 2N3906 transistors mounted on heat sinks; local sensor monitors enclosure air temperature. Use Value: ±1°C remote accuracy ensures safe derating of power components; programmable limits trigger relay cutoff before thermal runaway occurs. |
| Smart Battery Pack Monitoring | Telecom Line Card Thermal Protection |
Use Scenario: Integration into lithium-ion battery packs to track cell temperature gradients and detect hot spots during charge/discharge cycles. IC Role / Device Role / Timing Role: Measures temperature at multiple points using external diodes; communicates via SMBus to battery management system (BMS) microcontroller. Use Value: 0.125°C remote resolution allows detection of <1°C rise across cells, supporting balanced charging algorithms and early overtemperature warning. | Use Scenario: Thermal guard for high-density optical transceivers and DSP ASICs on telecom line cards operating in NEBS-compliant cabinets. IC Role / Device Role / Timing Role: Local sensor tracks card ambient; remote sensors monitor ASIC junctions via substrate diodes; THERM output directly gates 48 V cooling fans. Use Value: 5.5 μA standby current extends uptime during low-traffic periods; SMBus address 0x4C enables daisy-chaining with other ADM1032AR-1 units on same bus. |
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 (−25°C to +125°C), 12-bit resolution, automotive AEC-Q100 Grade 1 qualified | Targeted for automotive ECUs; lacks THERM output; uses I²C not SMBus | Select when automotive qualification and higher accuracy are mandatory; avoid if SMBus alert/THERM integration is required |
| MAX6642AESA+ | ±2°C remote accuracy, 11-bit resolution, fixed 0x48 SMBus address, no offset registers | Lower-cost alternative with reduced calibration flexibility; no open-circuit detection | Choose for cost-sensitive industrial designs where ±2°C tolerance is acceptable and sensor reliability is assured |
Compared with LM94022QDCNTQ1 and MAX6642AESA+, the ADM1032AR-1 uniquely combines SMBus-native alert/THERM signaling, programmable hysteresis, and open-circuit fault detection - making it optimal for PC and embedded thermal safety systems requiring fail-safe hardware responses.
Availability
ADM1032AR-1 is available at Aetrix Electronics and suitable for desktop PC thermal management, industrial embedded controllers, smart battery packs, telecom line cards, and instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for ADM1032AR-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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The ADM1032 product line was designed specifically for PC and embedded thermal management systems requiring dual-channel, SMBus-compatible temperature monitoring with hardware fail-safe outputs and robust remote diode sensing.
FAQ
What is the SMBus address of the ADM1032AR-1?
The ADM1032AR-1 has a fixed 7-bit SMBus address of 0x4C (1001100b). This distinguishes it from the ADM1032-2 variant (0x4D) and ensures deterministic bus arbitration in multi-device configurations. The address is hardwired and cannot be altered via pins or registers. All communication with the ADM1032AR-1 - including reading local/remote temperature values, writing limit thresholds, or configuring the THERM hysteresis - must use this address.
How does the ADM1032AR-1 achieve ±1°C remote accuracy without calibration?
The ADM1032AR-1 achieves ±1°C remote accuracy through a patented two-current ΔVBE measurement technique that cancels process-dependent variations in the base-emitter voltage of the external thermal diode. It operates the diode at two precise currents (I and N×I), measures the resulting voltage difference, and converts that to temperature using Boltzmann's constant and a factory-trimmed ideality factor of 1.008. This eliminates the need for board-level calibration while maintaining accuracy across temperature and supply voltage ranges - a core capability of the ADM1032AR-1.
Can the ADM1032AR-1 detect an open remote sensor connection?
Yes, the ADM1032AR-1 includes dedicated open-circuit detection on the D+ and D− inputs. When the remote sensor is disconnected or fails open, bit 2 (OPEN1) in the status register (address 0x02) is set high. This flag persists until the sensor is restored and the status register is read - ensuring reliable fault reporting without false positives from transient noise. This feature is integral to the ADM1032AR-1's robustness in mission-critical thermal monitoring applications.
What is the function of the THERM output on the ADM1032AR-1?
The THERM output on the ADM1032AR-1 is an open-drain, active-low comparator output that asserts when either the local or remote temperature exceeds its respective programmable THERM limit. Unlike the ALERT output, THERM requires no software servicing - it self-clears automatically once temperatures fall back within limits. This hardware-level response enables direct CPU clock throttling or fan on/off control without firmware intervention, a defining safety feature of the ADM1032AR-1.
Does the ADM1032AR-1 support both 3.3 V and 5 V supply voltages?
Yes, the ADM1032AR-1 operates across a supply range of 3.0 V to 5.5 V, making it compatible with both 3.3 V and 5 V logic domains. Its internal regulators and sensing circuitry maintain specified accuracy (±1°C remote, ±1°C local) and timing compliance (SMBus 400 kHz max) across this full range. The undervoltage lockout threshold (2.35–2.8 V) ensures reliable reset behavior during brownout conditions - a key design attribute confirmed in the ADM1032AR-1 datasheet.
ADM1032AR-1 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-1 FAQ
1.How can I place an order for ADM1032AR-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM1032AR-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 ADM1032AR-1 reliable?
The price and inventory of ADM1032AR-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM1032AR-1 is usually 5 days.
3.What payment methods are accepted for ADM1032AR-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM1032AR-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM1032AR-1?
ADM1032AR-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM1032AR-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 ADM1032AR-1?
For technical support, including ADM1032AR-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM1032AR-1 requirements.
6.How does Aetrix verify that ADM1032AR-1 is sourced from the original manufacturer or authorized distributors?
All ADM1032AR-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 ADM1032AR-1 meets industry standards.
7.What is the process for return or replacement of ADM1032AR-1?
All ADM1032AR-1 units undergo pre-shipment inspection (PSI). If there is an issue with ADM1032AR-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 ADM1032AR-1 part is unused and in its original packaging.
Return procedure for ADM1032AR-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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