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Analog Devices Inc. ADM1032AR-REEL
- Part No.:
- ADM1032AR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM1032AR-REEL.pdf
- Description:
- PLUS/MINUS 1 DEGREE CELSIUS REMO
- Quantity:
- Payment:
- Shipping:
Inventory:22,500
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Product details
Overview
ADM1032AR-REEL from Analog Devices is a dual-channel SMBus-compatible digital temperature monitor IC with ±1°C remote and ±3°C local accuracy, 0.125°C remote resolution, and open-drain THERM/ALERT outputs for thermal management in PCs and embedded systems. It measures both on-chip ambient temperature and external diode temperature (e.g., 2N3904/06 or processor die diode) using a calibrated ΔVBE technique.
For engineers reviewing the ADM1032AR-REEL datasheet, ADM1032AR-REEL pinout, ADM1032AR-REEL application, or ADM1032AR-REEL equivalent, key selection criteria include remote/local sensor accuracy, SMBus address (0x4C), THERM output hysteresis programmability, and 8-lead SOIC package compatibility with thermal diode biasing requirements.
Technical Context
The ADM1032AR-REEL implements a chopper-stabilized amplifier and 65 kHz low-pass filter to measure ΔVBE across two current levels (I and N×I) on the D+/D− inputs, enabling calibration-free remote sensing. Its internal ADC digitizes results into twos-complement format with 0.125°C LSB for remote and 1°C LSB for local channels.
It features dual independent limit comparators per channel (high/low/THERM), a status register with open-circuit detection (Bit 2), and programmable fault queue depth (1–4 consecutive out-of-limit events). The RUN/STOP bit (Config Reg Bit 6) enables low-power standby mode with 5.5 μA ICC while retaining SMBus accessibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Remote Accuracy | ±1°C (60°C–100°C); enables precise CPU/die thermal monitoring without factory calibration |
| Local Accuracy | ±3°C (0°C–100°C); sufficient for ambient board-level temperature tracking |
| Remote Resolution | 0.125°C; supports fine-grained thermal throttling decisions via THERM output |
| SMBus Address | 0x4C (7-bit); fixed address for deterministic system integration in multi-sensor configurations |
| Supply Range | 3.0 V to 5.5 V; compatible with standard 3.3 V and 5 V logic 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; allows background thermal surveillance with minimal power penalty |
| THERM Output | Open-drain comparator with programmable hysteresis (default 10°C); directly controls fan ON/OFF or CPU clock throttling |
Pinout & Package
ADM1032AR-REEL is housed in an 8-lead SOIC package (SOIC_N), with exposed pad not present. Pin functions are validated per Analog Devices Rev. E datasheet Figure 3 and Table 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts 3.0–5.5 V; powers all analog/digital blocks and requires local decoupling |
| D+ (Pin 2) | Remote sensor positive terminal | Biased at VDD/2 via internal circuitry; connects to emitter/base of external diode or processor thermal transistor |
| D− (Pin 3) | Remote sensor negative terminal | Bias-connected to internal diode; referenced above GND to reject ground noise in noisy environments |
| THERM (Pin 4) | Overtemperature fail-safe output | Open-drain output requiring external pull-up to VDD; asserts low when local/remote exceeds THERM limit |
| GND (Pin 5) | Supply ground reference | Common return path for VDD, D+, D−, ALERT, SDATA, SCLK; must be low-impedance |
| ALERT (Pin 6) | Interrupt/alert signaling output | Open-drain SMBus alert/interrupt; pulls low on any limit violation (local, remote, or open-circuit) |
| SDATA (Pin 7) | SMBus bidirectional data line | Open-drain I/O requiring external pull-up; supports standard SMBus read/write protocols |
| SCLK (Pin 8) | SMBus clock input | Input-only clock line requiring external pull-up; accepts up to 400 kHz SMBus timing |
Key Features
| Feature | Design Value |
|---|---|
| ΔVBE remote sensing | Eliminates need for per-unit VBE calibration by measuring voltage difference at two currents |
| Programmable THERM hysteresis | Adjustable from 0°C to >10°C via register 0x21; prevents oscillation during thermal transitions |
| Remote sensor open-circuit detection | Status register Bit 2 flags D+/D− disconnection; prevents false overtemperature alarms |
| Offset correction registers | 11-bit twos-complement offset (Reg 0x11/0x12) compensates for PCB trace resistance and noise-induced errors |
| Consecutive fault queue | Configurable 1–4 out-of-limit samples required before ALERT assertion; suppresses transient noise glitches |
| Low-power standby mode | Run/Stop bit disables ADC but retains SMBus access and ALERT/THERM functionality at 5.5 μA |
Applications
| Desktop PC Thermal Management | Notebook CPU Protection |
|---|---|
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 (CPU diode) readings via SMBus to system BIOS or EC. Use Value: Enables dynamic fan speed control and CPU throttling using THERM output, meeting ACPI thermal event requirements with ±1°C remote accuracy. | Use Scenario: Compact thermal supervision in space-constrained notebook platforms where discrete thermal diodes are integrated into GPU/CPU packages. IC Role / Device Role / Timing Role: Remote temperature monitor interfacing with substrate transistors on mobile processors; communicates over shared SMBus with other PMICs/sensors. Use Value: Delivers 0.125°C remote resolution and open-circuit detection to prevent thermal runaway during battery-powered operation. |
| Industrial PLC Controller | Telecom Line Card Monitoring |
Use Scenario: Ambient and field-device junction temperature monitoring in programmable logic controllers operating across −40°C to +85°C industrial range. IC Role / Device Role / Timing Role: Local sensor tracks enclosure temperature while remote channel monitors heatsink-mounted diode on power MOSFETs or IGBTs. Use Value: ±3°C local accuracy and programmable fault queue ensure reliable overtemperature shutdown without nuisance trips in electrically noisy factory environments. | Use Scenario: Thermal safety monitoring on high-density telecom line cards with multiple ASICs generating localized hotspots. IC Role / Device Role / Timing Role: Distributed temperature node reporting to shelf controller via SMBus; THERM output drives local fan zones independently. Use Value: 170 μA operating current and 8-lead SOIC footprint support dense thermal sensor placement without compromising power budget or board area. |
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 (±0.75°C), 1.8 V–5.5 V supply, different SMBus address (0x48), no THERM output | Lacks dedicated fail-safe THERM comparator; relies on software polling or GPIO interrupt | Select when higher remote precision is critical and system firmware can manage thermal response without hardware THERM assertion |
| MAX6642AESA+ | Same 8-pin SOIC, ±2°C remote accuracy, 2-wire interface (not SMBus-compliant), fixed 10°C THERM hysteresis | No SMBus alert protocol support; requires custom driver for interrupt handling | Select for legacy 2-wire systems where SMBus compliance is unnecessary and cost sensitivity outweighs protocol flexibility |
Compared with LM94022QIMME/NOPB and MAX6642AESA+, the ADM1032AR-REEL uniquely combines SMBus alert functionality, programmable THERM hysteresis, and open-circuit detection in a single 8-lead SOIC package-enabling hardware-triggered thermal responses without host processor intervention.
Availability
ADM1032AR-REEL is available at Aetrix Electronics and suitable for desktop computers, industrial controllers, and telecommunications equipment requiring stable component supply and long-term thermal sensor availability.
Supply support for ADM1032AR-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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The ADM1032AR-REEL belongs to Analog Devices' thermal management IC product line, designed specifically for reliable, calibration-free dual-point temperature monitoring in computing and industrial systems with SMBus infrastructure.
FAQ
What is the SMBus address of the ADM1032AR-REEL?
The ADM1032AR-REEL uses a fixed 7-bit SMBus address of 0x4C (1001100b). This differs from the ADM1032-2 variant (0x4D) and is confirmed in the "Addressing the Device" section of the Rev. E datasheet. The address is hardwired and not configurable via pins or registers, ensuring deterministic bus arbitration in multi-device systems.
Does the ADM1032AR-REEL require external calibration for remote temperature sensing?
No, the ADM1032AR-REEL does not require external calibration for remote sensing. Its patented ΔVBE measurement technique cancels the absolute base-emitter voltage (VBE) variation between devices, enabling ±1°C accuracy across 60°C–100°C without per-unit trimming. Offset registers (0x11/0x12) allow fine-tuning for PCB-level errors, but factory calibration is unnecessary.
How does the THERM output of the ADM1032AR-REEL behave during overtemperature events?
The THERM output of the ADM1032AR-REEL is an open-drain comparator that asserts low when either local or remote temperature exceeds its respective THERM limit register value. It remains asserted until both temperatures fall below their limits minus programmed hysteresis (default 10°C). Unlike ALERT, THERM requires no software clearing and operates autonomously, making it ideal for immediate fan activation or CPU throttling.
Can the ADM1032AR-REEL detect if the remote temperature sensor is disconnected?
Yes, the ADM1032AR-REEL includes built-in remote sensor open-circuit detection. When the D+/D− connection is broken, Bit 2 (OPEN1) in the status register (address 0x02) is set high. This flag persists until the sensor is reconnected and a valid reading is acquired, preventing false overtemperature assertions and enabling diagnostic reporting via SMBus reads.
What is the maximum conversion rate supported by the ADM1032AR-REEL?
The ADM1032AR-REEL supports up to 64 conversions per second, achieved by setting the Conversion Rate Register (address 0x04) to 0x0Ah. At this rate, conversion time is 15.3 ms with averaging disabled. Higher rates are not supported; the device's architecture limits full dual-channel measurement to ≤64 Hz, balancing speed against noise rejection and power consumption.
ADM1032AR-REEL 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-REEL FAQ
1.How can I place an order for ADM1032AR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM1032AR-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 ADM1032AR-REEL reliable?
The price and inventory of ADM1032AR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM1032AR-REEL is usually 5 days.
3.What payment methods are accepted for ADM1032AR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM1032AR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM1032AR-REEL?
ADM1032AR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM1032AR-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 ADM1032AR-REEL?
For technical support, including ADM1032AR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM1032AR-REEL requirements.
6.How does Aetrix verify that ADM1032AR-REEL is sourced from the original manufacturer or authorized distributors?
All ADM1032AR-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 ADM1032AR-REEL meets industry standards.
7.What is the process for return or replacement of ADM1032AR-REEL?
All ADM1032AR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM1032AR-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 ADM1032AR-REEL part is unused and in its original packaging.
Return procedure for ADM1032AR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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