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Analog Devices Inc. ADM1020AR-REEL
- Part No.:
- ADM1020AR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Thermal Management
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM1020AR-REEL.pdf
- Description:
- SYSTEM TEMPERATURE MONITOR
- Quantity:
- Payment:
- Shipping:
Inventory:12,500
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Product details
Overview
ADM1020AR-REEL from Analog Devices is an 8-lead SOIC digital thermometer IC with dual-channel temperature sensing (on-chip + remote diode), ±1°C local and ±3°C remote accuracy over –55°C to +125°C, SMBus™-compatible 2-wire interface, and open-drain ALERT output for thermal alarm signaling in PC motherboard and microprocessor thermal management systems.
For engineers reviewing the ADM1020AR-REEL datasheet, ADM1020AR-REEL pinout, ADM1020AR-REEL application, or ADM1020AR-REEL equivalent, key selection considerations include remote sensor bias current (90 µA), conversion rate programmability (0.0625–8 Hz), standby current (≤10 µA), SMBus alert support, and open-circuit remote sensor detection capability.
Technical Context
The ADM1020AR-REEL implements a chopper-stabilized, 65 kHz low-pass filtered ∆VBE measurement architecture to cancel transistor VBE absolute value variation-enabling calibration-free remote diode sensing. It uses dual 8-bit two's complement ADC outputs (1 LSB = 1°C) stored in dedicated local/remote value registers.
Its SMBus slave interface supports address selection via three-state ADD pin (grounded, floating, or VDD-tied), Alert Response Address (ARA = 0x14) arbitration, and dual-port register addressing (separate read/write addresses). The device integrates limit comparison logic, status flag generation (BUSY, LLOW, RHIGH, OPEN), and maskable ALERT output with internal pull-down and external 10 kΩ pull-up requirement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Resolution | 1°C - guaranteed no missed codes across full operating range |
| Local Sensor Accuracy | ±1°C - specified at TA = –55°C to +125°C, enabling precise die-temperature monitoring |
| Remote Sensor Accuracy | ±3°C at +60°C to +100°C - supports Pentium II on-die transistors or discrete 2N3904 |
| Supply Voltage Range | +3.0 V to +5.5 V - compatible with 3.3 V and 5 V system rails without level shifting |
| Standby Current | ≤10 µA - enables ultra-low-power thermal supervision during system sleep states |
| Conversion Rate | Programmable 0.0625–8 conversions/sec - trade-off between update latency and average supply current (42–170 µA) |
| SMBus Clock Frequency | Up to 100 kHz - meets SMBus 1.0/1.1 timing requirements including tSU:STA, tHD:STA, tBUF |
| Remote Sensor Bias | 90 µA high-level D+ source - ensures stable forward bias of remote NPN/PNP diode junctions |
Pinout & Package
ADM1020AR-REEL is housed in an 8-lead Small Outline Integrated Circuit (SOIC) package with standard 1.27 mm pitch, JEDEC MS-012AC footprint, and θJA = 150°C/W thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive power supply input | Accepts +3.0 V to +5.5 V; powers analog front-end, ADC, and SMBus I/O |
| D+ (Pin 2) | Remote sensor emitter/anode connection | Supplies 90 µA bias current; connects to emitter of NPN or anode of PNP diode sensor |
| D– (Pin 3) | Remote sensor base/cathode connection | Biased ~0.7 V above GND via internal diode; rejects ground noise in noisy environments |
| ADD (Pin 4) | Three-state address select input | Samples at power-up only; sets SMBus slave address to 0x4C, 0x4D, or 0x4E |
| GND (Pin 5) | Ground reference | 0 V return for all analog and digital circuitry; must be low-impedance for accurate remote sensing |
| ALERT (Pin 6) | Open-drain interrupt/alert output | Pulls low on out-of-limit condition or remote sensor open-circuit; requires external 10 kΩ pull-up to VDD |
| SDATA (Pin 7) | SMBus bidirectional data line | Open-drain I/O; shares bus with other SMBus slaves; supports SMBus Alert protocol |
| SCLK (Pin 8) | SMBus clock input | Asynchronous master-controlled clock; max 100 kHz; defines timing for data setup/hold windows |
Key Features
| Feature | Design Value |
|---|---|
| No calibration required | ∆VBE measurement technique eliminates per-device VBE offset compensation, reducing BOM and test cost |
| Remote sensor open-circuit detection | Automatically flags D+/D– disconnect via Status Register Bit 2, preventing false thermal shutdown |
| Programmable conversion rate | Eight selectable rates (0.0625–8 Hz) via Conversion Rate Register, enabling dynamic power/performance tuning |
| SMBus Alert compatibility | Supports ARA (0x14) arbitration and automatic device address reporting when ALERT asserts |
| Low-power standby mode | Configurable via RUN/STOP bit; disables ADC while preserving SMBus responsiveness and <10 µA quiescent draw |
| Dual independent limit comparators | Separate high/low thresholds for local and remote channels enable asymmetric thermal trip points per sensor |
Applications
| Desktop Computers | Notebook Computers |
|---|---|
Use Scenario: Real-time CPU die and VRM temperature monitoring on ATX motherboards with Intel Pentium II/III processors. IC Role / Device Role / Timing Role: Dual-channel thermal supervisor providing local (on-die) and remote (VRM heatsink) measurements via SMBus to BIOS/firmware. Use Value: Enables dynamic fan speed control and thermal throttling using factory-programmed limits without host CPU intervention. | Use Scenario: Compact thermal management in space-constrained laptop chassis with discrete NPN transistor sensors on GPU and battery packs. IC Role / Device Role / Timing Role: Low-quiescent-current remote diode monitor interfacing to embedded controller (EC) over shared SMBus. Use Value: Achieves <10 µA standby current during S3/S4 sleep states while maintaining open-circuit fault detection for safety-critical battery monitoring. |
| Smart Batteries | Industrial Controllers |
Use Scenario: Temperature supervision of Li-ion battery packs in portable medical devices requiring UL 2054 compliance. IC Role / Device Role / Timing Role: Remote sensor monitors cell stack temperature; local sensor tracks protection IC junction temperature. Use Value: Provides independent high/low limit alarms per channel to trigger hardware cutoff before thermal runaway thresholds are exceeded. | Use Scenario: DIN-rail mounted PLC modules monitoring ambient cabinet temperature and power supply MOSFET heatsinks. IC Role / Device Role / Timing Role: Standalone thermal watchdog with SMBus alert output wired to PLC's interrupt input for immediate firmware response. Use Value: Eliminates need for external ADC or microcontroller polling by delivering asynchronous fault signaling with <170 ms worst-case conversion time. |
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 | ±0.5°C local accuracy, 12-bit resolution, automotive AEC-Q100 Grade 1, integrated EEPROM for calibration offsets | Targeted at automotive cabin controllers requiring higher precision and extended temp range (–40°C to +150°C) | Select when higher accuracy, EEPROM-based offset correction, or automotive qualification is mandatory |
| MAX6642AESA+ | ±2°C remote accuracy, 10-bit ADC, 2-wire SMBus-compatible interface, 128-byte EEPROM for user configuration | Designed for server DIMM thermal monitoring with tighter remote sensor tolerance and nonvolatile limit storage | Select when DIMM slot integration, EEPROM persistence, or lower remote error at 0°C–70°C is prioritized |
Compared with LM94022QDCNTQ1 and MAX6642AESA+, the ADM1020AR-REEL offers lower system cost through calibration-free operation and simpler register mapping, but trades off resolution and automotive qualification-making it optimal for cost-sensitive PC and industrial embedded thermal supervision where ±1°C local and ±3°C remote accuracy suffices.
Availability
ADM1020AR-REEL is available at Aetrix Electronics and suitable for desktop computers, notebook computers, and industrial controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ADM1020AR-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The ADM1020AR-REEL belongs to Analog Devices' System Thermal Management product line, designed specifically for low-cost, SMBus-based thermal monitoring in personal computing platforms and embedded systems with strict power and board-space constraints.
FAQ
What is the operating temperature range of the ADM1020AR-REEL?
The ADM1020AR-REEL operates across –55°C to +125°C, with specified accuracy for the on-chip sensor (±1°C) and remote sensor (±3°C at +60°C to +100°C). Its absolute maximum junction temperature is +150°C, and it is rated for storage from –65°C to +150°C. The ADM1020AR-REEL ordering option specifies a 0°C to +85°C ambient temperature range for the packaged device.
Does the ADM1020AR-REEL require external calibration for remote diode sensing?
No, the ADM1020AR-REEL does not require external calibration. It uses a ∆VBE measurement technique that cancels the absolute base-emitter voltage variation across transistors, enabling accurate remote temperature readings from discrete NPN (e.g., 2N3904) or on-die PNP sensors without trimming. This feature is intrinsic to the ADM1020AR-REEL design and documented in its functional description.
How does the ALERT output function on the ADM1020AR-REEL?
The ALERT output on the ADM1020AR-REEL is an open-drain signal that pulls low when any of the following occurs: local or remote temperature exceeds programmed high/low limits, or the remote sensor is open-circuited. It requires an external 10 kΩ pull-up resistor to VDD and supports both general-purpose interrupt signaling and SMBus Alert protocol via Alert Response Address (0x14). The ADM1020AR-REEL status register bits control latching behavior.
Can multiple ADM1020AR-REEL devices share the same SMBus?
Yes, up to three ADM1020AR-REEL devices can coexist on a single SMBus using the ADD pin to configure distinct slave addresses (0x4C, 0x4D, or 0x4E). The ADD pin state is sampled only at power-up, so address selection must be fixed before initialization. Each ADM1020AR-REEL retains independent register sets and ALERT outputs, enabling multi-zone thermal monitoring without address conflict.
What is the minimum conversion rate supported by the ADM1020AR-REEL?
The ADM1020AR-REEL supports a minimum conversion rate of 0.0625 conversions per second (16-second interval), achieved by writing 0x00 to the Conversion Rate Register. At this rate, average supply current drops to 42 µA (typical at VDD = 3.3 V), making the ADM1020AR-REEL suitable for battery-backed or ultra-low-power thermal supervision where infrequent updates are acceptable.
ADM1020AR-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
- Function:
- Temperature Monitor
- Sensor Type:
- Internal and External
- Sensing Temperature:
- -
- Accuracy:
- ±1°C
- Topology:
- ADC
- Output Type:
- SMBus
- Output Alarm:
- Yes
- Output Fan:
- No
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADM1020AR-REEL FAQ
1.How can I place an order for ADM1020AR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM1020AR-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 ADM1020AR-REEL reliable?
The price and inventory of ADM1020AR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM1020AR-REEL is usually 5 days.
3.What payment methods are accepted for ADM1020AR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM1020AR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM1020AR-REEL?
ADM1020AR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM1020AR-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 ADM1020AR-REEL?
For technical support, including ADM1020AR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM1020AR-REEL requirements.
6.How does Aetrix verify that ADM1020AR-REEL is sourced from the original manufacturer or authorized distributors?
All ADM1020AR-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 ADM1020AR-REEL meets industry standards.
7.What is the process for return or replacement of ADM1020AR-REEL?
All ADM1020AR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM1020AR-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 ADM1020AR-REEL part is unused and in its original packaging.
Return procedure for ADM1020AR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADM1020AR-REEL Tags
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