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Analog Devices Inc. ADT7481ARMZ
- Part No.:
- ADT7481ARMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog and Digital Output
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADT7481ARMZ.pdf
- Description:
- SERIAL SWITCH/DIGITAL SENSOR, 8
- Quantity:
- Payment:
- Shipping:
Inventory:975
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Product details
Overview
ADT7481ARMZ from Analog Devices is a dual remote + local digital temperature sensor IC with SMBus interface, ±1°C accuracy (0°C to +70°C) on remote channels, 0.25°C resolution for remote diode sensing, and dual open-drain THERM outputs for thermal fail-safe control in PC and embedded thermal management systems.
For engineers reviewing the ADT7481ARMZ datasheet, ADT7481ARMZ pinout, ADT7481ARMZ application, or ADT7481ARMZ equivalent, key selection considerations include remote diode measurement accuracy across −55°C to +150°C, programmable extended range (−64°C to +191°C), SMBus address 0x4C, dual THERM/ALERT functionality, and 10-lead MSOP package compatibility with thermal diode-based CPU/GPU monitoring.
Technical Context
The ADT7481ARMZ integrates a 11-bit A-to-D converter, analog multiplexer, and digital register bank to simultaneously digitize local ambient temperature and two external thermal diodes using ΔVBE measurement at two switched currents (I and N×I). It supports both binary and offset-binary data formats depending on selected temperature range.
Its SMBus-compliant serial interface enables configuration of conversion rate (0.0625–64 Hz), channel selection (round-robin/all or single-channel), averaging enable/disable, and THERM/ALERT pin reassignment via Configuration Register 1 (0x03/0x09). Fault detection includes remote diode open-circuit reporting and automatic status flag generation on limit violations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Channels | 1 local + 2 remote diode inputs - enables simultaneous CPU, GPU, and board ambient monitoring |
| Remote Accuracy | ±1°C (0°C to +70°C) - meets tight thermal throttling requirements for desktop/notebook CPUs |
| Remote Resolution | 0.25°C - supports fine-grained fan speed ramping and dynamic thermal management |
| SMBus Address | 0x4C (default) - ensures interoperability with standard system management controllers without address conflict |
| Operating Current | 240 μA typical at 0.0625 conv/sec - enables low-power thermal monitoring in always-on subsystems |
| Standby Current | 5 μA - allows deep-sleep thermal supervision without significant battery drain in smart batteries |
| Package | 10-lead MSOP (3 mm × 3 mm) - provides compact footprint for space-constrained motherboard and industrial controller layouts |
Pinout & Package
ADT7481ARMZ is housed in a 10-lead MSOP package (θJA = 142°C/W) with exposed pad for thermal performance. Pin functions are validated per Analog Devices Rev. 0 datasheet Figure 3 and Table 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | 3.0 V to 3.6 V operation - compatible with standard 3.3 V logic rails and avoids level-shifting overhead |
| D1+/D1− (Pins 2,3) | Remote diode 1 sensing terminals | Differential connection to CPU-integrated or discrete PNP transistor - rejects common-mode noise up to 100 mV |
| THERM (Pin 4) | Open-drain overtemperature comparator output | Direct fan ON/OFF control or CPU clock throttling signal - requires external pull-up; active-low assertion |
| GND (Pin 5) | Supply ground reference | Common return for analog and digital sections - must be low-impedance to minimize measurement error |
| D2+/D2− (Pins 7,6) | Remote diode 2 sensing terminals | Independent second thermal path - supports GPU or VRM temperature monitoring without shared signal crosstalk |
| ALERT/THERM2 (Pin 8) | Configurable open-drain interrupt/THERM output | Reprogrammable as second fail-safe output - enables dual-threshold response (e.g., warning + shutdown) |
| SDATA (Pin 9) | SMBus bidirectional data line | Open-drain I/O with 5 pF max capacitance - supports 400 kHz bus speed and complies with SMBus timeout spec |
| SCLK (Pin 10) | SMBus clock input | Asynchronous timing reference - tolerates 400 kHz max frequency with 4.7 μs min low period |
Key Features
| Feature | Design Value |
|---|---|
| Extended temperature range mode | −64°C to +191°C via Config Register Bit 2 - supports burn-in testing and automotive under-hood applications beyond standard PC ranges |
| Programmable THERM limits | Separate high/low/THERM thresholds per channel - enables hierarchical thermal response (e.g., alert → fan ramp → shutdown) |
| Offset calibration registers | Per-channel offset adjustment (±127°C range) - corrects system-level thermal gradients and PCB trace resistance errors |
| Dual independent THERM outputs | Pin 4 (fixed) + Pin 8 (reconfigurable) - eliminates need for external logic to implement redundant fail-safe paths |
| Remote diode fault detection | Automatic open-circuit reporting - prevents false thermal shutdown during sensor disconnection or solder joint failure |
Applications
| Desktop PC Thermal Management | Notebook CPU/GPU Monitoring |
|---|---|
|
Use Scenario: Real-time thermal supervision of CPU die, GPU junction, and motherboard ambient in ATX form factor systems. IC Role / Device Role / Timing Role: Local sensor measures IC junction temperature; Remote 1 and 2 monitor CPU and GPU thermal diodes via dedicated D+/D− pairs. Use Value: Enables dynamic fan speed control and processor throttling with ±1°C accuracy, reducing acoustic noise while preventing thermal runaway. |
Use Scenario: Compact thermal protection in space-constrained notebook platforms with integrated graphics and multi-core processors. IC Role / Device Role / Timing Role: Dual remote channels track CPU and GPU diode voltages; local sensor monitors chipset temperature near VRMs. Use Value: 0.25°C resolution allows precise duty-cycle modulation of ultra-quiet fans, extending battery life during light workloads. |
| Industrial PLC Controller Cooling | Smart Battery Pack Safety |
|
Use Scenario: Overtemperature protection for programmable logic controller cabinets operating in unconditioned factory environments. IC Role / Device Role / Timing Role: Remote 1 monitors heatsink temperature; Remote 2 tracks power module junction; local sensor checks ambient air intake. Use Value: Dual THERM outputs drive independent cooling fans and safety relays - meets IEC 61508 functional safety requirements for thermal shutdown. |
Use Scenario: Cell-level temperature monitoring in lithium-ion battery packs for portable medical devices and power tools. IC Role / Device Role / Timing Role: Local sensor reads pack ambient; Remote 1 and 2 monitor top/bottom cell strings using discrete diode-connected transistors. Use Value: 5 μA standby current enables continuous thermal vigilance during storage; programmable limits prevent charging above safe thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual remote temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADT7481ARMZ-1 | SMBus address 0x4B instead of 0x4C - identical electrical specs, pinout, and register map | Required when multiple ADT7481 devices share same SMBus segment - avoids address collision in multi-zone thermal systems | Select ADT7481ARMZ-1 only when bus addressing conflicts arise; otherwise use standard ADT7481ARMZ for default 0x4C compatibility. |
| MAX6642AESA+ | Single remote + local sensor; 16-pin SOIC package; ±2°C remote accuracy; no extended range mode | Limited to CPU-only monitoring; lacks second remote channel and −64°C to +191°C range needed for burn-in or automotive use | Choose MAX6642AESA+ only for cost-sensitive, single-diode applications where dual remote capability and wide range are unnecessary. |
Compared with ADT7481ARMZ, the ADT7481ARMZ-1 offers identical functionality with a different SMBus address for multi-device configurations, while the MAX6642AESA+ provides lower channel count and reduced accuracy at lower cost - making it suitable only for simpler thermal monitoring tasks without fail-safe redundancy or extended range needs.
Availability
ADT7481ARMZ is available at Aetrix Electronics and suitable for desktop computers, industrial controllers, and smart batteries requiring stable component supply, long-term lifecycle support, and guaranteed thermal accuracy across extended temperature ranges.
Supply support for ADT7481ARMZ 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, serving precision instrumentation, industrial automation, and communications markets since 1965.
The ADT7481ARMZ belongs to Analog Devices' thermal management IC product line, engineered specifically for reliable, high-accuracy multi-point temperature monitoring in PC, server, and industrial embedded systems with SMBus integration.
FAQ
What is the SMBus address of the ADT7481ARMZ?
The ADT7481ARMZ has a fixed SMBus address of 0x4C. This is hardwired and cannot be changed via software or hardware pins. An alternative variant, ADT7481ARMZ-1, uses address 0x4B for multi-device bus configurations. Both variants share identical functionality, timing, and register maps - only the address differs. Always verify address assignment in system schematics before firmware integration.
Does the ADT7481ARMZ support measurement of discrete transistors as remote sensors?
Yes, the ADT7481ARMZ supports discrete PNP transistors configured as diode-connected devices (base tied to collector) on both D1+ / D1− and D2+ / D2− inputs. The internal bias circuitry compensates for leakage and common-mode noise, enabling accurate readings even with non-integrated diodes. Characterization data confirms ±1°C accuracy across −55°C to +150°C for properly biased discrete sensors.
How does the ADT7481ARMZ handle remote diode open-circuit faults?
The ADT7481ARMZ continuously monitors D+/D− voltage differentials and asserts the ALERT output if an open-circuit condition is detected on either remote channel. This fault is latched in the status register and persists until cleared by host software. No external components are required - the detection logic is fully integrated and operates independently of temperature measurement cycles.
Can the ADT7481ARMZ operate in the extended temperature range without external calibration?
Yes, the ADT7481ARMZ supports the −64°C to +191°C extended range natively via Configuration Register Bit 2, with no external calibration required. However, actual measurable range remains limited by the thermal diode's physical characteristics - most discrete or integrated diodes are rated only to −55°C to +150°C. The IC's internal registers and data format (offset binary) automatically adapt to the selected range.
What is the maximum recommended capacitance on D+ and D− lines for the ADT7481ARMZ?
The ADT7481ARMZ datasheet specifies a maximum recommended capacitance of 1000 pF on each D+ and D− line to maintain measurement accuracy. Exceeding this value increases susceptibility to noise-induced errors, particularly at higher frequencies - Figure 8 shows temperature error rising sharply beyond 20 nF. Use short, shielded traces and avoid routing near switching nodes to stay within this limit.
ADT7481ARMZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Sensor Type:
- Digital, Local/Remote
- Sensing Temperature - Local:
- 0°C ~ 127°C
- Sensing Temperature - Remote:
- -64°C ~ 191°C
- Output Type:
- SMBus
- Voltage - Supply:
- 3V ~ 3.6V
- Resolution:
- -
- Features:
- One-Shot, Output Switch, Programmable Limit, Standby Mode
- Accuracy - Highest (Lowest):
- ±1°C (±2.5°C)
- Test Condition:
- 0°C ~ 70°C (-40°C ~ 100°C)
- Operating Temperature:
- -40°C ~ 120°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 10-MSOP
ADT7481ARMZ FAQ
1.How can I place an order for ADT7481ARMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADT7481ARMZ 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 ADT7481ARMZ reliable?
The price and inventory of ADT7481ARMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADT7481ARMZ is usually 5 days.
3.What payment methods are accepted for ADT7481ARMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADT7481ARMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADT7481ARMZ?
ADT7481ARMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADT7481ARMZ 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 ADT7481ARMZ?
For technical support, including ADT7481ARMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADT7481ARMZ requirements.
6.How does Aetrix verify that ADT7481ARMZ is sourced from the original manufacturer or authorized distributors?
All ADT7481ARMZ 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 ADT7481ARMZ meets industry standards.
7.What is the process for return or replacement of ADT7481ARMZ?
All ADT7481ARMZ units undergo pre-shipment inspection (PSI). If there is an issue with ADT7481ARMZ, 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 ADT7481ARMZ part is unused and in its original packaging.
Return procedure for ADT7481ARMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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