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Analog Devices Inc./Maxim Integrated MAX6581TG9A+
- Part No.:
- MAX6581TG9A+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog and Digital Output
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
MAX6581TG9A+.pdf
- Description:
- SENSOR DIGITAL -40C-125C 24TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:319
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Product details
Overview
MAX6581TG9A+ from Analog Devices is an 8-channel precision temperature sensor IC that monitors one local die temperature and up to seven remote diode-connected transistors, delivering 11-bit (0.125°C) resolution, ±1°C max accuracy from +60°C to +100°C on remote channels, and programmable ALERT/OVERT thresholds for thermal management in high-density computing systems.
For engineers reviewing the MAX6581TG9A+ datasheet, MAX6581TG9A+ pinout, MAX6581TG9A+ application, or MAX6581TG9A+ equivalent, this device supports SMBus/I²C-compatible communication, resistance cancellation across all remote channels, dual open-drain alarm outputs, and operates from -40°C to +125°C in a 24-pin 4mm × 4mm TQFN-EP package - critical for server thermal monitoring, CPU/GPU junction sensing, and multi-zone board-level temperature control.
Technical Context
The MAX6581TG9A+ implements a dedicated ADC per channel with sequential conversion (Ch1 → Ch2 → Local → Ch3–Ch7), supporting both normal and resistance-cancellation (RC) modes that double conversion time (190–312 ms vs. 95–156 ms) but compensate for PCB trace resistance up to 50Ω. Its internal current sources (8–240 µA, selectable per channel) drive remote diodes with programmable ideality factor and offset correction.
It features dual independent alert architectures: ALERT responds to any channel crossing user-defined high/low thresholds (including local), while OVERT asserts only on remote-channel overtemperature events exceeding dedicated OVERT registers; both outputs are active-low, open-drain, and retain status in nonvolatile registers accessible via SMBus read-byte protocol.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 8 total: 1 local (die) + 7 remote (diode-connected transistors) |
| Resolution | 11-bit (0.125°C LSB); extended resolution requires reading high- and low-byte registers |
| Remote Accuracy | ±1°C max (3σ) from +60°C to +100°C; ±2.5°C at +100°C to +150°C |
| Temperature Range | Remote: -64°C to +150°C; Local: -40°C to +125°C; Operating ambient: -40°C to +125°C |
| Interface | SMBus/I²C-compatible: supports write/read/send/receive byte protocols; slave address 0x9A |
| Supply | 3.0V to 3.6V; standby current 4–15 µA; operating current 500–650 µA (RC mode dependent) |
| Alarm Outputs | Two open-drain outputs: ALERT (multi-threshold interrupt) and OVERT (remote-only overtemp) |
Pinout & Package
MAX6581TG9A+ is housed in a 24-pin, 4mm × 4mm thin quad flat no-lead package with exposed pad (TQFN-EP), requiring EP soldered to GND for thermal and electrical performance. Pin 1 is DXP2; pins 6 and 22 are no-connect; pin 15 (I.C.) is internally connected to VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DXP1–DXP7, DXN1–DXN7 | Remote diode interface pairs (anode/cathode) | Each pair drives and senses a separate transistor-based remote temperature node; RC mode enabled per channel via register 4A |
| VCC, GND, EP | Power and ground terminals | VCC requires 0.1µF bypass to GND; EP must be connected to GND for thermal dissipation (θJC = 3.0°C/W) |
| SMBCLK, SMBDATA | SMBus serial interface | Supports 400kHz clock; pull-up resistors required; timing compliant with SMBus v2.0 (tBUF = 1.6µs, tSU:DAT = 100ns) |
| ALERT, OVERT | Open-drain alarm outputs | Active-low; sink up to 6mA; require external pull-ups; OVERT ignores local channel, ALERT includes it |
| STBY | Hardware standby enable | Logic-low entry to hardware standby (SMBus inactive, ICC ≈ 4µA); retains register data |
Key Features
| Feature | Design Value |
|---|---|
| Resistance cancellation | Compensates for series resistance up to 50Ω on remote diode traces, eliminating measurement error without external calibration |
| Diode fault detection | Automatically identifies open/short faults on any DXP/DXN pair within ~4ms and flags status without asserting alarms |
| Programmable ideality & offset | Per-channel transistor ideality factor (1.000–1.016) and ±63.875°C offset correction via registers 4B–4E |
| Dual alert architecture | Independent ALERT (all channels, high/low thresholds) and OVERT (remote-only, high threshold only) outputs simplify system-level thermal response logic |
| SMBus timeout recovery | Auto-resets interface if SMBDATA remains low >25–45ms, preventing bus lockup in noisy environments |
Applications
| Server CPU Thermal Monitoring | Data Center Power Supply Units |
|---|---|
Use Scenario: Real-time junction temperature tracking of multi-core CPUs and GPUs across multiple dies using embedded substrate PNPs. IC Role / Device Role / Timing Role: Local channel measures die temperature; remote channels monitor VRM hotspots, memory controllers, and I/O die junctions via dedicated diode inputs. Use Value: Enables dynamic fan speed control and throttling decisions with ±1°C accuracy in the critical +60°C to +100°C range where thermal runaway risk peaks. |
Use Scenario: Continuous thermal supervision of high-efficiency DC-DC converters and MOSFET banks in modular PSUs. IC Role / Device Role / Timing Role: Remote channels sense heatsink baseplates and FET case temperatures; ALERT triggers derating before OVERT initiates shutdown. Use Value: Resistance cancellation ensures accurate readings despite long PCB traces between sensing points and the MAX6581TG9A+, avoiding false trips. |
| Enterprise Storage Controller Boards | High-Performance Workstation Motherboards |
Use Scenario: Multi-zone temperature mapping across SAS/SATA controller ASICs, PCIe switches, and NAND flash modules. IC Role / Device Role / Timing Role: One MAX6581TG9A+ replaces multiple single-channel sensors; remote channels assigned to ASIC junctions, local channel tracks ambient near controller die. Use Value: Reduces BOM count and layout area while maintaining individual channel programmability - each remote threshold set independently for zone-specific limits. |
Use Scenario: Compact thermal management for dual-CPU, quad-GPU workstations with dense component placement and limited airflow. IC Role / Device Role / Timing Role: Local channel monitors chipset temperature; remote channels track GPU VRMs, CPU socket thermals, and M.2 SSDs using discrete diodes. Use Value: Dual open-drain outputs allow hierarchical response: ALERT interrupts host firmware for logging, while OVERT directly gates power rails or fans without software latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel temperature monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6642AATA+ | 2-channel (1 local + 1 remote), 12-bit resolution, no resistance cancellation, SMBus address 0x48/0x49 | Limited to dual-point monitoring; lacks remote-diode fault detection and extended temperature registers | Select when only two thermal zones require monitoring and PCB space is constrained |
| ADT7481ARMZ-REEL | 8-channel (1 local + 7 remote), 11-bit, ±1°C accuracy, but uses SPI interface and lacks OVERT output | Requires SPI host interface; no dedicated overtemperature hardware output - relies on software polling or GPIO emulation | Choose when system already uses SPI peripherals and firmware can manage alarm state without hardware interrupt latency |
Compared with MAX6581TG9A+, MAX6642AATA+ reduces channel count and diagnostic capability but simplifies design for basic dual-sensor needs, while ADT7481ARMZ-REEL matches channel count and accuracy but trades SMBus compatibility and dual-alarm hardware for SPI flexibility - neither offers resistance cancellation or identical register-level SMBus command structure.
Availability
MAX6581TG9A+ is available at Aetrix Electronics and suitable for server thermal management, enterprise storage controller boards, and high-performance workstation motherboards requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6581TG9A+ 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 industrial, automotive, communications, and computing markets since 1965.
The MAX6581TG9A+ belongs to Analog Devices' precision temperature sensor product line, engineered specifically for multizone thermal monitoring in space-constrained, high-reliability computing platforms where accuracy, remote-diode compensation, and SMBus interoperability are essential.
FAQ
What is the SMBus slave address for MAX6581TG9A+?
The MAX6581TG9A+ has a fixed SMBus slave address of 0x9A (7-bit address). This is distinct from other variants in the MAX6581 family (e.g., MAX6581TG9C+ uses 0x9C). The address is hardwired and not configurable via pins or registers, ensuring deterministic bus arbitration in multi-device systems where MAX6581TG9A+ shares the same SMBus segment with other sensors.
Does MAX6581TG9A+ support resistance cancellation on the local temperature channel?
No, MAX6581TG9A+ applies resistance cancellation only to the seven remote diode channels (DXP1–DXP7/DXN1–DXN7). The local temperature channel measures the IC's own die temperature using an internal thermal diode and does not use external traces or series resistance - hence cancellation is not applicable or implemented for the local channel in MAX6581TG9A+.
How does the MAX6581TG9A+ handle diode fault detection and reporting?
MAX6581TG9A+ continuously monitors each remote DXP/DXN pair for open or short conditions. Upon detection (~4ms latency), it sets the corresponding bit in the Diode Fault Status register (address 0x46) and writes 0xFF to the associated temperature register. Neither ALERT nor OVERT asserts during a fault, preserving alarm integrity - allowing firmware to distinguish between true overtemperature and sensor failure in MAX6581TG9A+ deployments.
Can MAX6581TG9A+ operate with a 2.5V supply voltage?
No, MAX6581TG9A+ requires a minimum supply voltage of 3.0V and is specified only for operation between 3.0V and 3.6V. Operation below 3.0V violates the absolute maximum ratings and may cause undefined behavior, including inaccurate temperature readings, failed SMBus communication, or failure to assert ALERT/OVERT outputs. The undervoltage lockout (UVLO) threshold is 2.25–2.95V, disabling the ADC below this range.
What is the purpose of the I.C. pin (pin 15) on MAX6581TG9A+?
The I.C. pin on MAX6581TG9A+ is internally connected to VCC and serves no external function. It may be left unconnected or tied to VCC - either configuration is electrically identical. This pin exists for mechanical symmetry in the TQFN-EP package and does not affect MAX6581TG9A+ functionality, power delivery, or thermal performance; it is not a test point or auxiliary supply rail.
MAX6581TG9A+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Sensor Type:
- Digital, Local/Remote
- Sensing Temperature - Local:
- -40°C ~ 125°C
- Sensing Temperature - Remote:
- -64°C ~ 150°C
- Output Type:
- I2C/SMBus
- Voltage - Supply:
- 3V ~ 3.6V
- Resolution:
- 8 b (Local), 11 b (Remote)
- Features:
- Output Switch, Programmable Limit, Standby Mode
- Accuracy - Highest (Lowest):
- ±1.5°C (±3.5°C)
- Test Condition:
- 30°C ~ 85°C (0°C ~ 150°C)
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 24-TQFN (4x4)
MAX6581TG9A+ FAQ
1.How can I place an order for MAX6581TG9A+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6581TG9A+ 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 MAX6581TG9A+ reliable?
The price and inventory of MAX6581TG9A+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6581TG9A+ is usually 5 days.
3.What payment methods are accepted for MAX6581TG9A+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6581TG9A+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6581TG9A+?
MAX6581TG9A+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6581TG9A+ 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 MAX6581TG9A+?
For technical support, including MAX6581TG9A+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6581TG9A+ requirements.
6.How does Aetrix verify that MAX6581TG9A+ is sourced from the original manufacturer or authorized distributors?
All MAX6581TG9A+ 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 MAX6581TG9A+ meets industry standards.
7.What is the process for return or replacement of MAX6581TG9A+?
All MAX6581TG9A+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6581TG9A+, 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 MAX6581TG9A+ part is unused and in its original packaging.
Return procedure for MAX6581TG9A+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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