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Analog Devices Inc./Maxim Integrated MAX6642ATT90+T
- Part No.:
- MAX6642ATT90+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog and Digital Output
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
MAX6642ATT90+T.pdf
- Description:
- SENSOR DIGITAL -40C-125C 6TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,141
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Product details
Overview
The MAX6642ATT90+T from Analog Devices is a precision dual-zone SMBus-compatible digital temperature sensor that measures both its own die temperature (local) and a remote PN junction (e.g., CPU/GPU substrate PNP or discrete diode-connected transistor), with ±1°C remote accuracy from +60°C to +100°C, 0.25°C resolution, and autonomous 4Hz conversion rate - deployed in server thermal management, GPU monitoring, and high-density computing systems.
For engineers reviewing the MAX6642ATT90+T datasheet, MAX6642ATT90+T pinout, MAX6642ATT90+T application, or MAX6642ATT90+T equivalent, key selection considerations include SMBus address (1001000b), TDFN-6EP package thermal performance, ALERT interrupt latching behavior, and remote diode ideality factor compensation requirements.
Technical Context
The MAX6642ATT90+T integrates a dual-channel integrating ADC with 60ms integration time per channel for robust noise rejection, automatically sequencing local and remote diode measurements using switched current sources (80–120µA high-level, 8–12µA low-level). Its SMBus interface supports Write Byte, Read Byte, Send Byte, and Receive Byte protocols with 100kHz clock, 20–40ms timeout, and alert response address 0x18.
It implements fault detection on DXP (open/short-to-rail), a two-fault queue for ALERT assertion, programmable THIGH thresholds (+70°C local / +120°C remote at POR), and configurable modes including single-shot trigger and external-only (8Hz) operation - all while maintaining <10µA standby current and operating across –40°C to +125°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Remote Accuracy | ±1°C max error between +60°C and +100°C - enables reliable CPU/GPU overtemperature protection without calibration. |
| Local Accuracy | ±2°C from +60°C to +100°C - sufficient for board-level thermal margining and ambient reference. |
| Resolution | 0.25°C (10-bit format) - achieved via extended register (0x10/0x11), supporting fine-grained thermal throttling decisions. |
| Conversion Rate | 4Hz (dual-channel free-run) or 8Hz (remote-only) - balances update latency and power in real-time thermal control loops. |
| Supply Range | +3.0V to +5.5V - compatible with standard 3.3V and 5V system rails without level-shifting. |
| SMBus Address | Fixed 7-bit address 0x48 (1001000b) - eliminates I²C address conflicts in multi-sensor systems. |
| Operating Temp | –40°C to +125°C ambient - qualified for industrial and server chassis environments. |
| Remote Range | 0°C to +150°C - supports GPU and ASIC die monitoring beyond typical ambient limits. |
Pinout & Package
The MAX6642ATT90+T is housed in a 3mm × 3mm, 6-pin TDFN package with exposed pad (EP), optimized for low thermal mass and PCB heat sinking. The EP is internally connected to GND and must be soldered to a dedicated ground plane for optimal thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Power supply input | Accepts +3.0V to +5.5V; requires 0.1µF bypass capacitor to GND; 47Ω series resistor recommended for EMI filtering. |
| 2 - GND | Ground reference | Primary return path for analog and digital circuits; connects to EP for thermal conduction and noise reduction. |
| 3 - DXP | Remote diode bias & sense node | Supplies switched current (8–120µA) to remote PN junction; requires 2200pF capacitor to GND for high-frequency noise suppression. |
| 4 - SCLK | SMBus clock input | Open-drain compatible; tolerates up to +5.5V regardless of VCC; defines timing for all serial transactions. |
| 5 - SDA | SMBus data I/O | Open-drain bidirectional line; shares bus with other SMBus devices; pulled up externally to VCC or +5.5V. |
| 6 - ALERT | Open-drain interrupt output | Asserts low when local or remote temperature exceeds programmed THIGH; supports wired-OR fault signaling across multiple sensors. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-zone autonomous sensing | Simultaneous local die and remote junction measurement with no host intervention - reduces firmware overhead in thermal control stacks. |
| Configurable ALERT fault queue | Two-consecutive-fault requirement (via CONFIG bit 4) prevents false alarms from transient noise spikes in electrically noisy server environments. |
| Diode continuity fault detection | Automatically identifies DXP open-circuit or short-to-rail conditions and flags OPEN bit in status register - avoids invalid temperature reporting in field-deployed systems. |
| Low-power standby mode | Reduces supply current to <10µA while retaining SMBus responsiveness - ideal for always-on thermal monitoring in energy-sensitive edge devices. |
| Integrated 60ms integrating ADC | Rejects 50/60Hz power-supply hum and low-frequency interference - ensures stable readings near switching regulators and VRMs. |
Applications
| Server CPU Thermal Monitoring | GPU Die Temperature Control |
|---|---|
Use Scenario: Real-time tracking of multi-core CPU die temperature in 1U rack servers during sustained compute loads. IC Role / Device Role / Timing Role: Local sensor monitors SoC package temperature; remote channel reads integrated thermal diode on CPU die via DXP connection. Use Value: Enables dynamic frequency scaling and fan speed control with ±1°C remote accuracy, preventing thermal throttling instability caused by coarse-resolution sensors. | Use Scenario: Closed-loop thermal management of discrete graphics cards under gaming or AI inference workloads. IC Role / Device Role / Timing Role: Remote channel interfaces with GPU's substrate PNP diode; ALERT triggers immediate GPU clock down upon crossing +95°C threshold. Use Value: 0.25°C resolution allows precise trip-point tuning, reducing unnecessary performance loss while ensuring silicon reliability at +150°C junction limits. |
| Industrial Embedded Controller | High-Density Storage Enclosure |
Use Scenario: Ambient and component-level temperature supervision in fanless industrial PLCs operating from –40°C to +85°C. IC Role / Device Role / Timing Role: Local channel tracks internal controller die temperature; remote channel monitors power MOSFET heatsink via discrete 2N3906 diode-connected transistor. Use Value: TDFN-6EP package and –40°C to +125°C rating ensure long-term stability in unventilated enclosures without forced airflow. | Use Scenario: Per-bay thermal supervision in 24-bay JBOD storage arrays where drive bay temperatures vary significantly. IC Role / Device Role / Timing Role: One MAX6642ATT90+T per backplane zone monitors local PCB temperature and remote diode on SAS expander IC. Use Value: SMBus address 0x48 and open-drain ALERT allow daisy-chained fault reporting to a single BMC interrupt line, minimizing GPIO usage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar remote/local temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM95235CIMM/NOPB | 11-bit resolution (0.0625°C), SPI interface only, no SMBus support, ±1.5°C remote accuracy over same range | Requires SPI host interface and custom driver stack; lacks ALERT interrupt latching and fault queue | Choose when higher resolution is critical and SMBus infrastructure is unavailable. |
| ADT7490ARMZ-REEL | 3-channel (2 remote + 1 local), ±0.75°C remote accuracy, 12-bit resolution, same SMBus interface and 6-TDFN package | Supports dual remote diodes (e.g., CPU + VRM); higher accuracy but larger footprint due to internal thermal diode calibration | Choose when monitoring multiple hotspots with identical interface and layout compatibility is required. |
Compared with LM95235CIMM/NOPB and ADT7490ARMZ-REEL, the MAX6642ATT90+T offers the tightest SMBus integration, lowest standby current (<10µA), and simplest fault-handling logic - making it optimal for space-constrained, low-power server and embedded thermal subsystems where deterministic interrupt behavior is essential.
Availability
The MAX6642ATT90+T is available at Aetrix Electronics and suitable for server thermal management, GPU die monitoring, and industrial embedded controller applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6642ATT90+T 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, serving industrial, automotive, communications, and healthcare markets with precision sensing and power solutions.
The MAX6642ATT90+T belongs to Analog Devices' precision temperature sensor product line, engineered specifically for high-reliability dual-zone thermal monitoring in compute-intensive systems where SMBus compatibility, remote diode accuracy, and interrupt-driven fault response are critical design requirements.
FAQ
What is the SMBus address of the MAX6642ATT90+T?
The MAX6642ATT90+T has a fixed 7-bit SMBus address of 0x48 (binary 1001000), determined by its ATT90 suffix. This address is hardwired and cannot be changed via pins or registers. It is distinct from other variants in the MAX6642 family (e.g., MAX6642ATT92+T uses 0x49). The device also responds to the SMBus alert response address 0x18 for fault identification in multi-sensor systems.
How does the MAX6642ATT90+T handle remote diode faults?
The MAX6642ATT90+T continuously monitors the DXP pin for open-circuit or short-to-rail conditions. If detected, it sets the OPEN bit (bit 2) in the status register and loads 0xFF into the remote temperature register. The ALERT output is not asserted for diode faults alone - only for temperature threshold violations. Fault status is cleared by reading the status register after the condition resolves or by power-on reset.
Can the MAX6642ATT90+T measure temperatures above +125°C?
Yes - the MAX6642ATT90+T measures remote junction temperatures from 0°C to +150°C, though its specified remote accuracy of ±1°C applies only between +60°C and +100°C. Outside that range, remote error increases to ±3.0°C (0°C to +125°C) and ±3.5°C (+125°C to +150°C). The local die sensor operates from –40°C to +125°C ambient, with ±2°C accuracy in the +60°C to +100°C range.
What is the purpose of the 2200pF capacitor on the DXP pin of the MAX6642ATT90+T?
The 2200pF capacitor between DXP and GND serves as high-frequency noise filtering for the remote diode measurement path. It suppresses EMI-induced errors - particularly from switching regulators and clock harmonics - which otherwise cause temperature overreads of +1°C to +10°C. Analog Devices specifies this value based on the MAX6642ATT90+T's switched current source rise time; values exceeding 3300pF may introduce measurement inaccuracies.
Does the MAX6642ATT90+T support single-shot temperature conversions?
Yes - the MAX6642ATT90+T supports single-shot mode via the command byte 0x0F. Issuing this command forces an immediate dual-channel conversion, regardless of the RUN bit setting in the configuration register. If the device is in standby (RUN = 1), it exits standby, performs the conversion, and returns to standby. In autonomous mode (RUN = 0), the command is ignored since conversions are already running continuously.
MAX6642ATT90+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Sensor Type:
- Digital, Local/Remote
- Sensing Temperature - Local:
- -40°C ~ 125°C
- Sensing Temperature - Remote:
- 0°C ~ 150°C
- Output Type:
- SMBus
- Voltage - Supply:
- 3V ~ 5.5V
- Resolution:
- 10 b
- Features:
- One-Shot, Output Switch, Programmable Limit, Standby Mode
- Accuracy - Highest (Lowest):
- ±2°C (±3°C)
- Test Condition:
- 60°C ~ 100°C (0°C ~ 125°C)
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 6-TDFN (3x3)
MAX6642ATT90+T FAQ
1.How can I place an order for MAX6642ATT90+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6642ATT90+T 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 MAX6642ATT90+T reliable?
The price and inventory of MAX6642ATT90+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6642ATT90+T is usually 5 days.
3.What payment methods are accepted for MAX6642ATT90+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6642ATT90+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6642ATT90+T?
MAX6642ATT90+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6642ATT90+T 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 MAX6642ATT90+T?
For technical support, including MAX6642ATT90+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6642ATT90+T requirements.
6.How does Aetrix verify that MAX6642ATT90+T is sourced from the original manufacturer or authorized distributors?
All MAX6642ATT90+T 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 MAX6642ATT90+T meets industry standards.
7.What is the process for return or replacement of MAX6642ATT90+T?
All MAX6642ATT90+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6642ATT90+T, 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 MAX6642ATT90+T part is unused and in its original packaging.
Return procedure for MAX6642ATT90+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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