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Analog Devices Inc./Maxim Integrated MAX6663AEE+T
- Part No.:
- MAX6663AEE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Thermal Management
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX6663AEE+T.pdf
- Description:
- IC TEMP MON FAN CNTRL 16-QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,905
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Product details
Overview
MAX6663AEE+T from Maxim Integrated is an ACPI-compliant local/remote temperature sensor and PWM fan controller IC. It measures its own die temperature (±2°C accuracy, -40°C to +125°C) and remote-PN junction temperature (±1°C from +60°C to +100°C), provides 0.125°C resolution for both channels, and drives a DC cooling fan via open-drain PWM_OUT with programmable frequency (11.7–93.5 Hz). It is used in server thermal management systems to dynamically throttle fan speed based on CPU and chipset junction temperatures.
For engineers reviewing the MAX6663AEE+T datasheet, MAX6663AEE+T pinout, MAX6663AEE+T application, or MAX6663AEE+T equivalent, this page delivers verified technical context, SMBus interface timing constraints, remote diode biasing requirements (DXP/DXN), THERM/INT interrupt behavior, and validated alternative options for thermal monitoring and fan control in x86-based computing platforms.
Technical Context
The MAX6663AEE+T implements dual-channel delta-sigma ADCs for simultaneous local die and remote PN-junction temperature measurement, with internal 254–286 kHz clock generation and SMBus 2-wire interface compliance (10–100 kHz clock, 29–45 ms timeout). Its fan-control logic supports three modes: automatic (remote- or dual-temperature-driven), RPM-select (tachometer-targeted), and fixed-duty-cycle PWM - all with programmable spin-up duration and fan-filter rate limiting (1/240 to 8/240 duty-step per cycle).
It features hard-wired CRIT0/CRIT1 inputs that set power-up default thresholds for THERM and INT outputs, ensuring fail-safe thermal response even during SMBus lockup. The device uses DXP as current source and DXN as current sink/negative A/D input for remote diode sensing, with 8–12 µA sourcing current and 0.7 V DXN source voltage - requiring 2200 pF capacitor between DXP/DXN for EMI filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Local Temp Accuracy | ±2°C over -40°C to +100°C - ensures reliable die-temperature monitoring for CPU thermal throttling decisions |
| Remote Temp Accuracy | ±1°C from +60°C to +100°C - meets ACPI critical temperature alarm requirements for remote diodes in CPUs/GPUs |
| Temp Resolution | 0.125°C for both local and remote - enables fine-grained fan-speed ramping without audible step artifacts |
| SMBus Interface | I²C-compatible 2-wire bus with 10–100 kHz clock and 29–45 ms timeout - prevents bus lockup in multi-device systems |
| PWM Output Frequency | Programmable 11.7–93.5 Hz (8 settings) - matches mechanical resonance profiles of common 4-pin PWM fans |
| Supply Voltage Range | +3.0V to +5.5V - supports direct connection to 3.3V or 5V system rails without LDO |
| Operating Temp Range | -40°C to +125°C - qualified for industrial and server motherboard environments near VRMs and CPUs |
Pinout & Package
MAX6663AEE+T is housed in a 16-pin QSOP package (5.3 mm × 10.2 mm, 0.65 mm pitch), RoHS-compliant and moisture-sensitive level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWM_OUT (Pin 1) | Open-drain PWM output | Drives external N-channel MOSFET gate; requires 10 kΩ pullup to VCC; duty cycle controlled by register 22h bits [3:0] or automatic algorithm |
| TACH/AIN (Pin 2) | Digital tachometer input / analog fan speed sense | Counts fan pulses (2-wire or 3-wire); full-scale count = 255; accuracy ±6% - used for RPM feedback in closed-loop control |
| GND (Pin 5) | Power ground reference | Primary return path for internal ADC, SMBus I/O, and PWM driver; must be low-impedance connection to system ground plane |
| VCC (Pin 6) | Positive supply input | Accepts +3.0V to +5.5V; bypass with 0.01 µF ceramic capacitor directly to GND to suppress switching noise |
| THERM (Pin 7) | Active-low thermal alert output / fan override input | Asserts when local or remote temp exceeds RTHER/LTHER; pulled low externally to force full-speed fan - status bit cleared only by reading status register 2 |
| FAN_FAULT (Pin 8) | Active-low fan fault indicator | Asserts when tachometer reads 0xFF (255) - indicates stalled fan; requires 10 kΩ pullup; no auto-clear; must be read to reset |
| DXN (Pin 9) | Remote diode negative input / current sink | Biased internally at 0.65 V above GND; sinks 8–12 µA; forms differential pair with DXP; must not float |
| DXP (Pin 10) | Remote diode positive input / current source | Sources 8–12 µA into remote diode anode; connects to cathode of CPU/GPU thermal diode; must not float - tie to DXN if unused |
| ADD (Pin 13) | SMBus address select | Sets LSBs of 7-bit slave address (0x54, 0x56, or 0x55) - connect to VCC, GND, or leave floating per Table 2 |
| INT (Pin 14) | Configurable interrupt output / fan override input | Asserts on temp/fan faults; can be pulled low to force full-speed fan unless masked in config register 00h bit 1 |
| SMBDATA (Pin 15) | Open-drain SMBus data line | Bi-directional serial data; requires 10 kΩ pullup; supports Write Byte, Read Byte, Send Byte, Receive Byte protocols |
| SMBCLK (Pin 16) | SMBus clock input | Accepts 10–100 kHz clock; synchronous edge-triggered; no pullup required |
Key Features
| Feature | Design Value |
|---|---|
| ACPI-compliant temperature alarms | Four independent trip points (LTH/LTL, RTH/RTL) plus THERM/INT thresholds - fully programmable via SMBus to meet OS-directed thermal policy |
| Remote diode sensing with noise immunity | DXP/DXN architecture with 2200 pF capacitor support - rejects >20 mVpp common-mode and differential noise up to 10 MHz |
| Fail-safe power-up defaults | CRIT0/CRIT1 pins set hardware-defined THERM and INT thresholds at boot - ensures thermal protection before firmware initialization |
| Programmable fan dynamics | Spin-up time (0–128 ms), fan-filter step size (0.416–3.333% per cycle), and PWM rise/fall time control - eliminates audible whine and mechanical stress |
| Robust SMBus interface | Timeout detection, alert response address (0x19), and multimaster arbitration support - maintains bus integrity in dense server backplanes |
Applications
| Server CPU Thermal Monitoring | Workstation GPU Junction Sensing |
|---|---|
Use Scenario: Real-time monitoring of Intel Xeon or AMD EPYC processor die temperature and remote thermal diode on memory controller hub. IC Role / Device Role / Timing Role: Local sensor measures MAX6663AEE+T die temp; remote channel reads CPU's on-die diode via DXP/DXN; THERM asserts at 95°C to trigger clock throttling. Use Value: Enables precise, low-latency thermal response without host CPU intervention - reduces risk of thermal shutdown during sustained compute loads. |
Use Scenario: Measuring junction temperature of NVIDIA A-series or AMD Radeon Pro GPUs in high-end CAD workstations. IC Role / Device Role / Timing Role: Remote diode channel tracks GPU die temp; local channel monitors ambient near VRM; INT signals when either exceeds user-defined thresholds. Use Value: Provides independent thermal supervision layer that operates even if GPU firmware fails - improves system reliability under overclocking conditions. |
| Telecom Baseband Unit Cooling | Industrial PLC Cabinet Fan Control |
Use Scenario: Regulating forced-air cooling for LTE/5G baseband processing cards operating in sealed outdoor enclosures. IC Role / Device Role / Timing Role: MAX6663AEE+T controls 4-wire PWM fans via PWM_OUT; TACH/AIN verifies RPM; FAN_FAULT detects airflow loss due to dust clogging. Use Value: Maintains stable junction temperatures (<85°C) across -40°C to +70°C ambient - extends FPGA and RFIC lifetime in unventilated deployments. |
Use Scenario: Managing cooling for DIN-rail mounted PLCs in factory automation cabinets with variable ambient (0–60°C) and high EMI. IC Role / Device Role / Timing Role: Uses DXP/DXN to monitor heatsink temp near power modules; SMBus reports data to PLC controller; THERM triggers emergency shutdown at 105°C. Use Value: Eliminates need for external thermistors and analog signal conditioning - reduces BOM cost and PCB area while improving noise immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar temperature monitoring and PWM fan control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6653AEE+T | Includes SDR/SDL shutdown outputs; identical pinout and SMBus register map; same temp accuracy and PWM specs | Required where hardware-level CPU power disable (via SDL/SDR) is mandated for safety-critical thermal events | Select MAX6653AEE+T only if dual independent shutdown outputs are needed - otherwise MAX6663AEE+T reduces pin count and simplifies layout |
| LM96163CIMTX/NOPB | TI part with ±1.5°C remote accuracy (0°C–100°C), 12-bit resolution, and integrated fan tachometer comparator; different SMBus address and register layout | Used in legacy Dell/HP servers; lacks CRIT0/CRIT1 hardware defaults; requires full firmware initialization for thermal protection | Choose LM96163CIMTX/NOPB only for drop-in replacement in existing designs using TI thermal managers - not recommended for new ACPI 5.0+ implementations |
Compared with MAX6653AEE+T, the MAX6663AEE+T omits SDR/SDL outputs to reduce cost and complexity while retaining identical temperature sensing, PWM control, and fail-safe CRIT pin functionality; versus LM96163CIMTX/NOPB, it offers superior remote accuracy, hardware-set defaults, and tighter SMBus timing compliance for robust multi-master operation.
Availability
MAX6663AEE+T is available at Aetrix Electronics and suitable for server thermal management, telecom baseband cooling, and industrial PLC cabinet fan control requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6663AEE+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
Maxim Integrated (now part of Analog Devices) is a U.S.-based semiconductor company specializing in precision analog, mixed-signal, and power management ICs for computing, industrial, and communications infrastructure.
The MAX6653/MAX6663/MAX6664 product line was designed specifically for ACPI-compliant thermal monitoring and intelligent fan control in x86-based servers, workstations, and networking equipment - emphasizing hardware-fail-safe operation and SMBus interoperability.
FAQ
What is the remote temperature measurement accuracy of the MAX6663AEE+T, and over what range is it specified?
The MAX6663AEE+T achieves ±1°C remote temperature measurement accuracy from +60°C to +100°C when measuring a properly biased remote PN junction (e.g., CPU thermal diode). Outside this range, accuracy degrades to ±3°C (0°C to +100°C) and ±4°C (-25°C to +125°C), as confirmed in the Electrical Characteristics table. This specification is critical for meeting ACPI thermal event thresholds in server BIOS implementations.
Does the MAX6663AEE+T support both 2-wire and 3-wire fans, and how is tachometer input configured?
Yes, the MAX6663AEE+T supports both 2-wire and 3-wire fans via the TACH/AIN pin (Pin 2). In standard mode, it functions as a digital tachometer input counting fan pulses; when reprogrammed as an analog input, it measures voltage from a 2-wire fan's speed signal. Full-scale tachometer count is 255, with ±6% accuracy, and fan fault is signaled when the register reads 0xFF (255).
How does the MAX6663AEE+T handle SMBus communication failures, and what fail-safe mechanisms are built in?
The MAX6663AEE+T incorporates an SMBus timeout (29–45 ms) to prevent bus lockup, and uses CRIT0/CRIT1 pins to set hardware-defined power-up values for THERM and INT trip points - ensuring thermal protection remains active even if the SMBus is nonfunctional or firmware fails to initialize. These defaults are decoded per Table 1 and do not require software configuration.
Can the MAX6663AEE+T drive a fan directly, or does it require an external transistor?
The MAX6663AEE+T cannot drive a fan directly. Its PWM_OUT (Pin 1) is an open-drain digital output rated for ≤50 mA sink current and requires an external pullup resistor (typically 10 kΩ to VCC) and an N-channel MOSFET or bipolar transistor to switch the fan's power rail. This architecture isolates the IC from fan motor noise and enables compatibility with 12V, 5V, or 3.3V fan supplies.
What is the function of the DXP and DXN pins on the MAX6663AEE+T, and what external components are required?
DXP (Pin 10) sources 8–12 µA current into the anode of a remote thermal diode; DXN (Pin 9) sinks matching current from the cathode and is biased at 0.65 V above GND. A 2200 pF capacitor must be placed between DXP and DXN for EMI filtering; values up to 3300 pF are acceptable, but higher capacitance introduces measurement error due to current-source slew limitations.
MAX6663AEE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Fan Control, Temp Monitor
- Sensor Type:
- Internal and External
- Sensing Temperature:
- -40°C ~ 125°C, External Sensor
- Accuracy:
- ±2°C Local(Max), ±3°C Remote(Max)
- Topology:
- ADC, Multiplexer, Register Bank, Tachometer
- Output Type:
- I2C/SMBus
- Output Alarm:
- Yes
- Output Fan:
- Yes
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
MAX6663AEE+T FAQ
1.How can I place an order for MAX6663AEE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6663AEE+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 MAX6663AEE+T reliable?
The price and inventory of MAX6663AEE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6663AEE+T is usually 5 days.
3.What payment methods are accepted for MAX6663AEE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6663AEE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6663AEE+T?
MAX6663AEE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6663AEE+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 MAX6663AEE+T?
For technical support, including MAX6663AEE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6663AEE+T requirements.
6.How does Aetrix verify that MAX6663AEE+T is sourced from the original manufacturer or authorized distributors?
All MAX6663AEE+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 MAX6663AEE+T meets industry standards.
7.What is the process for return or replacement of MAX6663AEE+T?
All MAX6663AEE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6663AEE+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 MAX6663AEE+T part is unused and in its original packaging.
Return procedure for MAX6663AEE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6663AEE+T Tags
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EMC2101-ACZL-TR
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