My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6653AEE+T
- Part No.:
- MAX6653AEE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Thermal Management
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX6653AEE+T.pdf
- Description:
- IC TEMP MON FAN CNTRL 16-QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,145
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6653AEE+T from Maxim Integrated is an ACPI-compliant local/remote temperature sensor and PWM fan controller IC for microprocessor-based systems. It measures 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, 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 for CPU and VRM junction monitoring.
For engineers reviewing the MAX6653AEE+T datasheet, MAX6653AEE+T pinout, MAX6653AEE+T application, or MAX6653AEE+T equivalent, key selection criteria include remote diode accuracy over +60°C–+100°C, dual shutdown outputs (SDL/SDR), SMBus timeout protection, hard-wired power-up trip set points (CRIT0/CRIT1), and compatibility with 2-wire/3-wire tachometer fans.
Technical Context
The MAX6653AEE+T integrates dual ADCs for simultaneous local die and remote diode temperature measurement, with dedicated DXP/DXN inputs biased for differential remote sensing. Its SMBus 2-wire interface supports Write Byte, Read Byte, Send Byte, and Receive Byte protocols, includes alert response address (0x19), and enforces 29–45 ms bus timeout to prevent lockup.
It implements three fan-control modes-PWM duty-cycle, RPM-select, and automatic (remote-only or remote+local)-with programmable TMIN/TRANGE thresholds, spin-up pulse, and fan-filter rate limiting (1/240 to 8/240 per cycle). Critical thermal responses are guaranteed at power-up via CRIT0/CRIT1 pin-strapped defaults, independent of SMBus communication.
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 thermal specification for remote junction (e.g., CPU diode) monitoring |
| Temp Resolution | 0.125°C (11-bit) - enables fine-grained fan speed ramping and precise thermal event detection |
| SMBus Interface | 2-wire, 10–100 kHz clock, timeout 29–45 ms - prevents system hang during bus contention or firmware failure |
| PWM Output Frequency | Programmable 11.7–93.5 Hz - matches acoustic and EMI requirements of standard 4-pin PWM fans |
| Supply Range | +3.0V to +5.5V - interoperates with 3.3V and 5V system rails without level-shifting |
| Operating Temp | -40°C to +125°C - supports industrial and server environments including VRM hotspots |
Pinout & Package
MAX6653AEE+T is housed in a 16-pin QSOP package (5.3 mm × 10.0 mm, 0.65 mm pitch), RoHS-compliant and moisture-sensitive level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWM_OUT (Pin 1) | Open-drain PWM output | Drives external MOSFET gate; requires 10 kΩ pullup; duty cycle controlled by automatic/RPM/PWM mode |
| TACH/AIN (Pin 2) | Fan tachometer input / reconfigurable analog input | Counts fan pulses (2-wire or 3-wire); full-scale count = 255; supports RPM-select mode targeting |
| CRIT0 / CRIT1 (Pins 3, 4) | Hard-wired trip set point configuration inputs | Set power-up values for THERM and shutdown limits (e.g., GND/GND = 85°C remote, 55°C local) |
| GND (Pin 5) | Ground reference | Primary return path for analog and digital circuits; must be low-impedance connection |
| VCC (Pin 6) | Power supply input | Accepts +3.0V to +5.5V; requires 0.01 µF bypass capacitor to GND |
| THERM (Pin 7) | Active-low thermal overload output / fan control input | Asserts when temp > THERM limit; pulled low externally forces full-speed fan unless masked |
| FAN_FAULT (Pin 8) | Active-low fan fault indicator | Signals stall (FFh reading) or loss-of-pulse; open-drain, requires 10 kΩ pullup |
| DXN (Pin 9) | Remote diode negative input / current sink | Biased at 0.65 V above GND; forms differential pair with DXP; max error ±1°C per 200 µV offset |
| DXP (Pin 10) | Remote diode positive input / current source | Supplies 8–12 µA bias current; must not float; 2200 pF cap to DXN recommended for noise filtering |
| SDL (Pin 11) | Active-low local shutdown output | Triggers on local die temp > LTSD limit; used to disable CPU core voltage directly |
| SDR (Pin 12) | Active-low remote shutdown output | Triggers on remote diode temp > RTSD limit; used to disable CPU I/O voltage or VRM |
| ADD (Pin 13) | SMBus address select | Sets LSBs of slave address (0x54/0x56/0x55); connect to VCC/GND/floating |
| INT (Pin 14) | Configurable interrupt output / fan control input | Reports temp/fan faults; can be pulled low to force full-speed fan (unless masked) |
| SMBDATA (Pin 15) | Open-drain SMBus data line | I²C-compatible bidirectional serial data; requires 10 kΩ pullup |
| SMBCLK (Pin 16) | SMBus clock input | Asynchronous serial clock; requires 10 kΩ pullup; supports 10–100 kHz |
Key Features
| Feature | Design Value |
|---|---|
| ACPI-compliant alarms | Four programmable thresholds (LTH/LTL/LTHER, RTH/RTL/RTHER) with INT/THERM/SDL/SDR outputs meet ACPI 2.0 thermal event signaling requirements |
| Fail-safe power-up defaults | CRIT0/CRIT1 pins define non-volatile THERM and shutdown set points - ensures thermal protection even before firmware initialization |
| Remote diode calibration | Separate Local/Remote Temperature Offset registers (0Dh/0Eh) compensate for diode ideality and series resistance errors |
| Controlled PWM edge rates | Internally limited rise/fall times reduce EMI and prevent fan coil saturation during rapid duty-cycle changes |
| Fan fault detection | Detects stall (255 RPM count), underspeed (below programmed threshold), and tachometer loss via dedicated FAN_FAULT output |
Applications
| Server CPU Thermal Management | Industrial PLC Cabinet Cooling |
|---|---|
Use Scenario: Monitoring Intel Xeon or AMD EPYC processor junction temperature and VRM hotspots in 1U/2U rack servers. IC Role / Device Role / Timing Role: Local sensor tracks MAX6653AEE+T die temp near VRM; remote channel reads CPU diode via DXP/DXN; PWM_OUT controls 4-pin PWM fan. Use Value: ±1°C remote accuracy enables precise fan speed ramping, reducing acoustic noise while maintaining <85°C CPU junction under load. | Use Scenario: Maintaining safe operating temperature in sealed industrial PLC enclosures with convection-limited airflow. IC Role / Device Role / Timing Role: MAX6653AEE+T monitors local ambient (die) and remote heatsink temperature; SDL/SDR trigger solid-state relays to cut power to motor drives if thresholds exceeded. Use Value: Hard-wired CRIT0/CRIT1 defaults ensure immediate shutdown at power-on, eliminating reliance on PLC firmware for critical safety response. |
| Telecom Base Station Fan Control | Test Equipment Thermal Protection |
Use Scenario: Regulating cooling for high-power RF amplifiers and FPGAs in outdoor 5G base station cabinets exposed to wide ambient swings. IC Role / Device Role / Timing Role: Remote diode on PA die measured via DXP/DXN; local sensor monitors MAX6653AEE+T ambient; automatic mode uses both temps to modulate fan speed. Use Value: Dual-sensor automatic mode prevents overcooling at low ambient while ensuring full-speed operation above +70°C remote, extending fan life. | Use Scenario: Protecting benchtop oscilloscopes and spectrum analyzers from internal thermal runaway during extended high-bandwidth measurements. IC Role / Device Role / Timing Role: MAX6653AEE+T monitors FPGA die (remote) and power supply section (local); THERM output throttles clock domain; SDR triggers forced shutdown if FPGA exceeds 105°C. Use Value: SMBus timeout and dedicated shutdown outputs prevent instrument damage during host PC communication failure or software crash. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar temperature monitor and PWM fan controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6654AEE+T | Same pinout, identical SMBus interface and remote diode accuracy, but lacks SDL/SDR shutdown outputs and CRIT0/CRIT1 hardware defaults | Not suitable for safety-critical shutdown paths requiring fail-safe power-up behavior | Select MAX6653AEE+T when hardware-enforced thermal shutdown (e.g., CPU rail disable) is required at boot |
| LM96163CIMTX/NOPB | 3.3V-only supply, no CRIT0/CRIT1 pins, different SMBus address scheme, and no dedicated shutdown outputs (SDL/SDR) | Requires full firmware initialization before thermal protection activates | Choose MAX6653AEE+T for systems needing guaranteed thermal response prior to OS/firmware load |
Compared with MAX6654AEE+T and LM96163CIMTX/NOPB, the MAX6653AEE+T uniquely delivers hardware-configurable shutdown outputs and power-up trip defaults - enabling robust thermal safety in unattended or firmware-restricted environments without software dependency.
Availability
MAX6653AEE+T is available at Aetrix Electronics and suitable for server thermal management, industrial PLC cabinet cooling, telecom base station fan control, and test equipment thermal protection requiring stable component supply across extended product lifecycles.
Supply support for MAX6653AEE+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) designs precision analog and mixed-signal ICs for industrial, computing, and communications applications, with expertise in thermal sensing and power management.
The MAX6653AEE+T belongs to Maxim's ACPI-compliant temperature monitor and fan controller product line, engineered specifically for reliable thermal supervision and fail-safe fan control in high-density computing and infrastructure systems.
FAQ
What is the remote temperature measurement accuracy of the MAX6653AEE+T?
The MAX6653AEE+T achieves ±1°C remote temperature measurement accuracy over the +60°C to +100°C range when measuring a remote PN junction (e.g., CPU diode). Outside this band, accuracy degrades to ±3°C (0°C to +100°C) and ±4°C (-25°C to +125°C). This specification is validated per Maxim's Electrical Characteristics table and confirmed in typical operating curves (toc03/toc04).
Does the MAX6653AEE+T support automatic fan speed control based on both local and remote temperatures?
Yes, the MAX6653AEE+T supports dual-sensor automatic fan control. When bits [7:5] of Configuration Register 00h are set to 101, the device adjusts PWM duty cycle using both local die and remote diode temperatures - selecting the higher resulting duty cycle. This mode is configured via SMBus writes to registers 24h (local TMIN/TRANGE) and 25h (remote TMIN/TRANGE).
How are the power-up temperature trip set points configured on the MAX6653AEE+T?
The MAX6653AEE+T uses CRIT0 (Pin 3) and CRIT1 (Pin 4) to set non-volatile power-up defaults for THERM and shutdown thresholds. These pins are sampled at power-on: GND/GND yields 85°C remote and 55°C local THERM limits, while VCC/VCC sets 125°C/95°C. Table 1 in the datasheet defines all eight combinations - no SMBus programming is needed for basic thermal protection.
What is the function of the SDL and SDR outputs on the MAX6653AEE+T?
SDL (Pin 11) and SDR (Pin 12) are active-low, open-drain shutdown outputs on the MAX6653AEE+T. SDL asserts when local die temperature exceeds the programmed LTSD limit; SDR asserts when remote temperature exceeds RTSD. Both are intended for direct connection to CPU power supply enable lines (e.g., VRM EN) to force immediate system shutdown, independent of software control.
Can the MAX6653AEE+T interface with 2-wire fans lacking a tachometer output?
Yes, the MAX6653AEE+T supports 2-wire fans via its TACH/AIN (Pin 2) pin, which can be reconfigured as an analog input. In this mode, the device measures fan voltage ripple amplitude instead of pulse count, enabling speed estimation for basic 2-wire fans. Configuration requires SMBus write to the appropriate mode bit in the device's configuration register.
MAX6653AEE+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:
- ±1°C(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
MAX6653AEE+T FAQ
1.How can I place an order for MAX6653AEE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6653AEE+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 MAX6653AEE+T reliable?
The price and inventory of MAX6653AEE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6653AEE+T is usually 5 days.
3.What payment methods are accepted for MAX6653AEE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6653AEE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6653AEE+T?
MAX6653AEE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6653AEE+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 MAX6653AEE+T?
For technical support, including MAX6653AEE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6653AEE+T requirements.
6.How does Aetrix verify that MAX6653AEE+T is sourced from the original manufacturer or authorized distributors?
All MAX6653AEE+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 MAX6653AEE+T meets industry standards.
7.What is the process for return or replacement of MAX6653AEE+T?
All MAX6653AEE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6653AEE+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 MAX6653AEE+T part is unused and in its original packaging.
Return procedure for MAX6653AEE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6653AEE+T Tags
-
EMC2101-ACZL-TR
Microchip Technology
-
MCP9844T-BE/MNY
Microchip Technology
-
EMC2101-R-ACZL-TR
Microchip Technology
-
MCP98244T-BE/MNY
Microchip Technology
-
TC670ECHTR
Microchip Technology
-
SE98ATP,547
NXP Semiconductors
-
AMC6821SDBQR
Texas Instruments
-
MAX6604AATA+T
Analog Devices Inc./Maxim Integrated
-
ADT7475ARQZ-REEL
onsemi
-
MAX6643LBBAEE+
Analog Devices Inc./Maxim Integrated
-
MAX6684ESA+T
Analog Devices Inc./Maxim Integrated
-
MAX6639AEE+
Analog Devices Inc./Maxim Integrated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
