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Analog Devices Inc./Maxim Integrated MAX6615AEE+
- Part No.:
- MAX6615AEE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Thermal Management
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX6615AEE+.pdf
- Description:
- IC TEMP MONITOR DL-CH 16-QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:753
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Product details
Overview
MAX6615AEE+ from Maxim Integrated is a dual-channel temperature monitor and fan-speed controller IC that measures internal die temperature and one external thermistor (or two external thermistors), drives two open-drain PWM outputs for fan control, monitors tachometer inputs for fan failure detection, and communicates via SMBus/I²C interface. It operates from 3.0V to 5.5V, consumes 500µA typical supply current, and supports industrial temperature range (–40°C to +125°C) - used in server thermal management subsystems to dynamically regulate cooling while minimizing acoustic noise.
For engineers reviewing the MAX6615AEE+ datasheet, MAX6615AEE+ pinout, MAX6615AEE+ application, or MAX6615AEE+ equivalent, key selection considerations include its 16-pin QSOP package, dual thermistor input capability, programmable PWM rate-of-change for silent fan transitions, fail-safe FAN_FAIL and OT outputs, and SMBus address configurability across nine options - all critical for embedded thermal control in space-constrained, high-reliability systems.
Technical Context
The MAX6615AEE+ integrates a 120ms-averaging ADC with dedicated reference voltage (1V REF output), supporting simultaneous local and remote temperature measurement with ±1°C external error (0.15V–0.71V TH_ range) and ±4°C internal die error over full operating range. Its SMBus interface implements write byte, read byte, send byte, and receive byte protocols at up to 400kHz clock frequency, with built-in timeout (29–55ms) and 9 configurable slave addresses.
It features two independent PWM generators with programmable frequency (33Hz to 35kHz), manual/automatic duty-cycle control, spin-up enforcement (2s full-on), and rate-of-change limiting to suppress audible fan speed transients. Fan failure detection uses tachometer pulse counting against programmable limits, triggering FAN_FAIL assertion only after two consecutive failed measurements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0V to 5.5V - compatible with standard 3.3V and 5V system rails without level-shifting. |
| Operating Current | 500µA typical - enables low-power thermal monitoring in always-on subsystems. |
| Temperature Resolution | 0.125°C - supports fine-grained thermal response in precision cooling applications. |
| External Temp Error | ±1°C (0.15V–0.71V TH_ range) - ensures accurate thermistor-based ambient/sink sensing. |
| PWM Frequency Range | 33Hz to 35kHz - selectable for MOSFET gate drive (low-freq) or PWM-to-DC conversion (high-freq). |
| SMBus Clock Max | 400kHz - matches standard fast-mode I²C timing for high-throughput register access. |
| Conversion Time | 250ms per full dual-channel cycle - balances noise rejection and update latency for thermal loop stability. |
Pinout & Package
MAX6615AEE+ is housed in a 16-pin QSOP (Quad Small Outline Package) with 0.15mm lead pitch and exposed pad for thermal dissipation - footprint-compatible with industry-standard 16-pin thermal sensor controllers and suitable for reflow assembly.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | PWM1 | Open-drain fan driver output - supports pullup to 12V regardless of VCC; drives n-MOSFET gate or fan PWM input directly. |
| 2 | TACH1 | Fan tachometer input - accepts logic-level pulses up to 12V; enables RPM monitoring and failure detection. |
| 3 | ADD0 | SMBus address LSB - sets device address with ADD1; allows up to nine devices on same bus. |
| 4 | ADD1 | SMBus address MSB - used with ADD0 for nine unique slave addresses (0x18–0x1E, 0x48–0x4E). |
| 5,10 | GND | Ground reference - must be connected together; serves as return path for REF, TH1, TH2, and digital logic. |
| 6 | TH1 | External thermistor input 1 - connects series thermistor/REXT network to REF; enables remote temperature sensing. |
| 7 | REF | 1V reference output - high-impedance during idle; powers thermistor divider network during measurement. |
| 8 | TH2 | External thermistor input 2 - identical function to TH1; supports dual remote sensing or local+remote configuration. |
| 9 | FAN_FAIL | Open-drain fan failure indicator - asserts low on dual tachometer failures; pullup to 5.5V supported. |
| 11 | OT | Overtemperature output - active-low, open-drain; triggers system shutdown or clock throttling when thresholds exceeded. |
| 12 | VCC | Power supply input - 3.0V–5.5V operation; requires 0.1µF bypass capacitor to GND for noise immunity. |
| 13 | SDA | SMBus data I/O - bidirectional, open-drain; pullup to 5.5V allowed; high-impedance when VCC = 0V. |
| 14 | SCL | SMBus clock input - open-drain; pullup to 5.5V allowed; synchronizes register reads/writes. |
| 15 | TACH2 | Second fan tachometer input - identical to TACH1; enables dual-fan health monitoring. |
| 16 | PWM2 | Second open-drain fan driver - independent of PWM1; supports redundant or multi-zone cooling control. |
Key Features
| Feature | Design Value |
|---|---|
| Dual thermistor inputs (TH1/TH2) | Enables simultaneous monitoring of two remote locations (e.g., CPU heatsink + power supply) without external ADCs. |
| Controlled PWM rate-of-change | Prevents abrupt fan speed shifts - eliminates audible "whine" during thermal transients in quiet environments. |
| Fail-safe FAN_FAIL and OT outputs | Provides hardware-level fault signaling independent of firmware - critical for safety-critical thermal shutdown paths. |
| Programmable SMBus addresses (9 options) | Eliminates bus conflicts in multi-sensor systems (e.g., 4U server with 8+ thermal zones). |
| 250ms dual-channel conversion time | Optimizes thermal loop responsiveness while maintaining >60dB noise rejection via 120ms ADC integration. |
| Spin-up enforcement (2s full-on) | Guarantees reliable fan startup from stall condition - avoids undetected fan lockup in cold-start scenarios. |
Applications
| Server Rack Thermal Management | High-Density Power Supply Monitoring |
|---|---|
Use Scenario: Real-time thermal regulation across multiple CPUs, GPUs, and VRMs in 1U/2U rack servers. IC Role / Device Role / Timing Role: Dual-channel temperature monitor and PWM fan controller - acquires local die and heatsink temperatures, computes fan speed targets, and drives PWM outputs with hysteresis and rate limiting. Use Value: Reduces acoustic noise by 8–12dB(A) during low-load operation while preventing thermal throttling under burst workloads via 0.125°C resolution and 250ms update rate. |
Use Scenario: Overtemperature protection and cooling control in telecom-grade AC/DC and DC/DC power modules. IC Role / Device Role / Timing Role: Remote temperature sensor and fail-safe controller - measures transformer/inductor and MOSFET junction temperatures, asserts OT for immediate shutdown if >110°C, and modulates fan speed to maintain <85°C hotspot. Use Value: Extends power module lifetime by 35% (per Arrhenius model) through precise thermal derating and eliminates field failures from undetected fan stall via dual tachometer validation. |
| Network Switch Chassis Cooling | Workstation GPU Thermal Control |
Use Scenario: Distributed thermal management across line cards, fabric modules, and management controllers in modular L2/L3 switches. IC Role / Device Role / Timing Role: SMBus-addressable thermal node - provides localized temperature telemetry and fan control per slot, coordinated via centralized BMC. Use Value: Enables hot-swappable module thermal autonomy - each MAX6615AEE+ independently regulates its fan pair without BMC polling overhead, reducing system bus traffic by 40%. |
Use Scenario: Adaptive cooling for high-TDP discrete GPUs in professional workstations under variable rendering loads. IC Role / Device Role / Timing Role: Dual-input thermal supervisor - monitors GPU die (via internal sensor) and VRM MOSFETs (via TH1 thermistor), driving two PWM fans with independent start temps and max duty cycles. Use Value: Maintains GPU junction <83°C during 100% load while keeping acoustic output <28dB(A) at idle - achieved via programmable fan-start temp (45°C) and 5°C hysteresis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel temperature monitoring and fan control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM96163CIMT/NOPB | 3.3V-only supply (no 5V support); single PWM output; no GPIOs; ±2°C remote error (vs. ±1°C). | Lacks dual PWM and tach monitoring - requires external circuitry for second fan control and failure detection. | Select when cost sensitivity outweighs dual-fan capability and 5V compatibility is unnecessary. |
| ADM1032ARMZ-REEL | Single remote channel only; no TH2 input; 12-bit resolution (0.25°C) vs. 0.125°C; SMBus timeout not specified. | Cannot monitor two remote points simultaneously - unsuitable for multi-zone chassis designs requiring independent sensor pairs. | Choose only for legacy designs where single-point thermal feedback suffices and board space is extremely constrained. |
Compared with LM96163CIMT/NOPB and ADM1032ARMZ-REEL, the MAX6615AEE+ delivers superior thermal fidelity (0.125°C resolution, ±1°C error), native dual-fan support with integrated tach validation, and flexible 3.0–5.5V operation - making it the optimal choice for new server, networking, and workstation platforms demanding robust, scalable thermal management.
Availability
MAX6615AEE+ is available at Aetrix Electronics and suitable for server thermal management, high-density power supply monitoring, and network switch chassis cooling requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for MAX6615AEE+ 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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, computing, and communications markets.
The MAX6615AEE+ belongs to Maxim's precision thermal monitoring product line, designed specifically for intelligent fan control in high-reliability computing infrastructure where acoustic performance, fault resilience, and SMBus scalability are mandatory.
FAQ
What is the maximum allowable voltage on the PWM1 and PWM2 pins of the MAX6615AEE+?
The MAX6615AEE+ PWM1 and PWM2 pins are open-drain outputs rated for pullup voltages up to 12V, independent of the VCC supply voltage. This allows direct interfacing with higher-voltage fan supplies (e.g., 12V DC fans) without external level-shifting components. The absolute maximum rating for these pins is +13.5V, but sustained operation above 12V is not recommended per the datasheet's design guidance. Always use an appropriate current-limiting pullup resistor sized for the target fan voltage and MAX6615AEE+ sink capability (6mA min at 0.4V VOL).
Does the MAX6615AEE+ support both local (die) and remote (thermistor) temperature sensing simultaneously?
Yes, the MAX6615AEE+ supports simultaneous local and remote temperature sensing: its internal die sensor is always active, and TH1 can be configured to read an external thermistor. While TH2 is physically present, the MAX6615AEE+ variant (16-pin) does not enable dual-remote mode - it uses TH2 exclusively for the second remote channel or as an alternative local sensor input depending on configuration bit D2 in register 02h. Full dual-remote capability (TH1 + TH2) is reserved for the MAX6616AEG (24-pin) variant.
How does the MAX6615AEE+ detect and respond to fan failure?
The MAX6615AEE+ detects fan failure by monitoring tachometer pulses on TACH1 and TACH2 inputs. If the measured pulse count falls below a programmable threshold over two consecutive conversions, the device asserts the open-drain FAN_FAIL output low. Concurrently, it drives the corresponding PWM output at 100% duty cycle for ~2 seconds to attempt fan restart before final assertion. The FAN_FAIL signal remains active until cleared via SMBus register read or mask disable - providing deterministic hardware-level fault signaling for system-level watchdog or shutdown logic.
What SMBus addresses are available for the MAX6615AEE+ and how are they selected?
The MAX6615AEE+ supports nine unique SMBus slave addresses: 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x48, and 0x4E. These are selected by hardwiring ADD0 (pin 3) and ADD1 (pin 4) to GND or VCC - with three states per pin (GND, VCC, or floating), yielding nine combinations. The address is latched internally after power-on reset and rechecked periodically to support dynamic reconfiguration. This enables up to nine MAX6615AEE+ devices on a single SMBus without address collision.
Can the MAX6615AEE+ operate with a 5.0V supply, and what is its typical supply current at that voltage?
Yes, the MAX6615AEE+ operates across 3.0V to 5.5V, fully supporting 5.0V nominal supply. At VCC = 5.0V and TA = +25°C, its typical operating supply current is 500µA - consistent across the entire voltage range per the Electrical Characteristics table. Standby current drops to 10µA when the interface is inactive and ADC is idle, enabling ultra-low-power thermal supervision during system sleep states.
MAX6615AEE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Fan Control, Temp Monitor
- Sensor Type:
- Internal and External
- Sensing Temperature:
- -40°C ~ 125°C
- Accuracy:
- ±4°C(Max)
- Topology:
- ADC, PWM Generator, Tach Counter
- Output Type:
- 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
MAX6615AEE+ FAQ
1.How can I place an order for MAX6615AEE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6615AEE+ 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 MAX6615AEE+ reliable?
The price and inventory of MAX6615AEE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6615AEE+ is usually 5 days.
3.What payment methods are accepted for MAX6615AEE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6615AEE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6615AEE+?
MAX6615AEE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6615AEE+ 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 MAX6615AEE+?
For technical support, including MAX6615AEE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6615AEE+ requirements.
6.How does Aetrix verify that MAX6615AEE+ is sourced from the original manufacturer or authorized distributors?
All MAX6615AEE+ 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 MAX6615AEE+ meets industry standards.
7.What is the process for return or replacement of MAX6615AEE+?
All MAX6615AEE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6615AEE+, 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 MAX6615AEE+ part is unused and in its original packaging.
Return procedure for MAX6615AEE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6615AEE+ Tags
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EMC2101-ACZL-TR
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