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Status

Active: In Production.

Data Sheet

FULL DATA SHEET (PDF, 224kB) Download   E-Mail

Description

The MAX1669 fan controller includes a precise digital thermometer that reports the temperature of a remote sensor. The remote sensor is a diode-connected transistor-typically a low-cost, easily mounted 2N3906 PNP type-replacing conventional thermistors or thermocouples. Remote accuracy is ±3°C for transistors from multiple manufacturers, with no calibration needed. The MAX1669 has an independent fan controller with a low-current logic output requiring external power components to interface to a DC brushless fan. The fan controller has two modes of operation: a low-frequency (20Hz to 160Hz) PWM mode intended for driving the fan motor, or a high-impedance DAC output that generates a variable DC control voltage. In PWM mode, the FAN frequency can be synchronized to an external clock. Other key features include general-purpose inputs/outputs (GPIOs) for fan presence detection and a thermostat output intended as a fan override signal in case the host system loses the ability to communicate. The internal ADC has a wide input voltage range and gives overrange readings when too large an input voltage is applied. Other error-checking includes temperature out-of-range indication and diode open/short faults. The MAX1669 is available in a space-saving 16-pin QSOP package that allows it to fit adjacent to the SLOT1 connector.

An evaluation kit is available:  MAX1669EVSYS  

Key Features		Applications/Uses
Measures Remote CPU Temperature No Calibration Required 20Hz to 160Hz PWM Output for Fan PWM Frequency Sync Input (260kHz) Flexible Fan Interface: Linear or PWM SMBus 2-Wire Serial Interface Programmable Under/Overtemperature Alarms ALERT-bar Latched Interrupt Output OVERT-bar Thermostat Output Two GPIO Pins Write-Once Configuration Protection Supports SMBus Alert Response ±3°C Temperature Accuracy (-40°C to +125°C, remote) 3µA Standby Supply Current +3V to +5.5V Supply Range Small 16-Pin QSOP Package Remote diode sensor, PWM and linear fan control, dual alarms		Computers: Desktop, Workstation, Server Notebook Computers Pentium® CPU Cooling Servers Workstations

Diagram

Typical Operating Circuit

Application Notes

Application Note 694: Temperature Sensor ICs Simplify Designs - MAX1669 Application Note 809: Rev Up Your Fan Speed Control Designs - MAX1669 Application Note 896: Fan Control Advances: Consider Fan Regulation - MAX1669

Evaluation Kits

MAX1669EVSYS

Design Guides

Thermal Management (PDF)

Reliability Reports

Show FIT data for: MAX1669 Request Reliability Report for: MAX1669

Software/Models

none

Ordering Information

Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-5 of 5

MAX1669	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1669EVKIT			Active	Land Pattern: Not Available		See data sheet
MAX1669EEE			Active	QSOP;16 pin;31 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16-1*	-55°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX1669EEE-T			Active	Land Pattern: Not Available	-55°C to +125°C	See data sheet
MAX1669EEE+			Active	QSOP;16 pin;31 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16+1*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1669EEE+T			Active	QSOP;16 pin;31 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16+1*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis

More Information

New Product Press Release 1999-11-03  Temperature Family by Product Type

Related Products

MAX1619 Remote/Local Temperature Sensor with Dual Alarm Outputs and SMBus Serial Interface MAX1617A Remote/Local Temperature Sensor with SMBus Serial Interface More Like This: View Product Families for Similar Products See All Fan Controllers (19 Products)

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