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MAX1669
Fan Controller and Remote Temperature Sensor with SMBus Serial Interface
Industry First - Temperature Sensor with PWM and Linear Fan Control
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Status
Active: In Production.
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.
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Data Sheet
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An evaluation kit is available: MAX1669EVSYS
Key Features
- 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
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Applications/Uses
- Computers: Desktop, Workstation, Server
- Notebook Computers
- Pentium® CPU Cooling
- Servers
- Workstations
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Key Specifications:
| Fan Controllers |
| Part Number |
Sensor Type |
Fan Cntrl. |
Interface |
Accuracy
(±°C) |
Temp. Thresh.
(°C) |
Temp. Resolution
(bits) |
| MAX1669 |
Remote |
PWM |
2-Wire/I2C/SMBus |
3 |
Programmable |
8 |
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See All Fan Controllers (19)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
 Typical Operating Circuit
Application Notes
Product Guides
Reliability Reports
Software/Models
Ordering Information
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Part Number
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Free
Sample |
Buy |
Status
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| MAX1669EEE
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Active |
QSOP;16 pin;30.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16-1*
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-55°C to +125°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1669EEE+
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Active |
QSOP;16 pin;30.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16+1*
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-55°C to +125°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1669EEE+T
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Active |
QSOP;16 pin;30.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16+1*
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-55°C to +125°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1669EEE-T
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Active |
QSOP;16 pin
Land Pattern: Not Available
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-55°C to +125°C
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See data sheet
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| MAX1669EVKIT
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Active |
KIT;
Land Pattern: Not Available
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See data sheet
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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; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product 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.
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Similar Products by Function
| MAX1617A |
Remote/Local Temperature Sensor with SMBus Serial Interface |
| MAX1619 |
Remote/Local Temperature Sensor with Dual Alarm Outputs and SMBus Serial Interface |
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Similar Products by Application
Evaluation Kits
Products with Similar Part Numbers
More Information
Didn't Find What You Need?
Information Index
Document Ref.: 19-1574
Rev 0;
2000-01-01
This page last modified: 2007-06-05
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