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TC655

Status: In Production

Features:

  • Temperature Proportional Fan Speed for Acoustic Control and Longer Fan Life FanSense™ Protects Against Fan FailureProvides RPM DataOver-Temperature Detection2-wire SMBus Compatible Interface3.0V to 5.5V Supply Range Fan Voltage Independent of Supply Voltage – Supports Any Fan VoltageSupports Low Cost NTC/PTC Thermistors
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Overview
Documents
Development Environment
Similar Devices
RoHS Information
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Device Overview

Summary

The TC655 is a dual PWM mode fan speed controller with FanSense™ TM technology for use with brush-less DC motors. The device allows temperature proportional speed control and therefore accomplishes lower acoustic fan noise and longer fan life. The TC655 reads the voltage provided by an external ther-mistor (or voltage output temperature sensor) and adjusts a 30% to 100% PWM duty cycle output to the fan with respect to the input temperature voltage. The PWM duty cycle can also be programmed via SMBus to allow fan speed control without the need of an external thermistor.

In normal fan operation, pulse trains are present at the SENSE pin. These pulses are used to calculate the fan RPM. The fan RPM data is used to detect a worn out, stalled, open or unconnected fan. An RPM level below the user-programmable threshold causes the TC655 to assert a logic low alert signal (FAULT). Thedefault value is 500RPM. The TC655 consumes only 0.3mA during operation and can also enter a low-power shutdown mode by setting the appropriate bit in the configuration register.

Additional Features
Temperature Proportional Fan Speed for Acoustic Control and Longer Fan Life
FanSense™ Protects Against Fan Failure
Provides RPM Data
Over-Temperature Detection
2-wire SMBus Compatible Interface
3.0V to 5.5V Supply Range
Fan Voltage Independent of Supply Voltage – Supports Any Fan Voltage
Supports Low Cost NTC/PTC Thermistors
Parametrics
Name
Value
Device Description
Programmable Dual Fan Manager
Typical Accuracy (°C)
Depends on external thermistor
SM Bus
yes
Predictive Fan Fault
yes
Max. Supply Current (µA)
320
Max. Accuracy @ 25°C (°C)
Depends on external thermistor
Fan Sense
Yes
External Temp Input
Yes
High/Low PWM Freq
Low
Temp Range (°C)
-40 to +85
Vcc Range (V)
+3.0 to +5.5

Documents

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Data Sheets

06/24/2015
571KB

Development tools data is currently unavailable.

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RoHS Information

Part Number
Device Weight (g)
Shipping Weight (grams)
Lead Count
Package Type
Package Width
Solder Composition
JEDEC Indicator
RoHS
China EFUP
TC655EUN
0.023200
0.060000
10
MSOP
3x3mm
Matte Tin
e3
TC655EUNTR
0.023200
0.200000
10
MSOP
3x3mm
Matte Tin
e3
To see a complete listing of RoHS data for this device, please Click here
Shipping Weight = Device Weight + Packing Material weight. Please contact sales office if device weight is not available.

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