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EnglishCXFA3155 contains 3 precise digital thermometers, 3/4 fan controllers, fan failure detection. The thermometers report the temperature of 2 remote sensors and 1 local sensor. The remote sensors are dio
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产品概述 返回TOP
The CXFA3155 contains 3 precise digital thermometers, 3/4 fan controllers, fan failure detection. The thermometers report the temperature of 2 remote sensors and 1 local sensor. The remote sensors are diode-connected transistors typically a low-cost, easily mounted 2N3904 NPN type or the diode built-in in CPU. Remote accuracy is ±1°C for multiple transistor manufacturer. Local accuracy is ±3°C. The CXFA3155 also support offset adjust function via SMBus to fix the error due to different CPU diode or parasitic resistors. The 2-wire serial interface accepts standard System Management Bus (SMBusTM) Write Byte, Read Byte, Send Byte, and Receive Byte commands. The SMBus address is 70h 72h for write and 7173hh for read for CXFA3155.For CXFA3155, ADD0 pin selects 3 different SMBus addresses. (see “ SMBus Digital Interface” section) CXFA3155 contains 3/4 fan controllers which perform closed-loop and open-loop control. CXFA3155 etermines the current fan speed based on the FG inputs and an externally supplied 32.768kHz clock. The driving ability is 5mA. CXFA3155 also provides ALERT for fan fail and out of control event.
产品特点 返回TOP
„ Measures Two Remote and One Local Temperatures
„ Adjustable Offset for Each Sensor via SMBus
„ Accuracy: Remote ±1°C (+20°C to +80°C) ±3°C (-10°C to +120°C) „ +4.5V to +5.5V Supply Range
„ Alert Signal for Diode Fault, Fan Fail, and Fan Out of Control
„ Supports SMBus Alert Response
„ Fan Drivers Using Linear Control Algorithm
„ Closed Loop Speed Control and programmable 8 Bits Open Loop Voltage Control for Fan
„ Wide speed control range for Fan, Accuracy within 2%, when FANx_SET_CNT > 50
„ Internal Current-limit and Over-temperature Protection for the Fan Controllers
„ Build-In Inverters for Driving Crystal
„ Optional Internal Clock Accuracy ±3% from 20°C to 80°C at 5V VCC „ 20-Pin TSSOP Package
应用范围 返回TOP
„ Projector, LCD TV, PDP TV
„ Desktop and Notebook
„ Central Office Computers
„ Telecom Equipments
„ Industrial Controls
„ LAN Servers
技术规格书（产品PDF) 返回TOP
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Sensor and Fan Controller |
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|
Part NO. |
VCC(V) min. |
VCC(V) max. |
Remote |
Local |
Fan |
Slave Address |
Accuracy (°C) |
Note |
Package |
|
4.5 |
5.5 |
2 |
1 |
3 |
111001 |
±1 |
-- |
TSSOP20 |
|
|
4.5 |
5.5 |
2 |
1 |
3 |
Selectable |
±1 |
Build-in clock |
TSSOP20 |
|
|
4.5 |
5.5 |
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