产品概述 返回TOPZIf嘉泰姆

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TOPZIf嘉泰姆

„ Measures Two Remote and One Local Temperatures ZIf嘉泰姆

 „ Adjustable Offset for Each Sensor via SMBus ZIf嘉泰姆

„ Accuracy: Remote ±1°C (+20°C to +80°C) ±3°C (-10°C to +120°C) „ +4.5V to +5.5V Supply Range ZIf嘉泰姆

„ Alert Signal for Diode Fault, Fan Fail, and Fan Out of Control ZIf嘉泰姆

„ Supports SMBus Alert Response ZIf嘉泰姆

„ Fan Drivers Using Linear Control Algorithm ZIf嘉泰姆

„ Closed Loop Speed Control and programmable 8 Bits Open Loop Voltage Control for Fan ZIf嘉泰姆

„ Wide speed control range for Fan, Accuracy within 2%, when FANx_SET_CNT > 50 ZIf嘉泰姆

„ Internal Current-limit and Over-temperature Protection for the Fan Controllers ZIf嘉泰姆

„ Build-In Inverters for Driving Crystal ZIf嘉泰姆

„ Optional Internal Clock Accuracy ±3% from 20°C to 80°C at 5V VCC „ 20-Pin TSSOP PackageZIf嘉泰姆

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