CXFA3157 contains 3/4 controllers. FAN controller performs closed-loop and open-loop control. CXFA3157determines the current fan speed based on the FG inputs and an externally supplied 32.768kHz clock

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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 72h for write and 73h for read. CXFA3157 contains 3/4 controllers. FAN controller performs closed-loop and open-loop control. CXFA3157determines the current fan speed based on the FG inputs and an externally supplied 32.768kHz clock. The driving ability is 5mA. CXFA3157also provides ALERT for fan fail and out of control event.The CXFA3157contains 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 CXFA3157also support offset adjust function via SMBus to fix the error due to different CPU diode or parasitic resistors.

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„ Measures Two Remote and One Local Temperatures usU嘉泰姆

 „ Adjustable Offset for Each Sensor via SMBus usU嘉泰姆

„ Accuracy: Remote ±1°C (+20°C to +80°C) ±3°C (-10°C to +120°C) usU嘉泰姆

„ +4.5V to +5.5V Supply Range usU嘉泰姆

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

„ Supports SMBus Alert Response usU嘉泰姆

„ Fan Drivers Using Linear Control Algorithm usU嘉泰姆

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

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

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

„ Build-In Inverters for Driving Crystal usU嘉泰姆

„ 20-Pin TSSOP PackageusU嘉泰姆

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