Three Remote Temperature Sensors and One Fan Controllers with SMBus Serial Interface and System Reset Circuit CXFA3159 also support offset adjust function via SMBus to fix the error due to different

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The CXFA3159 contains 3 precise digital thermometers, one fan controllers, hardware and software thermal shutdown, and a system-reset circuit. The thermometers report the temperature of 3 remote sensors. 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. The CXFA3159 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 7ah for write and 7bh for read, and supports writting protection function by command 20h to prevent error behavior of μP. CXFA3159 contains one fan controllers. FAN1 controller performs closed-loop and open-loop control. CXFA3159determines the current fan speed based on the FG inputs and an externally supplied 32.768kHz clock. The driving ability of FAN1 is 500mA. CXFA3159also provide ALERT for fan fail and out of control event. The CXFA3159provides hardware and software thermal shutdown. The hardware thermal shutdown is for the sensor 3. The trigger point is set by external resistors. The trigger points of software thermal shutdown are set via SMBus. If thermal shutdown event occurs, THERM pin outputs low. The CXFA3159contains a microprocessor (μP) supervisory circuit used to monitor the power supplies in μP and digital systems. Reset threshold is set to 4.38V typical.

   产品特点 返回TOPwG2嘉泰姆

„ Measures Three Remote Temperatures wG2嘉泰姆

„ Adjustable Offset for Each Sensor via SMBus wG2嘉泰姆

„ Support Single-Core, Dual-Core and Quad-Core CPU Application wG2嘉泰姆

„ Accuracy: ±1°C (+60°C to +100°C) ±3°C (-10°C to +120°C) wG2嘉泰姆

„ +4.5V to +5.5V Supply Range wG2嘉泰姆

„ Programmable Hardware Thermal Shutdown for Sensor 3 and Programmable Software Thermal Shutdown for Sensor 1, 2. wG2嘉泰姆

„ SMBus 2-Wire Serial Interface With Writting Protection Function. wG2嘉泰姆

„ Alert Signal for Diode Fault, Fan Fail, and Fan Out of Control wG2嘉泰姆

„ Supports SMBus Alert Response wG2嘉泰姆

„ Fan Drivers Using Linear Control Algorithm with Built-in MOSFET wG2嘉泰姆

„ Closed Loop Speed Control and programmable 8 Bits Open Loop Voltage Control for Fan1 wG2嘉泰姆

„ Wide speed control range for Fan1, Accuracy within 2%, when SET_CNT1 > 50 wG2嘉泰姆

„ Internal Current- limit and Over-temperature Protection for the Fan wG2嘉泰姆

„ Reset Function Precision Monitoring of 5V Power-Supply Voltage wG2嘉泰姆

„ Measure Thermal Diode with Transistor Model wG2嘉泰姆

„ Support 45nm, 65nm and 90nm CPU thermal diode wG2嘉泰姆

„ Internal Clock 32768Hz, Accuracy ±3% from 25°C to 80°C at 5V VCC wG2嘉泰姆

„ Programmable to Use External Clock wG2嘉泰姆

„ TQFN4X4-24 PackagewG2嘉泰姆

   应用范围 返回TOPwG2嘉泰姆

„ Desktop and Notebook wG2嘉泰姆

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„ Industrial Controls wG2嘉泰姆

„ LAN ServerswG2嘉泰姆

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