Three Remote Temperature Sensors and One Fan Controllers with SMBus Serial Interface and System Reset Circuit CXFA3158 contains 3 precise digital thermometers, one fan controllers, hardware and softw

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The CXFA3158 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 CXFA3158 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. CXFA3158 contains one fan controllers. FAN1 controller performs closed-loop and open-loop control. CXFA3158determines the current fan speed based on the FG inputs and an externally supplied 32.768KHz clock. The driving ability of FAN1 is 500mA. CXFA3158also provide ALERT for fan fail and out of control event. The CXFA3158provides hardware and software thermal shutdown. The hardware thermal shutdown is for the sensor 2. 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 CXFA3158contains 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TOPT6W嘉泰姆

„ Measures Three Remote Temperatures T6W嘉泰姆

„ Adjustable Offset for Each Sensor via SMBus T6W嘉泰姆

„ Accuracy: ±1°C (+ 60°C to + 100°C) ±3°C (- 10°C to + 120°C) T6W嘉泰姆

„ +4.5V to +5.5V Supply Range T6W嘉泰姆

„ Programmable Hardware Thermal Shutdown for Sensor 2 and Programmable Software Thermal Shutdown for Sensor 1, 3. T6W嘉泰姆

„ SMBus 2-Wire Serial Interface With Writting Protection Function. T6W嘉泰姆

„ Alert Signal for Diode Fault, Fan Fail, and Fan Out of Control T6W嘉泰姆

„ Supports SMBus Alert ResponseT6W嘉泰姆

„ Fan Drivers Using Linear Control Algorithm with Built-in MOSFETT6W嘉泰姆

„ Closed Loop Speed Control and programmable 8 Bits Open Loop Voltage Control for Fan1 T6W嘉泰姆

„ Wide speed control range for Fan1, Accuracy within 2%, when SET_CNT1 > 50 T6W嘉泰姆

„ Internal Current- limit and Over-temperature Protection for the Fan T6W嘉泰姆

„ Reset Function Precision Monitoring of 5V Power-Supply Voltage T6W嘉泰姆

„ Measure Thermal Diode with Transistor Model T6W嘉泰姆

„ Support 45nm, 65nm and 90nm CPU thermal diode T6W嘉泰姆

„ 20-Pin SSOP PackageT6W嘉泰姆

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