CXFA3155测量两个远程和一个本地温度通过SMBus为每个传感器调整偏移使用线性控制算法的风扇驱动器风扇的闭环速度控制和可编程8位开环电压控制3/4风扇控制器风扇故障检测

CXFA3155含3个精确的数字温度计、3/4风扇控制器、风扇故障检测。温度计报告2个远程传感器和1个本地传感器的温度。远程传感器是二极管连接晶体管，通常是一种低成本、易于安装的2N3904 NPN型或二极管内置CPU。多晶体管制造商的遥控精度为±1°C。本地精度为±3°C。CXFA3155还支持通过SMBus进行偏移调整功能，以修复由于CPU二极管或寄生电阻不同而产生的误差。2线串行接口接受标准系统管理总线（SMBusTM）的写入字节、读取字节、发送字节和接收字节命令。对于CXFA3155，SMBus地址为70h 72h用于写入，7173hh用于读取。对于CXFA3155，ADD0 pin选择3个不同的SMBus地址。（请参阅“SMBus数字接口”一节）CXFA3155包含3/4风扇控制器，用于执行闭环和开环控制。CXFA3155根据FG输入和外部提供的32.768kHz时钟确定当前风扇转速。驾驶能力为5毫安。CXFA3155还提供风扇故障和失控事件警报。
测量两个远程和一个本地温度
通过SMBus为每个传感器调整偏移
“精度：远程±1°C（+20°C至+80°C）±3°C（-10°C至+120°C）；+4.5V至+5.5V电源范围
·二极管故障、风扇故障和风扇失控的警报信号
支持SMBus警报响应
使用线性控制算法的风扇驱动器
·风扇的闭环速度控制和可编程8位开环电压控制
·风扇调速范围宽，当风扇设定值>50时，精度在2%以内
风扇控制器的内部电流限制和超温保护
·内置变频器，用于驱动晶体
“可选内部时钟精度±3%，从20°C到80°C，5V VCC”，20针TSSOP封装

目录

1.产品概述       2.产品特点     

3.应用范围       4.技术规格书下载（PDF文档）

5.产品封装       6.电路原理图  

7.相关产品

   产品概述 返回TOP

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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

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„ 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

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„ 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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产品封装图 返回TOP

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电路原理图 返回TOP

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Sensor   and Fan Controller
Part NO.	VCC(V) min.	VCC(V) max.	Remote	Local	Fan	Slave  Address	Accuracy (°C)	Note	Package
CXFA3154	4.5	5.5	2	1	3	111001	±1	--	TSSOP20
CXFA3155	4.5	5.5	2	1	3	Selectable	±1	Build-in clock	TSSOP20
CXFA3156	4.5	5.5	2	1	4	111001	±1	Build-in clock	TSSOP20
CXFA3157	4.5	5.5	2	1	4	111001	±1	--	TSSOP20
CXFA3158	4.5	5.5	3	--	1	111101	±1	Support transitor  mode	SSOP20
CXFA3159	4.5	5.5	3	--	1	--	±1	--	TQFN4X4-24
CXFA3160	4.5	5.5	3	--	1	111101	±1	PWM fan controller  Hardware Sets SHDN	SSOP16 TQFN4X4-24
Fan Controller & Driver
Part NO.	VCC(V) min.	VCC (V) max.	IOUT (A)	Crystal (kHz)	Interface	Speed Control	FOUT	Note	Package
CXFA3161	4.5	5.5	0.8	NA	SMBus	PWM	PWM Pulse	FG,SCP	SOP-8
CXFA3162	3	5.5	0.5	32.768	SMBus	Linear/   PWM	DAC PWM	FG,X2,ALERT#,CLK( 1% ),ADD0  for address selectable,Open &Close loop control,SCP	MSOP10
CXFA3163/4	3	5.5	0.5	NA	SMBus	Linear/ PWM	DAC PWM	FG,X2,ALERT#,CLK,ADD0 for  address selectable,Open &Close loop control,SCP	SOP8/MSOP8/MSOP10
CXFA3165/6	3	5.5	0.5	32.768	SMBus	Linear/ PWM	DAC PWM	FG,X2,ALERT#,CLK( 3% ),ADD0  for address selectable,Open &Close loop control,SCP	SOP8/MSOP8/MSOP10
Fan Driver
Part NO.	VCC(V) min.	VCC (V) max.	IOUT (A)	Enable active	Control Interface	Control Method	VOUT	Note	Package
CXFA3167 /8	3	5.5	0.5	High	VSET	Linear	1.6XVSET	EN,OCP,OTP,G993 with SS	SOP-8
CXFA3169 /70	3	5.5	0.5	--	VSET	Linear	1.6X VSET	FON#,OCP,OTP,G995 with SS	SOP-8
CXFA3171	10	20	0.5	High	VSET	Linear	4X VSET	EN,OCP,OTP	SOP-8 SOP-8(FD)
CXFA3172	8	15	0.5	High	VSET	Linear	4X VSET	EN,OCP,OTP	SOP8 SOP8(FD)
CXFA3173	4.5	5.5	0.5	High	VSET	Linear	1.6X VSET	EN,OCP,OTP,VSET built-in SS	SOP8/TDFN3X3-8