MAXIM MAX6641 User Manual

________________________________
概述
MAX6641
是温度传感器和风扇控制器能够准确地测
量自身管芯的温度以及远端PN结的温度该器件使用
线串行接口以数字形式报告温度值远端PN结通常 是
CPU、FPGA或ASIC
上共集极
pnp
晶体管的发射结
该2线串行接口接受标准的系统管理总线
(SMBus)
TM
写字
节、读字节、发送字节与接收字节指令,来读取温度数 据并编程告警阈值温度数据控制
PWM
输出信号,来 调节冷却风扇的速度于是当系统运行温度较低时,可 以将噪声减到最小但当功耗增大时可以提供最大的 冷却能力该器件还具有超温度告警输出用来产生中 断减速信号或关断信号
MAX6641
工作在
3.0V至5.5V
电源电压范围内消耗电源电流的典型值为
500mA
MAX6641
提供细小的10引脚
µMAX
®
封装工作在汽车
级温度范围内
(-40°C至+125°C)
________________________________
应用
台式电脑
笔记本电脑
工作站
服务器
网络设备
工业应用
________________________________
特性
细小的
3mm x 3mm µMAX
封装
热二极管输入
本地温度传感器
漏极开路
PWM
输出用来驱动风扇
可编程的风扇控制特性
自动的风扇启转确保风扇可靠启动
±1°C
远端温度精度
(+60°C至+145°C)
受控的变化速率使风扇速度调节
不引人注意
上电后立即开始温度监视实现失效
安全的系统保护
♦OT输出可用于减速或关机
MAX6641
SMBus
兼容的温度监视器和
自动
PWM
风扇控制器集成器件
________________________________________________________________ Maxim Integrated Products 1
____________________________
定购信息
19-3304; Rev 0; 5/04
本文是
Maxim
正式英文资料的译文,
Maxim
不对翻译中存在的差异或由此产生的错误负责。请注意译文中可能存在文字组织或
翻译错误,如需确认任何词语的准确性,请参考
Maxim
提供的英文版资料。
索取免费样品和最新版的数据资料,请访问
Maxim
的主页:
www.maxim-ic.com.cn
____________________________
引脚配置
µMAX is a registered trademark of Maxim Integrated Products, Inc.
SMBus is a trademark of Intel Corp.
典型应用电路在本资料的最后给出
PART TEMP RANGE
MAX6641AUB90
MAX6641AUB92
MAX6641AUB94
MAX6641AUB96
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN­PACKAGE
10 µMAX 1001 000x
10 µMAX 1001 001x
10 µMAX 1001 010x
10 µMAX 1001 011x
SMBus
ADDRESS
TOP VIEW
I.C.
DXN
DXP
1
2
3
4
5
MAX6641
µMAX
10
9
8
7
6
PWMOUT
V
CC
SMBDATA
SMBCLKGND
I.C.OT
MAX6641
SMBus
兼容的温度监视器和
自动
PWM
风扇控制器集成器件
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC= +3.0V to +5.5V, TA= 0°C to +125°C, unless otherwise noted. Typical values are at VCC= 3.3V, TA= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
All Voltages Referenced to GND V
CC
, OT, SMBDATA, SMBCLK, PWMOUT...............-0.3V to +6V
DXP.........................................................…-0.3V to (V
CC
+ 0.3V)
DXN ......................................................................-0.3V to +0.8V
ESD Protection
(all pins, Human Body Model) ......…………………….±2000V
Continuous Power Dissipation (T
A
= +70°C)
10-Pin µMAX (derate 5.6mW/°C above +70°C) .......... 444mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range ............................-65°C to +150°C
Lead Temperature (soldering, 10s) ............................... +300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Operating Supply Voltage Range V
Operating Current SMBDATA, SMBCLK not switching 0.5 1 mA
External Temperature Error VCC = 3.3V
Internal Temperature Error VCC = 3.3V
Temperature Resolution
Conversion Time 200 250 300 ms
PWM Frequency Tolerance -20 +20 %
Remote-Diode Sourcing Current
DXN Source Voltage 0.7 V
I/O
OT, SMBDATA, PWMOUT Output Low Voltage
OT, SMBDATA, PWMOUT Output-High Leakage Current
SMBDATA, SMBCLK Logic-Low Input Voltage
SMBDATA, SMBCLK Logic-High Input Voltage
SMBDATA, SMBCLK Leakage Current
SMBDATA, SMBCLK Input Capacitance
CC
+25°C TR +125°C, T
= +60°C
A
0°C TR +145°C, +25°C T
0°C T 0°C T
+25°C ≤ TA +100°C -2.5 +2.5
0°C T
High level 80 100 120
Low level 8 10 12
V
I
OH
V
V
C
I
OL
IL
IH
IN
= 6mA 0.4 V
OUT
VCC = 5.5V 1 µA
VCC = 3V to 5.5V 0.8 V
VCC = 3V to 5.5V 2.1 V
= +100°C
A
+145°C,
R
+125°C
A
+125°C -4 +4
A
3.0 5.5 V
±1
±3
±4
C
8 Bits
A
5pF
°C
°C
µA
MAX6641
SMBus
兼容的温度监视器和
自动
PWM
风扇控制器集成器件
_______________________________________________________________________________________ 3
Note 1: Timing specifications guaranteed by design. Note 2: The serial interface resets when SMBCLK is low for more than t
TIMEOUT
.
Note 3: A transition must internally provide at least a hold time to bridge the undefined region (300ns max) of SMBCLK’s falling edge.
ELECTRICAL CHARACTERISTICS (continued)
(VCC= +3.0V to +5.5V, TA= 0°C to +125°C, unless otherwise noted. Typical values are at VCC= 3.3V, TA= +25°C.)
____________________________________________________________________
典型工作特性
(VCC= 3.3V, TA= +25°C, unless otherwise noted.)
OPERATING SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX6641 toc01
SUPPLY VOLTAGE (V)
OPERATING SUPPLY CURRENT (µA)
5.04.54.03.5
350
400
450
500
550
600
300
3.0 5.5
NO SMBus ACTIVITY
REMOTE TEMPERATURE ERROR
vs. REMOTE-DIODE TEMPERATURE
MAX6641 toc02
TEMPERATURE (°C)
TEMPERATURE ERROR (°C)
1007525 50
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
2.0
-2.0 0 125
LOCAL TEMPERATURE ERROR
vs. DIE TEMPERATURE
MAX6641 toc03
TEMPERATURE (°C)
TEMPERATURE ERROR (°C)
100755025
-1
0
1
2
-2 0 125
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SMBus-COMPATIBLE TIMING (Note 1) (See Figures 2, 3)
Serial Clock Frequency f
Clock Low Period t
Clock High Period t
Bus Free Time Between Stop and Start Condition
Hold Time After (Repeated) Start Condition
S M Bus S tar t C ond i ti on S etup Ti m et
Start Condition Hold Time t
Stop Condition Setup Time t
Data Setup Time t
Data Hold Time t
SCLK
LOW
HIGH
t
BUF
t
HD:STA
SU:STA
HD:STO
SU:STO
SU:DAT
HD:DAT
SMBus Fall Time t
SMBus Rise Time t
SMBus Timeout t
Startup Time After POR t
TIMEOUT
POR
(Note 2) 100 kHz
10% to 10% 4 µs
90% to 90% 4.7 µs
4.7 µs
s
90% of SMBCLK to 90% of SMBDATA 4.7 µs
10% of SMBDATA to 10% of SMBCLK 4 µs
90% of SMBCLK to 10% of SMBDATA 4 µs
10% of SMBDATA to 10% of SMBCLK 250 ns
10% of SMBCLK to 10% of SMBDATA (Note 3)
F
R
300 ns
29 37 55 ms
300 ns
1000 ns
500 ms
MAX6641
SMBus
兼容的温度监视器和
自动
PWM
风扇控制器集成器件
4 _______________________________________________________________________________________
___________________________________________________________
典型工作特性(续
)
(VCC= 3.3V, TA= +25°C, unless otherwise noted.)
REMOTE TEMPERATURE ERROR
vs. POWER-SUPPLY NOISE FREQUENCY
0
TA = +80°C, 250mV SQUARE WAVE APPLIED
, NO BYPASS CAPACITOR
AT V
-0.25
CC
MAX6641 toc04
LOCAL TEMPERATURE ERROR
vs. POWER-SUPPLY NOISE FREQUENCY
1.0
TA = +25°C, 250mV SQUARE WAVE APPLIED
, NO BYPASS CAPACITOR
AT V
CC
0.5
MAX6641 toc05
-0.50
-0.75
-1.00
TEMPERATURE ERROR (°C)
-1.25
-1.50
0.1 1000 FREQUENCY (kHz)
REMOTE TEMPERATURE ERROR
vs. DIFFERENTIAL-MODE NOISE FREQUENCY
1.5
TA = +80°C, VIN = 10mV SQUARE WAVE APPLIED TO DXP - DXN
1.0
0.5
0
TEMPERATURE ERROR (°C)
-0.5
-1.0
0.1 1000
100101
P-P
FREQUENCY (kHz)
0
-0.5
-1.0
TEMPERATURE ERROR (°C)
-1.5
-2.0
0.1 1000 FREQUENCY (kHz)
MAX6641 toc07
100101
TEMPERATURE ERROR (°C)
100101
REMOTE TEMPERATURE ERROR
vs. DXP - DXN CAPACITANCE
3
2
1
0
-1
-2
-3
-4
NORMALIZED TEMPERATURE ERROR (°C)
TA = +80°C
-5
0.1 100 DXP - DXN CAPACITANCE (nF)
REMOTE TEMPERATURE ERROR
vs. COMMON-MODE NOISE FREQUENCY
1.0
TA = +80°C, VIN = 100mV SQUARE WAVE APPLIED TO DXP
0.5
0
-0.5
-1.0
-1.5
0.1 1000 FREQUENCY (kHz)
101
P-P
MAX6641 toc08
100101
MAX6641 toc06
PWM FREQUENCY ERROR
vs. DIE TEMPERATURE
2
1
0
-1
PWM FREQUENCY ERROR (Hz)
-2
-3
-50 125
TEMPERATURE (°C)
2.0
MAX6641 toc09
1007550250-25
1.5
1.0
0.5
0
PWM FREQUENCY ERROR (Hz)
-0.5
-1.0
PWM FREQUENCY ERROR
vs. SUPPLY VOLTAGE
TA = +25°C
3.0 5.5 SUPPLY VOLTAGE (V)
5.04.54.03.5
MAX6641 toc10
____________________________
详细说明
MAX6641
是温度传感器和风扇控制器能够准确地测量
自身管芯的温度以及远端PN结的温度该器件使用2线 串行接口以数字形式报告温度值远端PN结通常是
CPU、FPGA或ASIC
上共集极
PNP
的发射结
MAX6641
工作在
3.0V至5.5V
电源电压范围内消耗电源电流的典
型值为
500µA
温度数据控制
PWM
输出信号来调节冷 却风扇的速度该器件还具有高温告警输出用来产生 中断减速信号或关断信号
SMBus
数字接口
从软件的角度来看
MAX6641
可以看作是一组字单节宽
的寄存器其中包含了温度数据告警阈值数据以及 各个控制位标准的
SMBus
兼容2线串行接口用来读取
温度数据并写入控制位以及告警阈值数据这些器件 响应相同的
SMBus
从机地址来访问所有的功能
MAX6641
使用到4种标准的
SMBus
协议写字节、读
字节发送字节和接收字节(图1、图2和图3)。更短的 接收字节协议可以实现更快的传输前提是通过读字节 指令预先选择了正确的数据寄存器在多主机系统中 使用短协议时应谨慎另一个主机可能在没有通知第一 个主机的情况下覆盖命令字节
MAX6641
可以采用四种
不同的从机地址因此最多可以有四个
MAX6641
共享
同一条总线
范围在
0°C至+255°C
以内的温度数据可以从读外部温
寄存器
(00h)
中读取;范围在
0°C至+125°C
以内的温
度数据可以从读内部温度寄存器
(01h)
中读取这些
寄存器的温度数据格式为8位,其
LSB
代表
+1°C (表1)
MSB
+128°C。MSB
最先发送所有低于
0°C
的数值
都被固定为
00h
表1详细说明了寄存器地址与功能可读还是可写以及
上电复位
(POR)
状态所有寄存器的功能说明参见表1-
以及寄存器
说明部分
4为
MAX6641
的框图
MAX6641
SMBus
兼容的温度监视器和
自动
PWM
风扇控制器集成器件
_______________________________________________________________________________________ 5
_____________________________________________________________________
引脚说明
引脚
名称 功能
内部已连接必须连接至
GND
接地
低电平有效漏极开路的高温输出OT可以用作中断系统关断信号或用来控制时钟减速 无论
V
CC
上的电源电压是多少OT都可以被上拉至
5.5V。V
CC
= 0时OT
为高阻状态
SMBus
串行时钟输入
SMBCLK
可以被上拉至
5.5V
而与
V
CC
无关漏极开路
VCC= 0
SMBCLK
为高阻状态
SMBus
串行数据输入/输出
SMBDATA
可以被上拉至
5.5V
而与
V
CC
无关漏极开路
V
CC
= 0时SMBDATA
为高阻状态
正电源
0.1µF
旁路至
GND
连接至风扇驱动晶体管的
PWM
输出
PWMOUT与MOSFET
栅极或双极型晶体管的基极相连
PWM
波形来驱动风扇的电源供电若风扇具有直接速度控制能力
PWM
输出可以连接至风扇
PWM
输入端;也可以选择将
PWM
输出转换成直流电压来驱动风扇的电源供电
PWMOUT
需要
上拉电阻上拉电阻可以被连接到最高
5.5V
的电源电压上而与
V
CC
无关
远端二极管阴极连接与
A/D
负输入的组合将作为远端二极管的温度测量晶体管阴极连接至
DXN
远端二极管电流源与远端二极管通道
A/D
正输入的组合
DXP
连接作为远端二极管的温度测量晶体
管阳极不要让
DXP
浮空;如果不使用远端二极管则与
DXN
连接为了滤去噪声
DXP与DXN
之间连接一个
2200ρF
的电容
PIN NAME FUNCTION
1, 6 I.C. Internally Connected. Must be connected to GND.
2 DXN
3 DXP
4 GND Ground
5 OT
7 SMBCLK
8 SMBDATA
9VCCPositive Supply. Bypass with a 0.1µF capacitor to GND.
10 PWMOUT
Combined Remote-Diode Cathode Connection and A/D Negative Input. Connect the cathode of the remote-diode-connected transistor to DXN.
Combined Remote-Diode Current Source and A/D Positive Input for Remote-Diode Channel. Connect DXP to the anode of a remote-diode-connected temperature-sensing transistor. DO NOT LEAVE DXP FLOATING; connect to DXN if no remote diode is used. Place a 2200pF capacitor between DXP and DXN for noise filtering.
Active-Low, Open-Drain, Over-Temperature Output. Use OT as an interrupt, a system shutdown signal, or to control clock throttling. OT can be pulled up to 5.5V, regardless of the voltage on VCC. OT is high impedance when V
SMBus Serial Clock Input. SMBCLK can be pulled up to 5.5V, regardless of V SMBCLK is high impedance when V
SMBus Serial Data Input/Output. SMBDATA can be pulled up to 5.5V, regardless of V SMBDATA is high impedance when V
PWM Output to Fan Power Transistor. Connect PWMOUT to the gate of a MOSFET or the base of a bipolar transistor to drive the fan’s power supply with a PWM waveform. Alternatively, the PWM output can be connected to the PWM input of a fan with direct speed-control capability, or it can be converted to a DC voltage for driving the fan’s power supply. PWMOUT requires a pullup resistor. The pullup resistor can be connected to a voltage supply up to 5.5V, regardless of V
= 0.
CC
= 0.
CC
CC
= 0.
. Open drain.
CC
CC
.
CC
. Open drain.
MAX6641
SMBus
兼容的温度监视器和
自动
PWM
风扇控制器集成器件
6 _______________________________________________________________________________________
1.
寄存器功能
READ/ WRITE
R/W 02h 0000 00xx
R/W 03h 0110 1110
R/W 04h 0101 0000
REGISTER
ADDRESS
R 00h 0000 0000
R 01h 0000 0000
POR
STATE
FUNCTION/
NAME
Read remote
(external)
temperature
Read local
(internal)
temperature
Configuration
byte
Remote-diode
temperature
OT limit
Local-diode temperature
OT limit
D7 D6 D5 D4 D3 D2 D1 D0
MSB
(+128°C)
MSB
(+128°C)
Reserved set to 0
MSB
(+128°C)
MSB
(+128°C)
(+64°C) (+32°C) (+16°C) (+8°C) (+4°C) (+2°C)
(+64°C) (+32°C) (+16°C) (+8°C) (+4°C) (+2°C)
Reserved
set to 0
(+64°C) (+32°C) (+16°C) (+8°C) (+4°C) (+2°C)
(+64°C) (+32°C) (+16°C) (+8°C) (+4°C) (+2°C)
Timeout: 0 = enabled, 1 =
disabled
Fan
PWM
invert
Min duty
cycle: 0 = 0%, 1 = fan-
start duty
cycle
Spin-up disable
LSB
(+1°C)
LSB
(+1°C)
XX
LSB
(+1°C)
LSB
(+1°C)
R 05h 00xx xxxx OT status
R/W 06h 00xx xxxx OT mask
R/W 07h
R/W 08h
R/W 09h 0000 000x
R 0Ah 0000 000x
R/W 0Bh 0000 0000
0110 000x
(96 = 40%)
1111 000x
(240 = 100%)
Fan-start duty
cycle
Fan maximum
duty cycle
Fan target duty
cycle
Fan
instantaneous
duty cycle
Remote-diode
fan-start
temperature
Remote 1
= fault
Remote 1 = masked
MSB
(128/240)
MSB
(128/240)
MSB
(128/240)
MSB
(128/240)
MSB
(+128°C)
Local 1 =
fault
Local 1 =
masked
(64/240) (32/240) ( 16/240) (8/240) (4/240)
(64/240) (32/240) ( 16/240) (8/240) (4/240)
(64/240) (32/240) ( 16/240) (8/240) (4/240)
(64/240) (32/240) ( 16/240) (8/240) (4/240)
(+64°C) (+32°C) (+16°C) (+8°C) (+4°C) (+2°C)
XXXXXX
XXXXXX
LSB
(2/240)
LSB
(2/240)
LSB
(2/240)
LSB
(2/240)
X
X
X
X
LSB
(+1°C)
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