General Description
The MAX6678 monitors its own temperature and the
temperatures of two external diode-connected transis-
tors, which typically reside on the die of a CPU or other
integrated circuit. The device reports temperature values
in digital form using a 2-wire serial interface. The
MAX6678 provides a programmable alarm output to gen-
erate interrupts, throttle signals, or overtemperature shut-
down signals.
The 2-wire serial interface accepts standard System
Management Bus (SMBus)
"
write byte, read byte, send
byte, and receive byte commands to read the tempera-
ture data and program the alarm thresholds. The tem-
perature data controls a PWM output signal to adjust
the speed of a cooling fan, thereby minimizing noise
when the system is running cool, but providing maxi-
mum cooling when power dissipation increases.
Five GPIO pins provide additional flexibility. The GPIO
power-up states are set by connecting the GPIO preset
inputs to ground or V
CC
.
The MAX6678 is available in a 20-pin QSOP package
and a 5mm x 5mm thin QFN package. It operates from
3.0V to 5.5V and consumes just 500礎 of supply current.
Applications
Desktop Computers
Notebook Computers
Workstations
Servers
Networking Equipment
Features
f Two Thermal-Diode Inputs
f Local Temperature Sensor
f Five GPIO Input/Outputs
f Two PWM Outputs for Fan Drive (Open Drain; May
Be Pulled Up to +5V)
f Programmable Fan-Control Characteristics
f Automatic Fan Spin-Up Ensures Fan Start
f Controlled Rate of Change Ensures Unobtrusive
Fan-Speed Adjustments
f 1?SPAN class="pst MAX6678AEP92-_2614429_3">C Remote Temperature Accuracy (+60?SPAN class="pst MAX6678AEP92-_2614429_3">C to
+145?/SPAN>C)
f Temperature Monitoring Begins at POR for Fail-
Safe System Protection
f OT Output for Throttling or Shutdown
f Four Versions Available, Each with a Different
Address
f 5mm x 5mm TQFN Package
2-Channel Temperature Monitor with Dual Automatic
PWM Fan-Speed Controller and Five GPIOs
________________________________________________________________ Maxim Integrated Products 1
20 19 18 17
16
13
12
11
14
15
GPIO3
GPIO2
GPIO1
OT
PRESET0
4
3
2
1
PRESET4
GPIO4
SMBCLK
SMBDATA
5
DXP1
6
7
8
9
10
MAX6678
*CONNECT EXPOSED
PADDLE TO GND
TOP VIEW
5mm x 5mm THIN QFN
Pin Configurations
Ordering Information
19-3306; Rev 0; 5/04
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxims website at www.maxim-ic.com.
*EP = Exposed paddle.
PART
TEMP RANGE
PIN-
PACKAGE
SMBus
ADDRESS
MAX6678AEP90 -40癈 to +125癈 20 QSOP
1001000
MAX6678AEP92 -40癈 to +125癈 20 QSOP
1001001
MAX6678AEP94 -40癈 to +125癈 20 QSOP
1001010
MAX6678AEP96 -40癈 to +125癈 20 QSOP
1001011
MAX6678ATP90 -40癈 to +125癈
20 Thin
QFN-EP*
1001000
MAX6678ATP92 -40癈 to +125癈
20 Thin
QFN-EP*
1001001
MAX6678ATP94 -40癈 to +125癈
20 Thin
QFN-EP*
1001010
MAX6678ATP96 -40癈 to +125癈
20 Thin
QFN-EP*
1001011
SMBus is a trademark of Intel Corp.
Pin Configurations continued at end of data sheet.
Typical Operating Circuit appears at end of data sheet.
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相关代理商/技术参数
MAX6678AEP92+T
功能描述:板上安装温度传感器 2Ch Temperature Monitor RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor
MAX6678AEP92-T
功能描述:板上安装温度传感器 2Ch Temperature Monitor RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor
MAX6678AEP94
功能描述:板上安装温度传感器 RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor
MAX6678AEP94+
制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX6678AEP94-T
功能描述:板上安装温度传感器 RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor
MAX6678AEP96
功能描述:板上安装温度传感器 RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor
MAX6678AEP96-T
功能描述:板上安装温度传感器 RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor
MAX6678ATP90
功能描述:板上安装温度传感器 RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor