收藏本站
NCT7491
http://onsemi.com
52
Table 59. PECI T
MIN
 REGISTER (PowerOn Default = 0x80)
Register Address
R/W
Description
PowerOn Default
0x3B
R/W
PECI T
MIN
When the PECI measurement exceeds PECI T
MIN
 the appropriate fans run at
PWM
MIN
 and increase according to the automatic fan speed control slope.
If Absolute PECI mode is used then the maximum valid Tmin value is 175癈.
0xD6 (42癈)
Table 60. REGISTER 0x3C  PECI T
RANGE
  (PowerOn Default = 0xC0)
Bit
Name
R/W
1
Description
<2:0>
Reserved
R
< 3 >
Reserved
R
<7:4>
T
RANGE
R/W
These bits determine the PWM duty cycle vs. the PECI temperature range for automatic
fan control.
0000 = 2癈
0001 = 2.5癈
0010 = 3.33癈
0011 = 4癈
0100 = 5癈
0101 = 6.67癈
0110 = 8癈
0111 = 10癈
1000 = 13.33癈
1001 = 16癈
1010 = 20癈
1011 = 26.67癈
1100 = 32癈 (default)
1101 = 40癈
1110 = 53.33癈
1111 = 80癈
Table 61. PECI0 T
CONTROL
 LIMIT REGISTER (Note 17)
Register Address
R/W
Description
PowerOn Default
0x3D
R/W
PECI0 T
CONTROL
 limit.
0x00
17.If any PECI reading exceeds the T
CONTROL
 limit, all PWM outputs drive their fans at 100% duty cycle. This is a failsafe mechanism
incorporated to cool the system in the event of a critical overtemperature. It also ensures some level of cooling in the event that software
or hardware locks up. If set to 0x80, this feature is disabled. The PWM output remains at 100% until the temperature drops below T
CONTRO
limit  hysteresis.
Table 62. COMPANY ID REGISTER
Register Address
R/W
Description
PowerOn Default
0x3E
Read
Company ID
0x1A
Table 63. REGISTER 0x3F VERSION/REVISION REGISTER (PowerOnDefault = 0x6C)
Bit
Name
R/W
Description
<1:0>
REV
Read
These two bits indicate the NCT7491 silicon revision number. 0x00 indicates rev 0, 0x01 indic-
ates Rev 1 etc&
<2>
PECI
Read
This bit is set to 1 indicating that the NCT7491 supports the PECI interface
<3>
4 Wire
Read
This bit is set to 1 indicating that the NCT7491 may be configured to drive 4wire fans using high
frequency PWM.
<7:4>
VER
Read
These bits indicate the Heceta version number of the device.
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
NCT75MNR2G IC SENSOR TEMP DGTL 8DFN
NCV8881PWR2G IC REG TRPL BUCK/LINEAR 16SOIC
NE1617ADS,112 IC TEMP MONITOR 16SSOP
NE1619DS,118 IC TEMP MONITOR 16SSOP
NIS5112D1R2G IC ELECTRONIC FUSE HOTSWAP 8SOIC
NIS5132MN2TXG IC ELECTRONIC FUSE 12V 10DFN
NIS5132MN3TXG IC ELECTRONIC FUSE 12V 10-DFN
NSI45015WT1G IC LED DRIVER LINEAR SOD-123
相关代理商/技术参数
NCT75DMR2G 功能描述:板上安装温度传感器 2-Channel Digital Thermometer w/ Alarm 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
NCT75DR2G 功能描述:板上安装温度传感器 2-Channel Digital Thermometer w/ Alarm 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
NCT75MNR2G 功能描述:板上安装温度传感器 HAS2MONOJLCC84SPACE 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
NCT7717U TR 制造商:Nuvoton Technology Corp 功能描述:SMBUS INTERFACE TEMP. SENSOR W 制造商:Nuvoton Technology Corp 功能描述:IC SMBUS TEMP SENSOR 8MSOP
NCT7718W TR 制造商:Nuvoton Technology Corp 功能描述:IC SMBUS TEMP SENSOR 8MSOP
NCT7802Y 制造商:Nuvoton Technology Corp 功能描述:
NCT7904D 制造商:Nuvoton Technology Corp 功能描述:IC H/W MONITOR
NCT80DBR2G 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