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参数资料
| 型号： | LM85BIMQ/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO24 |
| 封装： | QSOP-24 |
| 文件页数： | 10/26页 |
| 文件大小： | 261K |
| 代理商： | LM85BIMQ/NOPB |
Functional Description (Continued)
In Auto Fan Mode, when the temperature for a zone is above the Temperature Limit (Registers 67-69h) and below its Absolute
Temperature Limit (Registers 6A-6Ch), the speed of a fan assigned to that zone is determined as follows.
When the temperature reaches the Fan Temp Limit for a zone, the PWM output assigned to that zone will be Fan PWM Minimum.
Between Fan Temp Limit and (Fan Temp Limit + Range), the PWM duty cycle will increase linearly according to the temperature
as shown in the figure below. The PWM duty cycle will be 100% at (Fan Temp Limit + Range).
Example for PWM1 assigned to Zone 1:
– Zone 1 Fan Temp Limit (Register 67h) is set to 50C (32h).
– Range (Register 5Fh) is set to 8C (6xh).
– Fan 1 PWM Minimum (Register 64h) is set to 50% (32h).
In this case, the PWM1 duty cycle will be 50% at 50C.
Since (Zone 1 Fan Temp Limit) + (Zone 1 Range) = 50C + 8C = 58C, the fan will run at 100% duty cycle when the temperature
of the Zone 1 sensor reaches 58C.
Since the midpoint of the fan control range is 54C, and the median duty cycle is 75% (Halfway between the PWM Minimum and
100%), PWM1 duty cycle would be 75% at 54C.
Above (Zone 1 Fan Temp Limit) + (Zone 1 Range), the duty cycle will be 100%.
PWM frequency bits [3:0]
The PWM frequency bits [3:0] determine the PWM frequency for the fan.
PWM Frequency Selection (Default = 011 = 30.04 Hz)
TABLE 6. Register Setting vs PWM Frequency
Freq [2:0]
PWM Frequency (Exact frequencies vary by
manufacturer)
National Actual PWM Frequency
000
10 Hz
10.01 Hz
001
15 Hz
15.02 Hz
010
23 Hz
23.14 Hz
011
30 Hz
30.04 Hz
100
38 Hz
38.16 Hz
101
47 Hz
47.06 Hz
110
62 Hz
61.38 Hz
111
94 Hz
94.12 Hz
Range Selection RAN [3:0]
RAN [3:0]
Range (C)
0000
2
0001
2.5
0010
3.33
20035306
FIGURE 1. Fan Activity above Fan Temp Limit
LM85
www.national.com
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相关代理商/技术参数 |
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| LM85BIMQX | 制造商:Rochester Electronics LLC 功能描述:SYSTEM HDW MONITOR W/FAN CNTRL - Bulk |
| LM85BIMQX/NOPB | 制造商:Texas Instruments 功能描述:Temp Sensor Digital Serial (2-Wire) 24-Pin QSOP T/R |
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| LM86CIM | 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 |
| LM86CIM/NOPB | 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 |
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