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| 型号： | LM80CIMTX-32 |
| 厂商： | National Semiconductor Corporation |
| 英文描述： | Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor |
| 中文描述： | 串行接口ACPI的兼容微处理器系统硬件监视器 |
| 文件页数： | 5/29页 |
| 文件大小： | 412K |
| 代理商： | LM80CIMTX-32 |
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Functional Description (Continued)
A typical application, such as is shown in
Figure 6, might se-
lect the input voltage divider to provide 1.9V at the analog in-
puts of the LM80. This is sufficiently high for good resolution
of the voltage, yet leaves headroom for upward excursions
from the supply of about 25%. To simplify the process of re-
sistor selection, set the value of R2 first. Select a value for
R2 or R4 between 10 k
and 100 k This is low enough to
avoid errors due to input leakage currents yet high enough to
both protect the inputs under overdrive conditions as well as
minimize loading of the source. Then select R1 or R3 to pro-
vide a 1.9V input as show in
Figure 6.
For positive input voltages the equation for calculating R1 is
as follows:
R1 = [(V
S VIN)/VIN]R2
For negative input voltages the equation for Calculating R3
is as follows:
R3=[(V
S VIN)/(VIN 5V)] R4
The analog inputs have internal diodes that clamp inputs ex-
ceeding the power supply and ground. Exceeding any ana-
log input has no detrimental effect on other channels. The in-
put diodes will also clamp voltages appearing at the inputs of
an un-powered LM80. External resistors should be included
to limit input currents to the values given in the ABSOLUTE
MAXIMUM RATINGS for Input Current At Any Pin. Inputs
with the attenuator networks will usually meet these require-
ments. If it is possible for inputs without attenuators to be
turned on while LM80 is powered off, additional resistors of
about 10 k
should be added in series with the inputs to limit
the input current.
Voltage
Measure-
ments
(V
S)
R1 or
R3
R2 or
R4
Voltage
at
Analog Inputs
( ADC code 190)
+2.5V
23.7 k
75 k
+1.9V
+3.3V
22.1 k
30 k
+1.9V
+5.0V
24 k
14.7 k
+1.9V
+12V
160 k
30.1 k
+1.9V
12V
160 k
35.7 k
+1.9V
5V
36 k
16.2 k
+1.9V
5.0 LAYOUT AND GROUNDING
Analog inputs will provide best accuracy when referred to the
AGND pin or a supply with low noise. A separate,
low-impedance ground plane for analog ground, which pro-
vides a ground point for the voltage dividers and analog
components, will provide best performance but is not man-
datory. Analog components such as voltage dividers should
be located physically as close as possible to the LM80.
The power supply bypass, the parallel combination of 10 F
(electrolytic or tantalum) and 0.1 F (ceramic) bypass ca-
pacitors connected between pin 9 and ground, should also
be located as close as possible to the LM80.
DS100040-11
FIGURE 6. Input Examples. Resistor values shown in
table provide approximately 1.9V at the analog inputs.
www.national.com
13
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|---|---|
| LM80CIMTX-5 | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| LM80CIMTX-5/NOPB | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| LM80CIMTX-52 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor |
| LM80EVAL | 功能描述:EVALUATION BOARD FOR LM80 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:PowerWise® 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- 主要目的:电源管理，电池充电器 嵌入式:否 已用 IC / 零件:MAX8903A 主要属性:1 芯锂离子电池 次要属性:状态 LED 已供物品:板 |
| LM81 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor |
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