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| 型号： | LM92CIM/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 8/25页 |
| 文件大小： | 1472K |
| 描述： | IC SENSOR/THERM COMP DIG 8-SOIC |
| 标准包装： | 95 |
| 系列： | PowerWise® |
| 功能： | 温度监控系统（传感器） |
| 传感器类型： | 内部 |
| 感应温度： | -55°C ~ 150°C |
| 精确度： | ±1.5°C（最小值） |
| 拓扑： | ADC，比较器，寄存器库 |
| 输出类型： | 2 线串行，I²C? |
| 输出警报： | 是 |
| 输出风扇： | 无 |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -55°C ~ 150°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOP |
| 包装： | 管件 |
| 产品目录页面： | 1314 (CN2011-ZH PDF) |
| 其它名称： | *LM92CIM *LM92CIM/NOPB LM92CIM |
LM 92
SNIS110D MARCH 2000REVISED MARCH 2013
www.ti.com
FUNCTIONAL DESCRIPTION
The LM92 temperature sensor incorporates a band-gap type temperature sensor, 13-bit ADC, and a digital
comparator with user-programmable upper and lower limit values. The comparator activates either the INT line
for temperatures outside the T
LOW
and T
HIGH
window, or the T_CRIT_A line for temperatures which exceed
T_CRIT. The lines are programmable for mode and polarity.
TEMPERATURE COMPARISON
LM92 provides a window comparison against a lower (T
LOW
) and upper (T
HIGH
) trip point. A second upper trip
point (T_CRIT) functions as a critical alarm shutdown. Figure 7 depicts the comparison function as well as the
modes of operation.
Status Bits
The internal Status bits operate as follows:
True : Temperature above a T
HIGH
or T_CRIT is true for those respective bits. A true for T
LOW
is
temperature below T
LOW
.
False : Assuming temperature has previously crossed above T
HIGH
or T_CRIT, then the temperature must
drop below the points corresponding T
HYST
(T
HIGH
T
HYST
or T_CRIT T
HYST
) in order for the condition to be
false. For T
LOW
, assuming temperature has previously crossed below T
LOW
, a false occurs when temperature
goes above T
LOW
+ T
HYST
.
The Status bits are not affected by reads or any other actions, and always represent the state of temperature vs.
setpoints.
Hardwire Outputs
The T_CRIT_A hardwire output mirrors the T_CRIT_A flag, when the flag is true, the T_CRIT_A output is
asserted at all times regardless of mode. Reading the LM92 has no effect on the T_CRIT_A output, although the
internal conversion is restarted.
The behavior of the INT hardwire output is as follows:
Comparator Interrupt Mode (Default): User reading part resets output until next measurement completes. If
condition is still true, output is set again at end of next conversion cycle. For example, if a user never reads the
part, and temperature goes below T
LOW
then INT becomes active. It would stay that way until temperature goes
above T
LOW
+ T
HYST
. However if the user reads the part, the output would be reset. At the end of the next
conversion cycle, if the condition is true, it is set again. If not, it remains reset.
Event Interrupt Mode: User reading part resets output until next condition "event" occurs (in other words,
output is only set once for a true condition, if reset by a read, it remains reset until the next triggering threshold
has been crossed). Conversely, if a user never read the part, the output would stay set indefinitely after the first
event that set the output. An event for Event Interrupt Mode is defined as:
1. Transitioning upward across a setpoint, or
2. Transitioning downward across a setpoint's corresponding hysteresis (after having exceeded that setpoint).
For example, if a user never read the part, and temperature went below T
LOW
then INT would become active. It
would stay that way forever if a user never read the part.
However if the user read the part, the output would be reset. Even if the condition is true, it will remain reset. The
temperature must cross above T
LOW
+ T
HYST
to set the output again.
In either mode, reading any register in the LM92 restarts the conversion. This allows a designer to know exactly
when the LM92 begins a comparison. This prevents unnecessary Interrupts just after reprogramming setpoints.
Typically, system Interrupt inputs are masked prior to reprogramming trip points. By doing a read just after
resetting trip points, but prior to unmasking, unexpected Interrupts are prevented.
Avoid programming setpoints so close that their hysteresis values overlap. An example would be that with a
T
HYST
value of 2 癈 then setting T
HIGH
and T
LOW
to within 4 癈 of each other will violate this restriction. To be
more specific, with T
HYST
set to 2 癈 assume T
HIGH
set to 64 癈. If T
LOW
is set equal to, or higher than 60 癈 this
restriction is violated.
8
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Copyright ?20002013, Texas Instruments Incorporated
Product Folder Links: LM92
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM92CIMX | 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 |
| LM92CIMX/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 |
| LM92CIMXNOPB | 制造商:National Semiconductor 功能描述:Temp Sensor Digital Serial (2-Wire) 8-Pin SOIC N T/R |
| LM93 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Hardware Monitor with Integrated Fan Control for Server Management |
| LM93-1001 | 制造商:FLOWLINE 功能描述:Two Indicator, Windowed, 1/8 DIN, PC (13.9"h x 8.5"w x 6.7"d) |
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