參數(shù)資料
型號(hào)： LM92CIMX/NOPB
廠(chǎng)商： National Semiconductor
文件頁(yè)數(shù)： 8/25頁(yè)
文件大小： 1472K
描述： IC SENSOR TEMP/THERM COMP 8-SOIC
標(biāo)準(zhǔn)包裝： 2,500
系列： PowerWise®
功能： 溫度監(jiān)控系統(tǒng)（傳感器）
傳感器類(lèi)型： 內(nèi)部
感應(yīng)溫度： -55°C ~ 150°C
精確度： ±1.5°C（最小值）
拓?fù)洌?/td> ADC，比較器，寄存器庫(kù)
輸出類(lèi)型： 2 線(xiàn)串行，I²C?
輸出警報(bào)： 是
輸出風(fēng)扇： 無(wú)
電源電壓： 2.7 V ~ 5.5 V
工作溫度： -55°C ~ 150°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 8-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 8-SOP
包裝： 帶卷 (TR)
其它名稱(chēng)： *LM92CIMX
*LM92CIMX/NOPB
LM92CIMX
LM92CIMX-ND
LM92CIMX/NOPBTR
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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