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參數資料
| 型號： | LM76CNM-3 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | 【0.5∑C, 【1∑C, 12-Bit Sign Digital Temperature Sensor and Thermal Window Comparator with Two-Wire Interface |
| 中文描述： | DIGITAL TEMP SENSOR-SERIAL, 13BIT(s), 1Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁數： | 1/15頁 |
| 文件大小： | 311K |
| 代理商： | LM76CNM-3 |
LM76
±
0.5C,
±
1C, 12-Bit + Sign Digital Temperature Sensor
and Thermal Window Comparator with Two-Wire
Interface
General Description
The LM76 is a digital temperature sensor and thermal win-
dow comparator with an I
2
C
Serial Bus interface with an
accuracy of
±
1C. This accuracy for the LM76CHM is speci-
fied for a 10C to 45C temperature range, while for the
LM76CNM the temperature range is 70C to 100C. The
LM76CHM is specified with an accuracy
±
0.5C at 25C. The
window-comparator architecture of the LM76 eases the de-
sign of temperature control systems conforming to the ACPI
(Advanced Configuration and Power Interface) specification
for personal computers. The open-drain Interrupt (INT) out-
put becomes active whenever temperature goes outside a
programmable window, while a separate Critical Tempera-
ture Alarm (T_CRIT_A) output becomes active when the
temperature exceeds a programmable critical limit. The INT
output can operate in either a comparator or event mode,
while the T_CRIT_A output operates in comparator mode
only.
The host can program both the upper and lower limits of the
window as well as the critical temperature limit. Program-
mable hysterisis as well as a fault queue are available to
minimize false tripping. Two pins (A0, A1) are available for
address selection. The sensor powers up with default thresh-
olds of 2C T
HYST
, 10C T
LOW
, 64C T
HIGH
, and 80C
T_CRIT.
The LM76’s 3.3V and 5.0V supply voltage, Serial Bus inter-
face, 12-bit + sign output, and full-scale range of over 127C
make it ideal for a wide range of applications. These include
thermal management and protection applications in personal
computers, electronic test equipment, office electronics and
bio-medical applications.
Features
n
Window comparison simplifies design of ACPI
compatible temperature monitoring and control.
n
Serial Bus interface
n
Separate open-drain outputs for Interrupt and Critical
Temperature shutdown
n
Shutdown mode to minimize power consumption
n
Up to 4 LM76s can be connected to a single bus
n
12-bit + sign output; full-scale reading of over 127C
Key Specifications
n
Supply Voltage
n
Supply Current
3.3V or 5.0V
250 μA (typ)
450 μA (max)
8 μA (max)
±
0.5C(max)
±
1.0C(max)
±
1.0C(max)
0.0625C
operating
shutdown
+25C
n
Temperature
Accuracy
10C to +45C
70C to 100C
n
Resolution
Applications
n
System Thermal Management
n
Personal Computers
n
Office Electronics
n
HVAC
I2C
is a registered trademark of Philips Corporation.
January 2000
L
0
1
w
2000 National Semiconductor Corporation
DS101015
www.national.com
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