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參數資料
| 型號： | LM84 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Diode Input Digital Temperature Sensor with Two-Wire Interface |
| 中文描述： | 二極管輸入數字溫度傳感器兩線接口 |
| 文件頁數： | 1/16頁 |
| 文件大小： | 168K |
| 代理商： | LM84 |
LM84
Diode Input Digital Temperature Sensor with Two-Wire
Interface
General Description
The
LM84
is
a
remote
diode
temperature
sensor,
Delta-Sigma
analog-to-digital
converter,
and
digital
over-temperature detector with an SMBus
interface. The
LM84 senses its own temperature as well as the tempera-
ture of a target IC with a diode junction, such as a Pentium
II processor or a diode connected 2N3904. A diode junction
(semiconductor junction) is required on the target IC’s die. A
host can query the LM84 at any time to read the temperature
of this diode as well as the temperature state of the LM84
itself. A T_CRIT_A interrupt output becomes active when the
temperature is greater than a programmable comparator
limit, T_CRIT.
The host can program as well as read back the state of the
T_CRIT register. Three state logic inputs allow two pins
(ADD0,ADD1) to select up to 9 SMBus address locations for
the LM84. The sensor powers up with default thresholds of
127C for T_CRIT.
Features
n
Directly senses die temperature of remote ICs
n
Senses temperature of remote diodes
n
SMBus compatible interface, supports SMBus Timeout
n
Register readback capability
n
7 bit plus sign temperature data format
n
2 address select lines enable 9 LM84s to be connected
to a single bus
Key Specifications
j
Supply Voltage
j
Supply Current
j
Local Temperature Accuracy
j
Remote Diode Temperature Accuracy
+60C to +100C
0C to +125C
3.0V - 3.6V
1 mA (max)
±
1.0C (typ)
±
3C (max)
±
5C (max)
Applications
n
System Thermal Management
n
Personal Computers
n
Electronic Test Equipment
n
Office Electronics
n
HVAC
Simplified Block Diagram
SMBus
is a trademark of the Intel Corporation.
II processor is a registered trademark of the Intel Corporation.
Pentium
is a registered trademark of the Philips Corporation.
DS100961-1
#
Indicates Active Low (”NOT“)
July 2000
L
2001 National Semiconductor Corporation
DS100961
www.national.com
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