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參數資料
| 型號： | LM91 |
| 文件頁數： | 1/14頁 |
| 文件大小： | 184K |
| 代理商： | LM91 |
LM91
Diode Input Digital Temperature Sensor with Two-Wire
Interface
General Description
The
LM91
is
a
remote
diode
temperature
sensor,
Delta-Sigma
analog-to-digital
converter,
and
digital
over-temperature detector with an SMBus
interface. The
LM91 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 LM91 at any time to read the temperature
of this diode as well as the temperature state of the LM91
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. Power up default values for T_CRIT are as
shown in the ordering information table. Three state logic
inputs allow two pins (ADD0, ADD1) to select up to 9 SMBus
address locations for the LM91.
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 LM91s to be connected
to a single bus
Key Specifications
j
Supply Voltage
j
Supply Current
j
Local Temperature Accuracy
j
Remote Diode Temperature Accuracy
3.0V - 3.6V
1 mA (max)
±
1.0C (typ)
+60C to +100C
0C to +125C
±
4C (max)
±
6C (max)
Applications
n
System Thermal Management
n
Personal Computers
n
Electronic Test Equipment
n
Office Electronics
n
HVAC
Simplified Block Diagram
20034301
#
Indicates Active Low (”NOT“)
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.
November 2001
L
2001 National Semiconductor Corporation
DS200343
www.national.com
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|---|---|
| LM91-1001 | 制造商:FLOWLINE 功能描述:Single Indicator, Non-Windowed, 1/8 DIN, PC |
| LM91-2001 | 制造商:FLOWLINE 功能描述:Two Indicator, Non-Windowed, 1/8 DIN, PC |
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| LM9140BYZ-10.0 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Precision Micropower Shunt Voltage Reference |
| LM9140BYZ-4.1 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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