LM84CIMQA PDF даташит
Спецификация LM84CIMQA изготовлена «National Semiconductor» и имеет функцию, называемую «Diode Input Digital Temperature Sensor with Two-Wire Interface». |
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Детали детали
Номер произв | LM84CIMQA |
Описание | Diode Input Digital Temperature Sensor with Two-Wire Interface |
Производители | National Semiconductor |
логотип |
16 Pages
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June 1999
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 it-
self. 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
127˚C 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
n Supply Voltage
n Supply Current
n Local Temperature Accuracy
n Remote Diode Temperature Accuracy
+60˚C to +100˚C
0˚C to +125˚C
3.0V - 3.6V
1 mA (max)
±1.0˚C (typ)
±3˚C (max)
±5˚C (max)
Applications
n System Thermal Management
n Personal Computers
n Electronic Test Equipment
n Office Electronics
n HVAC
Simplified Block Diagram
# Indicates Active Low (”NOT“)
SMBus™ is a trademark of the Intel Corporation.
Pentium II® is a registered trademark of the Intel Corporation.
I2C® is a registered trademark of the Philips Corporation.
© 1999 National Semiconductor Corporation DS100961
DS100961-1
www.national.com
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Connection Diagram
QSOP-16
Ordering Information
Order
Number
LM84CIMQA
LM84CIMQAX
NS
Package
Number
MQA16A
(QSOP-16)
MQA16A
(QSOP-16)
Transport
Media
95 Units in
Rail
2500 Units on
Tape and
Reel
TOP VIEW
Typical Application
DS100961-2
DS100961-3
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Pin Descriptions
Label
Pin #
NC
1, 5, 9,
13, 16
VCC
D+
D−
ADD0–ADD1
GND
T_CRIT_A
SMBData
SMBCLK
NC
2
3
4
10, 6
7, 8
11
12
14
15
Function
Manufacturing test pins.
Positive Supply Voltage
Input
Diode Current Source
Diode Return Current
Sink
User-Set SMBus (I2C)
Address Inputs
Power Supply Ground
Critical Temperature
Alarm, open-drain output
SMBus (I2C) Serial
Bi-Directional Data Line,
open-drain output
SMBus (I2C) Clock Input
No Connection
Typical Connection
Left floating. PC board traces may be routed
through the pads for these pins. Although, the
components that drive these traces should share
the same supply as the LM84 so that the Absolute
Maximum Voltage at any Pin rating is not violated.
DC Voltage from 3.0V to 3.6V
To Diode Anode. Connected to remote discrete
diode or to the diode on the external IC whose die
temperature is being sensed.
To Diode Cathode. Must be grounded when not
used.
Ground (Low, “0”), VCC (High, “1”) or open
(“TRI-LEVEL”)
Ground
Pull Up Resistor, Controller Interrupt Line or
System Shutdown
From and to Controller, Pull Up Resistor
From Controller
Left floating. PC board traces may be routed
through the pads for this pin.
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Номер в каталоге | Описание | Производители |
LM84CIMQA | Diode Input Digital Temperature Sensor with Two-Wire Interface | National Semiconductor |
LM84CIMQAX | Diode Input Digital Temperature Sensor with Two-Wire Interface | National Semiconductor |
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