Rainbow-electronics LM84 Manual do Utilizador Página 1

Consulte online ou descarregue Manual do Utilizador para Sensores Rainbow-electronics LM84. Rainbow Electronics LM84 User Manual Manual do Utilizador

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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
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
j
Supply Voltage 3.0V - 3.6V
j
Supply Current 1 mA (max)
j
Local Temperature Accuracy
±
1.0˚C (typ)
j
Remote Diode Temperature Accuracy
+60˚C to +100˚C
±
3˚C (max)
0˚C to +125˚C
±
5˚C (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.
Pentium
®
II processor is a registered trademark of the Intel Corporation.
I
2
C
®
is a registered trademark of the Philips Corporation.
DS100961-1
#
Indicates Active Low (”NOT“)
July 2000
LM84 Diode Input Digital Temperature Sensor with Two-Wire Interface
© 2001 National Semiconductor Corporation DS100961 www.national.com
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Resumo do Conteúdo

Página 1 - Interface

LM84Diode Input Digital Temperature Sensor with Two-WireInterfaceGeneral DescriptionThe LM84 is a remote diode temperature sensor,Delta-Sigma analog-t

Página 2 - Connection Diagram

1.0 Functional Description (Continued)1.3 SMBus INTERFACEThe LM84 operates as a slave on the SMBus, so theSMBCLK line is an input (no clock is generat

Página 3 - Pin Descriptions

1.0 Functional Description (Continued)1.7 COMMUNICATING with the LM84There are 10 data registers in the LM84, selected by theCommand Register. At powe

Página 4 - Operating Ratings

1.0 Functional Description (Continued)1.8 LM84 REGISTERS1.8.1 COMMAND REGISTERSelects which registers will be read from or written to. Data for this r

Página 5

1.0 Functional Description (Continued)1.8.6 LOCAL AND REMOTE T_CRIT REGISTERS(Read/Write):D7 D6 D5 D4 D3 D2 D1 D0MSB Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit

Página 6 - DS100961-4

3.0 Application HintsThe LM84 can be applied easily in the same way as otherintegrated-circuit temperature sensors, and its remote diodesensing capabi

Página 7 - SMBus TIMEOUT

3.0 Application Hints (Continued)7. The ideal place to connect the LM84’s GND pin is asclose as possible to the Processors GND associatedwith the sens

Página 8 - DS100961-8

Physical Dimensions inches (millimeters) unless otherwise notedLIFE SUPPORT POLICYNATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENT

Página 9 - Section 1.8.3

Connection DiagramOrdering InformationOrderNumberNSPackageNumberTransportMediaSMBusRevisionLevelNoise Filteron SMBCLKLM84BIMQAMQA16A(QSOP-16)95 Units

Página 10

Pin DescriptionsLabel Pin#Function Typical ConnectionNC1, 5, 9,13, 16Manufacturing test pins. Left floating. PC board traces may be routedthrough the

Página 11 - DS100961-9

Absolute Maximum Ratings (Note 1)Supply Voltage −0.3V to 6.0VVoltage at Any Pin:NC (Pins 1,5,9), ADD0, ADD1, D+−0.3V to(VCC+ 0.3V)All other pins (exce

Página 12

Logic Electrical CharacteristicsDIGITAL DC CHARACTERISTICSUnless otherwise noted, these specifications apply for VCC=+3.0 to 3.6 Vdc. Boldface limits

Página 13 - 2.0 SMBus Timing Diagrams

Logic Electrical Characteristics (Continued)SMBus DIGITAL SWITCHING CHARACTERISTICSUnless otherwise noted, these specifications apply for VCC=+3.0 Vdc

Página 14 - Figure 6

Logic Electrical Characteristics (Continued)SMBus TIMEOUTDS100961-13LM84www.national.com7

Página 15 - 4.0 Typical Applications

Logic Electrical Characteristics (Continued)Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC el

Página 16 - NS Package Number MQA16

Logic Electrical Characteristics (Continued)1.0 Functional DescriptionThe LM84 temperature sensor incorporates a band-gap typetemperature sensor using

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