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Part: LM84CIMQAX
Category:
Sensors
-> Temperature Sensors
Description: LM84 - Diode Input Digital Temperature Sensor With Two-wire Interface, Package: Ssop, Pin Nb=16
Company: National Semiconductor Corporation
Datasheet: Download LM84CIMQAX datasheet File size : 135 kB
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Datasheet text preview:
LM84 Diode Input Digital Temperature Sensor with Two-Wire Interface
July 2000
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 SMBusTM interface. The LM84 senses its own temperature as well as the temperature 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. 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
3.0V - 3.6V 1 mA (max)
± 1.0°C (typ) ± 3°C (max) ± 5°C (max)
+60°C to +100°C 0°C to +125°C
Applications
n n n n n System Thermal Management Personal Computers Electronic Test Equipment Office Electronics HVAC
Features
n Directly senses die temperature of remote ICs n Senses temperature of remote diodes n SMBus compatible interface, supports SMBus Timeout
Simplified Block Diagram
DS100961-1
# Indicates Active Low ("NOT")
SMBusTM is a trademark of the Intel Corporation. Pentium ® II processor is a registered trademark of the Intel Corporation. I2C ® is a registered trademark of the Philips Corporation.
© 2001 National Semiconductor Corporation
DS100961
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LM84
Connection Diagram
QSOP-16
DS100961-2
TOP VIEW
Ordering Information
Order Number LM84BIMQA NS Package Number MQA16A (QSOP-16) MQA16A (QSOP-16) MQA16A (QSOP-16) MQA16A (QSOP-16) Transport Media 95 Units in Rail 2500 Units on Tape and Reel 95 Units in Rail 2500 Units on Tape and Reel SMBus Revision Level 1.1 1.1 Noise Filter on SMBCLK 20MHz 20MHz
LM84BIMQAX
LM84CIMQA
1.0 1.0
Not Available Not Available
LM84CIMQAX
Typical Application
DS100961-3
www.national.com
2
LM84
Pin Descriptions
Label Pin # Function Manufacturing test pins. NC 1, 5, 9, 13, 16 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
VCC D+
2
Positive Supply Voltage Input Diode Current Source
3 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
D- ADD0 ADD1 GND T_CRIT_A
4 10, 6 7, 8 11
SMBData SMBCLK NC
12 14 15
From Controller Left floating. PC board traces may be routed through the pads for this pin.
3
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