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Details, datasheet, quote on part number:LM83CIMQAX
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| Part: | LM83CIMQAX |
| Category: | Sensors => Temperature Sensors |
| Description: | Triple-diode Input And Local Digital Temperature Sensor With Two-wire Interface |
| Company: | National Semiconductor Corporation |
| Datasheet: | Download LM83CIMQAX datasheet File size : 340 kB |
| Request For quote: | Find where to buy LM83CIMQAX
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Datasheet text preview:
LM83 Triple-Diode Input and Local Digital Temperature Sensor with Two-Wire Interface
November 1999
LM83 Triple-Diode Input and Local Digital Temperature Sensor with Two-Wire Interface
General Description
The LM83 is a digital temperature sensor with a 2 wire serial interface that senses the voltage and thus the temperature of three remote diodes using a Delta-Sigma analog-to-digital converter with a digital over-temperature detector. The LM83 accurately senses its own temperature as well as the temperature of three external devices, such as Pentium II ® Processors or diode connected 2N3904s. The temperature of any ASIC can be detected using the LM83 as long as a dedicated diode (semiconductor junction) is available on the die. Using the SMBus interface a host can access the LM83's registers at any time. Activation of a T_CRIT_A output occurs when any temperature is greater than a programmable comparator limit, T_CRIT. Activation of an INT output occurs when any temperature is greater than its corresponding programmable comparator HIGH limit. The host can program as well as read back the state of the T_CRIT register and the four T_HIGH registers. Three state logic inputs allow two pins (ADD0, ADD1) to select up to 9 SMBus address locations for the LM83. The sensor powers up with default thresholds of 127°C for T_CRIT and all T_HIGHs. The LM83 is pin for pin and register compatible with the LM84 as well as the Maxim MAX1617 and the Analog Devices ADM1021. n On-board local temperature sensing n SMBus and I2C compatible interface, supports SMBus 1.1 TIMEOUT n Two interrupt outputs: INT and T_CRIT_A n Register readback capability n 7 bit plus sign temperature data format, 1 °C resolution n 2 address select pins allow connection of 9 LM83s on a single bus
Key Specifications
n Supply Voltage n Supply Current 0°C to +85°C 3.0V to 3.6V 0.8mA (max)
n Local Temp Accuracy (includes quantization error)
± 3.0°C (max)
n Remote Diode Temp Accuracy (includes quantization error) +25°C to +100°C 0°C to +125°C
± 3°C (max) ± 4°C (max)
Applications
n n n n n System Thermal Management Computers Electronic Test Equipment Office Electronics HVAC
Features
n Accurately senses die temperature of 3 remote ICs, or diode junctions
Simplified Block Diagram
DS101058-1
SMBusTM 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
DS101058
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LM83
Connection Diagram
QSOP-16
Ordering Information
Order Number LM83CIMQA NS Package Number MQA16A (QSOP-16) MQA16A (QSOP-16) Transport Media 95 Units in Rail 2500 Units on Tape and Reel
LM83CIMQAX
DS101058-2
TOP VIEW
Typical Application
DS101058-3
Pin Description
Label Pin # Function Diode Current Source D1+, D2+, D3+ 1, 3, 5 Typical Connection To Diode Anode. Connected to remote discrete diode junction or to the diode junction on a remote IC whose die temperature is being sensed. When not used they should be left floating. DC Voltage from 3.0 V to 3.6 V
VCC
2
Positive Supply Voltage Input
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2
LM83
Pin Description
Label D- ADD0 ADD1 GND
(Continued) Pin # 4 10, 6 7, 8 Function Diode Return Current Sink User-Set SMBus (I2C) Address Inputs Power Supply Ground Manufacturing test pins. Typical Connection To all Diode Junction Cathodes using a star connection to pin. Must float when not used. Ground (Low, "0"), VCC (High, "1") or open ("TRI-LEVEL") Ground 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 LM83 so that the Absolute Maximum Rating, Voltage at Any Pin, is not violated. Pull Up Resistor, Controller Interrupt or Alert Line From and to Controller, Pull-Up Resistor
NC
9, 13, 15
INT
11
Interrupt Output, open-drain SMBus (I2C) Serial Bi-Directional Data Line, open-drain output SMBus (I2C) Clock Input Critical Temperature Alarm, open-drain output
SMBData SMBCLK T_CRIT_A
12 14 16
From Controller, Pull-Up Resistor Pull Up Resistor, Controller Interrupt Line or System Shutdown
3
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