LM83CIMQA/NOPB National Semiconductor, LM83CIMQA/NOPB Datasheet

IC TEMP SENSOR DIGITAL 16-SSOP

LM83CIMQA/NOPB

Manufacturer Part Number
LM83CIMQA/NOPB
Description
IC TEMP SENSOR DIGITAL 16-SSOP
Manufacturer
National Semiconductor
Type
Sensorsr
Datasheet

Specifications of LM83CIMQA/NOPB

Function
Hardware Monitor
Topology
ADC (Sigma Delta), Comparator, Register Bank
Sensor Type
External & Internal
Sensing Temperature
-40°C ~ 125°C, External Sensor
Output Type
I²C™/SMBus™
Output Alarm
Yes
Output Fan
No
Voltage - Supply
3 V ~ 3.6 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
16-SSOP
Ic Output Type
Digital
Sensing Accuracy Range
± 1°C
Temperature Sensing Range
-40°C To +125°C
Supply Current
800µA
Supply Voltage Range
3V To 3.6V
Resolution (bits)
8bit
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
*LM83CIMQA
*LM83CIMQA/NOPB
LM83CIMQA

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© 2000 National Semiconductor Corporation
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 tem-
perature of three external devices, such as Pentium II
cessors or diode connected 2N3904s. The temperature of
any ASIC can be detected using the LM83 as long as a dedi-
cated 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 oc-
curs 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 pro-
grammable 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 Ana-
log Devices ADM1021.
Features
n Accurately senses die temperature of 3 remote ICs, or
Simplified Block Diagram
SMBus
Pentium II
I 2 C
diode junctions
®
is a registered trademark of the Philips Corporation.
is a trademark of the Intel Corporation.
®
is a registered trademark of the Intel Corporation.
DS101058
®
Pro-
n On-board local temperature sensing
n SMBus and I
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
Key Specifications
Applications
n System Thermal Management
n Computers
n Electronic Test Equipment
n Office Electronics
n HVAC
j
j
j
j
error)
SMBus 1.1 TIMEOUT
single bus
Supply Voltage
Supply Current
Local Temp Accuracy (includes quantization error)
Remote Diode Temp Accuracy (includes quantization
2
C compatible interface, supports
+25˚C to +100˚C
0˚C to +125˚C
0˚C to +85˚C
DS101058-1
November 1999
±
0.8mA (max)
www.national.com
3.0V to 3.6V
3.0˚C (max)
±
±
3˚C (max)
4˚C (max)

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LM83CIMQA/NOPB Summary of contents

Page 1

... Pentium II ® registered trademark of the Intel Corporation ® registered trademark of the Philips Corporation. © 2000 National Semiconductor Corporation n On-board local temperature sensing n SMBus and I 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 ® ...

Page 2

Connection Diagram QSOP-16 TOP VIEW Typical Application Pin Description Label Pin # D1+, D2+, D3 www.national.com Ordering Information Order Number LM83CIMQA LM83CIMQAX DS101058-2 Function Diode Current Source To Diode Anode. Connected to remote discrete ...

Page 3

Pin Description (Continued) Label Pin # D− 4 ADD0–ADD1 10, 6 GND 13, 15 INT 11 SMBData 12 SMBCLK 14 T_CRIT_A 16 Function Diode Return Current To all Diode Junction Cathodes using a star Sink connection ...

Page 4

Absolute Maximum Ratings Supply Voltage Voltage at Any Pin D− Input Current Input Current at All Other Pins (Note 2) Package Input Current (Note 2) SMBData, T_CRIT_A, INT Output Sink Current SMBCLK, SMBData, T_CRIT_A, INT Output Voltage Storage Temperature Soldering ...

Page 5

Logic Electrical Characteristics DIGITAL DC CHARACTERISTICS Unless otherwise noted, these specifications apply for all other limits =+25˚C, unless otherwise noted. MAX A J Symbol Parameter SMBData, SMBCLK V Logical “1” Input Voltage IN(1) V ...

Page 6

Logic Electrical Characteristics SMBus DIGITAL SWITCHING CHARACTERISTICS Unless otherwise noted, these specifications apply for V pF. Boldface limits apply for The switching characteristics of the LM83 fully meet or exceed the published specifications of the SMBus ...

Page 7

Logic Electrical Characteristics See drawing DS10105807 Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating the device beyond its rated operating conditions. Note 2: ...

Page 8

Logic Electrical Characteristics Note 6: Typicals are 25˚C and represent most likely parametric norm. A Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level). Note 8: The Temperature Error will vary less than Note ...

Page 9

Functional Description Register flags are updated at the completion of a conversion, which occurs approximately 60 ms after a temperature diode is sampled. INT is deactivated when the Status Register, containing the set bit, is read and a temperature ...

Page 10

Functional Description 3. Diode 1, Diode 2, and Diode 3 Remote Temperature set to 0˚C until the LM83 senses a diode present between the D+ and D− input pins. 4. Status Registers 1 and 2 set to 00h. 5. ...

Page 11

Functional Description 1.9 COMMUNICATING with the LM83 There are 19 data registers in the LM83, selected by the Command Register. At power-up the Command Register is set to “00”, the location for the Read Local Temperature Reg- ister. The ...

Page 12

Functional Description the serial interface logic if either of the SMBData or SMBCLK lines are held low between 25 ms and 40 ms. TIMEOUT al- lows a clean recovery in cases where the master may be re- set while ...

Page 13

Functional Description 2.0 LM83 REGISTERS 2.1 COMMAND REGISTER Selects which registers will be read from or written to. Data for this register should be transmitted during the Command Byte of the SMBus write communication ...

Page 14

Functional Description Command Se- Power On Default State lect Address < > < > P7:P0 hex D7:D0 binary 5Ch-6Fh and F0h-FDh FEh 0000 0001 FFh 2.2 LOCAL and D1, D2 and D3 REMOTE TEMPERATURE REGISTERS (LT, D1RT, D2RT, and ...

Page 15

Functional Description D5: T_CRIT mask for Diode 1, when set Diode 1 temperature reading that exceeds T_CRIT setpoint will not activate the T_CRIT_A pin. D4: T_CRIT mask for Diode 2, when set Diode ...

Page 16

SMBus Timing Diagrams (a) Serial Bus Write to the internal Command Register followed by a the Data Byte (b) Serial Bus Write to the internal Command Register (c) Serial Bus Read from a Register with the internal Command Register ...

Page 17

Application Hints The LM83 can be applied easily in the same way as other integrated-circuit temperature sensors, and its remote diode sensing capability allows used in new ways as well. It can be soldered to a ...

Page 18

Application Hints 6. Avoid running diode traces close to or parallel to high speed digital and bus lines. Diode traces should be kept at least 2cm. apart from the high speed digital traces necessary to ...

Page 19

Typical Applications Any two or three D+ inputs can be connected in parallel to increase the number of High temperature setpoints for a particular temperature reading. If all three D+ inputs are tied as shown here, D1+, D2+ and ...

Page 20

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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