LM75CIMX-3 National Semiconductor, LM75CIMX-3 Datasheet

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LM75CIMX-3

Manufacturer Part Number
LM75CIMX-3
Description
IC,TEMPERATURE SENSOR,SOP,8PIN,PLASTIC
Manufacturer
National Semiconductor
Datasheet

Specifications of LM75CIMX-3

Rohs Compliant
NO

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© 2005 National Semiconductor Corporation
LM75
Digital Temperature Sensor and Thermal Watchdog with
Two-Wire Interface
General Description
The LM75 is a temperature sensor, Delta-Sigma analog-to-
digital converter, and digital over-temperature detector with
I
read temperature. The open-drain Overtemperature Shut-
down (O.S.) output becomes active when the temperature
exceeds a programmable limit. This pin can operate in either
“Comparator” or “Interrupt” mode.
The host can program both the temperature alarm threshold
(T
away (T
tents of the LM75’s T
A1, A2) are available for address selection. The sensor
powers up in Comparator mode with default thresholds of
80˚C T
The LM75’s 3.0V to 5.5V supply voltage range, low supply
current and I
applications. These include thermal management and pro-
tection applications in personal computers, electronic test
equipment, and office electronics.
Features
n SOP-8 and Mini SOP-8 (MSOP) packages save space
n I
n Separate open-drain output pin operates as interrupt or
Simplified Block Diagram
2
I 2 C
C
OS
comparator/thermostat output
®
2
®
C Bus interface
is a registered trademark of Philips Corporation.
) and the temperature at which the alarm condition goes
interface. The host can query the LM75 at any time to
OS
HYST
and 75˚C T
). In addition, the host can read back the con-
2
C interface make it ideal for a wide range of
OS
HYST
and T
.
HYST
registers. Three pins (A0,
DS012658
n Register readback capability
n Power up defaults permit stand-alone operation as
n Shutdown mode to minimize power consumption
n Up to 8 LM75s can be connected to a single bus
n UL Recognized Component
Key Specifications
Applications
n System Thermal Management
n Personal Computers
n Office Electronics
n Electronic Test Equipment
j
j
j
thermostat
Supply Voltage
Supply Current
Temperature Accuracy
operating
shutdown
−25˚C to 100˚C
−55˚C to 125˚C
01265801
October 2005
www.national.com
3.0V to 5.5V
250 µA (typ)
1 mA (max)
±
±
4 µA (typ)
2˚C(max)
3˚C(max)

Related parts for LM75CIMX-3

LM75CIMX-3 Summary of contents

Page 1

... Separate open-drain output pin operates as interrupt or comparator/thermostat output Simplified Block Diagram ® registered trademark of Philips Corporation. © 2005 National Semiconductor Corporation n Register readback capability n Power up defaults permit stand-alone operation as thermostat n Shutdown mode to minimize power consumption LM75s can be connected to a single bus ...

Page 2

... Package Order Number Marking LM75BIM-3 LM75BIM-3 LM75BIMX-3 LM75BIM-3 LM75BIMM-3 T01B LM75BIMMX-3 T01B LM75BIM-5 LM75BIM-5 LM75BIMX-5 LM75BIM-5 LM75BIMM-5 T00B LM75BIMMX-5 T00B LM75CIM-3 LM75CIM-3 LM75CIMX-3 LM75CIM-3 LM75CIMM-3 T01C LM75CIMMX-3 T01C LM75CIM-5 LM75CIM-5 LM75CIMX-5 LM75CIM-5 LM75CIMM-5 T00C LM75CIMMX-5 T00C Pin Descriptions Label Pin # 2 SDA Serial Bi-Directional Data Line ...

Page 3

Typical Application FIGURE 1. Typical Application 3 01265803 www.national.com ...

Page 4

Absolute Maximum Ratings Supply Voltage Voltage at any Pin Input Current at any Pin (Note 2) Package Input Current (Note 2) O.S. Output Sink Current O.S. Output Voltage Storage Temperature Soldering Information, Lead Temperature SOP and MSOP Package (Note 3) ...

Page 5

Logic Electrical Characteristics DIGITAL DC CHARACTERISTICS Unless otherwise noted, these specifications apply for +V LM75BIMM-5, LM75CIM-5, and LM75CIMM-5 and +V LM75CIMM-3 (Note 6). Boldface limits apply for T noted. Symbol Parameter t Output Fall Time DIGITAL ...

Page 6

Note 8: The conversion-time specification is provided to indicate how often the temperature data is updated. The LM75 can be accessed at any time and reading the Temperature Register will yield result from the last temperature conversion. When the LM75 ...

Page 7

Typical Performance Characteristics Static Quiescent Current vs Temperature Accuracy vs Temperature 1.0 Functional Description The LM75 temperature sensor incorporates a band-gap type temperature sensor and 9-bit ADC (Delta-Sigma Analog-to- Digital Converter). The temperature data output of the LM75 2 is ...

Page 8

Functional Description above the nominal 1.7V power up threshold, the internal registers are reset to the power up default values listed above BUS INTERFACE The LM75 operates as a slave on the I line is ...

Page 9

Functional Description 1.4 TEMPERATURE DATA FORMAT Temperature data can be read from the Temperature, T Set Point, and T Set Point registers; and written to the HYST T Set Point, and T Set Point registers. Temperature OS HYST data ...

Page 10

Functional Description 1.10 INTERNAL REGISTER STRUCTURE There are four data registers in the LM75, selected by the Pointer register. At power-up the Pointer is set to “00”; the location for the Temperature Register. The Pointer register latches whatever the ...

Page 11

Functional Description 1.11 POINTER REGISTER (Selects which registers will be read from or written to P0-P1: Register Select P2–P7: Must be kept zero. 1.12 TEMPERATURE REGISTER (Read Only): D15 D14 D13 D12 ...

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www.national.com 12 ...

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13 www.national.com ...

Page 14

Application Hints To get the expected results when measuring temperature with an integrated circuit temperature sensor like the LM75 important to understand that the sensor measures its own die temperature. For the LM75, the best thermal path ...

Page 15

Typical Applications FIGURE 9. Data Acquisition System with Temperature Input via I FIGURE 10. Simple Thermostat, Interface Optional (Continued) 01265814 15 01265813 2 C Bus www.national.com ...

Page 16

Typical Applications FIGURE 11. Temperature Sensor with Loudmouth Alarm (Barking Watchdog) www.national.com (Continued) 16 01265815 ...

Page 17

... Physical Dimensions inches (millimeters) unless otherwise noted 8-Lead (0.150" Wide) Molded Small Outline Package (SOP), JEDEC Order Number LM75CIM-3, LM75CIMX-3, LM75CIM-5, LM75CIMX-5, LM75BIM-3, LM75BIMX-3, LM75BIM-5, or LM75BIMX-5 NS Package Number M08A 17 www.national.com ...

Page 18

... BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...

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