Datasheet LM75CIMM-3, LM75CIM-5, LM75CIM-3, LM75B-5.0MDC, LM75CIMM-5 Datasheet (NSC)

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

2

C®interface. The host can query the LM75 at
any time to read temperature. The open-drain Overtempera­ture Shutdown (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

OS

) and the temperature at which the alarm condition goes

away (T

HYST

). In addition, the host can read back the con­tents of the LM75’s T

OS

and T

HYST

registers. Three pins (A0,
A1,A2) are available for address selection. The sensor pow­ers up in Comparator mode with default thresholds of 80˚C
T

OS

and 75˚C T

HYST

.

The LM75’s 3.0V to 5.5V supply voltage range, low supply
current and I

2

C interface make it ideal for a wide range of ap­plications. These include thermal management and protec­tion applications in personal computers, electronic test
equipment, and office electronics.

Features

n SOP-8 and Mini SOP-8 (MSOP) packages save space
n I

2

C Bus interface

n Separate open-drain output pin operates as interrupt or

comparator/thermostat output

n Register readback capability
n Power up defaults permit stand-alone operation as

thermostat

n Shutdown mode to minimize power consumption
n Up to 8 LM75s can be connected to a single bus

Key Specifications

n Supply Voltage 3.0V to 5.5V
n Supply Current operating 250 µA (typ)

1 mA (max)

shutdown 4 µA (typ)

n Temperature Accuracy −25˚C to 100˚C

±

2˚C(max)

−55˚C to 125˚C

±

3˚C(max)

Applications

n System Thermal Management
n Personal Computers
n Office Electronics
n Electronic Test Equipment

Simplified Block Diagram

WATCHDOG™is a trademark of National Semiconductor Corporation.
I2C

®

is a registered trademark of Philips Corporation.

DS012658-1

January 2000

LM75 Digital Temperature Sensor and Thermal WATCHDOG with Two-Wire Interface

© 2000 National Semiconductor Corporation DS012658 www.national.com

Connection Diagram

Ordering Information

Order Number

Package

Marking

NS Package

Number

Supply

Voltage

Transport Media

LM75CIM-3 LM75CIM-3 M08A (SOP-8) 3.3V
LM75CIMX-3 LM75CIM-3 M08A (SOP-8) 3.3V 2500 Units on Tape and Reel
LM75CIMM-3 T01C MUA08A (MSOP-8) 3.3V 250 Units in Rail
LM75CIMMX-3 T01C MUA08A (MSOP-8) 3.3V 3500 Units on Tape and Reel
LM75CIM-5 LM75CIM-5 M08A (SOP-8) 5V
LM75CIMX-5 LM75CIM-5 M08A (SOP-8) 5V 2500 Units on Tape and Reel
LM75CIMM-5 T00C MUA08A (MSOP-8) 5V 250 Units in Rail
LM75CIMMX-5 T00C MUA08A (MSOP-8) 5V 3500 Units on Tape and Reel

Pin Description

Label Pin

#

Function Typical Connection

SDA 1 I

2

C Serial Bi-Directional Data Line. Open Drain. From Controller, tied to a pull-up

SCL 2 I

2

C Clock Input From Controller
O.S. 3 Overtemperature Shutdown Open Drain Output Pull Up Resistor, Controller Interrupt Line
GND 4 Power Supply Ground Ground
+V

S

8 Positive Supply Voltage Input DC Voltage from 3V to 5.5V

A0–A2 7,6,5 User-Set I

2

C Address Inputs Ground (Low, “0”) or +VS(High, “1”)

SOP-8 and Mini SOP-8

DS012658-2

DS012658-3

FIGURE 1. Typical Application

LM75

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Absolute Maximum Ratings (Note 1)

Supply Voltage −0.3V to 6.5V
Voltage at any Pin −0.3V to +V

S

+ 0.3V
Input Current at any Pin (Note 2) 5 mA
Package Input Current (Note 2) 20 mA
O.S. Output Sink Current 10 mA
O.S. Output Voltage 6.5V
Storage Temperature −65˚C to +150˚C
Soldering Information, Lead Temperature
SOP and MSOP Package (Note 3)

Vapor Phase (60 seconds)
Infrared (15 seconds)

215˚C
220˚C

ESD Susceptibility (Note 4)

Human Body Model 950V
Machine Model 100V

Operating Ratings

Specified Temperature Range T

MIN

to T

MAX

(Note 5) −55˚C to +125˚C

Supply Voltage Range (+V

S

) +3.0V to +5.5V

Temperature-to-Digital Converter Characteristics

Unless otherwise noted, these specifications apply for +V

S

=

+5 Vdc for LM75CIM-5 and LM75CIMM-5 and +V

S

=

+3.3 Vdc for

LM75CIM-3 and LM75CIMM-3 (Note 6). Boldface limits apply for T

A

=

T

J

=

T

MIN

to T

MAX

; all other limits T

A

=

T

J

=

+25˚C,

unless otherwise noted.

Parameter Conditions

Typical

(Note 12)

Limits

(Note 7)

Units

(Limit)

Accuracy T

A

=

−25˚C to +100˚C

±

2.0 ˚C (max)

T

A

=

−55˚C to +125˚C

±

3.0

Resolution 9 Bits
Temperature Conversion Time (Note 8) 100 ms
Quiescent Current I

2

C Inactive 0.25 mA

I

2

C Active 1.0 mA (max)

Shutdown Mode, +V

S

=

3V 4 µA

Shutdown Mode, +V

S

=

5V 6 µA

O.S. Output Saturation Voltage I

OUT

=

4.0 mA 0.8 V (max)

(Note 9)

O.S. Delay (Note 10) 1 Conversions (min)

6 Conversions (max)

T

OS

Default Temperature (Note 11) 80 ˚C

T

HYST

Default Temperature (Note 11) 75 ˚C

Logic Electrical Characteristics

DIGITAL DC CHARACTERISTICS

Unless otherwise noted, these specifications apply for +V

S

=

+5 Vdc for LM75CIM-5 and LM75CIMM-5 and +V

S

=

+3.3 Vdc for

LM75CIM-3 and LM75CIMM-3. Boldface limits apply for T

A

=

T

J

=

T

MIN

to T

MAX

; all other limits T

A

=

T

J

=

+25˚C, unless

otherwise noted.

Symbol Parameter Conditions

Typical

(Note 12)

Limits

(Note 7)

Units

(Limit)

V

IN(1)

Logical “1” Input Voltage +VSx 0.7 V (min)

+V

S

+0.5 V (max)

V

IN(0)

Logical “0” Input Voltage −0.3 V (min)

+V

S

x 0.3 V (max)

I

IN(1)

Logical “1” Input Current V

IN

=

5V 0.005 1.0 µA (max)

I

IN(0)

Logical “0” Input Current V

IN

=

0V −0.005 −1.0 µA (max)

C

IN

All Digital Inputs 20 pF

I

OH

High Level Output Current V

OH

=

5V 100 µA (max)

V

OL

Low Level Output Voltage I

OL

=

3mA 0.4 V (max)

t

OF

Output Fall Time C

L

=

400 pF 250 ns (max)

I

O

=

3mA

LM75

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Logic Electrical Characteristics (Continued)

I2C DIGITAL SWITCHING CHARACTERISTICS

Unless otherwise noted, these specifications apply for+V

S

=

+5 Vdc for LM75CIM-5 and LM75CIMM-5 and +V

S

=

+3.3 Vdc for

LM75CIM-3 and LM75CIMM-3 , C

L

(load capacitance) on output lines=80 pF unless otherwise specified. Boldface limits

apply for T

A

=

T

J

=

T

MIN

to T

MAX

; all other limits T

A

=

T

J

=

+25˚C, unless otherwise noted.

The switching characteristics of the LM75 fully meet or exceed the published specifications of the I

2

C bus. The following pa-

rameters are the timing relationships between SCL and SDA signals related to the LM75. They are not the I

2

C bus specifica-

tions.

Symbol Parameter Conditions

Typical

(Note 12)

Limits

(Note 7)

Units

(Limit)

t

1

SCL (Clock) Period 2.5 µs(min)

t

2

Data in Set-Up Time to SCL High 100 ns(min)

t

3

Data Out Stable after SCL Low 0 ns(min)

t

4

SDA Low Set-Up Time to SCL Low (Start Condition) 100 ns(min)

t

5

SDA High Hold Time after SCL High (Stop Condition) 100 ns(min)

Note 1: AbsoluteMaximumRatingsindicate 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: When the input voltage (V

I

) at any pin exceeds the power supplies (V

I

<

GND or V

I

>

+VS) the current at that pin should be limited to 5 mA. The 20 mA

maximum package input current rating limits the number of pins that can safely exceedthe power supplies with an input current of 5 mA to four.
Note 3: SeeAN-450 “Surface Mounting Methods and Their Effect on Product Reliability” or the section titled “Surface Mount” found in a current National Semicon-

ductor Linear Data Book for other methods of soldering surface mount devices.

Note 4: Human body model, 100 pF discharged through a 1.5 kΩ resistor. Machine model, 200 pF discharged directly into each pin.
Note 5: LM75θ

JA

(thermal resistance, junction-to-ambient) when attached to a printed circuit board with 2 oz. foil similar to the one shown in

Figure 3

is summarized

in the table below:

Device Number

NS Package

Number

Thermal

Resistance (θ

JA

)

LM75CIM-3, LM75CIM-5 M08A 200˚C/W

LM75CIMM-3, LM75CIMM-5 MUA08A 250˚C/W

Note 6: Both part numbers of the LM75 will operate properly over the +VSsupply voltage range of 3V to 5.5V.The devices are tested and specified for rated ac-
curacy at their nominal supply voltage. Accuracy will typically degrade 1˚C/V of variation in +V

S

as it varies from the nominal value.

Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 8: Thisspecification is provided only to indicate how often temperature data is updated. The LM75 can be read at any time without regard to conversion state

(and will yield last conversion result). If a conversion is in process it will be interrupted and restarted after the end of the read.
Note 9: Forbest accuracy, minimize output loading. Higher sink currents can affect sensor accuracy with internal heating. This can cause an error of 0.64˚C at full

rated sink current and saturation voltage based on junction-to-ambient thermal resistance.

Note 10: O.S. Delay is user programmable up to 6 “over limit” conversions before O.S. is set to minimize false tripping in noisy environments.
Note 11: Default values set at power up.
Note 12: Typicals are at T

A

=

25˚C and represent most likely parametric norm.

DS012658-4

LM75

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Logic Electrical Characteristics (Continued)

DS012658-5

FIGURE 2. Temperature-to-Digital Transfer Function (Non-linear scale for clarity)

DS012658-6

FIGURE 3. Printed Circuit Board Used for Thermal Resistance Specifications

LM75

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Typical Performance Characteristics

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 is available at all times via the I

2

C bus. If a conver­sion is in progress, it will be stopped and restarted after the
read.A digital comparator is also incorporated that compares
a series of readings, the number of which is user-selectable,
to user-programmable setpoint and hysteresis values. The
comparator trips the O.S. output line, which is programmable
for mode and polarity.

1.1 O.S. OUTPUT, T

OS

AND T

HYST

LIMITS

In Comparator mode the O.S. Output behaves like a thermo­stat. The output becomes active when temperature exceeds
the T

OS

limit, and leaves the active state when the tempera-

ture drops below the T

HYST

limit. In this mode the O.S. out­put can be used to turn a cooling fan on, initiate an emer­gency system shutdown, or reduce system clock speed.
Shutdown mode does not reset O.S. state in a comparator
mode.

In Interrupt mode exceeding T

OS

also makes O.S. active but
O.S. will remain active indefinitely until reset by reading any
register via the I

2

C interface. Once O.S. has been activated

by crossing T

OS

, then reset, it can be activated again only by

Temperature going below T

HYST

. Again, it will remain active
indefinitely until being reset by a read. Placing the LM75 in
shutdown mode also resets the O.S. Output.

1.2 POWER UP AND POWER DOWN

The LM75 always powers up in a known state. The power up
default conditions are:

1. Comparator mode

2. T

OS

=

80˚C

3. T

HYST

=

75˚C

4. O.S. active low

5. Pointer=“00”
If the LM75 is not connected to the I

2

C bus on power up, it
will act as a stand-alone thermostat with the above tempera­ture settings.

When the supply voltage is less than about 1.7V, the LM75 is
considered powered down. As the supply voltage rises
above the nominal 1.7V power up threshold, the internal reg­isters are reset to the power up default values listed above.

1.3 I

2

C BUS INTERFACE

The LM75 operates as a slave on the I

2

C bus, so the SCL
line is an input (no clock is generated by the LM75) and the
SDA line is a bi-directional serial data path. According to I

2

C
bus specifications, the LM75 has a 7-bit slave address. The
four most significant bits of the slave address are hard wired
inside the LM75 and are “1001”. The three least significant
bits of the address are assigned to pins A2–A0, and are set
by connecting these pins to ground for a low, (0); or to +V

S

for a high, (1).
Therefore, the complete slave address is:

1001A2A1A0

MSB LSB

Static Quiescent Current vs
Temperature

DS012658-16

Dynamic Quiescent Current vs
Temperature

DS012658-17

Accuracy vs Temperature

DS012658-18

LM75

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1.0 Functional Description (Continued)

DS012658-7

Note 13: Theseinterrupt mode resets of O.S. occur only when LM75 is read or placed in shutdown. Otherwise, O.S. would remain active indefinitely for any event.

FIGURE 4. O.S. Output Temperature Response Diagram

LM75

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1.0 Functional Description (Continued)

1.4 TEMPERATURE DATA FORMAT

Temperature data can be read from the Temperature, T

OS

Set Point, and T

HYST

Set Point registers; and written to the

T

OS

Set Point, and T

HYST

Set Point registers. Temperature
data is represented by a 9-bit, two’s complement word with
an LSB (Least Significant Bit) equal to 0.5˚C:

Temperature Digital Output

Binary Hex

+125˚C 0 1111 1010 0FAh

+25˚C 0 0011 0010 032h

+0.5˚C 0 0000 0001 001h

0˚C 0 0000 0000 000h

−0.5˚C 1 1111 1111 1FFh

−25˚C 1 1100 1110 1CEh

−55˚C 1 1001 0010 192h

1.5 SHUTDOWN MODE

Shutdown mode is enabled by setting the shutdown bit in the
Configuration register via the I

2

C bus. Shutdown mode re­duces power supply current to 1 µA typical. In Interrupt mode
O.S. is reset if previously set and is undefined in Comparator
mode during shutdown. The I

2

C interface remains active. Ac-

tivity on the clock and data lines of the I

2

C bus may slightly

increase shutdown mode quiescent current. T

OS,THYST

, and
Configuration registers can be read from and written to in
shutdown mode.

1.6 FAULT QUEUE

A fault queue of up to 6 faults is provided to prevent false
tripping of O.S. when the LM75 is used in noisy environ­ments. The number of faults set in the queue must occur
consecutively to set the O.S. output.

1.7 COMPARATOR/INTERRUPT MODE

As indicated in the O.S. Output Temperature Response Dia­gram,

Figure 4

, the events that trigger O.S. are identical for
either Comparator or Interrupt mode. The most important dif­ference is that in Interrupt mode the O.S. will remain set in­definitely once it has been set. To reset O.S. while in Inter­rupt mode, perform a read from any register in the LM75.

1.8 O.S. OUTPUT

The O.S. output is an open-drain output and does not have
an internal pull-up. A “high” level will not be observed on this
pin until pull-up current is provided from some external
source, typically a pull-up resistor. Choice of resistor value
depends on many system factors but, in general, the pull-up
resistor should be as large as possible. This will minimize
any errors due to internal heating of the LM75. The maxi­mum resistance of the pull up, based on LM75 specification
for High Level Output Current, to provide a 2V high level, is
30 kΩ.

1.9 O.S. POLARITY

The O.S. output can be programmed via the configuration
register to be either active low (default mode), or active high.
In active low mode the O.S. output goes low when triggered
exactly as shown on the O.S. Output TemperatureResponse
Diagram,

Figure 4

. Active high simply inverts the polarity of

the O.S. output.

LM75

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1.0 Functional Description (Continued)

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 last location it was set to. In Interrupt
Mode, a read from the LM75, or placing the device in shut­down mode, resets the O.S. output. All registers are read
and write, except the Temperature register which is read
only.

A write to the LM75 will always include the address byte and
the Pointer byte. A write to the Configuration register re­quires one data byte, and the T

OS

and T

HYST

registers re-

quire two data bytes.
Reading the LM75 can take place either of two ways: If the

location latched in the Pointer is correct (most of the time it is
expected that the Pointer will point to the Temperature regis­ter because it will be the data most frequently read from the
LM75), then the read can simply consist of an address byte,
followed by retrieving the corresponding number of data
bytes. If the Pointer needs to be set, then an address byte,
pointer byte, repeat start, and another address byte will ac­complish a read.

The first data byte is the most significant byte with most sig­nificant bit first, permitting only as much data as necessary to
be read to determine temperature condition. For instance, if
the first four bits of the temperature data indicates an over­temperature condition, the host processor could immediately
take action to remedy the excessive temperatures. At the
end of a read, the LM75 can accept either Acknowledge or
No Acknowledge from the Master (No Acknowledge is typi­cally used as a signal for the slave that the Master has read
its last byte).

An inadvertent 8-bit read from a 16-bit register, with the D7
bit low, can cause the LM75 to stop in a state where the SDA
line is held low as shown in

Figure 5

. This can prevent any
further bus communication until at least 9 additional clock
cycles have occurred. Alternatively, the master can issue
clock cycles until SDA goes high, at which time issuing a
“Stop” condition will reset the LM75.

DS012658-8

DS012658-9

FIGURE 5. Inadvertent 8-Bit Read from 16-Bit Register where D7 is Zero (“0”)

LM75

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1.0 Functional Description (Continued)

1.11 POINTER REGISTER

(Selects which registers will be read from or written to):

P7 P6 P5 P4 P3 P2 P1 P0

000000Register

Select

P0-P1: Register Select:

P1 P0 Register

0 0 Temperature (Read only) (Power-up default)
0 1 Configuration (Read/Write)
10T

HYST

(Read/Write)

11T

OS

(Read/Write)

P2–P7: Must be kept zero.

1.12 TEMPERATURE REGISTER

(Read Only):

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

MSBBit7Bit6Bit5Bit4Bit3Bit2Bit1LSBXXXXXXX
D0–D6: Undefined
D7–D15: Temperature Data. One LSB=0.5˚C. Two’s complement format.

1.13 CONFIGURATION REGISTER

(Read/Write):

D7 D6 D5 D4 D3 D2 D1 D0

0 0 0 Fault Queue O.S. Cmp/Int Shutdown

Polarity
Power up default is with all bits “0” (zero).
D0: Shutdown: When set to 1 the LM75 goes to low power shutdown mode.
D1: Comparator/Interrupt mode: 0 is Comparator mode, 1 is Interrupt mode.
D2: O.S. Polarity: 0 is active low, 1 is active high. O.S. is an open-drain output under all conditions.
D3–D4: Fault Queue: Number of faults necessary to detect before setting O.S. output to avoid false tripping due to noise. Faults

are determind at the end of a conversion. Conversions take about 100 ms, typically, to complete.

D4 D3 Number of Faults

0 0 1 (Power-up default)
012
104
116

D5–D7: These bits are used for production testing and must be kept zero for normal operation.

1.14 T

HYST

AND TOSREGISTER

(Read/Write):

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

MSBBit7Bit6Bit5Bit4Bit3Bit2Bit1LSBXXXXXXX
D0–D6: Undefined
D7–D15: T

HYST

Or TOSTrip Temperature Data. Power up default is T

OS

=

80˚C, T

HYST

=

75˚C.

LM75

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2.0 I2C Timing Diagrams

DS012658-10

FIGURE 6. Timing Diagram

LM75

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2.0 I2C Timing Diagrams (Continued)

DS012658-11

FIGURE 7. Timing Diagrams (Continued)

LM75

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3.0 Application Hints

To get the expected results when measuring temperature
with an integrated circuit temperature sensor like the LM75,
it is important to understand that the sensor measures its
own die temperature. For the LM75, the best thermal path
between the die and the outside world is through the LM75’s
pins. In the MSOP-8 package, the GND pin is directly con­nected to the die, so the GND pin provides the best thermal
path. If the other pins are at different temperatures (unlikely,
but possible), they will affect the die temperature, but not as
strongly as the GND pin. In the SO-8 package, none of the
pins is directly connected to the die, so they will all contribute
similarly to the die temperature. Because the pins represent
a good thermal path to the LM75 die, the LM75 will provide
an accurate measurement of the temperature of the printed

circuit board on which it is mounted. There is a less efficient
thermal path between the plastic package and the LM75 die.
If the ambient air temperature is significantly different from
the printed circuit board temperature, it will have a small ef­fect on the measured temperature.

In probe-type applications, the LM75 can be mounted inside
a sealed-end metal tube, and can then be dipped into a bath
or screwed into a threaded hole in a tank. As with any IC, the
LM75 and accompanying wiring and circuits must be kept in­sulated and dry, to avoid leakage and corrosion. This is es­pecially true if the circuit may operate at cold temperatures
where condensation can occur. Printed-circuit coatings and
varnishes such as Humiseal and epoxy paints or dips are of­ten used to insure that moisture cannot corrode the LM75 or
its connections.

4.0 Typical Applications

DS012658-12

When using the two-wire interface: program O.S. for active high and connect O.S. directly to Q2’s gate.

FIGURE 8. Simple Fan Controller, Interface Optional

DS012658-13

FIGURE 9. Data Acquisition System with Temperature Input via I2C Bus

LM75

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4.0 Typical Applications (Continued)

DS012658-14

FIGURE 10. Simple Thermostat, Interface Optional

DS012658-15

FIGURE 11. Temperature Sensor with Loudmouth Alarm (Barking Watchdog)

LM75

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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 or LM75CIMX-5

NS Package Number M08A

LM75

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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

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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
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.

2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.

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Corporation

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8-Lead Molded Mini Small Outline Package (MSOP)

(JEDEC REGISTRATION NUMBER M0-187)

Order Number LM75CIMM-3, LM75CIMMX-3,

LM75CIMM-5 or LM75CIMMX-5

NS Package Number MUA08A

LM75 Digital Temperature Sensor and Thermal WATCHDOG with Two-Wire Interface

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.