LM75BIM-3 [TI]
LM75C Digital Temperature Sensor and Thermal Watchdog with Two-Wire Interface; LM75C数字温度传感器和热看门狗具有双线接口
| 型号： | LM75BIM-3 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | LM75C Digital Temperature Sensor and Thermal Watchdog with Two-Wire Interface |
| 文件： | 总23页 (文件大小：1146K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LM75B, LM75C
www.ti.com
SNIS153B –JULY 2009–REVISED MARCH 2013
LM75B
LM75C Digital Temperature Sensor and Thermal Watchdog with Two-Wire Interface
Check for Samples: LM75B, LM75C
1
FEATURES
DESCRIPTION
The LM75B and LM75C are industy-standard digital
temperature sensors with an integrated Sigma-Delta
analog-to-digital converter and I2C interface. The
LM75 provides 9-bit digital temperature readings with
an accuracy of ±2°C from -25°C to 100°C and ±3°C
over -55°C to 125°C.
2
•
No External Components Required
•
•
•
•
Shutdown Mode to Minimize Power
Consumption
Up to Eight LM75s Can be Connected to a
Single Bus
Power Up Defaults Permit Stand-alone
Operation as Thermostat
Communication is accomplished over
a 2-wire
interface which operates up to 400kHz. The LM75
has three address pins, allowing up to eight LM75
devices to operate on the same 2-wire bus. The
LM75 has a dedicated over-temperature output (O.S.)
with programmable limit and hystersis. This output
has programmable fault tolerance, which allows the
user to define the number of consecutive error
conditions that must occur before O.S. is activated.
The wide temperature and supply range and I2C
interface make the LM75 ideal for a number of
applications including base stations, electronic test
equipment, office electronics, personal computers,
and any other system where thermal management is
critical to performance. The LM75B and LM75C are
available in an SOIC package or VSSOP package.
UL Recognized Component (LM75B and
LM75C)
APPLICATIONS
•
•
•
•
General System Thermal Management
Communications Infrastructure
Electronic Test Equipment
Environmental Monitoring
KEY SPECIFICATIONS
•
Supply Voltage
LM75B, LM75C: 3.0V to 5.5V
Supply Current
–
•
–
–
Operating: 280 μA (typ)
Shutdown: 4 μA (typ)
•
Temperature Accuracy
–
–
−25°C to 100°C: ±2°C (max)
−55°C to 125°C: ±3°C (max)
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009–2013, Texas Instruments Incorporated
LM75B, LM75C
SNIS153B –JULY 2009–REVISED MARCH 2013
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Simplified Block Diagram
+V
S
8
3
Temperature
Threshold
O.S.
10-Bit
Digital
Decimation
Filter
Ð
T
Set Point
OS
Register
1-Bit
D/A
Set Point
Comparator
9-Bit Sigma-Delta ADC
Reset
Silicon Bandgap
Temperature
Sensor
T
Set
Configuration
Register
Pointer
Register
HYST
Point Register
1
7
A0
SDA
SCL
6
A1
Two-Wire Interface
2
5
A2
4
GND
Figure 1.
Connection Diagram
LM75B, LM75C, SOIC and VSSOP
PIN DESCRIPTIONS
Label
SDA
SCL
Pin #
Function
I2C Serial Bi-Directional Data Line.
Open Drain.
Typical Connection
1
From Controller, tied to a pull-up resistor or current source
From Controller, tied to a pull-up resistor or current source
Pull–up Resistor, Controller Interrupt Line
Ground
2
3
I2C Clock Input
Over temperature Shutdown.
Open Drain Output
O.S.
GND
+VS
4
Power Supply Ground
DC Voltage from 3V to 5.5V; 100 nF bypass capacitor with 10 µF
bulk capacitance in the near vicinity
8
Positive Supply Voltage Input
User-Set I2C Address Inputs
A0–A2
7,6,5
Ground (Low, “0”) or +VS (High, “1”)
2
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Typical Application
+V
8
100 nF (typ) unless mounted
close to processor
S
7
A0
A1
A2
Address
6
5
(Set as desired)
3
To Processor
Interrupt Line
LM75
O.S.
1
2
SDA
SCL
O.S. set to active low
for wire OR‘d multiple
interrupt line
Interface
4
GND
Figure 2. Typical Application
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
Absolute Maximum Ratings(1)
Supply Voltage Pin (+VS)
Voltage at A0, A1and A2 Pins
Voltage at OS, SCL and SDA Pins
Input Current at any Pin(2)
Package Input Current(2)
Storage Temperature
−0.3V to 6.5V
−0.3V to (+VS + 0.3V) and must be ≤ 6.5V
−0.3V to 6.5V
5 mA
20 mA
−65°C to +150°C
2500V
LM75B
LM75C
LM75B
LM75C
Human Body Model
Machine Model
1500V
ESD Susceptibility(3)
250V
100V
O.S. Output Sink Current
O.S. Output Voltage
10 mA
6.5V
(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.
(2) When the input voltage (VI) at any pin exceeds the power supplies (VI < GND or VI > +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 exceed the power supplies with an input
current of 5 mA to four.
(3) Human body model, 100 pF discharged through a 1.5 kΩ resistor. Machine model, 200 pF discharged directly into each pin. The
Charged Device Model (CDM) is a specified circuit characterizing an ESD event that occurs when a device acquires charge through
some triboelectric (frictional) or electrostatic induction processes and then abruptly touches a grounded object or surface.
Operating Ratings(1)(2)
Specified Temperature Range
See(3)
TMIN to TMAX
−55°C to +125°C
+3.0V to +5.5V
Supply Voltage Range (+VS) LM75B, LM75C
(1) Soldering process must comply with Texas Instruments Incorporated Reflow Temperature Profile specifications. Refer to
(2) Reflow temperature profiles are different for lead-free and non-lead-free packages.
(3) LM75 θJA (thermal resistance, junction-to-ambient) when attached to a printed circuit board with 2 oz. foil similar to the one shown in
Figure 5 is summarized in the table below:
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Thermal
Resistance
Package
Number
Device Number
(θJA
)
LM75BIM-3, LM75BIM-5,
LM75CIM-3, LM75CIM-5
D (R-PDSO-G8)
200°C/W
250°C/W
LM75BIMM-3, LM75BIMM-5,
LM75CIMM-3, LM75CIMM-5
DGK (S-PDSO-
G8)
Temperature-to-Digital Converter Characteristics(1)
Unless otherwise noted, these specifications apply for: +VS = +5 Vdc for LM75BIM-5, LM75BIMM-5, LM75CIM-5, and
LM75CIMM-5; and +VS = +3.3 Vdc for LM75BIM-3, LM75BIMM-3, LM75CIM-3, and LM75CIMM-3(2). Boldface limits apply
for TA = TJ = TMIN to TMAX; all other limits TA = TJ = +25°C, unless otherwise noted.
Parameter
Conditions
TA = −25°C to +100°C
TA = −55°C to +125°C
Typical(3)
Limits(4)
Units (Limit)
±2.0
Accuracy
°C (max)
±3.0
Resolution
9
100
0.25
4
Bits
Temperature Conversion Time
See(5)
I2C Inactive
300
0.5
ms (max)
mA (max)
LM75B
LM75C
Shutdown Mode, +VS = 3V
Shutdown Mode, +VS = 5V
I2C Inactive
μA
mA (max)
μA
6
Quiescent Current
0.25
4
1.0
Shutdown Mode, +VS = 3V
Shutdown Mode, +VS = 5V
IOUT = 4.0 mA
6
O.S. Output Saturation Voltage
O.S. Delay
0.8
(6)1
6
V (max)
Conversion (min)
Conversions (max)
TOS Default Temperature
THYST Default Temperature
80
75
See(7)
°C
(1) For best 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.
(2) All part numbers of the LM75 will operate properly over the +VS supply voltage range of 3V to 5.5V. The devices are tested and
specified for rated accuracy at their nominal supply voltage. Accuracy will typically degrade 1°C/V of variation in +VS as it varies from
the nominal value.
(3) Typicals are at TA = 25°C and represent most likely parametric norm.
(4) Limits are specified to AOQL (Average Outgoing Quality Level).
(5) 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 is accessed, the
conversion that is in process will be interrupted and it will be restarted after the end of the communication. Accessing the LM75
continuously without waiting at least one conversion time between communications will prevent the device from updating the
Temperature Register with a new temperature conversion result. Consequently, the LM75 should not be accessed continuously with a
wait time of less than 300 ms.
(6) O.S. Delay is user programmable up to 6 “over limit” conversions before O.S. is set to minimize false tripping in noisy environments.
(7) Default values set at power up.
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Logic Electrical Characteristics
DIGITAL DC CHARACTERISTICS
Unless otherwise noted, these specifications apply for +VS = +5 Vdc for LM75BIM-5, LM75BIMM-5, LM75CIM-5, and
LM75CIMM-5; and +VS = +3.3 Vdc for LM75BIM-3, LM75BIMM-3, LM75CIM-3, and LM75CIMM-3(1). Boldface limits apply
for TA = TJ = TMIN to TMAX; all other limits TA = TJ = +25°C, unless otherwise noted.
Symbol
Parameter
Conditions
Typical(2)
Limits(3)
+VS × 0.7
+VS + 0.3
−0.3
Units (Limit)
V (min)
VIN(1)
Logical “1” Input Voltage
V (max)
V (min)
VIN(0)
Logical “0” Input Voltage
+VS × 0.3
1.0
V (max)
μA (max)
μA (max)
pF
IIN(1)
IIN(0)
CIN
Logical “1” Input Current
Logical “0” Input Current
All Digital Inputs
VIN = +VS
0.005
−0.005
5
VIN = 0V
−1.0
LM75B
LM75C
VOH = 5V
10
μA (max)
μA (max)
V (max)
ns (max)
IOH
High Level Output Current
VOH = 5V
100
0.4
250
VOL
tOF
Low Level Output Voltage
Output Fall Time
IOL = 3 mA
CL = 400 pF IO = 3 mA
(1) All part numbers of the LM75 will operate properly over the +VS supply voltage range of 3V to 5.5V. The devices are tested and
specified for rated accuracy at their nominal supply voltage. Accuracy will typically degrade 1°C/V of variation in +VS as it varies from
the nominal value.
(2) Typicals are at TA = 25°C and represent most likely parametric norm.
(3) Limits are specified to AOQL (Average Outgoing Quality Level).
Logic Electrical Characteristics
I2C Digital Switching Characteristics
Unless otherwise noted, these specifications apply for VS = +5 Vdc for LM75BIM-5, LM75BIMM-5, LM75CIM-5, and
LM75CIMM-5; and +VS = +3.3 Vdc for LM75BIM-3, LM75BIMM-3, LM75CIM-3, and LM75CIMM-3CL (load capacitance) on
output lines = 80 pF unless otherwise specified. Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ =
+25°C, unless otherwise noted.
Units
Symbol
Parameter
Conditions Typical(1)
Limits(2)(3)
(Limit)
μs (min)
ns (min)
ns (min)
ns (min)
ns (min)
t1
SCL (Clock) Period
2.5
100
0
t2
t3
t4
t5
Data in Set-Up Time to SCL High
Data Out Stable after SCL Low
SDA Low Set-Up Time to SCL Low (Start Condition)
SDA High Hold Time after SCL High (Stop Condition)
100
100
75
325
ms (min)
ms (max)
LM75B
LM75C
tTIMEOUT SDA Time Low for Reset of Serial Interface(4)
Not Applicable
(1) Typicals are at TA = 25°C and represent most likely parametric norm.
(2) Limits are specified to AOQL (Average Outgoing Quality Level).
(3) Timing specifications are tested at the bus input logic levels (Vin(0)=0.3xVA for a falling edge and Vin(1)=0.7xVA for a rising edge) when
the SCL and SDA edge rates are similar.
(4) Holding the SDA line low for a time greater than tTIMEOUT will cause the LM75B to reset SDA to the IDLE state of the serial bus
communication (SDA set High).
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Figure 3.
Figure 4. Temperature-to-Digital Transfer Function (Non-linear scale for clarity)
Figure 5. Printed Circuit Board Used for Thermal Resistance Specifications
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TYPICAL PERFORMANCE CHARACTERISTICS
Static Quiescent Current vs Temperature (LM75C)
Dynamic Quiescent Current vs Temperature (LM75C)
Figure 6.
Figure 7.
Accuracy vs Temperature (LM75C)
Figure 8.
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FUNCTIONAL DESCRIPTION
The LM75 temperature sensor incorporates a band-gap type temperature sensor and 9-bit ADC (Sigma-Delta
Analog-to-Digital Converter). The temperature data output of the LM75 is available at all times via the I2C 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.
The LM75B contains all the functionality of the LM75C, plus two additional features:
1. The LM75B has an integrated low-pass filter on both the SDA and the SCL line. These filters increase
communications reliability in noisy environments.
2. The LM75B also has a bus fault timeout feature. If the SDA line is held low for longer than tTIMEOUT (see
Logic Electrical Characteristics) the LM75B will reset to the IDLE state (SDA set to high impedance) and wait
for a new start condition. The TIMEOUT feature is not functional in Shutdown Mode.
O.S. OUTPUT, TOS AND THYST LIMITS
In Comparator mode the O.S. Output behaves like a thermostat. The output becomes active when temperature
exceeds the TOS limit, and leaves the active state when the temperature drops below the THYST 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 TOS also makes O.S. active but O.S. will remain active indefinitely until reset by
reading any register via the I2C interface. Once O.S. has been activated by crossing TOS, then reset, it can be
activated again only by Temperature going below THYST. Again, it will remain active indefinitely until being reset
by a read. Placing the LM75 in shutdown mode also resets the O.S. Output.
POWER UP AND POWER DOWN
The LM75 always powers up in a known state. The power up default conditions are:
1. Comparator mode
2. TOS = 80°C
3. THYST = 75°C
4. O.S. active low
5. Pointer = “00”
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.
Stand-Alone Thermostat Mode
If the LM75 is not connected to the I2C bus on power up, it will act as a stand-alone thermostat with the power up
default conditions listed above. It is optional, but recommended, to connect the address pins (A2, A1, A0) and
the SCL and SDA pins together and to a 10k pull-up resistor to +VS for better noise immunity. Any of these pins
may also be tied high separately through a 10k pull-up resistor.
I2C BUS INTERFACE
The LM75 operates as a slave on the I2C 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 I2C 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 +VS for a high, (1).
Therefore, the complete slave address is:
1
0
0
1
A2
A1
A0
MSB
LSB
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These interrupt 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 9. O.S. Output Temperature Response Diagram
TEMPERATURE DATA FORMAT
Temperature data can be read from the Temperature, TOS Set Point, and THYST Set Point registers; and written to
the TOS Set Point, and THYST 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:
Digital Output
Temperature
Binary
Hex
0FAh
032h
001h
000h
1FFh
1CEh
192h
+125°C
+25°C
+0.5°C
0°C
0 1111 1010
0 0011 0010
0 0000 0001
0 0000 0000
1 1111 1111
1 1100 1110
1 1001 0010
−0.5°C
−25°C
−55°C
SHUTDOWN MODE
Shutdown mode is enabled by setting the shutdown bit in the Configuration register via the I2C bus. Shutdown
mode reduces power supply current significantly. See specified quiescent current specification in the
Temperature-to-Digital Converter Characteristics table. In Interrupt mode O.S. is reset if previously set and is
undefined in Comparator mode during shutdown. The I2C interface remains active. Activity on the clock and data
lines of the I2C bus may slightly increase shutdown mode quiescent current. TOS, THYST, and Configuration
registers can be read from and written to in shutdown mode.
For the LM75B, the TIMEOUT feature is turned off in Shutdown Mode.
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.
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COMPARATOR/INTERRUPT MODE
As indicated in the O.S. Output Temperature Response Diagram, Figure 9, 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.
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.
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
Temperature Response Diagram, Figure 9. Active high simply inverts the polarity of the O.S. output.
INTERNAL REGISTER STRUCTURE
SCL
2
I C Interface
SDA
Data
Address
Pointer Register
(Selects register for
communication)
Configuration
(Read-Write)
Temperature
(Read-Only)
Pointer = 00000001
Pointer = 00000000
T
Set Point
T
Set Point
OS
HYST
(Read-Write)
Pointer = 00000010
(Read-Write)
Pointer = 00000011
Figure 10.
There are four data registers in the LM75B and LM75C selected by the Pointer register. At power-up the Pointer
is set to “000”; 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 a 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 TOS and THYST registers require 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).
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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 11. 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.
Figure 11. Inadvertent 8-Bit Read from 16-Bit Register where D7 is Zero (“0”)
POINTER REGISTER (Selects which registers will be read from or written to):
P7
P6
P5
P4
P3
P2
P1
P0
0
0
0
0
0
Register Select
P0-P1: Register Select:
P2
0
P1
0
P0
0
Register
Temperature (Read only) (Power-up default)
Configuration (Read/Write)
THYST (Read/Write)
0
0
1
0
1
0
0
1
1
TOS (Read/Write)
P3–P7: Must be kept zero.
TEMPERATURE REGISTER (Read Only):
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
MSB
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
LSB
X
X
X
X
X
X
X
D0–D6: Undefined.
D7–D15: Temperature Data. One LSB = 0.5°C. Two's complement format.
CONFIGURATION REGISTER (Read/Write):
D7
D6
D5
D4
D3
D2
D1
D0
0
0
0
Fault Queue
O.S. Polarity
Cmp/Int
Shutdown
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. See specified temperature conversion time in the
Temperature-to-Digital Converter Characteristics table.
D4
0
D3
0
Number of Faults
1 (Power-up default)
0
1
2
4
6
1
0
1
1
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D5–D7: These bits are used for production testing and must be kept zero for normal operation.
THYST AND TOS REGISTER (Read/Write):
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
MSB
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
LSB
X
X
X
X
X
X
X
D0–D6: Undefined
75°C
D7–D15: THYST Or TOS Trip Temperature Data. Power up default is TOS = 80°C, THYST =
TEST CIRCUIT DIAGRAMS
Figure 12.
12
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LM75B, LM75C
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SNIS153B –JULY 2009–REVISED MARCH 2013
Figure 13. I2C Timing Diagrams (Continued)
Copyright © 2009–2013, Texas Instruments Incorporated
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LM75B, LM75C
SNIS153B –JULY 2009–REVISED MARCH 2013
www.ti.com
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 VSSOP package for the
LM75B and LM75C, 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 SOIC 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.
DIGITAL NOISE ISSUES
The LM75B features an integrated low-pass filter on both the SCL and the SDA digital lines to mitigate the
effects of bus noise. Although this filtering makes the LM75B communication robust in noisy environments, good
layout practices are always recommended. Minimize noise coupling by keeping digital traces away from
switching power supplies. Also, ensure that digital lines containing high-speed data communications cross at
right angles to the SDA and SCL lines.
Excessive noise coupling into the SDA and SCL lines on the LM75C-specifically noise with amplitude greater
than 400 mVpp (the LM75’s typical hysteresis), overshoot greater than 300 mV above +Vs, and undershoot more
than 300 mV below GND-may prevent successful serial communication with the LM75C. Serial bus no-
acknowledge is the most common symptom, causing unnecessary traffic on the bus. The layout procedures
mentioned above apply also to the LM75C. Although the serial bus maximum frequency of communication is only
400 kHz, care must be taken to ensure proper termination within a system with long printed circuit board traces
or multiple parts on the bus. Resistance can be added in series with the SDA and SCL lines to further help filter
noise and ringing. A 5 kΩ resistor should be placed in series with the SCL line, placed as close as possible to the
SCL pin on the LM75C. This 5 kΩ resistor, with the 5 pF to 10 pF stray capacitance of the LM75 provides a 6
MHz to 12 MHz low pass filter, which is sufficient filtering in most cases.
TYPICAL APPLICATIONS
+V
S
+12V
C1
100 nF
R3
10k
+12V/300 mA
Fan Motor
R1
10k
R2
10k
Optional but
Recommended
Pull-up
In Stand-alone
Mode
8
Q2
NDP410A
series
A0
7
6
5
Q1
2N3904
A1
A2
3
O.S.
LM75
SDA 1
SCL 2
4
GND
When using the two-wire interface: program O.S. for active high and connect O.S. directly to Q2's gate.
Figure 14. Simple Fan Controller, Interface Optional
14
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LM75B, LM75C
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SNIS153B –JULY 2009–REVISED MARCH 2013
+ 5 VDC
Heater
Heater
Supply
C1
100 nF
R2
10k
Optional but
Recommended
Pull-up In
Stand-alone
Mode
K1
5V
Relay
D1
1N4001
R1
+V
S
10k
8
A0
7
6
5
A1
A2
Q1
2N2222A
3
LM75
O.S.
SDA 1
SCL 2
4
GND
Figure 15. Simple Thermostat, Interface Optional
+V
S
C6
100 nF
R3
10k
R1
10k
Optional but
Recommended
Pull-up
In Stand-alone
Mode
SHUTDOWN Vo2
BYPASS
+IN
GND
8
V
DD
C1
100 nF
LM4861M
A0
A1
A2
7
6
5
-IN
Vo1
C2
100 nF
3
R5 200k
LM75
O.S.
SDA 1
SCL 2
C3
C4
C5
6.8 nF
6.8 nF
6.8 nF
4
GND
R2
10k
R3
10k
R4
10k
Figure 16. Temperature Sensor with Loudmouth Alarm (Barking Watchdog)
Copyright © 2009–2013, Texas Instruments Incorporated
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LM75B, LM75C
SNIS153B –JULY 2009–REVISED MARCH 2013
www.ti.com
REVISION HISTORY
Changes from Revision A (March 2013) to Revision B
Page
•
Changed layout of National Data Sheet to TI format .......................................................................................................... 15
16
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Product Folder Links: LM75B LM75C
PACKAGE OPTION ADDENDUM
www.ti.com
11-Apr-2013
PACKAGING INFORMATION
Orderable Device
LM75BIM-3
Status Package Type Package Pins Package
Eco Plan Lead/Ball Finish
MSL Peak Temp
Op Temp (°C)
-55 to 125
-55 to 125
-55 to 125
-55 to 125
Top-Side Markings
Samples
Drawing
Qty
(1)
(2)
(3)
(4)
ACTIVE
SOIC
SOIC
SOIC
SOIC
D
8
8
8
8
95
TBD
Call TI
CU SN
Call TI
CU SN
Call TI
LM75
BIM-3
LM75BIM-3/NOPB
LM75BIM-5
ACTIVE
ACTIVE
ACTIVE
D
D
D
95
95
95
Green (RoHS
& no Sb/Br)
Level-1-260C-UNLIM
Call TI
LM75
BIM-3
TBD
LM75
BIM-5
LM75BIM-5/NOPB
Green (RoHS
& no Sb/Br)
Level-1-260C-UNLIM
LM75
BIM-5
LM75BIMM-3
ACTIVE
ACTIVE
VSSOP
VSSOP
DGK
DGK
8
8
1000
1000
TBD
Call TI
CU SN
Call TI
-55 to 125
-55 to 125
T01B
LM75BIMM-3/NOPB
Green (RoHS
& no Sb/Br)
Level-1-260C-UNLIM
T01B
LM75BIMM-5
ACTIVE
ACTIVE
VSSOP
VSSOP
DGK
DGK
8
8
1000
1000
TBD
Call TI
CU SN
Call TI
-55 to 125
-55 to 125
T00B
T00B
LM75BIMM-5/NOPB
Green (RoHS
& no Sb/Br)
Level-1-260C-UNLIM
LM75BIMMX-3
ACTIVE
ACTIVE
VSSOP
VSSOP
DGK
DGK
8
8
3500
3500
TBD
Call TI
CU SN
Call TI
-55 to 125
-55 to 125
T01B
T01B
LM75BIMMX-3/NOPB
Green (RoHS
& no Sb/Br)
Level-1-260C-UNLIM
LM75BIMMX-5
ACTIVE
ACTIVE
VSSOP
VSSOP
DGK
DGK
8
8
3500
3500
TBD
Call TI
CU SN
Call TI
-55 to 125
-55 to 125
T00B
T00B
LM75BIMMX-5/NOPB
Green (RoHS
& no Sb/Br)
Level-1-260C-UNLIM
LM75BIMX-3
LM75BIMX-3/NOPB
LM75BIMX-5
ACTIVE
ACTIVE
ACTIVE
ACTIVE
SOIC
SOIC
SOIC
SOIC
D
D
D
D
8
8
8
8
2500
2500
2500
2500
TBD
Call TI
CU SN
Call TI
CU SN
Call TI
-55 to 125
-55 to 125
-55 to 125
-55 to 125
LM75
BIM-3
Green (RoHS
& no Sb/Br)
Level-1-260C-UNLIM
Call TI
LM75
BIM-3
TBD
LM75
BIM-5
LM75BIMX-5/NOPB
Green (RoHS
& no Sb/Br)
Level-1-260C-UNLIM
LM75
BIM-5
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
11-Apr-2013
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4)
Multiple Top-Side Markings will be inside parentheses. Only one Top-Side Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a
continuation of the previous line and the two combined represent the entire Top-Side Marking for that device.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
26-Mar-2013
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
B0
K0
P1
W
Pin1
Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant
(mm) W1 (mm)
LM75BIMM-3
LM75BIMM-3/NOPB
LM75BIMM-5
VSSOP
VSSOP
VSSOP
VSSOP
VSSOP
VSSOP
VSSOP
VSSOP
SOIC
DGK
DGK
DGK
DGK
DGK
DGK
DGK
DGK
D
8
8
8
8
8
8
8
8
8
8
8
8
1000
1000
1000
1000
3500
3500
3500
3500
2500
2500
2500
2500
178.0
178.0
178.0
178.0
330.0
330.0
330.0
330.0
330.0
330.0
330.0
330.0
12.4
12.4
12.4
12.4
12.4
12.4
12.4
12.4
12.4
12.4
12.4
12.4
5.3
5.3
5.3
5.3
5.3
5.3
5.3
5.3
6.5
6.5
6.5
6.5
3.4
3.4
3.4
3.4
3.4
3.4
3.4
3.4
5.4
5.4
5.4
5.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
2.0
2.0
2.0
2.0
8.0
8.0
8.0
8.0
8.0
8.0
8.0
8.0
8.0
8.0
8.0
8.0
12.0
12.0
12.0
12.0
12.0
12.0
12.0
12.0
12.0
12.0
12.0
12.0
Q1
Q1
Q1
Q1
Q1
Q1
Q1
Q1
Q1
Q1
Q1
Q1
LM75BIMM-5/NOPB
LM75BIMMX-3
LM75BIMMX-3/NOPB
LM75BIMMX-5
LM75BIMMX-5/NOPB
LM75BIMX-3
LM75BIMX-3/NOPB
LM75BIMX-5
SOIC
D
SOIC
D
LM75BIMX-5/NOPB
SOIC
D
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
26-Mar-2013
*All dimensions are nominal
Device
Package Type Package Drawing Pins
SPQ
Length (mm) Width (mm) Height (mm)
LM75BIMM-3
LM75BIMM-3/NOPB
LM75BIMM-5
VSSOP
VSSOP
VSSOP
VSSOP
VSSOP
VSSOP
VSSOP
VSSOP
SOIC
DGK
DGK
DGK
DGK
DGK
DGK
DGK
DGK
D
8
8
8
8
8
8
8
8
8
8
8
8
1000
1000
1000
1000
3500
3500
3500
3500
2500
2500
2500
2500
210.0
210.0
210.0
210.0
367.0
367.0
367.0
367.0
367.0
367.0
367.0
367.0
185.0
185.0
185.0
185.0
367.0
367.0
367.0
367.0
367.0
367.0
367.0
367.0
35.0
35.0
35.0
35.0
35.0
35.0
35.0
35.0
35.0
35.0
35.0
35.0
LM75BIMM-5/NOPB
LM75BIMMX-3
LM75BIMMX-3/NOPB
LM75BIMMX-5
LM75BIMMX-5/NOPB
LM75BIMX-3
LM75BIMX-3/NOPB
LM75BIMX-5
SOIC
D
SOIC
D
LM75BIMX-5/NOPB
SOIC
D
Pack Materials-Page 2
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