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부품번호 LM40 기능
기능 Hardware Monitor with Dual Thermal Diodes and SensorPath Bus
제조업체 National Semiconductor
로고 National Semiconductor 로고


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LM40 데이터시트, 핀배열, 회로
May 2004
LM40
Hardware Monitor with Dual Thermal Diodes and
SensorPathBus
General Description
The LM40 is a hardware monitor that measures 3 tempera-
ture zones, 5 voltages and has a single-wire interface com-
patible with National Semiconductor’s SensorPath bus. Sen-
sorPath data is pulse width encoded, thereby allowing the
LM40 to be easily connected to many general purpose
micro-controllers. Several National Semiconductor Super I/O
products include a fully integrated SensorPath master, that
when connected to the LM40 can realize a hardware monitor
function that includes limit checking for measured values,
autonomous fan speed control and many other functions.
The LM40 measures the temperature of its own die as well
as two external devices such as a processor thermal diode
or a diode connected transistor. The LM40 can resolve tem-
peratures up to 255˚C and down to -256˚C. The operating
temperature range of the LM40 is 0˚C to +125˚C. Using Σ∆
ADC it measures +1.2V, +2.5V, +3.3V, +5V and +12V analog
input voltages with internal scaling resistors.The address
programming pin allows two LM40s to be placed on one
SensorPath bus.
Features
n SensorPath Interface
— 2 hardware programmable addresses
n Voltage Monitoring
— 9-bit Σ∆ ADC
— Internal scaling resistors for all inputs
— Monitors +1.2V, +2.5 V, +3.3 V, +5 V and +12 V
n Temperature Sensing
— 2 remote diode temperature sensor zones
— Internal local temperature zone
— 0.5 ˚C resolution
— Measures temperatures up to 140 ˚C
n 14-lead TSSOP package
Key Specifications
n Voltage Measurement Accuracy
n Temperature Sensor Accuracy
n Temperature Range:
— LM40 junction
— Remote Temp Accuracy
n Power Supply Voltage
n Average Power Supply Current
n Conversion Time (all Channels)
±2 % (max)
±3 ˚C (max)
0 ˚C to +85 ˚C
0 ˚C to +100 ˚C
+3.0 V to +3.6 V
0.5 mA (typ)
29.6ms to 1456ms
Applications
n Microprocessor based equipment
(Motherboards, Video Cards, Base-stations, Routers,
ATMs, Point of Sale, …)
n Power Supplies
Typical Application
SensorPathis a trademark of National Semiconductor Corporation
© 2004 National Semiconductor Corporation DS200684
20068401
www.national.com




LM40 pdf, 반도체, 판매, 대치품
Absolute Maximum Ratings
(Notes 2, 1)
Supply Voltage (V+)
Voltage at Any Digital Input or
Output Pin
Voltage on 12V Analog Input
Voltage on 5V Analog Input
Voltage on D1+ and D2+
Voltage on Other Analog Inputs
Current on D1- and D2-
Input Current per Pin(Note 3)
Package Input Current (Note 3)
Package Power Dissipation
Output Sink Current
ESD Susceptibility (Note 5)
Human Body Model
Machine Model
Storage Temperature
−0.5 V to 6.0 V
−0.5 V to 6.0 V
−0.5 V to 16 V
−0.5 V to 6.67 V
−0.5 V to (V+ + 0.05 V)
−0.5 V to 6.0 V
±1 mA
±5 mA
±30 mA
(Note 4)
10 mA
2500 V
250 V
−65˚C to +150˚C
Soldering process must comply with National’s reflow
temperature profile specifications. Refer to
www.national.com/packaging/. (Note 6)
Operating Ratings
(Notes 1, 2)
Temperature Range for Electrical Characteristics
LM40CIMT (TMINTATMAX)
Operating Temperature Range
Remote Diode Temperature (TD)
Range
Supply Voltage Range (V+)
0˚C TA +85˚C
0˚C TA +125˚C
-5 ˚C TD +140 ˚C
+3.0 V to +3.6 V
Analog Input Voltage Rage:
+1.2V and +2.5V
−0.05V to
(V+ + 0.05V)
+3.3V_SBY (V+)
+3.0V to +3.6V
+5V −0.05V to +6.67V
+12V
−0.05V to +16V
DC Electrical Characteristics
The following specifications apply for V+ = +3.0 VDC to +3.6 VDC, and all analog source impedance RS = 50 unless other-
wise specified in the conditions. Boldface limits apply for LM40CIMT TA = TJ = TMIN=0˚C to TMAX=85˚C; all other limits
TA = +25˚C. TA is the ambient temperature of the LM40; TJ is the junction temperature of the LM40; TD is the junction tem-
perature of the remote thermal diode.
POWER SUPPLY CHARACTERISTICS
Symbol
Parameter
Conditions
V+ Power Supply Voltage
I+Shutdown Shutdown Power Supply Current
I+Average Average Power Supply Current
I+Peak
Peak Power Supply Current
SensorPath Bus Inactive
(Note 9)
SensorPath Bus Inactive; all
sensors enabled;
tCONV=182 ms; (Note 9)
SensorPath Bus Inactive
(Note 9)
Power-On Reset Threshold Voltage
TEMPERATURE-TO-DIGITAL CONVERTER CHARACTERISTICS
Parameter
Conditions
Temperature Accuracy Using the Remote Thermal
Diode, see (Note 12) for Thermal Diode Processor
Type.
Temperature Accuracy Using the Local Diode
Remote Diode and Local Temperature Resolution
TJ = 0˚C to
+85˚C
TD = +25˚C
TJ = 0˚C to
+85˚C
TD = 0˚C to
+100˚C
TJ = 0˚C to
+85˚C
TD = +100˚C to
+125˚C
TJ = 0˚C to +85˚C (Note 10)
D− Source Voltage
Typical
(Note 7)
3.3
Limits
(Note 8)
3.0
3.6
260 420
900
3.3
1.6
2.8
Typical Limits
(Note 7) (Note 8)
±1 ±2.5
±3
±4
±1 ±3
10
0.5
0.7
Units
(Limit)
V (min)
V (max)
µA (max)
µA (max)
mA (max)
V (min)
V (max)
Units
(Limits)
˚C (max)
˚C (max)
˚C (max)
˚C (max)
Bits
˚C
V
www.national.com
4

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LM40 전자부품, 판매, 대치품
PIN Pin
# Name
1 NC
Pin
Circuit
A
2 GND
B
V+/
3
3.3V SB
B
4 SWD
A
5 ADD
A
6 +1.2V
C
7 +2.5V
C
8 D1-
D
9 D1+
E
10 D2-
D
11 D2+
E
All Input Structure Circuits
Circuit A
Circuit B
Circuit C
Circuit D
12 +5V
C
13 +12V
C
14 NC
A
Circuit E
Note 4: Thermal resistance junction-to-ambient in still air when attached to a printed circuit board with 1 oz. foil is 148 ˚C/W.
Note 5: Human body model, 100 pF discharged through a 1.5 kresistor. Machine model, 200 pF discharged directly into each pin.
Note 6: Reflow temperature profiles are different for lead-free and non lead-free packages.
Note 7: “Typicals” are at TA = 25˚C and represent most likely parametric norm. They are to be used as general reference values not for critical design calculations.
Note 8: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 9: The supply current will not increase substantially with a SensorPath transaction.
Note 10: Local temperature accuracy does not include the effects of self-heating. The rise in temperature due to self-heating is the product of the internal power
dissipation of the LM40 and the thermal resistance. See (Note 4) for the thermal resistance to be used in the self-heating calculation.
Note 11: TUE , total unadjusted error, includes ADC gain, offset, linearity and reference errors. TUE is defined as the "actual Vin" to achieve a given code transition
minus the "theoretical Vin" for the same code. Therefore, a positive error indicates that the input voltage is greater than the theoretical input voltage for a given code.
If the theoretical input voltage was applied to an LM40 that has positive error, the LM40’s reading would be less than the theoretical.
Note 12: The accuracy of the LM40CIMT is guaranteed when using the thermal diode of an Intel 90 nm Pentium 4 processor or any thermal diode with a non-ideality
factor of 1.011 and series resistance of 3.33. When using a MMBT3904 type transistor as a thermal diode the error band will be typically shifted by -4.5 ˚C.
Note 13: This specification is provided only to indicate how often temperature and voltage data are updated.
Note 14: The output fall time is measured from (VIH min) to (VIL max).
Note 15: The output rise time is measured from (VIL max) to (VIH min).
Note 16: The rise and fall times are not tested but guaranteed by design.
7 www.national.com

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