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National Semiconductor
National Semiconductor

LM41 Datasheet

Hardware Monitor with Thermal Diode Inputs and SensorPath Bus


LM41 Datasheet Preview


May 2004
LM41
Hardware Monitor with Thermal Diode Inputs and
SensorPathBus
General Description
The LM41 is a hardware monitor that measures 2 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
LM41 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 LM41 can realize a hardware monitor
function that includes limit checking for measured values,
autonomous fan speed control and many other functions.
The LM41 measures the temperature of its own die as well
as one external device such as a processor thermal diode or
a diode connected transistor. The LM41 can resolve tem-
peratures up to 255˚C and down to -256˚C. The operating
temperature range of the LM41 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 LM41’s 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
— Remote diode temperature sensor zone
— 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:
— LM41 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)
22.1ms 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 DS200703
20070301
www.national.com
Page 1

Connection Diagram
TSSOP-14
Order
Number
LM41CIMT
LM41CIMTX
Package
Marking
LM41
CIMT
LM41
CIMT
NS
Package
Number
MTC14C
MTC14C
Transport
Media
94 units per
rail
2500 units in
tape and reel
20070302
Top View
National Package Number MTC14C
Pin Description
Pin Number
1, 10, 13, 14
Pin Name
NC
2 GND
3 V+/+3.3V_SBY
4 SWD
5 ADD
6 +1.2V
7 +2.5V
8 D-
9 D+
11 +5V
12 +12V
Description
Typical Connection
No Connect
May be tied to V+, GND or left floating. Do
not tie active signals to pin 10.
Ground
System ground
Positive power supply pin as well Connected system 3.3 V standby power and
as a +3.3V voltage monitor
to a 0.1 µF bypass capacitor in parallel with
100 pF. A bulk capacitance of approximately
10 µF needs to be in the near vicinity of the
LM41.
SensorPath Bus line; Open-drain Super I/O, Pull-up resistor, 1.6k
output
Digital input - device number select Pull-up to 3.3 V or pull-down to GND resistor,
input for the serial bus device
10k; must never be left floating
number
+1.2V voltage monitoring input with Processor core voltage to be monitored
scaling resistors
+2.5V voltage monitoring input with Power supply voltage to be monitored
scaling resistors
Thermal diode analog voltage
Remote Thermal Diode cathode
output and negative monitoring
(THERM_DC) - Can be connected to a CPU
input
or thermal diode, an MMBT3904 or a GPU
thermal diode. A 100 pF capacitor should be
connected between respective D- and D+ for
noise filtering.
Thermal diode analog current
Remote Thermal Diode anode (THERM_DA) -
output and positive monitoring input Can be connected to a CPU or thermal diode,
an MMBT3904 or a GPU thermal diode. A
100 pF capacitor should be connected
between respective D- and D+ for noise
filtering.
+5V voltage monitoring input with Power supply voltage to be monitored
scaling resistors
+12V voltage monitoring input with Power supply voltage to be monitored
scaling resistors
www.national.com
2
Page 2

Block Diagram
20070303
3 www.national.com
Page 3

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 D+
Voltage on Other Analog Inputs
Current on D-
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
LM41CIMT (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 LM41CIMT TA = TJ = TMIN=0˚C to TMAX=85˚C; all other limits
TA = +25˚C. TA is the ambient temperature of the LM41; TJ is the junction temperature of the LM41; 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
Page 4
Part Number LM41
Manufactur National Semiconductor
Description Hardware Monitor with Thermal Diode Inputs and SensorPath Bus
Total Page 27 Pages
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LM41 datasheet
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LM41 datasheet
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LM4753 , LM4755 , LM4755T , LM4756 , LM4765 , LM4765T , LM4766 , LM4766T , LM4780 , LM4780 , LM4780TA , LM4780TA , LM4780TABD , LM4781 , LM4781TA , LM4782 , LM4782TA , LM480261 , LM4802B , LM4802BLQ , LM4805 , LM4808 , LM4808M , LM4808MM , LM4809 , LM4809LD , LM4809MA , LM4809MM , LM4810 , LM4810 , LM4810LD , LM4810MA , LM4810MM , LM4811 , LM4811 , LM4811LD , LM4811MM , LM4816 , LM4817 , LM4817 , LM4818 , LM4818 , LM4818M , LM4819 , LM4819 , LM4819LD , LM4819M , LM4819MM , LM4820-6 , LM4820IBP-6 , LM4820IBPX-6 , LM4820M-6 , LM4820MM-6 , LM4830 , LM4830M , LM4830N , LM4831 , LM48310 , LM48311 , LM4831VF , LM4832 , LM4832M , LM4832N , LM4834 , LM4834MS , LM4835 , LM4835MT , LM4835MTE , LM4836 , LM4836MT , LM4836MTE , LM4838 , LM4838ITL , LM4838ITLX , LM4838LQ , LM4838MT , LM4838MTE , LM4839 , LM4839LQ , LM4839MT , LM4839MTE , LM4840 , LM4840LQ , LM4840MH , LM4840MT , LM4841 , LM48413 , LM4841LQ , LM4841MH , LM4841MT , LM4842 , LM4842 , LM4842LQ , LM4842MH , LM4842MT , LM4843 , LM4843MH , LM4844 , LM4845 , LM4849 , LM4849MH , LM4850 , LM4850LD , LM4850MM , LM4850MT , LM4851 , LM48510 , LM48511 , LM48512 , LM4851IBL , LM4851ITL , LM4851LQ , LM4852 , LM4852 , LM48520 , LM4852ITL , LM4852LQ , LM4853 , LM4853 , LM4853LD , LM4853LD , LM4853MM , LM4853MM , LM4853MMX , LM4854 , LM4854IBL , LM4855 , LM48555 , LM48556 , LM48557 , LM4855IBL , LM4855ITL , LM4855LQ , LM4856 , LM48560 , LM4857 , LM4857GR , LM4857ITL , LM4857SP , LM4858 , LM48580 , LM48580 , LM4859 , LM4860 , LM4860M , LM4861 , LM4861M , LM4862 , LM4862 , LM4862M , LM4862N , LM4863 , LM4863 , LM4863M , LM4863MT , LM4863MTE , LM4863N , LM4864 , LM4864M , LM4864MM , LM4864N , LM4865 , LM4865M , LM4865MM , LM4866 , LM4866LQ , LM4866MT , LM4866MTE , LM4867 , LM4867LQ , LM4867MT , LM4867MTE , LM4868 , LM4868LQ , LM4868MT , LM4868MTE , LM4870 , LM4870M , LM4871 , LM4871M , LM4871N , LM4872 , LM4872IBP , LM4872IBPX , LM4873 , LM4873MT , LM4873MTE , LM4873MTE-1 , LM4874 , LM4874MH , LM4875 , LM4875M , LM4875MM , LM4876 , LM4876M , LM4877 , LM4877IBP , LM4877IBPX , LM4878 , LM4878IBP , LM4878IBPX , LM4880 , LM4880 , LM4880M , LM4880N , LM4881 , LM4881M , LM4881MM , LM4881N , LM4882 , LM48820 , LM48822 , LM48823 , LM48824 , LM4882M , LM4882MM , LM4883 , LM4883-SQ_BOM-001A , LM4883SQ , LM48860 , LM48861 , LM4888 , LM4889 , LM4890 , LM4890 , LM48903 , LM4890IBL , LM4890IBLX , LM4890IBP , LM4890IBPX , LM4890ITL , LM4890ITLX , LM4890LD , LM4890M , LM4890MM , LM4893 , LM4893ITL , LM4893ITLX , LM4893MA , LM4893MM , LM4894 , LM4894IBP , LM4894ITL , LM4894ITLX , LM4894LD , LM4894MM , LM4895 , LM4895IBP , LM4895LD , LM4895MM , LM4897 , LM4897MM , LM4898 , LM4898ITL , LM4898ITLX , LM4898LD , LM4898MM , LM4899 , LM4899ITL , LM4899ITLX , LM4899LD , LM4899MM , LM4900 , LM4900LD , LM4900M , LM4900MM , LM4901 , LM4901 , LM4902 , LM4902LD , LM4902MM , LM4903 , LM4903MM , LM4904 , LM4905 , LM4905LD , LM4905LQ , LM4905MM , LM4906 , LM4906LD , LM4906MM , LM4908 , LM4910 , LM49100 , LM49101 , LM4910LQ , LM4910MA , LM4910MM , LM4911 , LM4911MM , LM4912 , LM4912MM , LM4913 , LM4913MH , LM4913MM , LM4914 , LM4914MH , LM4915 , LM49150 , LM49151 , LM49155 , LM4916 , LM4916LD , LM4916MM , LM4917 , LM4917MT , LM4917SD , LM4918 , LM4918LQ , LM4919 , LM4919MM , LM4920 , LM4921 , LM4921 , LM4922 , LM4923 , LM4923 , LM4923LQ , LM4923LQBD , LM4924 , LM4925 , LM49250 , LM4926 , LM4927 , LM49270 , LM4928 , LM4929 , LM4929MM , LM4930 , LM4930ITL , LM4931 , LM49321 , LM4934 , LM4935 , LM49350 , LM49352 , LM4936 , LM4937 , LM49370 , LM4938 , LM494 , LM4940 , LM4940 , LM4940 , LM4940 , LM4941 , LM4946 , LM4947 , LM4949 , LM494CJ , LM494CN , LM494IN , LM4950 , LM4950TA , LM4950TS , LM4951 , LM4951A , LM4952 , LM4953 , LM4953 , LM4954 , LM4960 , LM4960SQ , LM4961 , LM4961LQ , LM4970 , LM4970 , LM4980 , LM4981 , LM4982 , LM4985 , LM4990 , LM4990ITL , LM4990ITLX , LM4990LD , LM4990MH , LM4990MM , LM4991 , LM4991LD , LM4991MA , LM4992 , LM4992SD , LM4995 , LM4Q30TA ,

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