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PDF LM95213 Data sheet ( Hoja de datos )
| Número de pieza | LM95213 | |
| Descripción | 2-Diode Input and Local Digital Temperature Sensor | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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www.DataSheet4U.com
March 2007
LM95213
2-Diode Input and Local Digital Temperature Sensor with
Two-Wire Interface and TCRIT Outputs
General Description
LM95213 is an 11-bit digital temperature sensor with a 2-wire
System Management Bus (SMBus) interface that can monitor
the temperature of two remote diodes as well as its own tem-
perature. The LM95213 can be used to very accurately mon-
itor the temperature of up to two external devices such as
microprocessors, graphics processors or diode-connected
2N3904s.
The LM95213 reports temperature in two different formats for
+127.875°C/–128°C range and 0°C/255°C range. The
LM95213 TCRIT1, TCRIT2 and TCRIT3 outputs are triggered
when any unmasked channel exceeds its corresponding pro-
grammable limit and can be used to shutdown the system, to
turn on the system fans or as a microcontroller interrupt func-
tion. The current status of the TCRIT1, TCRIT2 and TCRIT3
pins can be read back from the status registers. Mask regis-
ters are available for further control of the TCRIT outputs.
LM95213's remote temperature channels have pro-
grammable digital filters to minimize unwanted TCRIT events
when temperature spikes are encountered.
For optimum flexibility and accuracy each LM95213 channel
includes offset correction registers for targeting diodes other
than the 2N3904. A three level address pin allows connection
of up to 3 LM95213s to the same SMBus master. The
LM95213 includes power saving functions such as: pro-
grammable conversion rate, shutdown mode, and turn off of
unused channels.
Features
■ Accurately senses die temperature of 2 remote ICs or
diode junctions and local temperature
■ 0.125°C LSb temperature resolution
■ 0.03125°C LSb remote temperature resolution with digital
filter enabled
■ +127.875°C/–128°C and 0°C/255°C remote ranges
■ Programmable digital filters and analog front end filter
■ Remote diode fault detection, model selection and offset
correction
■ Mask and status register support
■ 3 programmable TCRIT outputs with programmable
shared hysteresis
■ Programmable conversion rate and shutdown mode one-
shot conversion control
■ SMBus 2.0 compatible interface, supports TIMEOUT
■ Three-level address pin
■ 14-pin LLP package
Key Specifications
■ Local Temperature Accuracy
±2.0 °C (max)
■ Remote Diode Temperature Accuracy ±1.1 °C (max)
■ Supply Voltage
3.0 V to 3.6 V
■ Average Supply Current (1Hz
0.57 mA (typ)
conversion rate)
Applications
■ Processor/Computer System Thermal Management
(e.g. Laptop, Desktop, Workstations, Server)
■ Electronic Test Equipment
■ Office Electronics
Connection Diagram
LLP-14
TruTherm™ is a trademark of National Semiconductor Corporation.
Intel™ is a trademark of Intel Corporation.
Pentium™ is a trademark of Intel Corporation.
© 2007 National Semiconductor Corporation 300138
TOP VIEW
30013801
www.national.com
1 page  
Absolute Maximum Ratings (Note 1)
Supply Voltage
−0.3V to 6.0V
Voltage at SMBDAT, SMBCLK,
TCRIT1, TCRIT2, TCRIT3
−0.5V to 6.0V
Voltage at Other Pins
D− Input Current
−0.3V to (VDD + 0.3V)
±1 mA
Input Current at All Other Pins (Note 2)
±5 mA
Package Input Current (Note 2)
30 mA
SMBDAT, TCRIT1, TCRIT2,
TCRIT3 Output Sink Current
10 mA
Storage Temperature
−65°C to +150°C
ESD Susceptibility (Note 4)
Human Body Model
2000V
Machine Model
200V
Charge Device Model
1000V
Soldering process must comply with National’s reflow
temperature profile specifications. Refer to http://
www.national.com/packaging/. (Note 3)
Operating Ratings
(Notes 1, 5)
Operating Temperature Range
Electrical Characteristics Temperature
Range
LM95213CISD
Supply Voltage Range (VDD)
−40°C to +140°C
TMIN ≤ TA ≤ TMAX
−40°C ≤ TA ≤
+125°C
+3.0V to +3.6V
Temperature-to-Digital Converter Electrical Characteristics
Unless otherwise noted, these specifications apply for VDD = +3.0Vdc to 3.6Vdc. Boldface limits apply for TA = TJ = TMIN ≤ TA
≤ TMAX; all other limits TA = TJ = +25°C, unless otherwise noted.
Parameter
Conditions
Typical
Limits
Units
(Note 6) (Note 7)
(Limit)
Temperature Error Using Local Diode
Temperature Error Using Remote Diode (Note
9)
Local Diode Measurement Resolution
TA = -40°C to +125°C, (Note 8)
TA = +25°C to +85°C
TD = +60°C to +100°C
MMBT3904
Transistor
TA = +25°C to +85°C
TD = −40°C to +125°C
MMBT3904
Transistor
TA = −40°C to +85°C
TD = −40°C to +125°C
MMBT3904
Transistor
TA = −40°C to +85°C
TD = 125°C to +140°C
MMBT3904
Transistor
±1
11
±2
±1.1
±1.3
±3.0
±3.3
°C (max)
°C (max)
°C (max)
°C (max)
°C (max)
Bits
0.125
°C
Remote Diode Measurement Resolution
Digital Filter Off
11 Bits
0.125
°C
Digital Filter On (Remote Diodes 1 and 2
13
only)
0.03125
Bits
°C
Conversion Time of All Temperatures at the
Fastest Setting (Note 11)
All Channels are Enabled in Default
State
1100
1210
ms (max)
1 External Channel
31 34 ms (max)
Local only
30 33 ms (max)
Quiescent Current (Note 10)
SMBus Inactive, 1Hz Conversion Rate,
channels in default state
570
800 µA (max)
Shutdown
360 µA
D− Source Voltage
0.4 V
Remote Diode Source Current
High level
160 230 µA (max)
Low level
10
Power-On Reset Threshold
Measured on VDD input, falling edge
2.8 V (max)
1.6 V (min)
TCRIT1 Pin Temperature Threshold
Default Diodes only
+110
°C
TCRIT2 Pin Temperature Threshold
Default all channels
+85
°C
5 www.national.com
5 Page 
A0 Pin State
Low
Mid-Supply
High
SMBus Device Address A[6:0]
Hex Binary
18h 001 1000
2Ah 010 1010
2Bh 010 1011
1.4 TEMPERATURE CONVERSION SEQUENCE
Each of the 3 temperature channels of LM95213 can be
turned OFF independent from each other via the Channel
Enable Register. Turning off unused channels will increase
the conversion speed in the fastest conversion speed mode.
If the slower conversion speed settings are used, disabling
unused channels will reduce the average power consumption
of LM95213.
1.5 DIGITAL FILTER
In order to suppress erroneous remote temperature readings
due to noise as well as increase the resolution of the temper-
ature, the LM95213 incorporates a digital filter for Remote 1
and 2 Temperature Channels. When a filter is enabled the
filtered readings are used for the TCRIT comparisons. There
are two possible digital filter settings that are enabled through
the Filter Setting Register at register address 0Fh. The filter
for each channel can be set according to the following table:
R1F[1:0] or R2F[1:0]
00
01
10
11
Filter Setting
No Filter
Filter (equivalent to Level 2
filter of the LM86/LM89)
Reserved
Enhanced Filter (Filter with
transient noise clipping)
Figure 2 describes the filter output in response to a step input
and an impulse input.
30013825
a) Seventeen and fifty degree step
response
30013826
b) Impulse response with input
transients less than 4°C
30013827
c) Impulse response with input
transients great than 4°C
FIGURE 2. Filter Impulse and Step Response Curves
30013828
FIGURE 3. Digital Filter Response in a typical processor
system. The filter curves were purposely offset for
clarity.
Figure 3 shows the filter in use in a typical processor system.
Note that the two curves have been purposely offset for clar-
ity. Inserting the filter does not induce an offset as shown.
1.6 TEMPERATURE DATA FORMAT
Temperature data can only be read from the Local and Re-
mote Temperature value registers. The data format for all
temperature values is left justified 16-bit word available in two
8-bit registers. Unused bits will always report "0". All temper-
ature data is clamped and will not roll over when a tempera-
ture exceeds full-scale value.
Remote temperature data for all channels can be represented
by an 11-bit, two's complement word or unsigned binary word
with an LSb (Least Significant Bit) equal to 0.125°C.
11-bit, 2's complement (10-bit plus sign)
Temperature
Digital Output
Binary
Hex
+125°C
0111 1101 0000 0000
7D00h
+25°C
0001 1001 0000 0000
1900h
+1°C
0000 0001 0000 0000
0100h
+0.125°C
0000 0000 0010 0000
0020h
0°C
0000 0000 0000 0000
0000h
−0.125°C
1111 1111 1110 0000
FFE0h
−1°C
1111 1111 0000 0000
FF00h
11 www.national.com
11 Page | ||
| Páginas | Total 34 Páginas | |
| PDF Descargar | [ Datasheet LM95213.PDF ] | |
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