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PDF LM95235 Data sheet ( Hoja de datos )
| Número de pieza | LM95235 | |
| Descripción | Precision Remote Diode Temperature Sensor with SMBus Interface and TruTherm Technology | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM95235 (archivo pdf) en la parte inferior de esta página. Total 25 Páginas | ||
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www.DataSheet4U.com
May 2006
LM95235
Precision Remote Diode Temperature Sensor with
SMBus Interface and TruTherm™ Technology
General Description
The LM95235 is an 11-bit digital temperature sensor with a
2-wire System Management Bus (SMBus) interface and Tru-
Therm technology that can monitor the temperature of a
remote diode as well as its own temperature. The LM95235
can be used to very accurately monitor the temperature of
n Two Formats: −128˚C to +127.875˚C and 0˚C to 255˚C
n Digital filter for remote channel
n Programmable TCRIT and OS thresholds
n Programmable shared hysteresis register
n Diode Fault Detection
n Mask, Offset, and Status Registers
external devices such as microprocessors, graphics proces-
sors, or a diode-connected MMBT3904 transistor. TruTherm
technology allows the LM95235 to precisely monitor thermal
diodes found in 90 nm and smaller geometry processes.
LM95235 reports temperature in two different formats for
+127.875˚C/-128˚C range and 0˚C/255˚C range. The
LM95235 T_CRIT and OS outputs are asserted when either
unmasked channel exceeds its programmed limit and can be
n SMBus 2.0 compatible interface, supports TIMEOUT
n Programmable conversion rate for best power
consumption
n Three-level address pin
n Standby mode one-shot conversion control
n Pin-for-pin compatible with the LM86/LM89
n 8-pin MSOP package
used to shutdown the system, to turn on the system fans, or
as a microcontroller interrupt function. The current status of
Key Specifications
the T_CRIT and OS pins can be read back from the status
registers via the SMBus interface. All limits have a shared
programmable hysteresis register.
j Supply Voltage
j Supply Current, Conv. Rate = 1 Hz
3.0 V to 3.6 V
350 µA (typ)
The remote temperature channel of the LM95235 has a j Remote Diode Temperature Accuracy
programmable digital filter. The LM95235 contains a diode
TA = 25˚C to 85˚C; TD = 60˚C to 100˚C
model selection bit to select between a typical Intel® proces-
sor on a 65 nm or 90 nm process or MMBT39w04w, aws w.Delal atsaSheTeAt4= U25.˚cCotmo 85˚C; TD = 40˚C to 120˚C
an offset register for maximum flexibility and best accuracy. j Local Temperature Accuracy
±0.75˚C (max)
±1.5˚C (max)
The LM95235 has a three-level address pin to connect up to
3 devices to the same SMBus master, that is shared with the
OS output. The LM95235 has a programmable conversion
TA = 25˚C to 100˚C
j Conversion Rate, Both Channels
±2.0˚C (max)
16 to 0.4 Hz
rate register and a standby mode to save power. One con-
version can be triggered in standby mode by writing to the Applications
one-shot register.
Features
n Processor/Computer System Thermal Management
(e.g. Laptops, Desktops, Workstations, Servers)
n Electronic Test Equipment
n Remote and Local temperature channels
n Office Electronics
n Diode Model Selection Bit - MMBT3904 or 65/90 nm
processor diodes
Connection Diagram
MSOP-8
TOP VIEW
20174902
TruTherm™ is a trademark of National Semiconductor Corporation.
Intel® is a registered trademark of Intel Corporation.
Pentium® is a registered trademark of Intel Corporation.
Intel® Core™ Duo is a trademark of Intel Corporation.
Intel® Core™ Solo is a trademark of Intel Corporation.
© 2006 National Semiconductor Corporation DS201749
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1 page  
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Logic Electrical Characteristics
Digital DC Characteristics
Unless otherwise noted, these specifications apply for VDD= +3.0 Vdc to 3.6 Vdc. Boldface limits apply for TA = TJ = TMIN to
TMAX; all other limits TA= TJ= +25˚C, unless otherwise noted.
Symbol
Parameter
Conditions Typical
Limits
Units
(Note 6)
(Note 7)
(Limit)
SMBDAT, SMBCLK INPUTS
VIN(1)
Logical “1” Input Voltage
2.1 V (min)
VIN(0)
Logical “0” Input Voltage
0.8 V (max)
VIN(HYST)
SMBDAT and SMBCLK Digital Input Hysteresis
400
mV
IIN(1)
Logical “1” Input Current
VIN = VDD
−0.005
−10
µA (max)
IIN(0)
Logical “0” Input Current
VIN = 0 V
0.005
+10 µA (max)
CIN Input Capacitance
5 pF
A0 DIGITAL INPUT
VIH Input High Voltage
VIM Input Middle Voltage
VIL Input Low Voltage
IIN(1)
Logical “1” Input Current
IIN(0)
Logical “0” Input Current
CIN Input Capacitance
SMBDAT, T_CRIT, OS DIGITAL OUTPUTS
VIN = VDD
VIN = 0 V
−0.005
0.005
5
0.90 x VDD
0.57 x VDD
0.43 x VDD
0.10 x VDD
−10
+10
V (min)
V (max)
V (min)
V (max)
µA (max)
µA (max)
pF
IOH
VOL(T_CRIT, OS)
VOL(SMBDAT)
COUT
High Level Output Leakage Current
VOUT = VDD
T_CRIT, OS Low Level Output Voltage
IOL = 6 mA
SMBDAT Low Level Output Voltage
IOL = 4 mA
IOL = 6 mA
Digital Output Capacitance
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5
10 µA (max)
0.4 V (max)
0.4 V (max)
0.6 V (max)
pF
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1.0 Functional Description (Continued)
Temperature
+25˚C
+1˚C
+0.125˚C
0˚C
Digital Output
Binary
0001 1001 0000 0000
0000 0001 0000 0000
0000 0000 0010 0000
0000 0000 0000 0000
Hex
1900h
0100h
0020h
0000h
13-bit, 2’s complement (12-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
20174927
FIGURE 3. Digital Filter Response in a typical Intel
processor on a 65 nm or 90 nm process. The filter
curves were purposely offset for clarity.
+0.03125˚C
0˚C
−0.03125˚C
−1˚C
−25˚C
0000 0000 0000 1000
0000 0000 0000 0000
1111 1111 1111 1000
1111 1111 0000 0000
1110 0111 0000 0000
0008h
0000h
FFF8h
FF00h
E700h
1.5 TEMPERATURE DATA FORMAT
−55˚C
1100 1001 0000 0000
C900h
Temperature data can only be read from the Local and
Remote Temperature registers.
13-bit, unsigned binary
Remote temperature data with the digital filter off is repre-
sented by an 10-bit plus sign, two’s complement word and
11-bit unsigned binary word with an LSb (Least Significant
Bit) equal to 0.125˚C. The data format is a left justified 16-bit
word available in two 8-bit registers. Unused bits report "0".
Temperature
+255.875˚C
+255˚C
Digital Output
Binary
Hex
1111 1111 1110 0000
FFE0h
1111 1111 0000 0000
FF00h
Remote temperature data with the digital filter on is repre-
+201˚C
sented by a 12-bit plus sign, two’s complement wwordwawnd.DataShee+t142U5˚.Ccom
13-bit unsigned binary word with an LSb (Least Significant
Bit) equal to 0.03125˚C (1/32˚C). The data format is a left
+25˚C
justified 16-bit word available in two 8-bit registers. Unused
+1˚C
bits report "0".
+0.03125˚C
1100 1001 0000 0000
0111 1101 0000 0000
0001 1001 0000 0000
0000 0001 0000 0000
0000 0000 0000 1000
C900h
7D00h
1900h
0100h
0008h
11-bit, 2’s complement (10-bit plus sign)
Temperature
+125˚C
+25˚C
+1˚C
+0.125˚C
Digital Output
Binary
0111 1101 0000 0000
0001 1001 0000 0000
0000 0001 0000 0000
0000 0000 0010 0000
Hex
7D00h
1900h
0100h
0020h
0˚C
0000 0000 0000 0000
0000h
Local Temperature data is represented by a 10-bit plus sign,
two’s complement word with an LSb (Least Significant Bit)
equal to 0.125˚C. The data format is a left justified 16-bit
word available in two 8-bit registers. Unused bits will always
report "0". Local temperature readings greater than
+127.875˚C are clamped to +127.875˚C, they will not roll-
over to negative temperature readings.
0˚C
0000 0000 0000 0000
0000h
11-bit, 2’s complement (10-bit plus sign)
−0.125˚C
−1˚C
−25˚C
−55˚C
1111 1111 1110 0000
1111 1111 0000 0000
1110 0111 0000 0000
1100 1001 0000 0000
FFE0h
FF00h
E700h
C900h
Temperature
+125˚C
+25˚C
Digital Output
Binary
0111 1101 0000 0000
0001 1001 0000 0000
Hex
7D00h
1900h
11-bit, unsigned binary
Temperature
+255.875˚C
+255˚C
+201˚C
+125˚C
Digital Output
Binary
Hex
1111 1111 1110 0000
FFE0h
1111 1111 0000 0000
FF00h
1100 1001 0000 0000
C900h
0111 1101 0000 0000
7D00h
+1˚C
+0.125˚C
0˚C
−0.125˚C
−1˚C
−25˚C
−55˚C
0000 0001 0000 0000
0000 0000 0010 0000
0000 0000 0000 0000
1111 1111 1110 0000
1111 1111 0000 0000
1110 0111 0000 0000
1100 1001 0000 0000
0100h
0020h
0000h
FFE0h
FF00h
E700h
C900h
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| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet LM95235.PDF ] | |
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