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LM95245CIMMX bảng dữ liệu(PDF) 11 Page - Texas Instruments

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LM95245
www.ti.com
SNIS148G – OCTOBER 2007 – REVISED MARCH 2013
SMBus INTERFACE
The LM95245 operates as a slave on the SMBus, so the SMBCLK line is an input and the SMBDAT line is
bidirectional. The LM95245 never drives the SMBCLK line and it does not support clock stretching. According to
SMBus specifications, the LM95245 has a 7-bit slave address. Three SMBus addresses can be selected by
connecting pin 6 (A0) to either Low, Mid-Supply or High voltages. The address selection table below shows two
sets of possible selections for the LM95245CIMM and the LM95245CIMM-1.
LM95245CIMM SMBus Device
LM95245CIMM-1 SMBus
Address
Device Address
State of the A0 Pin
HEX
Binary
HEX
Binary
Low
18
001 1000
19
001 1001
Mid-Supply
29
010 1001
29
010 1001
High
4C
100 1100
4D
100 1100
The OS/A0 pin, after power-up, defaults as an address select input pin (A0). After power-up, the OS/A0 pin can
only be programmed as an OS output when it is in the “High” state. Therefore, 4Ch is the only valid slave
address that can be used when the OS/A0 pin is programmed to function as an OS output. When the OS/A0 pin
is programmed to function as an A0 input the LM95245 will immediately detect the state of this pin to determine
its SMBus slave address. The LM95245 does not latch the state of the A0 pin when it is functioning as an input.
If the OS/A0 pin is not used it must be externally connected through hardware to some state, as shown in the
table, in order to guarantee that the proper address is selected and not in an indeterminate state. The OS/A0
does not have an internal pull-up.
DIGITAL FILTER
In order to suppress erroneous remote temperature readings due to noise, the LM95245 incorporates a digital
filter for the Remote Temperature Channel. The filter is accessed in the Configuration Register 2, bits D2 (FE1)
and D1(FE0). The filter can be set according to the following table.
FE1
FE0
Filter Setting
0
0
Filter Off
0
1
Reserved
1
0
Reserved
1
1
Filter On
Filter Impulse and Step Response Curves depicts the filter output in response to a step input and an impulse
input.
Filter Impulse and Step Response Curves
Figure 8. Seventeen and Fifty Degree Step
Figure 9. Impulse Response with Input Transients
Response
Less Than 4°C
Copyright © 2007–2013, Texas Instruments Incorporated
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