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LM95235 Datasheet(PDF) 10 Page - National Semiconductor (TI) |
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LM95235 Datasheet(HTML) 10 Page - National Semiconductor (TI) |
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10 / 25 page  1.0 Functional Description (Continued) 7. Remote TCRIT limit default is 6Eh (110 ˚C). 8. Remote Offset High and Low bytes default to 00h. 9. Configuration Register 1 defaults to 00h. This sets the LM95235 as follows: A. The STOP/RUN defaults to the active/converting mode. B. The Local and Remote TCRIT and OS Masks are reset to 0. 10. Configuration Register 2 defaults to 1Fh. This sets the LM95235 as follows: A. Remote Diode digital filter defaults on. B. The Remote Diode mode defaults to a typical Intel processor on 65/90 nm process. C. Diode Fault Mask bit for TCRIT defaults to 1. D. Diode Fault Mask bit for OS defaults to 0. E. Pin 6 Function defaults to Address Input function (A0). 1.3 SMBus INTERFACE The LM95235 operates as a slave on the SMBus, so the SMBCLK line is an input and the SMBDAT line is bidirec- tional. The LM95235 never drives the SMBCLK line and it does not support clock stretching. According to SMBus specifications, the LM95235 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 the possible selections. State of the A0 Pin SMBus Device Address HEX Binary Low 18 001 1000 Mid-Supply 29 010 1001 High 4C 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 func- tion as an A0 input the LM95235 will immediately detect the state of this pin to determine its SMBus slave address. The LM95235 does not latch the state of the A0 pin when it is functioning as an input. 1.4 DIGITAL FILTER In order to suppress erroneous remote temperature readings due to noise, the LM95235 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 Figure 2 depicts the filter output in response to a step input and an impulse input. Figure 3 shows the filter in use in a typical Intel processor on a 65/90 nm process system. Note that the two curves have been purposely offset for clarity. Inserting the filter does not induce an offset as shown. 20174925 a) Seventeen and fifty degree step response 20174926 b) Impulse response with input transients less than 4˚C 20174928 c) Impuse response with input transients greater than 4˚C FIGURE 2. Filter Impulse and Step Response Curves www.national.com 10 |
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