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LM95245CIMMX bảng dữ liệu(PDF) 11 Page - Texas Instruments |
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LM95245CIMMX bảng dữ liệu(HTML) 11 Page - Texas Instruments |
11 / 36 page 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 Submit Documentation Feedback 11 Product Folder Links: LM95245 |
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