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LM95231 Datasheet(PDF) 14 Page - Texas Instruments |
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LM95231 Datasheet(HTML) 14 Page - Texas Instruments |
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14 / 30 page  D7 D6 D5 D4 D3 D2 D1 D0 1 9 1 9 Ack by LM95231 Start by Master Repeat Start by Master R/W Frame 1 Serial Bus Address Byte Frame 2 Command Byte Ack by LM95231 D7 D6 D5 D4 D3 D2 D1 D0 1 9 1 9 Ack by LM95231 R/W Frame 3 Serial Bus Address Byte Frame 4 Data Byte from the LM95231 No Ack by Master Stop by Master SMBCLK SMBDAT SMBCLK (Continued) SMBDAT (Continued) A5 A3 A2 A0 A6 A4 A1 A5 A3 A2 A0 A6 A4 A1 D7 D6 D5 D4 D3 D2 D1 D0 1 9 1 9 Ack by LM95231 Start by Master R/W Frame 1 Serial Bus Address Byte Frame 2 Data Byte from the LM95231 NoAck by Master SMBCLK SMBDAT Stop by Master A5 A3 A2 A0 A6 A4 A1 D7 D6 D5 D4 D3 D2 D1 D0 1 9 1 9 Ack by LM95231 Start by Master R/W Frame 1 Serial Bus Address Byte Frame 2 Command Byte Ack by LM95231 D7 D6 D5 D4 D3 D2 D1 D0 1 9 Frame 3 Data Byte Ack by LM95231 Stop by Master SMBCLK SMBDAT SMBCLK (Continued) SMBDAT (Continued) A5 A3 A2 A0 A6 A4 A1 LM95231 SNIS139E – FEBRUARY 2005 – REVISED MARCH 2013 www.ti.com Figure 8. Serial Bus Write to the internal Command Register followed by a Data Byte Figure 9. Serial Bus byte Read from a Register with the internal Command Register preset to desired value. (d) Serial Bus Write followed by a Repeat Start and Immediate Read Figure 10. SMBus Timing Diagrams for Access of Data SERIAL INTERFACE RESET In the event that the SMBus Master is RESET while the LM95231 is transmitting on the SMBDAT line, the LM95231 must be returned to a known state in the communication protocol. This may be done in one of two ways: 1. When SMBDAT is LOW, the LM95231 SMBus state machine resets to the SMBus idle state if either SMBDAT or SMBCLK are held low for more than 35ms (tTIMEOUT). Note that according to SMBus specification 2.0 all devices are to timeout when either the SMBCLK or SMBDAT lines are held low for 25- 35ms. Therefore, to insure a timeout of all devices on the bus the SMBCLK or SMBDAT lines must be held low for at least 35ms. 14 Submit Documentation Feedback Copyright © 2005–2013, Texas Instruments Incorporated Product Folder Links: LM95231 |
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