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DS1921G Datasheet(PDF) 22 Page - Maxim Integrated Products |
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DS1921G Datasheet(HTML) 22 Page - Maxim Integrated Products |
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22 / 42 page  Thermochron iButton 22 ______________________________________________________________________________________ MASTER Tx MEMORY OR CONTROL FUNCTION COMMAND DS1921G SETS EMCLR = 0 MASTER Tx DATA BYTE TO SCRATCHPAD OFFSET DS1921G INCREMENTS SCRATCHPAD OFFSET DS1921G SETS SCRATCHPAD OFFSET = [T4:T0] AND CLEARS (PF, AA) 0Fh WRITE SCRATCHPAD? N Y Y N Y N N Y N MASTER Tx RESET? SCRATCHPAD OFFSET = 11111b? MASTER Tx RESET? MASTER Tx RESET? MASTER Tx TA1 [T7:T0], TA2 [T15:T8] DS1921G SETS [E4:E0] = SCRATCHPAD OFFSET N FROM ROM FUNCTIONS FLOWCHART (FIGURE 13) TO ROM FUNCTIONS FLOWCHART (FIGURE 13) Y Y TO FIGURE 10b FROM FIGURE 10b MASTER Rx CRC-16 OF COMMAND, ADDRESS, DATA MASTER Rx "1"s PARTIAL BYTE WRITTEN? PF = 1 AA = 1 DS1921G SETS EMCLR = 0 DS1921G SETS SCRATCHPAD OFFSET = [T4:T0] DS1921G INCREMENTS SCRATCHPAD OFFSET MASTER Rx ENDING OFFSET WITH DATA STATUS (E/S) AAh READ SCRATCHPAD? N Y Y N Y N Y N MASTER Tx RESET? SCRATCHPAD OFFSET = 11111b? MASTER Tx RESET? MASTER Rx TA1 [T7:T0], TA2 [T15:T8] MASTER Rx DATA BYTE FROM SCRATCHPAD OFFSET MASTER Rx CRC-16 OF COMMAND, ADDRESS, DATA, E/S BYTE, AND DATA STARTING AT THE TARGET ADDRESS MASTER Rx "1"s 55h COPY SCRATCHPAD N Y Y N N MASTER Tx RESET? MASTER Tx RESET? COPYING FINISHED MASTER Tx TA1 [T7:T0], TA2 [T15:T8] DS1921G SETS EMCLR = 0 MASTER Tx E/S BYTE DS1921G COPIES SCRATCHPAD DATA TO MEMORY N Y N Y Y N MASTER Tx RESET? Y AUTHORIZATION CODE MATCH? DS1921G Tx "0" DS1921G Tx "1" MASTER Rx "1"s MASTER Rx "1"s Figure 10a. Memory/Control Function Flowchart |
Similar Part No. - DS1921G_11 |
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Similar Description - DS1921G_11 |
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