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DS1921G Datasheet(PDF) 29 Page - Maxim Integrated Products |
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DS1921G Datasheet(HTML) 29 Page - Maxim Integrated Products |
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29 / 42 page  Thermochron iButton ______________________________________________________________________________________ 29 DS1921G Tx PRESENCE PULSE MASTER Tx RESET PULSE MASTER Tx ROM FUNCTION COMMAND DS1921G Tx CRC BYTE *TO BE TRANSMITTED OR RECEIVED AT OVERDRIVE SPEED IF OD = 1. ** PRESENCE PULSE IS SHORT IF OD = 1. DS1921G Tx FAMILY CODE (1 BYTE) DS1921G Tx SERIAL NUMBER (6 BYTES) OD = 0 MASTER Tx BIT 0 Y SHORT RESET PULSE? Y Y Y Y Y Y N 33h READ ROM COMMAND? N 55h MATCH ROM COMMAND? BIT 0 MATCH? BIT 0 MATCH? N N N N N N N F0h SEARCH ROM COMMAND? N ECh CONDITIONAL SEARCH COMMAND? N Y MASTER Tx BIT 1 MASTER Tx BIT 63 BIT 1 MATCH? BIT 63 MATCH? Y Y FROM MEMORY/CONTROL FUNCTIONS FLOWCHART (FIGURE 10) TO MEMORY FUNCTIONS FLOWCHART (FIGURE 10) DS1921G Tx BIT 0 DS1921G Tx BIT 0 MASTER Tx BIT 0 BIT 1 MATCH? BIT 63 MATCH? DS1921G Tx BIT 1 DS1921G Tx BIT 1 MASTER Tx BIT 1 DS1921G Tx BIT 63 DS1921G Tx BIT 63 MASTER Tx BIT 63 Y BIT 0 MATCH? N N N Y Y DS1921G Tx BIT 0 DS1921G Tx BIT 0 MASTER Tx BIT 0 CONDITION MET? N Y BIT 1 MATCH? BIT 63 MATCH? DS1921G Tx BIT 1 DS1921G Tx BIT 1 MASTER Tx BIT 1 DS1921G Tx BIT 63 DS1921G Tx BIT 63 MASTER Tx BIT 63 Y FROM FIGURE 13b TO FIGURE 13b TO FIGURE 13b FROM FIGURE 13b * * * * * * * * * * * * * * * * ** * * * * * * * Figure 13a. ROM Functions Flowchart |
Similar Part No. - DS1921G |
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Similar Description - DS1921G |
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