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CAT9554AYI-GT2 Datasheet(PDF) 11 Page - ON Semiconductor |
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CAT9554AYI-GT2 Datasheet(HTML) 11 Page - ON Semiconductor |
11 / 16 page CAT9554, CAT9554A © 2008 SCILLC. All rights reserved 11 Doc. No. MD-9002, Rev. F Characteristics subject to change without notice POWER-ON RESET OPERATION When the power supply is applied to VCC pin, an internal power-on reset pulse holds the CAT9554/9554A in a reset state until VCC reaches VPOR level. At this point, the reset condition is released and the internal state machine and the CAT9554/9554A registers are initialized to their default state. Figure 11. Read from Register Figure 12. Read Input Port Register DATA S 0 100 A2 A0 0 A A1 0 1 0 0 A2 A1 A0 A DATA A acknowledge from master acknowledge from slave R/W slave address slave address data from register COMMAND BYTE AS 1 acknowledge from slave acknowledge from slave R/W At this moment master-transmitter becomes master-receiver and slave-receiver becomes slave-transmitter NA no acknowledge from master data from register P last byte first byte 12 3 4 5 6 7 8 9 SCL SDA READ FROM PORT DATA INTO PORT S 010 0 A2 A0 1 A A1 A DATA 4 NA P no acknowledge from master acknowledge from master acknowledge from slave R/W slave address data from port start condition stop condition DATA 2 tPS tPH DATA 3 DATA 4 DATA 1 data from port tIV tIR INT DATA 1 |
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