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MAX11041 Datasheet(PDF) 14 Page - Maxim Integrated Products |
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MAX11041 Datasheet(HTML) 14 Page - Maxim Integrated Products |
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14 / 17 page  Figure 10. Power-Up, Jack Detect, and Keypress Example 1 23 45 6 7 89 10 11 12 DATA ENTERED RESET DATA (POR) TIME TIME VINT VSENSE t1 t2 t3 t4 t5 t6 WRITE POINTER READ POINTER SHDN TRANSITION FROM LOW TO HIGH. 1 WRITE POINTER READ POINTER OPEN CIRCUIT DETECTED AND ENTERED IN FIFO. DURATION TIMER STARTS. 2 WRITE POINTER READ POINTER JACK INSERTION DETECTED AND ENTERED IN FIFO. FINAL DURATION TIME FROM 2 IS STORED. NEW DURATION TIME FOR JACK DETECTION STARTS. 3 WRITE POINTER READ POINTER JACK REMOVAL DETECTED (OPEN CIRCUIT) AND STORED IN FIFO. FINAL DURATION TIME FROM 3 IS STORED. NEW DURATION TIME FOR OPEN CIRCUIT STARTS. 4 0xFF 0xFF 0xFF 0xFF 0xFF 0x00 0x00 0x00 0xFF 0x00 0x00 0x00 0xFF 0x00 0xFF 0x00 0xFF 0xFF 0xFF 0xFF 0xFF 0x00 TIMER... 0x00 0xFF 0x00 0x00 0x00 0xFF 0x00 0xFF 0x00 0xFF JD CODE 0xFF 0xFF 0xFF TIMER... t1/32ms 0x00 0xFF 0x00 0x00 0x00 0xFF 0x00 0xFF 0x00 0xFF JD CODE 0xFF 0xFF 0xFF t1/32ms TIMER... 0xFF 0x00 0x00 0x00 0xFF 0x00 0xFF 0x00 t2/32ms JACK INSERTION DETECTED AND ENTERED IN FIFO. FINAL DURATION TIME FROM 4 IS STORED. NEW DURATION TIME FOR JACK DETECTION STARTS. 5 µP READS UNTIL FIFO EMPTY FLAG IS REACHED. FURTHER READS RESULT IN JD CODE AND CURRENT TIME DURATION OF JD CODE BEING SENT. 6 KEY PRESS DETECTED AND ENTERED IN FIFO. FINAL TIME DURATION FROM 6 IS STORED. NEW DURATION TIME FOR KEYPRESS STARTS. 7 µP READS UNTIL FIFO EMPTY FLAG IS REACHED. FURTHER READS RESULT IN KEY_ CODE AND CURRENT TIME DURATION OF KEY_ CODE BEING SENT. 8 WRITE POINTER READ POINTER 0xFF JD CODE 0xFF 0xFF t1/32ms TIMER... 0xFF 0x00 0x00 0xFF 0x00 0xFF 0x00 t2/32ms t3/32ms JD CODE WRITE POINTER READ POINTER 0xFF 0xFF 0xFF TIMER... 0xFF 0x00 0x00 0xFF 0x00 0xFF 0x00 JD CODE 0xFF 0x00 0x00 0x00 WRITE POINTER READ POINTER 0xFF 0xFF 0xFF TIMER... 0xFF 0x00 0x00 0xFF 0x00 JD CODE 0xFF 0x00 0x00 0x00 t4/32ms KEY_ CODE WRITE POINTER READ POINTER 0xFF 0xFF 0xFF TIMER... 0xFF 0x00 0x00 0xFF 0x00 0xFF 0x00 0x00 0x00 KEY_ CODE 0xFF 0x00 KEY RELEASE DETECTED (JD CODE) AND ENTERED IN FIFO. FINAL DURATION TIME FROM 8 IS STORED. NEW DURATION TIME FOR JD CODE STARTS. 9 µP READS UNTIL FIFO EMPTY FLAG IS REACHED. FURTHER READS RESULT IN JD CODE AND CURRENT TIME DURATION OF JD CODE BEING SENT. 10 11 12 JACK REMOVAL DETECTED (OPEN CIRCUIT) AND STORED IN FIFO. FINAL DURATION TIME FROM 10 IS STORED. NEW DURATION TIME FOR OPEN CIRCUIT STARTS. µP READS UNTIL FIFO EMPTY FLAG IS REACHED. FURTHER READS RESULT IN 0xFF AND CURRENT TIME DURATION BEING SENT. WRITE POINTER READ POINTER WRITE POINTER READ POINTER WRITE POINTER READ POINTER WRITE POINTER READ POINTER 0xFF 0xFF TIMER... 0xFF 0x00 0xFF 0x00 0xFF 0x00 0x00 0x00 KEY_ CODE 0xFF 0x00 t5/32ms JD CODE 0xFF 0xFF TIMER... 0xFF 0x00 0xFF 0x00 0xFF 0x00 0x00 0x00 0xFF 0x00 JD CODE 0xFF 0x00 0xFF 0xFF TIMER... 0xFF 0x00 0x00 0x00 0x00 0xFF 0xFF 0x00 JD CODE 0xFF t6/32ms 0xFF 0xFF TIMER... 0xFF 0xFF 0x00 0x00 0x00 0x00 0xFF 0xFF 0x00 0xFF 0x00 0x00 0xFF *BOTH POINTERS WRAP AROUND TO THE TOP WHEN THEY GET TO THE END OF FIFO. 0xFF 0x00 * Wired Remote Controller 14 ______________________________________________________________________________________ |
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