PT6553_10 Datasheet, PDF (18/41 Pages) Princeton Technology Corp – LCD Driver IC with Key Input Function

LCD Driver IC with Key Input Function
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URL: http://www.princeton.com.tw
PT6553
Key input
(KO6 line)
Key scan
CE
615T(s)
615T(s)
Serial data transfer
DI
Serial data transfer
Key address (43H) Serial data transfer Key address
DO
Key data read
Key data read
Key data read request
Key data read request
T = 1/fosc
MULTIPLE KEY OPERATION
For dual key operation, triple key operation on the KI1 to KI5 input lines, or multiple key operation on
the KO1 to KO6 output lines do not to connect an external diode. Other multiple key operation other
than those stated may result in erroneous key press recognition. Therefore, to avoid this from
happening, a diode must be inserted in series with each key. Applications that do not recognize
multiple (3 or more) key operation should check the key data for three or more bits and ignore such
data.
PT6553 V1.7
- 18 -
November, 2007