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LCD Driver IC
PT6584
Key Input 1
Key Input 2
Key scan
CE
800T[s]
800T[s]
800T[s]
Serial data transfer
Serial data transfer
Key address
Key address (43H)
Serial data transfer
Key address
DI
DO
Key data read
Key data r ead
Key data read request
Key data r ead
1
Key data read request
Key data read request
T =
fosc
IN SLEEP MODE
• The pins KS1 to KS6 are set to high or low by the S0 and S1 bits in the control data. (See the
control data description for details.)
• If a key on one of the lines corresponding to a KS1 to KS6 pin which is set high is pressed, the
oscillator on the OSC pin is started and a key scan is performed. Keys are scanned until all keys
are released. Multiple key presses are recognized by determining whether multiple key data bits
are set.
1
• If a key is pressed for longer than 800T(s)(Where T=
) the PT6584 outputs a key data read
fosc
request (a low level on DO) to the controller. The controller acknowledges this request and reads
the key data. However, if CE is high during a serial data transfer, DO will be set high.
• After the controller reads the key data, the key data read request is cleared (DO is set high) and the
PT6584 performs another key scan. However, this does not clear sleep mode. Also note that DO,
being an open-drain output, requires a pull-up resistor (between 1 and 10KΩ).
• Sleep mode key scan example
PT6584 V1.1
- 18 -
August, 2006
PTC [ PRINCETON TECHNOLOGY CORP ]
