PT6584 Datasheet, PDF (18/42 Pages) Princeton Technology Corp – LCD Driver IC

LCD Driver IC
Key Input 1
Key Input 2
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Fax:[phone]
URL:http://www.princeton.com.tw
PT6584
Key scan
80 0T[s]
CE
Se rial da ta tra nsfe r Se rial da ta tra nsfe r Ke y ad dre ss (43 H)
DI
80 0T[s]
Se rial da ta tra nsfe r
80 0T[s]
Ke y ad dre ss
Ke y ad dre ss
DO
Ke y da ta r ead
Ke y da ta r ead re que st
Ke y da ta r ead
Ke y da ta r ead re que st
Ke y da ta r ead
Ke y da ta r ead re que st
T
=
1
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.
• If a key is pressed for longer than 800T(s)(Where T= ¹ ) 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