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EN6370B Datasheet(PDF) 22 Page - Sanyo Semicon Device

Part No. EN6370B
Description  LCD Display Driver with Key Input Function
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Manufacturer  SANYO [Sanyo Semicon Device]
Direct Link  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

EN6370B Datasheet(HTML) 22 Page - Sanyo Semicon Device

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LC75808W
No.6370-22/38
Key Scan Operation Functions
1. Key scan timing
The key scan period is 384T(s). To reliably determine the on/off state of the keys, the LC75808W scans the keys
twice and determines that a key has been pressed when the key data agrees. It outputs a key data read request (a low
level on DO) 800T(s) after starting a key scan. If the key data dose not agree and a key was pressed at that point, it
scans the keys again. Thus the LC75808W cannot detect a key press shorter than 800T(s).
Note: *3. Note that the high/low states of these pins are determined by the KC1 to KC6 bits in the control data, and
that key scan output signals are not output from pins that are set to low.
2. In normal mode
• The pins KS1 to KS6 are set to high or low by the KC1 to KC6 bits in the control data.
• If a key on one of the lines corresponding to a KS1 to KS6 pin which is set high is pressed, a key scan is started
and the 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=
) the LC75808W outputs a key data read 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 LC75808W
performs another key scan. Also note that DO, being an open-drain output, requires a pull-up resistor (between 1k
Ω
and 10k
Ω).
1
fOSC
800T [s ]
800T [s]
800T [s ]
Serial data
transfer
Serial data
transfer
Serial data
transfer
Key address(43H)
Key address
Key address
Key data read request
Key data read
Key data read
Key data read request
Key data read
Key data read request
A12912
Key input 1
Key input 2
Key scan
CE
DI
DO
fosc
1
T=
1
*3
*3
KS1
2
*3
*3
KS2
3* 3
*3
KS3
4* 3
*3
KS4
5
1
2
3
4
5* 3
*3
KS5
6
768T [s]
6
A12911
*3
*3
KS6
Key on
fosc
1
T=


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