Manual of Board ET-TOUCH PAD 4x4 V2
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SHIFT HELP ENTER
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Details of each PIN
+VDD,GND = Interface Power Supply for Board that is either VDC 3.3V (for MCU 3.3V) or 5V (for MCU 5V)
BCD = This PIN sends Key Code 4BIT; PIN No.8 is Bit MSB. Key Code is sent out every time it pressed and
released Key. The Key Code that is sent out is value of the latest Key that is pressed or released and the value
still stands until any new Key is pressed.
T#/R = Touch/Release notifies status of pressing/release any Key. When pressing any Key, Logic becomes 0 and the
Logic 0 still stands until the Key is released. On the other hand, when any Key is released or it does not press
any Key, this Pin becomes Logic 1 and the Logic 1 still stands until it presses any new Key and this Pin
becomes Logic 0 again.
SHIF# = This SHIFT notifies status of Key when pressing/releasing Key F together with another key (Key-F + another
key) (it refers to the Key position in the figure 2.2 above. Key-F is setup as mutual Key). Normally, this PIN is
Logic 1; when it presses the mutual Key that presses Key F together with another key (Key F + another key),
this PIN becomes Logic 0 and the Logic 0 still remains until both Keys are released and this PIN becomes Logic
1 again (When pressing the mutual Key, it has to press and hold Key F for a while and then press another Key).
If using single Key, it can read status of pressing/releasing Key from PIN T#/R only. If using single Key and mutual Key together, it
has to read status of pressing/releasing Key from PIN T#/R and SHIF#.
-11. LOAD-FW : It upgrades Firmware for ET-TOUCH PAD 4x4 V2 (normally, it has to return to ETT to upgrade Firmware).
-12. CON-Touch PAD2 : This Connector 20PIN is connected to Board TOUCH-PAD to receive signal touching from user.
NOTE: It has to choose only one type of reading Key Code that is either ASCII Code or Binary Code because it has to choose only
one Connector type correctly. If reading Key Code as ASCII Code, it has to choose Connector RS232(3) or TTL232(7); or, if reading Key
Code as Binary BCD8421, it has to choose Connector O/P BCD Key Code(10).
In the part of Power Supply (+VDD,GND) for Board, user can choose only one Connector to interface signal, it is either
Connector RS232(3) or TTL(7) or O/P BCD Key Code (10).
3. How to perform and read Key Code of ET-TOUCH PAD 4x4 V2
Generally, when supplied power into Board completely, LED Status Key flashes on and off regularly according to Beep sound.
Status of PIN BCD is Logic 0 while Pin T#/R and SHIF# is Logic 1. For Connector 232, it does not send out any data. When pressing and
still holding any Key that is not Key F, or pressing Key F together with another Key (Key F + another Key) and still holding, other
remaining Keys are locked and user cannot press any key; in this case, it has to release all keys that are pressed and finally, user can press
any key as required. Every time user presses any Key once, it produces Beep sound one time; LED of the pressed Key will be lit up and it is
still ON until the pressed Key is released. After released keys, it turns off LED. Or, Key is pressed and held more than 20 seconds, it also
turns off LED because it resumes the touching system as normal.
When any Key is pressed or released, Output Key Codes that are Binary Code and ASCII Code, including Signal T#/R will be
updated according to status of the latest Key that is pressed/released. It means that whatever Key is pressed or released, it always sends out
Key Code; moreover, it always changes status of Signal T #/R. For the status of Signal SHIF#, it is updated or changed when pressed or
released Key F together with another Key (SHIF# changes its status when using 2 Keys at the same time).
For Buzzer and LED Status Key, it normally enables the operation by Enable Jumper JP-BZ and JP-LED. If user does not want to
use any part, please remove Jumper of the unwanted device and then Power-On Board again.
