Matrix Keyboard
PHYTEC Meßtechnik GmbH 2004 L-657e_0
67
16
Matrix Keyboard
The phyCORE-PXA255 is populated with a GPIO expander, which
can be used for the connection of a matrix keyboard. The signal lines
extend to connector X4 and are arranged in columns and rows. The
column outputs have an in-line resistance of 33R and the row inputs
have an RC combination with R=1 kOhm against VCC and
C = 100 nF against GND to prevent a possible signal bounce.
S S P
G P I O
E X P A N D E R
U 2
K E Y B O A R D
E G P I O 2 1 - 2 7
M A X 7 3 0 1
E G P I O 0 - 2 1
/ I N T ( E G P I O 2 7 )
F R A M
Figure 38:
Matric Keyboard Connection
Содержание phyCORE-PXA255
Страница 8: ...Development Board for phyCORE PXA255 PHYTEC Me technik GmbH 2004 L 657e_0...
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Страница 101: ...Appendices PHYTEC Me technik GmbH 2004 L 657e_0 93 Appendices A AI Hardware Revision...
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Страница 106: ...Published by PHYTEC Me technik GmbH 2004 Ordering No L 657e_0 Printed in Germany...