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IGEPv2 BOARD HARDWARE USER MANUAL v1.20
ISEE 2007 SL. All rights reserved, IGEP® is a registered trademark from ISEE 2007 SL. The following is
provided for informational purposes only.
DOCUMENT FROM ISEE 2007 S.L. MAN-PR-IGEP.0020-001.20.HW_RC 10/1/2010
38
Figure 34 J971 location
The schematic below illustrate the pin out of the connector.
Figure 35 Schematic J971
KPD_Cx: columns
KPD_Rx: rows
When a key button of the keyboard matrix is pressed the corresponding row and
column lines are shorted together. To allow key press detection, all input pins
(KBR) are pulled up to VCC and all output pins (KBC) driven to a low level.
Any action on a button generates an interrupt to the sequencer.
The decoding sequence is written to allow detection of simultaneous press actions
on several key buttons.