
Part II: PCM-959/phyCORE-OMAP44xx Carrier Board
phyCORE-OMAP44xx
142
©
PHYTEC Messtechnik GmbH
2012
L-760e_1
2.1.3.20 Keypad Connector (X21)
Figure 46:
Keypad Connector X21
The 2.00 mm socket connector X21 provides access to the OMAP44xx keyboard controller signals (kpd).
shows a detailed view of the location of the keypad connector. When referencing contact numbers
note that contact 1 is located at the angled corner. Contacts towards the pin header connector X19 are even
numbered while contacts towards the labeling "Keypad" are odd numbered.
The keypad connector supports multiconfiguration keypads with up to 6 rows x 6 columns (up to 36 keys).
The reference voltage VCC_1V8_IO and the supply voltage VCC_3V3 are also available at the keypad connector.
The following table describes the signal mapping at X21
Location
Signal
I/O
SL
Description
1
VCC_1V8_IO
O
VCC_1V8_IO
1.8 V IO reference voltage
2
VCC_3V3
O
VCC_3V3
3.3 V supply voltage
3
X_KPD_COL0
O
VCC_1V8_IO
Keyboard column 0 (open drain)
4
X_KPD_ROW0
I
1.8 V
Keyboard row 0
5
X_KPD_COL1
O
VCC_1V8_IO
Keyboard column 1 (open drain)
Table 69:
Keypad Connector (X21) Signal Mapping