phyCORE-OMAP44xx
Part II: PCM-959/phyCORE-OMAP44xx Carrier Board
L-760e_1 © PHYTEC Messtechnik GmbH 2012
143
6
X_KPD_ROW1
I
1.8 V
Keyboard row 1
7
X_KPD_COL2
O
VCC_1V8_IO
Keyboard column 2 (open drain)
8
X_KPD_ROW2
I
1.8 V
Keyboard row 2
9
X_KPD_COL3
O
VCC_1V8_IO
Keyboard column 3 (open drain)
10
X_KPD_ROW3
I
1.8 V
Keyboard row 3
11
X_KPD_COL4_CSI21_DX3
O/I
VCC_1V8_IO / CSI
Keyboard column 4 (open drain)
/ CSI2-A (CSI21) differential
data lane positive input 3
(see note below)
12
X_KPD_ROW4_CSI21_DY3
I
1.8 V / CSI
Keyboard row 4 / CSI2-A (CSI21)
differential data lane negative
input 3 (see note below)
13
X_KPD_COL5_CSI21_DX4
O/I
VCC_1V8_IO / CSI
Keyboard column 5 (open drain)
/ CSI2-A (CSI21) differential
data lane positive input 4
(see note below)
14
X_KPD_ROW5_CSI21_DY4
I
1.8 V / CSI
Keyboard row 5 / CSI2-A (CSI21)
differential data lane negative
input 4 (see note below)
15, 16
GND
-
-
Ground
Note:
Contacts 10 to 13 of the keypad connector provide either signals of the keyboard interface, or camera lanes 3
and 4 of the primary camera interface. The resistor array JN1 on the phyCORE-OMAP44xx allows to choose
which signals are brought out at these pins. The default setting of JN1 at position 1 allows to use the keyboard
interface without changes. Please refer to
Caution:
When using the keypad connector (X21) with a smaller keypad (for example, 4 × 4), unused rows must be tied
high (e.g. by connecting the corresponding pins to contact 1 (VCC_1V8_IO) of connector X21) to prevent
disturbing the scanning process. Normally, all rows must be pulled up internally at the I/O cells of the device.
Location
Signal
I/O
SL
Description
Table 69:
Keypad Connector (X21) Signal Mapping
