Phytec phyCORE-OMAP44 Series, Hardware Manual

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Part I: PCM-049/phyCORE-OMAP44xx System on Module phyCORE-OMAP44xx
70 ©
PHYTEC Messtechnik GmbH
2012
L-760e_1
1.13 Keyboard Interface
The keyboard interface of the phyCORE-OMAP44xx can handle up to 6 x 6 keys. It supports features like
debouncing, wake-up event generation, multikey-press detection, programmable interrupt generation and
much more.
Table 36 shows the location of the keyboard signals on the phyCORE-Connector.
Pin # Signal I/O SL Description
X1A1 X_KPD_COL0 O VCC_1V8_IO Keyboard column 0
(open drain)
X1B1 X_KPD_COL1 O VCC_1V8_IO Keyboard column 1
(open drain)
X1B2 X_KPD_COL2 O VCC_1V8_IO Keyboard column 2
(open drain)
X1A3 X_KPD_COL3 O VCC_1V8_IO Keyboard column 3
(open drain)
X1B3 X_KPD_ROW0 I 1.8 V Keyboard row 0
X1A4 X_KPD_ROW1 I 1.8 V Keyboard row 1
X1A5 X_KPD_ROW2 I 1.8 V Keyboard row 2
X1A6 X_KPD_ROW3 I 1.8 V Keyboard row 3
X1B5 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)
X1B6 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)
X1B7 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)
X1B8 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)
Table 36: Keyboard Interface Signal Location
Note:
Pins X1B5 to X1B8 on the phyCORE-Connector provide either signals of the keyboard interface, or camera
lanes 3 and 4 of the primary camera interface. The resistor array JN1 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
Table 6 for more information on JN1.