Chapter 4 Technical Description
S5U13515P00C100 Evaluation Board User Manual (Rev 1.1)
EPSON
21
4.8 Keypad Interface
Note
The keyboard is non-operational with the buttons SW3-SW11, mounted as they are on the board. In order to make
the keyboard operational, the user must remove the buttons SW3-SW11 from the board and mount them back on
the board, but rotated by 90 degrees or 270 degrees. The buttons will not match the footprint on the PCB, but this is
how they must be mounted on the board.
The S2D13515 Display Controller can support up to a 5x5 matrix keypad, but the S5U13515P00C100 evaluation
board includes only a 3x3 keypad. The keypad interface can be configured to use either the FPIO1 interface or Host
interface pins. For S2D13515 pin mapping, refer to the
S2D13515 Hardware Functional Specification
, document
number X83A-A-001-xx. The keypad interface is configured for either the FPIO1 interface or Host Interface pins
using 0 ohm resistors.
Figure 4-6: Keypad Interface Zero Ohm Resistor Overview Diagram
The keypad can be configured to connect to 1 of 2 source pins on the S2D13515. Depending of the configuration,
the input lines must be pulled high to corresponding power supply. The source connection for the keypad is deter-
mined by populating the correct set of zero ohm resistors as described below.
S5U13515P00C100 evaluation board comes configured with the keyboard interface from the Host Interface pins,
so resistors R185 ~ R190 and R180 are populated and R191 ~ R196 and R181 are not populated.
Table 4-1: Keypad Zero Ohm Resistor Summary
Keypad Pin Function
Populate only 1 set of the zero ohm resistors below
Zero Ohm For FP1IO
Zero Ohm For Host Interface
KBR0
R191
R185
KBR1
R192
R186
KBR2
R193
R187
KBC0
R194
R188
KBC1
R195
R190
KBC2
R196
R189
Power
(HIOVDD or PIO1VDD)
R181
R180
S2D13515
Zero
Ohms
Zero
Ohms
3x3
M/R#, AB[20:19], AB[16:14]
FP1IO[23:20], FP1IO[16:15]
Keypad