Support Information
3.9External Keypad Connector
Connector P5 is the ADS External Keypad connector. Figure
VCC 1 UART2_RXD 3 UART2_TXD 5 KP_COL5 7 KP_COL4 9 KP_COL3 11 KP_COL2 13 KP_COL1 15 KP_COL0 17 NC 19
P5 |
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| NC |
• | • | 2 | |
• | • | 4 | UART2_RTS |
• | • | 6 | UART2_CTS |
• | • | 8 | KP_ROW5 |
• | • | 10 | KP_ROW4 |
• | • | 12 | KP_ROW3 |
• | • | 14 | KP_ROW2 |
• | • | 16 | KP_ROW1 |
• | • | 18 | KP_ROW0 |
• | • | 20 | GND |
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Figure 3-13. External Keypad Connector P5 Pin Assignments
Table 3-13. External Keypad Connector P5 Signal Descriptions
Pin(s) | Signal | Description |
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1 | VCC | +3 volt power |
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2, 19 | NC | NO CONNECTION |
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3 | UART2_RXD KEY_COL7 | KEYPAD COLUMN 7 — Bidirectional signal used to scan a keypad |
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4 | UART2_RTS KEY_ROW6 | KEYPAD ROW 6 — Bidirectional signal used to scan a keypad |
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5 | UART2_TXD KEY_COL6 | KEYPAD COLUMN 6 — Bidirectional signal used to scan a keypad |
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6 | UART2_CTS KEY_ROW7 | KEYPAD ROW 7 — Bidirectional signal used to scan a keypad |
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7 | KP_COL5 | KEYPAD COLUMN 5 — Bidirectional signal used to scan a keypad |
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8 | KP_ROW5 | KEYPAD ROW 5 — Bidirectional signal used to scan a keypad |
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9 | KP_COL4 | KEYPAD COLUMN 4 — Bidirectional signal used to scan a keypad |
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10 | KP_ROW4 | KEYPAD ROW 4 — Bidirectional signal used to scan a keypad |
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11 | KP_COL3 | KEYPAD COLUMN 3 — Bidirectional signal used to scan a keypad |
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12 | KP_ROW3 | KEYPAD ROW 3 — Bidirectional signal used to scan a keypad |
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13 | KP_COL2 | KEYPAD COLUMN 2 — Bidirectional signal used to scan a keypad |
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14 | KP_ROW2 | KEYPAD ROW 2 — Bidirectional signal used to scan a keypad |
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15 | KP_COL1 | KEYPAD COLUMN 1 — Bidirectional signal used to scan a keypad |
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16 | KP_ROW1 | KEYPAD ROW 1 — Bidirectional signal used to scan a keypad |
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17 | KP_COL0 | KEYPAD COLUMN 0 — Bidirectional signal used to scan a keypad |
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18 | KP_ROW0 | KEYPAD ROW 0 — Bidirectional signal used to scan a keypad |
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20 | GND | GROUND |
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*The signal name in italics is the function intended for operation with this connector. It is multiplexed in the i.MX21 processor with the listed signal.
| M9328MX21ADSE User’s Manual, Rev. A |
Freescale Semiconductor |
