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ADP5589ACBZ-02-R7 Datasheet(PDF) 11 Page - Analog Devices |
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ADP5589ACBZ-02-R7 Datasheet(HTML) 11 Page - Analog Devices |
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11 / 52 page  Data Sheet ADP5589 Rev. B | Page 11 of 52 LOGIC EVENT 56 789 10 11 4 3 2 1 16 17 18 19 20 21 22 15 14 13 12 27 28 29 30 31 32 33 26 25 24 23 38 39 40 41 42 43 44 37 36 35 34 49 50 51 52 53 54 55 48 47 46 45 60 61 62 63 64 65 66 59 58 57 56 71 72 73 74 75 76 77 70 69 68 67 82 83 84 85 86 87 88 81 80 79 78 FIFO UPDATE KEY SCAN CONTROL I/O CONFIGURATION KEY EVENT GPI EVENT I2C BUSY? R0 R3 R1 R2 R4 R7 R5 R6 C0 C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 COLUMN SINK ON/OFF PIN_CONFIG_A[7:0] PIN_CONFIG_B[7:0] ROW SENSE FIFO PIN_CONFIG_C[2:0] UNLOCK1[7:0] UNLOCK2[7:0] EXT_LOCK_EVENT[7:0] UNLOCK_TIMER[2:0] INT_MASK_TIMER[4:0] LOCK_EN LOCK_STAT EVENT_INT OVRFLOW_INT LOCK_INT EC[4:0] RESET_TRIGGER_TIME[2:0] RESET1_EVENT_A[7:0] RESET1_EVENT_B[7:0] RESET1_EVENT_C[7:0] 89 91 96 95 94 90 93 92 RESET2_EVENT_A[7:0] RESET2_EVENT_B[7:0] RESET 1_INITIATE RESET 2_INITIATE Figure 11. Detailed Key Scan Block Use Registers PIN_CONFIG_A[7:0] (0x49), PIN_CONFIG_B[7:0] (0x4A), and PIN_CONFIG_C[2:0] (0x4B) to configure I/Os for keypad decoding. The number label on each key switch represents the event identifier that is recorded if that switch is pressed. If all row/column pins are configured, it is possible to observe all 88 key identifiers on the FIFO. If a smaller 3 × 3 matrix is configured, for example, using the C5, C6, and C7 column pins and the R1, R2, and R3 row pins, only the nine event identifiers (17, 18, 19, 28, 29, 30, 39, 40, and 41) can possibly be observed on the FIFO, as shown in Figure 11. By default, the ADP5589 records key presses and releases on the FIFO. Figure 12 illustrates what happens when a single key is pressed and released. Initially, the key scanner is idle. When Key 32 is pressed, the scanner begins scanning through all configured row/column pairs. After the scan wait time, the scanner again scans through all configured row/column pairs and detects that Key 32 has remained pressed, which sets the EVENT_INT interrupt. The event counter, EC[4:0], is incre- mented to 1, EVENT1[7:0] of the FIFO is updated with its event identifier set to 32, and its Event1_State bit is set to 1, indicating a press. KEY 32 KEY 32 PRESS KEY 32 RELEASE KEY SCAN EVENT_INT EC[4:0] FIFO 1 2 1 0 0 0 32 32 0 0 Figure 12. Press and Release Event The key scanner continues the scan/wait cycles while the key remains pressed. If the scanner detects that the key has been released for two consecutive scan cycles, the event counter EC[4:0] is incremented to 2, and EVENT2[7:0] of the FIFO is updated with its event identifier set to 32. Its Event2_State bit is set to 0, indicating a release. The key scanner goes back to idle mode because no other keys are pressed. The EVENT_INT interrupt can be triggered by both press and release key events. As shown in Figure 13, if Key 32 is pressed, EVENT_INT is asserted, EC[4:0] is updated, and the FIFO is updated. During the time that the key is still pressed, it is possible for the FIFO to be read, the event counter decremented to 0, and EVENT_INT cleared. When the key is finally released, EVENT_INT is asserted, the event counter incremented, and the FIFO updated with the release event information. |
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