ADP5586ACBZ-03-R7 datasheet(11/44 Pages) AD

11 / 44 page

Data Sheet

ADP5586

Rev. 0 | Page 11 of 44

LOGIC EVENT

I/O CONFIGURATION

KEY EVENT

GPI EVENT

I2C BUSY?

R1 R2

R4 R5*

C0 C1 C2 C3 C4

PIN_CONFIG_A[7:0]

PIN_CONFIG_B[7:0]

FIFO

PIN_CONFIG_C[7:0]

EVENT_INT

OVRFLOW_INT

EC[4:0]

RESET_TRIG_TIME[3:0]

RESET_EVENT_A[7:0]

RESET_EVENT_B[7:0]

RESET_EVENT_C[7:0]

RESET_INITIATE

FIFO

UPDATE

KEY SCAN

CONTROL

COLUMN

SINK ON/OFF

ROW

SENSE

*R5 AVAILABLE ON ADP5586ACBZ-01-R7 ONLY.

Figure 10. Detailed Key Scan Block

Figure 10 shows a detailed representation of the key scan block

and its associated control and status signals. When all row and

column pins are used, a matrix of 25 unique keys can be scanned.

Use the PIN_CONFIG_A[5:0] and PIN_CONFIG_B[4:0] registers

(Register 0x3A and Register 0x3B, respectively) to configure the

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 25 key identifiers on the FIFO.

If a smaller 2 × 2 matrix is configured, for example, by using the

C2 and C3 column pins and the R1 and R2 row pins, only four

event identifiers (8, 9, 13, and 14) can possibly be observed on

the FIFO, as shown in Figure 10.

By default, the ADP5586 records key presses and releases on the

FIFO. Figure 11 illustrates what happens when a single key is

pressed and released. Initially, the key scanner is idle. When Key 3

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 3 has remained pressed, which sets the EVENT_INT interrupt

bit (Register 0x01, Bit 0). The event counter, EC[4:0] (Register 0x02,

Bits[4:0]), is then incremented to 1; EVENT1_IDENTIFIER[6:0]

of the FIFO is updated with its event identifier set to 3; and its

EVENT1_STATE bit is set to 1, indicating a key press.

KEY 3

KEY 3 PRESS

KEY 3 RELEASE

KEY SCAN

EVENT_INT

EC[4:0]

FIFO

Figure 11. 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_IDENTIFIER[6:0]

of the FIFO is updated with its event identifier set to 3. The

EVENT2_STATE bit is set to 0, indicating a release. The key

scanner returns to idle mode because no other keys are pressed.

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