ADP5589ACPZ-00-R7 datasheet(11/52 Pages) AD

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Data Sheet

ADP5589

Rev. B | Page 11 of 52

LOGIC EVENT

789

FIFO

UPDATE

KEY SCAN

CONTROL

I/O CONFIGURATION

KEY EVENT

GPI EVENT

I2C BUSY?

R1 R2

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]

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

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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