MAX7370 datasheet(20/37 Pages) MAXIM

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�� Maxim Integrated Products 20

MAX7370

8 x 8 Key-Switch Controller and LED Driver/GPIOs

with I2C Interface and High Level of ESD Protection

Table 7. Keys FIFO Register Format (0x00)

SPECIAL FUNCTION

KEYS FIFO REGISTER DATA

The key number indicated by

D[5:0] is a key event. D7 is

always for a keypress of key 62

and key 63. When D7 is 0, the

key read is the last data in the

FIFO. When D7 is 1, there is

more data in the FIFO. When D6

is 1, key data read from the FIFO

is a key release. When D6 is 0,

key data read from the FIFO is a

keypress.

FIFO not-

empty flag

Key-

release

flag

Key number/key event

FIFO is empty.

FIFO is overflow. Continue to

read data in the FIFO.

Key 63 is pressed. Read one

more time to determine whether

there is more data in the FIFO.

Key 63 is released. Read one

more time to determine whether

there is more data in the FIFO.

Key repeat. Indicates the last

data in the FIFO.

Key repeat. Indicates more data

in the FIFO.

Key 62 is pressed. Read one

more time to determine whether

there is more data in the FIFO.

Key 62 is released. Read one

more time to determine whether

there is more data in the FIFO.

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