MAX7370 datasheet(21/37 Pages) MAXIM

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�� Maxim Integrated Products 21

MAX7370

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

with I2C Interface and High Level of ESD Protection

Table 8. Configuration Register (0x01)

X = Don’t care.

BIT

DESCRIPTION

VALUE

FUNCTION

DEFAULT

VALUE

Sleep

(when 0x40

D4 = 1)

Key-switch operating mode. Key switches always remain active

when constant-current PWM is enabled (bit 4 of register 0x40 is

high), regardless of autosleep, autowake, or an I2C write to this bit.

(when 0x40

D4 = 0)

Key-switch sleep

mode. The entire

chip is shut down.

When constant-current PWM is disabled

(bit 4 of register 0x40 is low), I2C write,

autosleep, and autowake all can change

this bit. This bit can be read back by I2C

any time for current status.

(when 0x40

D4 = 0)

Key-switch operating

mode.

Reserved

—

Interrupt

INT cleared when the FIFO is empty.

INT cleared after host read. In this mode, I2C should read the

FIFO until interrupt condition is removed or further INT could be

lost.

Reserved

—

Key-release

enable

Disable key releases.

Enable key releases.

Reserved

—

Autowake

enable

Disable keypress wakeup.

Enable keypress wakeup.

Timeout

disable

I2C timeout enabled.

I2C timeout disabled.

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