MAX7370 datasheet(30/37 Pages) MAXIM

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MAX7370

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

with I2C Interface and High Level of ESD Protection

Table 24. GPIO Global Configuration Register (0x40)

Table 25. GPIO Debounce Configuration Register (0x42)

RESERVED

DEBOUNCE TIME

Power-up default setting

Debounce time is 9ms

Debounce time is 10ms

Debounce time is 11ms

Debounce time is 12ms

⋮

Debounce time is 37ms

Debounce time is 38ms

Debounce time is 39ms

Debounce time is 40ms

DESCRIPTION

VALUE

FUNCTION

DEFAULT VALUE

D[7:6]

Reserved

—

I2C timeout

interrupt enable

Disabled

INT is asserted when I2C bus times out. INT is

deasserted when a read is performed on the I2C

timeout flag register (0x48).

GPIO enable

PWM, constant-current circuits, and GPIs are

shut down. GPO values depend on their setting.

cannot be changed. The entire part is shut down

if the key switches are in sleep mode

(D7 of register 0x01).

Normal GPIO operation. PWM, constant-current

circuits, and GPIOs are enabled regardless of

key-switch sleep-mode state (see Table 8).

GPIO reset

Normal operation

Return all GPIO registers (registers 0x31 to 0x5B)

to their POR value. This bit is momentary and

resets itself to 0 after the write cycle.

D[2:0]

Fade-in/out time

000

No fading

000

XXX

PWM intensity ramps up (down) between the

common PWM value and 0% duty cycle in 16

steps over the following time period:

D[2:0] = 001 = 256ms

D[2:0] = 010 = 512ms

D[2:0] = 011 = 1024ms

D[2:0] = 100 = 2048ms

D[2:0] = 101 = 4096ms

D[2:0] = 110/111 = Undefined

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