Rainbow Electronics MAX7360 User Manual
Page 20
I
2
C-Interfaced Key-Switch Controller and LED
Driver/GPIOs with Integrated ESD Protection
MAX7360
20 _____________________________________________________________________________________
Table 8. Configuration Register Format (0x01)
Table 9. Debounce Register Format (0x02)
REGISTER
BIT
DESCRIPTION
VALUE
FUNCTION
DEFAULT
VALUE
D7
Sleep
X
(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, autowakeup, or an I
2
C write to this bit.
0
0
(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), I
2
C write,
autosleep, and autowakeup all can change
this bit. This bit can be read back by I
2
C
any time for current status.
1
(when 0x40
D4 = 0)
Key-switch operating
mode
D6
Reserved
0
—
0
D5
Interrupt
0
INTK cleared when FIFO is empty
0
1
INTK cleared after host read. In this mode, I
2
C should read the
FIFO until interrupt condition is removed or further INT may be lost.
D4
Reserved
0
—
0
D3
Key-release
enable
0
Disable key releases
1
1
Enable key releases
D2
Reserved
0
—
0
D1
Autowakeup
enable
0
Disable keypress wakeup
1
1
Enable keypress wakeup
D0
Timeout
disable
0
I
2
C timeout enabled
0
1
I
2
C timeout disabled
REGISTER DESCRIPTION
REGISTER DATA
D7
D6
D5
D4
D3
D2
D1
D0
PORTS ENABLE
DEBOUNCE TIME
Debounce time is 9ms
X
X
X
0
0
0
0
0
Debounce time is 10ms
X
X
X
0
0
0
0
1
Debounce time is 11ms
X
X
X
0
0
0
1
0
Debounce time is 12ms
X
X
X
0
0
0
1
1
.
.
.
Debounce time is 37ms
X
X
X
1
1
1
0
0
Debounce time is 38ms
X
X
X
1
1
1
0
1
Debounce time is 39ms
X
X
X
1
1
1
1
0
Debounce time is 40ms
X
X
X
1
1
1
1
1
GPO ports disabled (full key-scan functionality)
0
0
0
X
X
X
X
X
GPO port 7 enabled
0
0
1
X
X
X
X
X
GPO ports 7 and 6 enabled
0
1
0
X
X
X
X
X