MAX7370 Maxim, MAX7370 Datasheet - Page 30

• Manufacturer Part Number: MAX7370
• Description: The MAX7370 I²C-interfaced peripheral provides microprocessors with management of up to 64 key switches, with optional GPIO and PWM-controlled LED drivers
• Manufacturer: Maxim

with I
Table 24. GPIO Global Configuration Register (0x40)
Table 25. GPIO Debounce Configuration Register (0x42)
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
REGISTER BIT
8 x 8 Key-Switch Controller and LED Driver/GPIOs
D[7:6]
D[2:0]
D5
D4
D3
REGISTER DESCRIPTION
2
C Interface and High Level of ESD Protection
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Fade-in/out time
interrupt enable
DESCRIPTION
GPIO enable
I
GPIO reset
2
Reserved
C timeout
VALUE
XXX
000
0
0
1
0
1
0
1
D7
0
0
0
0
0
0
0
0
RESERVED
—
Disabled
INT is asserted when I
deasserted when a read is performed on the I
timeout flag register (0x48).
PWM, constant-current circuits, and GPIs are
shut down. GPO values depend on their setting.
Register 0x31 to 0x5B values are stored and
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).
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.
No fading
PWM intensity ramps up (down) between the
common PWM value and 0% duty cycle in 16
steps over the following time period:
D6
0
0
0
0
0
0
0
0
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
⋮
D5
0
0
0
0
0
0
0
0
FUNCTION
REGISTER DATA
2
C bus times out. INT is
D4
0
0
0
0
1
1
1
1
D3
0
0
0
0
1
1
1
1
DEBOUNCE TIME
D2
2
0
0
0
0
1
1
1
1
C
MAX7370
DEFAULT VALUE
D1
0
0
1
1
0
0
1
1
000
00
0
0
0
D0
0
1
0
1
0
1
0
1