MAX7304 Datasheet, PDF (24/28 Pages) Maxim Integrated Products – I2C-Interfaced 16-Port, Level-Translating GPIO and LED Driver with High Level of Integrated

MAX7304
I²C-Interfaced 16-Port,
Level-Translating GPIO and LED Driver
with High Level of Integrated ESD Protection
Table 20. I²C Timeout Flag Register (0x48) (Read Only)
REGISTER BIT
D[7:1]
D0
DESCRIPTION
Reserved
I²C timeout flag
VALUE
0000000
0
1
FUNCTION
—
No I²C timeout has occurred since last read or POR.
I²C timeout has occurred since last read or POR. This
bit is reset to zero when a read is performed on this
register. I²C timeouts must be enabled for this function
to work (see Table 5).
DEFAULT VALUE
0000000
0
Table 21. PORT12–PORT15 Individual PWM Ratio Registers (0x50 to 0x53)
REGISTER DATA
REGISTER DESCRIPTION
D7
D6
D5
D4
D3
D2
D1
D0
PORT PWM
Power-up default setting
PORT PWM ratio is 0/256
0
0
0
0
0
0
0
0
PORT PWM ratio is 1/256
0
0
0
0
0
0
0
1
PORT PWM ratio is 2/256
0
0
0
0
0
0
1
0
PORT PWM ratio is 3/256
0
0
0
0
0
0
1
1
⋮
PORT PWM ratio is 252/256
1
1
1
1
1
1
0
0
PORT PWM ratio is 253/256
1
1
1
1
1
1
0
1
PORT PWM ratio is 254/256
1
1
1
1
1
1
1
0
PORT PWM ratio is 256/256
(100% duty cycle)
1
1
1
1
1
1
1
1
Table 22. PORT12–PORT15 LED Configuration Registers (0x54 to 0x57)
REGISTER BIT
D[7:6]
D5
D[4:2]
D[1:0]
DESCRIPTION
Don’t care
Common PWM
Blink period
Blink-on time
VALUE
00
0
1
000
001
010
011
100
101
110/111
00
01
10
11
FUNCTION
—
Port uses individual PWM intensity register to set the
PWM ratio
Port uses common PWM intensity register to set the
PWM ratio
Port does not blink
Port blink period is 256ms
Port blink period is 512ms
Port blink period is 1024ms
Port blink period is 2048ms
Port blink period is 4096ms
Undefined
LED is on for 50% of the blink period
LED is on for 25% of the blink period
LED is on for 12.5% of the blink period
LED is on for 6.25% of the blink period
DEFAULT VALUE
00
0
000
00
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