MAX7370 Maxim, MAX7370 Datasheet - Page 32

• 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 29. COL4–COL7 Individual PWM Ratio Registers (0x50 to 0x53)
Table 30. COL4–COL7 LED Configuration Registers (0x54 to 0x57)
Power-up default setting
PORT PWM ratio is 0/256
PORT PWM ratio is 1/256
PORT PWM ratio is 2/256
PORT PWM ratio is 3/256
PORT PWM ratio is 252/256
PORT PWM ratio is 253/256
PORT PWM ratio is 254/256
PORT PWM ratio is 256/256 (100% duty cycle)
REGISTER BIT
8 x 8 Key-Switch Controller and LED Driver/GPIOs
D[7:6]
D[4:2]
D[1:0]
D5
2
C Interface and High Level of ESD Protection
REGISTER DESCRIPTION
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DESCRIPTION
Common PWM
Blink-on time
Blink period
Don’t care
110/111
VALUE
000
001
010
011
100
101
00
00
01
10
11
0
1
—
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
D7
⋮
0
0
0
0
1
1
1
1
D6
0
0
0
0
1
1
1
1
FUNCTION
D5
0
0
0
0
1
1
1
1
REGISTER DATA
PORT PWM
D4
0
0
0
0
1
1
1
1
D3
0
0
0
0
1
1
1
1
MAX7370
D2
0
0
0
0
1
1
1
1
DEFAULT VALUE
D1
0
0
1
1
0
0
1
1
000
00
00
0
D0
0
1
0
1
0
1
0
1