Datasheet

MAX7370
8 x 8 Key-Switch Controller and LED Driver/GPIOs
with I2C Interface and High Level of ESD Protection
32Maxim Integrated
Table 29. COL4–COL7 Individual PWM Ratio Registers (0x50 to 0x53)
Table 30. COL4–COL7 LED Configuration Registers (0x54 to 0x57)
REGISTER DESCRIPTION
REGISTER DATA
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
REGISTER BIT DESCRIPTION VALUE FUNCTION DEFAULT VALUE
D[7:6] Don’t care 00 — 00
D5 Common PWM
0
Port uses individual PWM intensity register to set
the PWM ratio
0
1
Port uses common PWM intensity register to set
the PWM ratio
D[4:2] Blink period
000 Port does not blink
000
001 Port blink period is 256ms
010 Port blink period is 512ms
011 Port blink period is 1024ms
100 Port blink period is 2048ms
101 Port blink period is 4096ms
110/111 Undefined
D[1:0] Blink-on time
00 LED is on for 50% of the blink period
00
01 LED is on for 25% of the blink period
10 LED is on for 12.5% of the blink period
11 LED is on for 6.25% of the blink period