ACT8846
Rev 4, 25-May-16
PWM LED DRIVERS
Table 7:
DUTY#[ ] PWM Frequency Setting
The GPIO3, the GPIO4, the GPIO5, and the GPIO6
are configured as PWM LED drivers, which could
support up to 6mA current with programmable
frequency and duty cycle. Set PWM#EN[ ] bit to “1”
to enable PWM function of GPIO#.
DUTY#[3:0]
0000
0001
0010
0011
PWM Duty Cycle [%]
6.25
12.5
18.75
25
PWM Frequence Selection
Each LED driver may be independently
programmed to a different frequency by writing to
the GPIO’s FRE[2:0] register via the I2C serial
interface as shown in Table 6.
0100
0101
0110
0111
31.25
37.5
43.75
50
Table 6:
FRE#[ ] PWM Frequency Setting
FRE#[2:0]
000
PWM Frequency [Hz]
1000
1001
1010
1011
56.25
62.5
68.75
75
0.25
0.5
1
001
010
011
2
1100
1101
1110
1111
81.25
87.5
93.75
100
100
128
256
101
PWM Duty Cycle Selection
Each LED driver may be independently
programmed to a different duty cycle by writing to
the GPIO’s DUTY[3:0] register via the I2C serial
interface as shown in Table 7.
Innovative PowerTM
- 38 -
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