CAP1133 datasheet(47/63 Pages) MICROCHIP

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DS00001625B-page 47

CAP1133

6.36

LED Duty Cycle Registers

The LED Duty Cycle registers determine the minimum and maximum duty cycle settings used for the LED for each LED

behavior. These settings affect the brightness of the LED when it is fully off and fully on.

The LED driver duty cycle will ramp up from the minimum duty cycle to the maximum duty cycle and back down again.

APPLICATION NOTE: When operating in Direct behavior mode, changes to the Duty Cycle settings will be applied

immediately. When operating in Breathe, Pulse 1, or Pulse 2 modes, the LED must be

unactuated and then re-actuated before changes to behavior are processed.

Bits 7 - 4 - X_MAX_DUTY[3:0] - Determines the maximum PWM duty cycle for the LED drivers as shown in Table 6-60.

Bits 3 - 0 - X_MIN_DUTY[3:0] - Determines the minimum PWM duty cycle for the LED drivers as shown in Table 6-60.

6.37

LED Direct Ramp Rates Register

TABLE 6-59:

LED DUTY CYCLE REGISTERS

ADDR

R/W

Default

90h

R/W

LED Pulse 1 Duty

Cycle

P1_MAX_DUTY[3:0]

P1_MIN_DUTY[3:0]

F0h

91h

R/W

LED Pulse 2 Duty

Cycle

P2_MAX_DUTY[3:0]

P2_MIN_DUTY[3:0]

F0h

92h

R/W

LED Breathe

Duty Cycle

BR_MAX_DUTY[3:0]

BR_MIN_DUTY[3:0]

F0h

93h

R/W

Direct Duty Cycle

DR_MAX_DUTY[3:0]

DR_MIN_DUTY[3:0]

F0h

TABLE 6-60:

LED DUTY CYCLE DECODE

x_MAX/MIN_Duty [3:0]

Maximum Duty Cycle

Minimum Duty Cycle

11%

14%

11%

17%

14%

20%

17%

23%

20%

26%

23%

30%

26%

35%

30%

40%

35%

46%

40%

53%

46%

63%

53%

77%

63%

100%

77%

TABLE 6-61:

LED DIRECT RAMP RATES REGISTER

ADDR

R/W

Default

94h

R/W

LED Direct Ramp

Rates

RISE_RATE[2:0]

FALL_RATE[2:0]

00h

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