CAP1128 datasheet(59/75 Pages) MICROCHIP

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 2015 Microchip Technology Inc.

DS00001622B-page 59

CAP1128

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

The LED Direct Ramp Rates register control the rising and falling edge time of an LED that is configured to operate in

Direct behavior mode. The rising edge time corresponds to the amount of time the LED takes to transition from its min-

imum duty cycle to its maximum duty cycle. Conversely, the falling edge time corresponds to the amount of time that

the LED takes to transition from its maximum duty cycle to its minimum duty cycle.

Bits 5 - 3 - RISE_RATE[2:0] - Determines the rising edge time of an LED when it transitions from its minimum drive state

to its maximum drive state as shown in Table 6-62.

Bits 2 - 0 - FALL_RATE[2:0] - Determines the falling edge time of an LED when it transitions from its maximum drive

state to its minimum drive state as shown in Table 6-62.

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

TABLE 6-62:

RISE / FALL RATE DECODE

RISE_RATE/ FALL_RATE/ Bit Decode

Rise / Fall Time (TRISE / TFALL)

250ms

500ms

750ms

1.25s

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