CAP1114 datasheet(91/102 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1114

Revision 1.1 (02-04-11)

DATASHEET

Bits 3 - 0 - LED_X_MIN_DUTY[3:0] - Determines the minimum PWM duty cycle for the LED drivers

as shown in Table 6.77.

6.54

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 minimum 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 6.79.

Table 6.77 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 6.78 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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