CAP1214 datasheet(95/107 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214

Revision 1.0 (08-30-10)

DATASHEET

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 - LED_X_MAX_DUTY[3:0] - Determines the maximum PWM duty cycle for the LED drivers

as shown in Table 6.84

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

as shown in Table 6.84.

6.58

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

Table 6.84 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 6.85 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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