CAP1114 datasheet(90/102 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.1 (02-04-11)

SMSC CAP1114

DATASHEET

Bits 5 - 3 - PULSE2_CNT[2:0] - Determines the number of pulses used for the Pulse 2 behavior as

shown in Table 6.75. The default is 100b.

Bits 2 - 0 - PULSE1_CNT[2:0] - Determines the number of pulses used for the Pulse 1 behavior as

shown in Table 6.75.

6.53

LED Pulse and Breathe Duty Cycle Registers

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

as shown in Table 6.77.

Table 6.75 PULSE_CNT Decode

PULSEX_CNT[2:0]

NUMBER OF BREATHS

5 (default)

Table 6.76 LED Period and Breathe Duty Cycle Registers

ADDR

R/W

DEFAULT

90h

R/W

LED Pulse 1

Duty Cycle

LED_P1_MAX_DUTY[3:0]

LED_P1_MIN_DUTY[3:0]

F0h

91h

R/W

LED Pulse 2

Duty cycle

LED_P2_MAX_DUTY[3:0]

LED_P2_MIN_DUTY[3:0]

F0h

92h

R/W

LED Breathe

Duty Cycle

LED_BR_MAX_DUTY[3:0]

LED_BR_MIN_DUTY[3:0]

F0h

93h

R/W

Direct Duty

Cycle

LED_DR_MAX_DUTY[3:0]

LED_DR_MIN_DUTY[3:0]

F0h

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