CAP1014 datasheet(73/84 Pages) SMSC

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1014

Revision 1.65 (08-11-09)

DATASHEET

5.45

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 (see Section 5.45) to the

maximum duty cycle and back down again.

APPLICATION NOTE: Changes to the Duty Cycle settings will be applied immediately. When the respective register

is written, the LED output will be reset to the minimum (or maximum) setting and restarted

at the updated settings.

APPLICATION NOTE: Upon power on reset (or upon release of the RESET pin), the first breath will breathe from

100% (or 0% duty cycle as determined by the polarity registers) to the programmed minimum

(or maximum as determined by the polarity registers) and then proceed normally.

Bits 7 - 4 - LED_X_MAX_DUTY[3:0] - Determines the maximum PWM duty cycle for the LED drivers

as shown in Table 5.67.

Table 5.65 PULSE_CNT Decode

PULSEX_CNT[2:0]

NUMBER OF BREATHS

5 (default)

Table 5.66 LED Period and 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 Pulse 3

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

CAP1014 Datasheet(PDF) 73 Page - SMSC Corporation

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