CAP1114 datasheet(92/102 Pages) SMSC

92 / 102 page

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.1 (02-04-11)

SMSC CAP1114

DATASHEET

APPLICATION NOTE:

If a non-zero fall time is desired, the rise rate must be set to be equal to the desired fall rate.

This should be done as a register write after the LED has been actuated and before it is

unactuated.

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 6.79.

6.55

LED Off Delay Register

The LED Off Delay Register determines the amount of time an LED in Direct behavior mode remains

active after it is no longer actuated (such as after a release has been detected or the drive state has

been changed).

Bits 2 - 0 - DIR_OFF_DLY[2:0] - Determines the turn-off delay, as shown in Table 6.81, for all LEDs

that are configured to operate in Direct behavior mode.

Table 6.79 Rise / Fall Rate Cycle Decode

RISE/FALL_RATE [2:0]

RISE / FALL TIME (TRISE / TFALL)

250ms

500ms

750ms

1.25s

1.5s

Table 6.80 LED Off Delay Register

ADDR

R/W

DEFAULT

95h

R/W

LED Off Delay

DIR_OFF_DLY [2:0]

00h

Table 6.81 Off Delay Settings

DIR_OFF_DLY [2:0

OFF DELAY

TOFF_DLY

0.5s

1.0s

1.5s

CAP1114 Datasheet(PDF) 92 Page - SMSC Corporation

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