CAP1028 datasheet(64/71 Pages) SMSC

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8 Channel Capacitive Touch Sensor with 2 LED Drivers

Datasheet

Revision 1.1 (08-05-09)

SMSC CAP1028

DATASHEET

5.34

LED Off Delay Register

The LED Off Delay register determines the amount of time an LED In Direct 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 for all LEDs that are configured to

operate in Direct Mode as shown in Table 5.53.

The Direct Mode operation is determined by the combination of programmed Rise Time, Fall Time, Min

and Max Duty cycles, Off Delay, and polarity. Figure 5.5 shows the behavior for Non-Inverted polarity

while Figure 5.6 shows the behavior for inverted polarity.

750ms

1.25s

1.5s

Table 5.54 LED Off Delay Register

ADDR

R/W

DEFAULT

95h

R/W

LED Off Delay

DIR_OFF_DLY [2:0]

00h

Figure 5.5 Direct Mode Behavior for Non-Inverted Polarity

Table 5.53 Rise / Fall Rate and Off Delay Decode (continued)

RISE_RATE/ FALL_RATE / DIR_OFF_DLY [2:0]

RISE / FALL TIME (TRISE / TFALL), OFF DELAY

(TOFF)

N orm al –

untouched

operation

RISE _R ATE

S etting (tRISE)

(100% - M ax D uty

C ycle) * B rightness

Touch

Detected

R elease

Detected

Off D elay

(tOFF_DLY)

FA LL_R A TE

S etting (tFALL)

N orm al –

untouched

operation

(100% - M in D uty C ycle) *

B rightness

LE D

B rightness

CAP1028 Datasheet(PDF) 64 Page - SMSC Corporation

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