Datasheet

8 Channel Capacitive Touch Sensor with 8 LED Drivers
Datasheet
SMSC CAP1188 81 Revision 1.32 (01-05-12)
DATASHEET
Bits 3 - 0 - DIR_OFF_DLY[3:0] - Determines the turn-off delay, as shown in Table 5.65, for all LEDs
that are configured to operate in Direct behavior mode.
The Direct behavior operation is determined by the combination of programmed Rise Time, Fall Time,
Min and Max Duty cycles, Off Delay, and polarity. Figure 5.7 shows the behavior for non-inverted
polarity (LEDx_POL = 1) while Figure 5.8 shows the behavior for inverted polarity (LEDx_POL = 0).
Table 5.64 Breathe Off Delay Settings
BR_OFF_DLY [2:0]
OFF DELAY210
0 0 0 0 (default)
0 0 1 0.25s
010 0.5s
0 1 1 0.75s
100 1.0s
1 0 1 1.25s
110 1.5s
111 2.0s
Figure 5.7 Direct Behavior for Non-Inverted Polarity
Normal –
untouched
operation
RISE_RATE
Setting (t
RISE
)
(100% - Max Duty
Cycle) * Brightness
Touch
Detected
Release
Detected
Off Delay
(t
OFF_DLY
)
FALL_RATE
Setting (t
FALL
)
Normal –
untouched
operation
(100% - Min Duty Cycle) *
Brightness
LED
Brightness