Datasheet

8 Channel Capacitive Touch Sensor with 8 LED Drivers
Datasheet
SMSC CAP1188 75 Revision 1.32 (01-05-12)
DATASHEET
18h (24d) would represent a period of 768ms. The total range is from 32ms to 4.064 seconds (see
Table 5.54) with a default of 640ms.
APPLICATION NOTE: Due to constraints on the LED Drive PWM operation, any Breathe Period less than 160ms
(05h) may not be achievable. The device will breathe at the minimum period possible as
determined by the period and min / max duty cycle settings.
The Pulse 2 Behavior is shown in Figure 5.3 for non-inverted polarity (LEDx_POL = 1) and in
Figure 5.4 for inverted polarity (LEDx_POL = 0).
5.34 LED Breathe Period Register
Figure 5.3 Pulse 2 Behavior with Non-Inverted Polarity
Figure 5.4 Pulse 2 Behavior with Inverted Polarity
Table 5.56 LED Breathe Period Register
ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT
86h R/W
LED Breathe
Period
-
BR_
PER6
BR_
PER5
BR_
PER4
BR_
PER3
BR_
PER2
BR_
PER1
BR_
PER0
5Dh
. . .
Normal – untouched
operation
Normal – untouched
operation
Touch Detected
(100% - Pulse 2 Min Duty Cycle) *
Brightness
(100% - Pulse 2 Max Duty Cycle) * Brightness
X additional pulses after release
Release Detected
Pulse
Period
(P2_PER)
LED
Brightness
Normal – untouched
operation
Normal – untouched
operation
Touch Detected
Pulse 2 Max Duty Cycle * Brightness
Pulse 2 Min Duty Cycle * Brightness
X additional pulses after release
Release Detected
Pulse
Period
(P2_PER)
LED
Brightness
. . .