8 Channel Capacitive Touch Sensor with 2 LED Drivers
Datasheet
Release Detected
Touch Detected
Normal – untouched
operation
Normal – untouched
X additional pulses after release
operation
(100% - Pulse 2 Min Duty Cycle) *
Brightness
LED
Brightness
. . .
(100% - Pulse 2 Max Duty Cycle) * Brightness
Pulse
Period
(P2_PER)
Figure 5.3 Pulse 2 Behavior with Non-Inverted Polarity
Release Detected
Touch Detected
Normal – untouched
operation
Normal – untouched
operation
X additional pulses after release
Pulse 2 Max Duty Cycle * Brightness
LED
Brightness
. . .
Pulse 2 Min Duty Cycle * Brightness
Pulse
Period
(P2_PER)
Figure 5.4 Pulse 2 Behavior with Inverted Polarity
Table 5.56 LED Breathe Period Register
5.34
LED Breathe Period Register
ADDR
86h
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
5Dh
LED Breathe
Period
BR_
PER6
BR_
PER5
BR_
PER4
BR_
PER3
BR_
PER2
BR_
PER1
BR_
PER0
R/W
-
The LED Breathe Period register determines the overall period of a breathe operation as determined
by the LED_CTL registers (see Table 5.52 - setting 11b). The LSB represents 32ms so that a setting
of 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 2976ms.
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.
SMSC CAP1128
Revision 1.32 (01-05-12)
DATA7S3HEET
SMSC [ SMSC CORPORATION ]
