Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Table 5.61 LED Pulse / Breathe Period Example (continued)
SETTING
(HEX)
TOTAL BREATHE / PULSE
PERIOD (MS)
SETTING (DECIMAL)
04h
. . .
4
128
. . .
. . .
124
125
126
127
7Ch
7Dh
7Eh
7Fh
3,968
4,000
4,032
4.064
5.42 LED Pulse 2 Period Register
Table 5.62 LED Behavior Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
LED Pulse 2
Period
P2_
PER6
P2_
PER5
P2_
PER4 PER3
P2_
P2_
PER2
P2_
PER1
P2_
PER0
85h
R/W
-
14h
The LED Pulse 2 Period register determines the overall period of a pulse operation as determined by
the LED_CTL registers (see Table 5.59 - setting 10b). Each LSB represents 32ms so that a setting of
14h (20d) would represent a period of 640ms. The total range is from 32ms to 4.06 seconds (see
Table 5.61).
The Pulse 2 Behavior is shown in Figure 5.3 (non-inverted polarity) and Figure 5.4 (inverted polarity).
Release Detected
Touch Detected
5 additional pulses after release
Normal –
Normal –
untouched
operation
untouched
operation
(100% - Pulse 2 Min Duty Cycle) *
Brightness
LED
Brightness
. . .
(100% - Pulse 2 Max Duty Cycle) * Brightness
Breathe
and Pulse
Period
(P2_PER)
Figure 5.3 Pulse 2 Behavior with Non-Inverted Polarity
SMSC CAP1014
Revision 1.65 (08-11-09)
DATA7S1HEET
SMSC [ SMSC CORPORATION ]
