8 Channel Capacitive Touch Sensor with 2 LED Drivers
Datasheet
Table 5.54 LED Pulse / Breathe Period Example
SETTING
(HEX)
TOTAL BREATHE / PULSE
PERIOD (MS)
SETTING (DECIMAL)
00h
01h
02h
03h
. . .
7Dh
7Eh
7Fh
0
1
32
32
2
64
3
96
. . .
125
126
127
. . .
4000
4032
4064
5.33
LED Pulse 2 Period Register
Table 5.55 LED Pulse 2 Period Register
ADDR
85h
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
LED Pulse 2
Period
P2_
PER6
P2_
PER5
P2_
PER4
P2_
PER3
P2_
PER2
P2_
PER1
P2_
PER0
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 5.52 - setting 10b). 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 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).
Revision 1.32 (01-05-12)
SMSC CAP1128
DATA7S2HEET
SMSC [ SMSC CORPORATION ]
