8 Channel Capacitive Touch Sensor with 2 LED Drivers
Datasheet
Table 5.62 Rise / Fall Rate Decode (continued)
RISE_RATE/ FALL_RATE/ BIT DECODE
2
1
0
RISE / FALL TIME (TRISE / TFALL))
1
1
1
1
0
1
1.5s
2s
5.38
LED Off Delay Register
Table 5.63 LED Off Delay Register
B6 B5 B4 B3
BR_OFF_DLY[2:0]
ADDR
R/W
REGISTER
B7
B2
B1
B0
DEFAULT
LED Off Delay
Register
95h
R/W
-
DIR_OFF_DLY[3:0]
00h
The LED Off Delay register determines the amount of time that an LED remains at its maximum duty
cycle (or minimum as determined by the polarity controls) before it starts to ramp down. If the LED is
operating in Breathe mode, this delay is applied at the top of each “breath”. If the LED is operating in
the Direct mode, this delay is applied when the LED is unactuated.
Bits 6 - 4 - BR_OFF_DLY[2:0] - Determines the Breathe behavior mode off delay, which is the amount
of time an LED in Breathe behavior mode remains inactive after it finishes a breathe pulse (ramp on
and ramp off), as shown in Figure 5.5 (non-inverted polarity LEDx_POL = 1) and Figure 5.6 (inverted
polarity LEDx_POL = 0). Available settings are shown in Table 5.64.
LED Actuated
LED Unactuated
100% - Breathe Max Min Cycle * Brightness
LED
Brightness
100% - Breathe Min Duty Cycle *
Brightness
Breathe
Period
Breathe Off
Delay
(BR_PER)
(BR_OFF_DLY)
Figure 5.5 Breathe Behavior with Non-Inverted Polarity
SMSC CAP1128
Revision 1.32 (01-05-12)
DATA7S7HEET
SMSC [ SMSC CORPORATION ]
