6 Channel Capacitive Touch Sensor with 2 LED Drivers
Datasheet
Table 5.53 Rise / Fall Rate and Off Delay Decode (continued)
RISE_RATE/ FALL_RATE / DIR_OFF_DLY [2:0]
RISE / FALL TIME (TRISE / TFALL), OFF DELAY
(TOFF
2
1
0
)
0
1
1
1
1
1
1
1
0
0
1
1
0
1
0
1
0
1
500ms
750ms
1s
1.25s
1.5s
2s
5.34 LED Off Delay Register
Table 5.54 LED Off Delay Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
LED Off Delay
Register
95h
R/W
-
-
-
-
DIR_OFF_DLY [2:0]
00h
The LED Off Delay register determines the amount of time an LED In Direct Mode remains active after
it is no longer actuated (such as after a release has been detected or the drive state has been
changed).
Bits 2 - 0 - DIR_OFF_DLY[2:0] - Determines the turn-off delay for all LEDs that are configured to
operate in Direct Mode as shown in Table 5.53.
The Direct Mode operation is determined by the combination of programmed Rise Time, Fall Time, Min
and Max Duty cycles, Off Delay, and polarity. Figure 5.5 shows the behavior for Non-Inverted polarity
while Figure 5.6 shows the behavior for inverted polarity.
Normal –
untouched
operation
Release
Detected
Touch
Detected
Normal –
untouched
operation
(100% - Min Duty Cycle) *
Brightness
LED
Brightness
(100% - Max Duty
Cycle) * Brightness
RISE_RATE
Setting (tRISE
)
Off Delay
(tOFF_DLY
FALL_RATE
Setting (tFALL
)
)
Figure 5.5 Direct Mode Behavior for Non-Inverted Polarity
SMSC CAP1026
Revision 1.1 (08-05-09)
DATA6S3HEET
SMSC [ SMSC CORPORATION ]
