8 Channel Capacitive Touch Sensor with 8 LED Drivers
Datasheet
Table 5.51 LED Duty Cycle Decode (continued)
X_MAX/MIN_DUTY [3:0]
3
2
1
0
MAXIMUM DUTY CYCLE
MINIMUM DUTY CYCLE
0
0
0
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
1
1
0
0
1
1
0
0
1
1
1
0
1
0
1
0
1
0
1
0
1
6%
7%
5%
6%
9%
7%
11%
14%
18%
25%
35%
50%
70%
100%
9%
11%
14%
18%
25%
35%
50%
70%
5.33 LED Direct Ramp Rates Register
Table 5.52 LED Direct Ramp Rates Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
LED Direct
Ramp Rates
94h
R/W
-
-
RISE_RATE[2:0]
FALL_RATE[2:0]
00h
The LED Direct Ramp Rates register control the rising and falling edge time of an LED that is
configured to operate in Direct mode. The rising edge time corresponds to the amount of time the LED
takes to transition from its minimum duty cycle to its maximum duty cycle. Conversely, the falling edge
time corresponds to the amount of time that the LED takes to transition from its maximum duty cycle
to its minimum duty cycle.
Bits 5 - 3 - RISE_RATE[2:0] - Determines the rising edge time of an LED when it transitions from its
minimum drive state to its maximum drive state as shown in Table 5.53.
Bits 2 - 0 - FALL_RATE[2:0] - Determines the falling edge time of an LED when it transitions from its
maximum drive state to its minimum drive state as shown in Table 5.53.
Table 5.53 Rise / Fall Rate and Off Delay Decode
RISE_RATE/ FALL_RATE / DIR_OFF_DLY [2:0]
RISE / FALL TIME (TRISE / TFALL), OFF DELAY
2
1
0
(TOFF)
0
0
0
0
0
1
0
250ms
Revision 1.1 (08-05-09)
SMSC CAP1088
DATA6S4HEET
SMSC [ SMSC CORPORATION ]
