CAP1114 Datasheet, PDF (91/102 Pages) SMSC Corporation – Multiple Channel Capacitive Touch Sensor and LED Driver

Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Bits 3 - 0 - LED_X_MIN_DUTY[3:0] - Determines the minimum PWM duty cycle for the LED drivers
as shown in Table 6.77.
Table 6.77 LED Duty Cycle Decode
X_MAX/MIN_DUTY [3:0]
3
2
1
MAXIMUM DUTY
MINIMUM DUTY
0
CYCLE
CYCLE
0
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
1
0
1
0
1
1
0
0
1
1
1
1
0
0
0
1
0
0
1
1
0
1
0
1
0
1
1
1
1
0
0
1
1
0
1
1
1
1
0
1
1
1
1
7%
9%
11%
14%
17%
20%
23%
26%
30%
35%
40%
46%
53%
63%
77%
100%
0%
7%
9%
11%
14%
17%
20%
23%
26%
30%
35%
40%
46%
53%
63%
77%
6.54 LED Direct Ramp Rates Register
ADDR R/W
94h
R/W
REGISTER
LED Direct
Ramp Rates
Table 6.78 LED Direct Ramp Rates Register
B7
B6
B5
B4
B3
B2
B1
B0 DEFAULT
-
-
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 behavior 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 6.79.
SMSC CAP1114
91
DATASHEET
Revision 1.1 (02-04-11)