CAP1014 Datasheet, PDF (73/84 Pages) SMSC Corporation – Multiple Channel Capacitive Touch Sensor and LED Driver

Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Table 5.65 PULSE_CNT Decode
PULSEX_CNT[2:0]
2
1
0
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
NUMBER OF BREATHS
1
2
3
4
5 (default)
6
7
8
5.45 LED Pulse and Breathe Duty Cycle Registers
ADDR R/W
90h
R/W
91h
R/W
92h
R/W
93h
R/W
Table 5.66 LED Period and Duty Cycle Registers
REGISTER
LED Pulse 1
Duty Cycle
LED Pulse 2
Duty cycle
LED Pulse 3
Duty Cycle
Direct Duty
Cycle
B7
B6
B5
B4
LED_P1_MAX_DUTY[3:0]
LED_P2_MAX_DUTY[3:0]
LED_BR_MAX_DUTY[3:0]
LED_DR_MAX_DUTY[3:0]
B3
B2
B1
B0
LED_P1_MIN_DUTY[3:0]
LED_P2_MIN_DUTY[3:0]
LED_BR_MIN_DUTY[3:0]
LED_DR_MIN_DUTY[3:0]
DEFAULT
F0h
F0h
F0h
F0h
The LED Pulse and Breathe Duty Cycle registers determine the minimum and maximum duty cycle
settings used for the LED for each LED behavior. These settings affect the brightness of the LED when
it is fully off and fully on.
The LED driver duty cycle will ramp up from the minimum duty cycle (see Section 5.45) to the
maximum duty cycle and back down again.
APPLICATION NOTE: Changes to the Duty Cycle settings will be applied immediately. When the respective register
is written, the LED output will be reset to the minimum (or maximum) setting and restarted
at the updated settings.
APPLICATION NOTE: Upon power on reset (or upon release of the RESET pin), the first breath will breathe from
100% (or 0% duty cycle as determined by the polarity registers) to the programmed minimum
(or maximum as determined by the polarity registers) and then proceed normally.
Bits 7 - 4 - LED_X_MAX_DUTY[3:0] - Determines the maximum PWM duty cycle for the LED drivers
as shown in Table 5.67.
SMSC CAP1014
73
DATASHEET
Revision 1.65 (08-11-09)