CAP1028 datasheet(63/71 Pages) SMSC

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8 Channel Capacitive Touch Sensor with 2 LED Drivers

Datasheet

SMSC CAP1028

Revision 1.1 (08-05-09)

DATASHEET

5.33

LED Direct Ramp Rates Register

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.

11%

14%

11%

18%

14%

25%

18%

35%

25%

50%

35%

70%

50%

100%

70%

Table 5.52 LED Direct Ramp Rates Register

ADDR

R/W

DEFAULT

94h

R/W

LED Direct

Ramp Rates

RISE_RATE[2:0]

FALL_RATE[2:0]

00h

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

(TOFF)

250ms

500ms

Table 5.51 LED Duty Cycle Decode (continued)

X_MAX/MIN_DUTY [3:0]

MAXIMUM DUTY CYCLE

MINIMUM DUTY CYCLE

CAP1028 Datasheet(PDF) 63 Page - SMSC Corporation

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