CAP1133 datasheet(48/63 Pages) MICROCHIP

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CAP1133

DS00001625B-page 48

 2015 Microchip Technology Inc.

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 min-

imum 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 6-62.

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 6-62.

6.38

LED Off Delay Register

The LED Off Delay register determines the amount of time that an LED remains at its maximum duty cycle (or minimum

as determined by the polarity controls) before it starts to ramp down. If the LED is operating in Breathe mode, this delay

is applied at the top of each “breath”. If the LED is operating in the Direct mode, this delay is applied when the LED is

unactuated.

Bits 6 - 4 - BR_OFF_DLY[2:0] - Determines the Breathe behavior mode off delay, which is the amount of time an LED

in Breathe behavior mode remains inactive after it finishes a breathe pulse (ramp on and ramp off), as shown in Figure 6-

5 (non-inverted polarity LEDx_POL = 1) and Figure 6-6 (inverted polarity LEDx_POL = 0). Available settings are shown

in Table 6-64.

TABLE 6-62:

RISE / FALL RATE DECODE

RISE_RATE/ FALL_RATE/ Bit Decode

Rise / Fall Time (TRISE / TFALL)

250ms

500ms

750ms

1.25s

1.5s

TABLE 6-63:

LED OFF DELAY REGISTER

ADDR

R/W

B5B4

B3B2

B1B0

Default

95h

R/W

LED Off Delay

BR_OFF_DLY[2:0]

DIR_OFF_DLY[3:0]

00h

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