CAP1128 datasheet(57/75 Pages) MICROCHIP

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 2015 Microchip Technology Inc.

DS00001622B-page 57

CAP1128

6.34

LED Breathe Period Register

The LED Breathe Period register determines the overall period of a breathe operation as determined by the LED_CTL

registers (see Table 6-52 - setting 11b). The LSB represents 32ms so that a setting of 18h (24d) would represent a

period of 768ms. The total range is from 32ms to 4.064 seconds (see Table 6-54) with a default of 2976ms.

APPLICATION NOTE: Due to constraints on the LED Drive PWM operation, any Breathe Period less than 160ms

(05h) may not be achievable. The device will breathe at the minimum period possible as

determined by the period and min / max duty cycle settings.

FIGURE 6-3:

Pulse 2 Behavior with Non-Inverted Polarity

FIGURE 6-4:

Pulse 2 Behavior with Inverted Polarity

TABLE 6-56:

LED BREATHE PERIOD REGISTER

ADDR

R/W

Default

86h

R/W

LED Breathe

Period

BR_

PER6

BR_

PER5

BR_

PER4

BR_

PER3

BR_

PER2

BR_

PER1

BR_

PER0

5Dh

. . .

Normal – untouched

operation

Normal – untouched

operation

Touch Detected

(100% - Pulse 2 Min Duty Cycle) *

Brightness

(100% - Pulse 2 Max Duty Cycle) * Brightness

X additional pulses after release

Release Detected

Pulse

Period

(P2_PER)

LED

Brightness

Normal – untouched

operation

Normal – untouched

operation

Touch Detected

Pulse 2 Max Duty Cycle * Brightness

Pulse 2 Min Duty Cycle * Brightness

X additional pulses after release

Release Detected

Pulse

Period

(P2_PER)

LED

Brightness

. . .

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