CAP1128 datasheet(55/75 Pages) MICROCHIP

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 2015 Microchip Technology Inc.

DS00001622B-page 55

CAP1128

6.32

LED Pulse 1 Period Register

The LED Pulse Period 1 register determines the overall period of a pulse operation as determined by the LED_CTL

registers (see Table 6-52 - setting 01b). The LSB represents 32ms so that a setting of 18h (24d) would represent a

period of 768ms (24 x 32ms = 768ms). The total range is from 32ms to 4.064 seconds as shown in Table 6-54 with the

default being 1024ms.

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.

Bit 7 - ST_TRIG - Determines the start trigger for the LED Pulse behavior.

• ‘0’ (default) - The LED will Pulse when a touch is detected or the drive bit is set.

• ‘1’ - The LED will Pulse when a release is detected or the drive bit is cleared.

The Pulse 1 operation is shown in Figure 6-1 when the LED output is configured for non-inverted polarity (LEDx_POL

= 1) and in Figure 6-2 for inverted polarity (LEDx_POL = 0).

TABLE 6-53:

LED PULSE 1 PERIOD REGISTER

ADDR

R/W

Default

84h

R/W

LED Pulse 1

Period

ST_

TRIG

P1_

PER6

P1_

PER5

P1_

PER4

P1_

PER3

P1_

PER2

P1_

PER1

P1_

PER0

20h

FIGURE 6-1:

Pulse 1 Behavior with Non-Inverted Polarity

Normal – untouched

operation

Normal – untouched

operation

Touch Detected or

Release Detected

(100% - Pulse 1 Max Duty Cycle) * Brightness

X pulses after touch or after release

Pulse 1 Period

(P1_PER)

(100% - Pulse 1 Min Duty Cycle) * Brightness

LED

Brightness

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