CAP1128 datasheet(56/75 Pages) MICROCHIP

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CAP1128

DS00001622B-page 56

 2015 Microchip Technology Inc.

6.33

LED Pulse 2 Period Register

The LED Pulse 2 Period register determines the overall period of a pulse operation as determined by the LED_CTL

registers (see Table 6-52 - setting 10b). 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 640ms.

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.

The Pulse 2 Behavior is shown in Figure 6-3 for non-inverted polarity (LEDx_POL = 1) and in Figure 6-4 for inverted

polarity (LEDx_POL = 0).

FIGURE 6-2:

Pulse 1 Behavior with Inverted Polarity

TABLE 6-54:

LED PULSE / BREATHE PERIOD EXAMPLE

Setting (HEX)

Setting (Decimal)

Total Breathe / Pulse Period (MS)

00h

01h

02h

03h

. . .

7Dh

125

4000

7Eh

126

4032

7Fh

127

4064

TABLE 6-55:

LED PULSE 2 PERIOD REGISTER

ADDR

R/W

B6B5B4B3B2

Default

85h

R/W

LED Pulse 2

Period

P2_

PER6

P2_

PER5

P2_

PER4

P2_

PER3

P2_

PER2

P2_

PER1

P2_

PER0

14h

Normal – untouched

operation

Normal – untouched

operation

Touch Detected or

Release Detected

Pulse 1 Min Duty Cycle * Brightness

X pulses after touch or after release

Pulse Period

(P1_PER)

Pulse 1 Max Duty Cycle * Brightness

LED

Brightness

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