CAP1126 datasheet(56/73 Pages) MICROCHIP

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CAP1126

DS00001623B-page 56

 2015 Microchip Technology Inc.

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.

6.35

LED Configuration Register

The LED Configuration register controls general LED behavior as well as the number of pulses that are sent for the

PULSE LED output behavior.

Bit 6 - RAMP_ALERT - Determines whether the device will assert the ALERT# pin when LEDs actuated by the LED

Output Control register bits have finished their respective behaviors. Interrupts will only be generated if the LED activity

is generated by writing the LED Output Control registers. Any LED activity associated with touch detection will not cause

an interrupt to be generated when the LED behavior has been finished.

• ‘0’ (default) - The ALERT# pin will not be asserted when LEDs actuated by the LED Output Control register have

finished their programmed behaviors.

• ‘1’ - The ALERT# pin will be asserted whenever any LED that is actuated by the LED Output Control register has

finished its programmed behavior.

Bits 5 - 3 - PULSE2_CNT[2:0] - Determines the number of pulses used for the Pulse 2 behavior as shown in Table 6-58.

Bits 2 - 0 - PULSE1_CNT[2:0] - Determines the number of pulses used for the Pulse 1 behavior as shown in Table 6-58.

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

TABLE 6-57:

LED CONFIGURATION REGISTER

ADDR

R/W

Default

88h

R/W

LED Config

RAMP_

ALERT

PULSE2_CNT[2:0]

PULSE1_CNT[2:0]

04h

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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