CAP1188 datasheet(56/79 Pages) MICROCHIP

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CAP1188

DS00001620C-page 56

 2015 Microchip Technology Inc.

APPLICATION NOTE:

If an LED is not linked to a capacitive touch sensor input and is breathing (via the Breathe

or Pulse behaviors), it must be unactuated and then re-actuated before changes to behavior

are processed. For example, if the LED output is breathing and the Maximum duty cycle is

changed, this change will not take effect until the LED output control register is set to ‘0’ and

then re-set to ‘1’.

APPLICATION NOTE:

If an LED is not linked to the capacitive touch sensor input and configured to operate using

Pulse 1 Behavior, then the circuitry will only be actuated when the corresponding output

control bit is set. It will not check the bit condition until the Pulse 1 behavior is finished. The

device will not remember if the bit was cleared and reset while it was actuated.

APPLICATION NOTE:

If an LED is actuated and not linked and the desired LED behavior is changed, this new

behavior will take effect immediately; however, the first instance of the changed behavior

may act incorrectly (e.g. if changed from Direct to Pulse 1, the LED output may ‘breathe’ 4

times and then end at minimum duty cycle). LED Behaviors will operate normally once the

LED has been un-actuated and then re-actuated.

APPLICATION NOTE:

If an LED is actuated and it is switched from linked to a capacitive touch sensor input to

unlinked (or vice versa), the LED will respond to the new command source immediately if

the behavior was Direct or Breathe. For Pulse behaviors, it will complete the behavior

already in progress. For example, if a linked LED was actuated by a touch and the control

is changed so that it is unlinked, it will check the status of the corresponding LED Output

Control bit. If that bit is ‘0’, then the LED will behave as if a release was detected. Likewise,

if an unlinked LED was actuated by the LED Output Control register and the control is

changed so that it is linked and no touch is detected, then the LED will behave as if a release

was detected.

6.31.1

LED BEHAVIOR 1 - 81H

Bits 7 - 6 - LED4_CTL[1:0] - Determines the behavior of LED4 as shown in Table 6-52.

Bits 5 - 4 - LED3_CTL[1:0] - Determines the behavior of LED3 as shown in Table 6-52.

Bits 3 - 2 - LED2_CTL[1:0] - Determines the behavior of LED2 as shown in Table 6-52.

Bits 1 - 0 - LED1_CTL[1:0] - Determines the behavior of LED1 as shown in Table 6-52.

6.31.2

LED BEHAVIOR 2 - 82H

Bits 7 - 6 - LED8_CTL[1:0] - Determines the behavior of LED8 as shown in Table 6-52.

Bits 5 - 4 - LED7_CTL[1:0] - Determines the behavior of LED7 as shown in Table 6-52.

Bits 3 - 2 - LED6_CTL[1:0] - Determines the behavior of LED6 as shown in Table 6-52.

Bits 1 - 0 - LED5_CTL[1:0] - Determines the behavior of LED5 as shown in Table 6-52.

TABLE 6-52:

LEDX_CTL BIT DECODE

LEDx_CTL

[1:0]

Operation

Description

Start TRigger

Stop Trigger

Direct

The LED is driven to the programmed state

(active or inactive). See Figure 6-7

Touch Detected or

LED Output Con-

trol bit set

Release

Detected or

LED Output

Control bit

cleared

Pulse 1

The LED will “Pulse” a programmed number

of times. During each “Pulse” the LED will

breathe up to the maximum brightness and

back down to the minimum brightness so that

the total “Pulse” period matches the pro-

grammed value.

Touch or Release

Detected or LED

Output Control bit

set or cleared

(see Section 6.32)

n/a

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