CAP1026 datasheet(56/70 Pages) SMSC

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6 Channel Capacitive Touch Sensor with 2 LED Drivers

Datasheet

Revision 1.1 (08-05-09)

SMSC CAP1026

DATASHEET

APPLICATION NOTE: If an LED is not linked to a Capacitive Touch Sensor and is breathing (via the Breathe or

Pulse behaviors), it will finish its current “breath” before any changes to behavior are

processed.

APPLICATION NOTE: If an LED is not linked to the Capacitive Touch Sensor and configured to operate using Pulse

1 Behavior, then the circuitry will only be actuated when the corresponding 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 it is switched from linked to a Capacitive Touch Sensor to unlinked

(or vice versa), then the LED will respond to the new command source immediately. 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.

APPLICATION NOTE: If the period for any breathe operation is changed while the LED is actuated, then the LED

output will be reset to 0% drive and any breathing will re-initiate at the new settings. For

Pulse 1 and Pulse 2 behaviors, the number of pulses will be retained.

Bits 3 - 2 - LED2_CTL[1:0] - Determines the behavior of LED2 as shown in Table 5.43.

Bits 1 - 0 - LED1_CTL[1:0] - Determines the behavior of LED1 as shown in Table 5.43.

APPLICATION NOTE: The PWM frequency is determined based on the selected LED behavior, the programmed

breathe period, and the programmed min and max duty cycles. For the Direct Mode, the

Table 5.43 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 5.5

Touch Detected

or LED Control

bit set

Release

Detected or

LED 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 programmed value.

Touch or

Release

Detected (See

Section 5.31) or

LED Control bit

set

n/a

Pulse 2

The LED will Breathe when the start trigger

is detected. When the stop trigger is

detected, it will “Pulse” a number of times

then return to its minimum brightness.

Touch Detected

or LED Control

bit set

Release

Detected or

LED Control

bit cleared

Breathe

The LED will breathe. It will be driven with

a duty cycle that ramps up from the

programmed minimum duty cycle (default

0%) to the programmed maximum duty

cycle duty cycle (default 100%) and then

back down. Each ramp takes up 50% of the

programmed period. The total period of

each “breath” is determined by the LED

Breathe Period controls - see Section 5.30.

Touch Detected

or LED Control

bit set

Release

Detected or

LED Control

bit cleared

CAP1026 Datasheet(PDF) 56 Page - SMSC Corporation

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