CAP1114 datasheet(84/102 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.1 (02-04-11)

SMSC CAP1114

DATASHEET

Bit 1 - CS2_LED2 - Links the LED2 output to a detected touch on the CS2 sensor. When a touch is

detected, the LED is actuated and will behave as determined by the LED Behavior controls.

Bit 0 - CS1_LED1 - Links the LED1 output to a detected touch on the CS1 sensor. When a touch is

detected, the LED is actuated and will behave as determined by the LED Behavior controls.

6.48

LED Behavior Registers

The LED Behavior Registers control the operation of LEDs. Each LEDx / GPIOx pin is controlled by a

2-bit field. If the LEDx / GPIOx pin is configured as an input, these bits are ignored.

If the corresponding LED output is linked to a Capacitive Touch Sensor, the appropriate behavior will

be enabled / disabled based on touches and releases.

If the LED output is not associated with a Capacitive Touch Sensor, the appropriate behavior will be

enabled / disabled by the LED Output Control register. If the respective LEDx_DR bit is set to a logic

‘1’, this will be associated as a “touch”, and if the LEDx_DR bit is set to a logic ‘0’, this will be

associated as a “release”.

Table 6.69 shows the behavior triggers. The defined behavior will activate when the Start Trigger is

met and will stop when the Stop Trigger is met. Note the behavior of the Breathe Hold and Pulse

Release option.

The LED Polarity Control register will determine the non actuated state of the LED outputs (see Section

6.44, "LED Polarity Registers").

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

Pulse behaviors), it must be unactuated 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, 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), 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’, 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, the LED will behave as if a release was detected.

6.48.1

LED Behavior 1 - 81h

Bits 7 - 6 - LED4_CTL[1:0] - Determines the behavior of LED4 / GPIO4 when configured to operate

as an LED output.

Table 6.68 LED Behavior Registers

ADDR

R/W

DEFAULT

81h

R/W

LED Behavior 1

LED4_CTL[1:0]

LED3_CTL[1:0]

LED2_CTL[1:0]

LED1_CTL[1:0]

00h

82h

R/W

LED Behavior 2

LED8_CTL[1:0]

LED7_CTL[1:0]

LED6_CTL[1:0]

LED5_CTL[1:0]

00h

83h

R/W

LED Behavior 3

LED11_ALT [1:0]

LED11_CTL [1:0]

LED10_CTL [1:0]

LED9_CTL[1:0]

00h

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