CAP1114 datasheet(25/102 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1114

Revision 1.1 (02-04-11)

DATASHEET

5.2

RESET Pin

The RESET pin is an active high reset that is driven from an external source. The pin contains an

internal delay timer (tRST_FILT) that will block errant glitches on the RESET pin. The RESET pin must

be driven high or low longer than this time before the CAP1114 will react to the pin state.

While the RESET pin is held high, all the internal blocks will be held in reset including the SMBus. All

configuration settings will be reset to default states and all readings will be cleared. Furthermore, the

device will be held in Deep Sleep that can only be removed by driving the RESET pin low.

Once the RESET pin is pulled low, the CAP1114 will begin operation as if a power-on-reset had

occurred. When this happens, the RESET bit will be set and an interrupt will be generated.

5.3

LED Drivers

The CAP1114 contains eleven (11) LED Drivers. Each LED Driver is controlled independently of the

others and may be linked to the corresponding Capacitive Touch Sensor input. All LED drivers will

operate in one of the following modes. LED drivers 1 - 8 can be configured to operate with either push-

pull or open-drain drive and may also be configured to operate as GPIOs. LED drivers 9 - 11 will only

operate as open-drain drivers.

1. Direct - The LED is configured to be on or off when the corresponding input stimulus is on or off

(or inverted). The brightness of the LED can be programmed from full off to full on (default).

Additionally, the LED contains controls to individually configure ramping on, off, and turn-off delay.

2. Pulse 1 - The LED is configured to “Pulse” (transition ON-OFF-ON) a programmable number of

times with programmable rate and min / max brightness. Further, the LED can be configured to be

actuated upon a touch detection or release detection (or based on user written control registers).

3. Pulse 2 - The LED is configured to “Pulse” while actuated and then “Pulse” a programmable

number of times with programmable rate and min / max brightness when the sensor is released.

4. Breathe - The LED is configured to transition continuously ON-OFF-ON (i.e. to “Breathe”) with a

programmable rate and min / max brightness.

In addition to these four behaviors, all LED drivers support user initiated ramps and have an option to

assert the ALERT pin when the ramp has reached its maximum or minimum settings.

LED11 operates differently than the other LED outputs in three ways. First, it is configured to drive up

to two external LED channels simultaneously. Second, it is not disabled during the Sleep or Deep

Sleep states of operation (see Section 6.1). The third and final difference is it allows for different

behaviors when the device is in Fully Active state versus when the device is in Sleep or Deep Sleep

state.

5.3.1

Linking LEDs to Capacitive Touch Sensors

LEDs 1 - 7 can be optionally linked to Capacitive Touch Sensors 1-7 so that when the sensor detects

a button press, the corresponding LED will be actuated at one of the programmed responses.

LEDs 9 and 10 may be optionally linked to the Grouped Sensors to indicate a slide / tap / press and

hold in the “Up” or “Down” directions.

5.4

Capacitive Touch Sensing

The CAP1114 contains 14 independent Capacitive Touch Sensor inputs. Each sensor has dynamic

range to detect a change of capacitance due to a touch. Additionally, each sensor can be configured

to be automatically and routinely re-calibrated.

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