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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.1 (02-04-11)

SMSC CAP1114

DATASHEET

Chapter 5 Product Description

The CAP1114 is a multiple channel Capacitive Touch sensor and LED Driver.

The CAP1114 contains up to 14 individual Capacitive Touch sensor inputs with programmable

sensitivity for use in touch button and slider switch applications. Each sensor also contains automatic

recalibration.

The CAP1114 also contains eleven (11) open drain LED drivers that offer full-on / off, variable rate

breathing, and dimness controls. Eight (8) of these LEDs can double as GPIOs and support open-drain

or push-pull operation. Capacitive buttons can be linked to LED outputs. Additionally, LEDs 1-7 may

be optionally linked to Buttons 1-7 so that when a touch is detected, the LED is actuated.

The device communicates with a host controller using SMBus. The host controller may poll the device

for updated information at any time or it may configure the device to flag an interrupt whenever a press

is detected on any sensor.

Each sensor is polled by the device approximately every 35 ms. The host may also initiate a

recalibration routine for one or more sensors or set up times and conditions so that the device

automatically invokes the re-calibration routine.

The CAP1114 contains multiple power states including several low power operating states. In addition,

it contains a user driven RESET pin to force the device to reset.

A typical system diagram is shown in Figure 5.1.

CAP1114 датащи(PDF) 22 Page - Microchip Technology