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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10)

SMSC CAP1214

DATASHEET

Chapter 5 Product Description

The CAP1214 is a multiple channel Capacitive Touch sensor and LED Driver.

The CAP1214 has up to 14 individual Capacitive Touch sensor inputs with programmable sensitivity

for use in touch button and slider switch applications. Each sensor input includes automatic

recalibration.

The CAP1214 also has 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. 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 input is polled by the device approximately every 35 ms. The host may also initiate a

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

automatically invokes the re-calibration routine.

The CAP1214 contains multiple power states including several low power operating states. In addition,

it contains a user driven RESET pin.

A typical system diagram is shown in Figure 5.1.

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