CAP1208 datasheet(19/67 Pages) MICROCHIP

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8-Channel Capacitive Touch Sensor

Datasheet

 2014 Microchip Technology Inc.

DS00001570B-page 19

Chapter 4 General Description

The CAP1208 is a multiple channel capacitive touch sensor. It contains eight (8) individual capacitive

touch sensor inputs with programmable sensitivity for use in touch sensor applications. Each sensor

input is calibrated to compensate for system parasitic capacitance and automatically recalibrated to

compensate for gradual environmental changes.

The CAP1208 includes Multiple Pattern Touch recognition that allows the user to select a specific set

of buttons to be touched simultaneously. If this pattern is detected, a status bit is set and an interrupt

is generated.

The CAP1208 has Active and Standby states, each with its own sensor input configuration controls.

Power consumption in the Standby state is dependent on the number of sensor inputs enabled as well

as averaging, sampling time, and cycle time. Deep Sleep is the lowest power state available, drawing

5µA (typical) of current. In this state, no sensor inputs are active, and communications will wake the

device.

The device communicates with a host controller using SMBus / I2C. 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 touch is detected on any sensor pad.

A typical system diagram is shown in Figure 4.1.

Figure 4.1 System Diagram for CAP1208

CAP1208

CS6

Embedded

Controller

CS7

CS8

CS3

CS2

CS1

CS4

CS5

Touch

Button

Touch

Button

Touch

Button

Touch

Button

Touch

Button

Touch

Button

Touch

Button

Touch

Button

VDD

GND

3.0V to 5.5V

10kOhm

resistors

3.0V to 5.5V

1.0uF

0.1uF

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