CAP1296 datasheet(15/68 Pages) MICROCHIP

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 2013-2015 Microchip Technology Inc.

DS00001569B-page 15

CAP1296

4.0

GENERAL DESCRIPTION

The CAP1296 is a multiple channel capacitive touch sensor. It contains six (6) 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.

In addition, the CAP1296 can be configured to detect proximity on one or more channels with an optional signal guard

to reduce noise sensitivity.

The CAP1296includes 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 CAP1296 has Active and Standby states, each with its own sensor input configuration controls. The Combo state

allows a combination of sensor input controls to be used which enables one or more sensor inputs to operate as buttons

while another sensor input is operating as a proximity detector. Power consumption in the Standby and Combo states

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 com-

munications 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 CAP1296

CAP1296

CS4

Embedded

Controller

3.0V to 5.5V

CS5

CS6

CS2

CS1

Touch

Button

Touch

Button

Touch

Button

Proximity

Sensor

Touch

Button

SG*

VDD

GND

* CS3 / SG is a multi-function pin. If not

using the signal guard shown here, CS3

can be another touch button.

10kOhm

resistors

3.0V to 5.5V

1.0uF

0.1uF

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