CAP1206 datasheet(14/63 Pages) MICROCHIP

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DS00001567B-page 14

CAP1206

4.0

GENERAL DESCRIPTION

The CAP1206 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.

The CAP1206includes 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 CAP1206 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.

4.1

Power States

The CAP1206 has 3 power states depending on the status of the STBY and DSLEEP bits. When the device transitions

between power states, previously detected touches (for channels that are being de-activated) are cleared and the sen-

sor input status bits are reset.

Active - The normal mode of operation. The device is monitoring capacitive sensor inputs enabled in the Active

state.

Standby - When the STBY bit is set, the device is monitoring the capacitive sensor inputs enabled in the Standby

state. Interrupts can still be generated based on the enabled channels. The device will still respond to communi-

cations normally and can be returned to the Active state of operation by clearing the STBY bit. Power consump-

FIGURE 4-1:

SYSTEM DIAGRAM FOR CAP1206

CAP1206

CS4

Embedded

Controller

3.0V to 5.5V

CS5

CS6

CS3

CS2

CS1

Touch

Button

Touch

Button

Touch

Button

Touch

Button

Touch

Button

Touch

Button

VDD

3.0V to 5.5V

GND

1.0uF

0.1uF

10kOhm

resistors

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