CAP1133 datasheet(14/63 Pages) MICROCHIP

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CAP1133

DS00001625B-page 14

 2015 Microchip Technology Inc.

5.0

GENERAL DESCRIPTION

The CAP1133 is a multiple channel Capacitive Touch sensor with multiple power LED drivers. It contains three (3) indi-

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

input automatically recalibrates to compensate for gradual environmental changes.

The CAP1133 also contains three (3) low side (or push-pull) LED drivers that offer full-on / off, variable rate blinking,

dimness controls, and breathing. Each of the LED drivers may be linked to one of the sensor inputs to be actuated when

a touch is detected. As well, each LED driver may be individually controlled via a host controller.

The CAP1133 offers multiple power states. It operates at the lowest quiescent current during its Deep Sleep state. In

the low power Standby state, it can monitor one or more channels and respond to communications normally.

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 5-1.

5.1

Power States

The CAP1133 has three operating states depending on the status of the STBY and DSLEEP bits. When the device tran-

sitions between power states, previously detected touches (for inactive channels) are cleared and the status bits reset.

Fully Active - The device is fully active. It is monitoring all active capacitive sensor inputs and driving all LED chan-

nels as defined.

Standby - The device is in a lower power state. It will measure a programmable number of channels using the

Standby Configuration controls (see Section 6.20 through Section 6.22). Interrupts will still be generated based

on the active channels. The device will still respond to communications normally and can be returned to the Fully

Active state of operation by clearing the STBY bit.

FIGURE 5-1:

System Diagram for CAP1133

CAP1133

LED3

Embedded Controller

VDD

LED2

LED1

CS3

CS2

CS1

Touch

Button

Touch

Button

Touch

Button

3.3V – 5V

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