CAP1188-1-CP-TR datasheet(30/93 Pages) MICROCHIP

Part #	CAP1188-1-CP-TR

Description	8 Channel Capacitive Touch Sensor with 8 LED Drivers

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Manufacturer	MICROCHIP [Microchip Technology]

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8 Channel Capacitive Touch Sensor with 8 LED Drivers

Datasheet

Revision 1.32 (01-05-12)

30

SMSC CAP1188

DATASHEET

Chapter 4 General Description

The CAP1188 is a multiple channel Capacitive Touch sensor with multiple power LED drivers. It

contains eight (8) individual 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 CAP1188 also contains eight (8) 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.

Finally, the device contains a dedicated RESET pin to act as a soft reset by the system.

The CAP1188 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 contains a wake pin (WAKE/SPI_MOSI) output to wake the

system when a touch is detected in Standby and to wake the device from Deep Sleep.

The device communicates with a host controller using the SPI bus, SMSC BC-Link bus, or via 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.

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