SMSC CAP1105 / CAP1106

Revision 1.32 (01-05-12)

PRODUCT PREVIEW

Data Brief

PRODUCT FEATURES

CAP1105 / CAP1106

5 and 6 Channel Capacitive Touch

Sensor

General Description

The CAP1106 and CAP1105, which incorporate SMSC’s

Touch sensors. The CAP1106 contains six (6) individual

capacitive touch sensor inputs while the CAP1105 contains

five (5) sensor inputs. Both devices offer programmable

sensitivity for use in touch sensor applications. Each sensor

input automatically recalibrates to compensate for gradual

environmental changes.

The CAP1105 / CAP1106 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, then a status bit is set and an interrupt generated.

Additionally, the CAP1105 / CAP1106 includes circuitry and

support for enhanced sensor proximity detection.

The CAP1105 / CAP1106 offers multiple power states

operating at low quiescent currents. In the Standby state of

operation, one or more capacitive touch sensor inputs are

active.

Deep Sleep is the lowest power state available, drawing

5uA (typical) of current. In this state, no sensor inputs are

active. Communications will wake the device.

Applications

Desktop and Notebook PCs

LCD Monitors

Consumer Electronics

Appliances

Features

Six (6) Capacitive Touch Sensor Inputs - CAP1106

Five (5) Capacitive Touch Sensor Inputs - CAP1105

— Programmable sensitivity

— Automatic recalibration

— Individual thresholds for each button

Proximity Detection

Multiple Button Pattern Detection

Calibrates for Parasitic Capacitance

Analog Filtering for System Noise Sources

Press and Hold feature for Volume-like Applications

Multiple Communication Interfaces

— SMSC BC-Link interface (CAP1106-2 only)

— SPI communications (CAP1105 only)

Low Power Operation

— 5uA quiescent current in Deep Sleep

— 50uA quiescent current in Standby (1 sensor input

monitored)

— Samples one or more channels in Standby

Available in 10-pin 3mm x 3mm RoHS compliant DFN

package

1. SMSC, the SMSC logo and RightTouch are registered trademarks

and the RightTouch logo is a trademark of Standard Microsystems

Corporation ("SMSC").

CAP1106 BLOCK DIAGRAM

CAP1105 BLOCK DIAGRAM

SMBus /

BC-Link

Protocol

VDD

GND

Capacitive Touch Sensing Algorithm

CS1

CS2

CS3

CS4

CS5

CS6

SPI Protocol

SPI_CLK

SPI_MOSI

SPI_MISO

Capacitive Touch Sensing

Algorithm

CS1

CS2

CS3

CS4

CS5

SPI_CS#

VDD

GND