CAP1128-1-BP-TR Standard Microsystems, CAP1128-1-BP-TR Datasheet

CAP1128-1-BP-TR

Manufacturer Part Number

CAP1128-1-BP-TR

Description

SQFNE3 20/ EIGHT CHANNEL CAPACITIVE TOUCH SENSOR WITH TWO LED DRIVERS

Manufacturer

Standard Microsystems

Datasheet

1.CAP1128-1-BP-TR.pdf (4 pages)

Specifications of CAP1128-1-BP-TR

Pack_quantity

4000

Comm_code

85423990

Lead_time

119

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8 Channel Capacitive Touch Sensor with 2 LED Drivers

PRODUCT FEATURES

General Description

The CAP1128, which incorporates SMSC’s RightTouch

technology, is a multiple channel Capacitive Touch sensor

with multiple power LED drivers. It contains eight (8)

i n d i v i d u a l c a p a c i t i v e t o u c h s e n s o r i n p u t s w i t h

programmable sensitivity for use in touch sensor

applications. Each sensor input automatically recalibrates

to compensate for gradual environmental changes.

The CAP1128 also contains two (2) 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 CAP1128 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 CAP1128 includes circuitry and support for

enhanced sensor proximity detection.

The CAP1128 offers multiple power states operating at low

quiescent currents. In the Standby state of operation, one

or more capacitive touch sensor inputs are active and all

LEDs may be used. If a touch is detected, it will wake the

system using the WAKE/SPI_MOSI pin.

Deep Sleep is the lowest power state available, drawing

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

active. Driving the WAKE/SPI_MOSI pin or communications

will wake the device.

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

SMSC CAP1128

RightTouch and the RightTouch logo are trademarks of Standard

Microsystems Corporation ("SMSC").

LED Driver, Breathe,

and Dimness control

LED1

LED2

CS1

RESET

CS2

Capacitive Touch Sensing Algorithm

CS3

CS4

PRODUCT PREVIEW

VDD

CS5

Block Diagram

GND

CS6

CS7

Applications

Features

CS8

Desktop and Notebook PCs

LCD Monitors

Consumer Electronics

Appliances

Eight (8) Capacitive Touch Sensor Inputs

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

Low Power Operation

Two (2) LED Driver Outputs

Dedicated Wake output flags touches in low power state

System RESET pin

Available in 20-pin 4mm x 4mm QFN RoHS compliant

— Programmable sensitivity

— Automatic recalibration

— Individual thresholds for each button

— SMBus / I

— SMSC BC-Link interface

— SPI communications

— Pin selectable communications protocol and multiple

— 5uA quiescent current in Deep Sleep

— 50uA quiescent current in Standby (1 sensor input

— Samples one or more channels in Standby

— Open Drain or Push-Pull

— Programmable blink, breathe, and dimness controls

— Can be linked to Capacitive Touch Sensor inputs

package

CAP1128

slave addresses (SMBus / I

monitored)

WAKE / SPI_MOSI

BC-Link /

SPI Slave

SMBus /

Protocol

C compliant interface

SPI_CS#

SMCLK/ BC_CLK /

SPI_CLK

SMDATA / BC_DATA/ SPI_MSIO /

SPI_MISO

ALERT# / BC_IRQ#

ADDR_COMM

C only)

Revision 1.2 (02-10-11)

Data Brief

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