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CAP1128

8 Channel Capacitive Touch Sensor with 2 LED Drivers

General Description

The CAP1128, which incorporates RightTouch

®

tech-

nology, is a multiple channel Capacitive Touch sensor

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

individual capacitive touch sensor inputs with program-

mable sensitivity for use in touch sensor applications.

Each sensor input automatically recalibrates to com-

pensate for gradual environmental changes.

The CAP1128 also contains two (2) LED drivers that

offer full-on / off, variable rate blinking, dimness con-

trols, 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 recogni-

tion that allows the user to select a specific set of but-

tons to be touched simultaneously. If this pattern is

detected, then a status bit is set and an interrupt gen-

erated.

Additionally, the CAP1128 includes circuitry and sup-

port for enhanced sensor proximity detection.

The CAP1128 offers multiple power states operating at

low quiescent currents. In the Standby state of opera-

tion, 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, draw-

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

inputs are active. Driving the WAKE/SPI_MOSI pin or

communications will wake the device.

Features

• Eight (8) Capacitive Touch Sensor Inputs

- 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 Applica-

tions

• Multiple Communication Interfaces

- SMBus / I

2

C compliant interface

- SPI communications

- Pin selectable communications protocol and

multiple slave addresses (SMBus / I

2

C 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

• Two (2) LED Driver Outputs

- Open Drain or Push-Pull

- Programmable blink, breathe, and dimness

controls

- Can be linked to Capacitive Touch Sensor

inputs

• Dedicated Wake output flags touches in low

power state

• System RESET pin

• Available in 20-pin 4mm x 4mm QFN RoHS com-

pliant package

Applications

•

Desktop and Notebook PCs

LCD Monitors

Consumer Electronics

Appliances



2015 Microchip Technology Inc.

DS00001622B-page 1

CAP1128

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Most Current Data Sheet

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You can determine the version of a data sheet by examining its literature number found on the bottom outside corner of any page.

The last character of the literature number is the version number, (e.g., DS30000000A is version A of document DS30000000).

Errata

An errata sheet, describing minor operational differences from the data sheet and recommended workarounds, may exist for cur-

rent devices. As device/documentation issues become known to us, we will publish an errata sheet. The errata will specify the

revision of silicon and revision of document to which it applies.

To determine if an errata sheet exists for a particular device, please check with one of the following:

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When contacting a sales office, please specify which device, revision of silicon and data sheet (include -literature number) you are

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DS00001622B-page 2



2015 Microchip Technology Inc.

CAP1128

Table of Contents

1.0 Block Diagram ................................................................................................................................................................................. 4

2.0 Pin Description ................................................................................................................................................................................ 5

3.0 Electrical Specifications .................................................................................................................................................................. 9

4.0 Communications ........................................................................................................................................................................... 12

5.0 General Description ...................................................................................................................................................................... 23

6.0 Register Description ...................................................................................................................................................................... 29

7.0 Package Information ..................................................................................................................................................................... 67

Appendix A: Device Delta ................................................................................................................................................................... 72

Appendix B: Data Sheet Revision History ........................................................................................................................................... 74

The Microchip Web Site ...................................................................................................................................................................... 76

Customer Change Notification Service ............................................................................................................................................... 76

Customer Support ............................................................................................................................................................................... 76

Product Identification System ............................................................................................................................................................. 77



2015 Microchip Technology Inc.

DS00001622B-page 3

CAP1128

1.0

BLOCK DIAGRAM

LED1

LED2

RESET

VDD

GND

WAKE / SPI_MOSI

SPI_CS#

LED Driver, Breathe,

and Dimness control

Capacitive Touch Sensing Algorithm

SMBus /

BC-Link /

SPI Slave

Protocol

SMCLK/ BC_CLK /

SPI_CLK

SMDATA / BC_DATA/ SPI_MSIO /

SPI_MISO

ALERT# / BC_IRQ#

ADDR_COMM

CS1

CS2

CS3

CS4

CS5

CS6

CS7

CS8

DS00001622B-page 4



2015 Microchip Technology Inc.

CAP1128

2.0

PIN DESCRIPTION

CAP1128 Pin Diagram (20-Pin QFN)

VDD

CS1

CS2

CS3

17

CS4

16

FIGURE 2-1:

20

19

SPI_CS#

WAKE / SPI_MOSI

SMDAT / BC_DATA / SPI_MSIO /

SPI_MISO

SMCLK / BC_CLK / SPI_CLK

N/C

*

1

2

3

4

5

18

15

14

CS5

CS6

CS7

CS8

ADDR_COMM

CAP1128

20 pin QFN

13

12

11

10

6

7

8

9

GND

*

N/C pins must be connected to ground

TABLE 2-1:

Number

1

PIN DESCRIPTION FOR CAP1128

Pin Name

Pin Function

Pin Type

Unused

Connection

Connect to

Ground

SPI_CS#

Active low chip-select for SPI bus

WAKE - Active high wake / interrupt output

Standby power state - requires pull-down resistor

ALERT# / BC_IRQ#

LED1

LED2

RESET

N/C

*

DI (5V)

DO

2

WAKE / SPI_-

MOSI

WAKE - Active high wake input - requires pull-down

resistor

Deep Sleep power state

SPI_MOSI - SPI Master-Out-Slave-In port when used in

normal mode

Pull-down

Resistor

DI

Connect to

Ground

DI (5V)



2015 Microchip Technology Inc.

DS00001622B-page 5

CAP1128

CAP1128概述

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