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PDF CAP1126 Data sheet ( Hoja de datos )

Número de pieza CAP1126
Descripción 6 Channel Capacitive Touch Sensor
Fabricantes SMSC Corporation 
Logotipo SMSC Corporation Logotipo



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CAP1126
6 Channel Capacitive Touch Sensor
with 2 LED Drivers
PRODUCT FEATURES
Datasheet
General Description
The CAP1126, which incorporates SMSC’s RightTouch® 1
technology, is a multiple channel Capacitive Touch sensor
with multiple power LED drivers. It contains six (6)
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 CAP1126 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 CAP1126 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 CAP1126 includes circuitry and support for
enhanced sensor proximity detection.
The CAP1126 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, the SMSC logo and RightTouch are registered trademarks
and the RightTouch logo is a trademark of Standard Microsystems
Corporation (“SMSC”).
Applications
„ Desktop and Notebook PCs
„ LCD Monitors
„ Consumer Electronics
„ Appliances
Features
„ Six (6) 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 Applications
„ Multiple Communication Interfaces
— SMBus / I2C compliant interface
— SMSC BC-Link interface
— SPI communications
— Pin selectable communications protocol and multiple
slave addresses (SMBus / I2C 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 16-pin 4mm x 4mm RoHS compliant QFN
package
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
SMSC CAP1126
CS1
CS2
CS3
CS4
CS5
CS6
DATASHEET
Revision 1.32 (01-05-12)

1 page




CAP1126 pdf
6 Channel Capacitive Touch Sensor with 2 LED Drivers
Datasheet
5.40 Product ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
5.41 Manufacturer ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
5.42 Revision Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Chapter 6 Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
6.1 CAP1126 Package Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
6.2 Package Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Appendix A Device Delta . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
A.1 Delta from CAP1026 to CAP1126 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Chapter 7 Datasheet Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
SMSC CAP1126
5
DATASHEET
Revision 1.32 (01-05-12)

5 Page





CAP1126 arduino
6 Channel Capacitive Touch Sensor with 2 LED Drivers
Datasheet
Table 1.1 Pin Description for CAP1126 (continued)
PIN
NUMBER
3
4
5
PIN NAME
SMDATA /
BC_DATA /
SPI_MSIO /
SPI_MISO
SMCLK /
BC_CLK /
SPI_CLK
LED1
PIN FUNCTION
SMDATA - Bi-directional, open-drain SMBus data -
requires pull-up resistor
BC_DATA - Bi-directional, open-drain BC-Link data -
requires pull-up resistor
SPI_MSIO - SPI Master-Slave-In-Out bidirectional port
when used in bi-directional mode
SPI_MISO - SPI Master-In-Slave-Out port when used in
normal mode
SMCLK - SMBus clock input - requires pull-up resistor
BC_CLK - BC-Link clock input
SPI_CLK - SPI clock input
Open drain LED 1 driver (default)
Push-pull LED 1 driver
6 LED2
Open drain LED 2 driver (default)
Push-pull LED 2 driver
7
RESET
Active high soft reset for system - resets all registers to
default values. If not used, connect to ground.
ALERT# - Active low alert / interrupt output for SMBus
alert or SPI interrupt
ALERT# - Active high push-pull alert / interrupt output for
8
ALERT# /
BC_IRQ#
SMBus alert or SPI interrupt
BC_IRQ# - Active low interrupt / optional for BC-Link
BC_IRQ# - Active high push-pull interrupt / optional for
BC-Link
9
ADDR_COMM
Address / communications select pin - pull-down resistor
determines address / communications mechanism
10 CS6
Capacitive Touch Sensor Input 6
11 CS5
Capacitive Touch Sensor Input 5
12 CS4
Capacitive Touch Sensor Input 4
13 CS3
Capacitive Touch Sensor Input 3
PIN TYPE
DIOD (5V)
DIO
DIO
DO
DI (5V)
DI (5V)
DI (5V)
OD (5V)
DO
OD (5V)
DO
DI (5V)
OD (5V)
DO
OD (5V)
DO
AI
AIO
AIO
AIO
AIO
UNUSED
CONNECTION
n/a
n/a
Connect to
Ground
leave open or
connect to
Ground
Connect to
Ground
leave open or
connect to
Ground
Connect to
Ground
Connect to
Ground
leave open
Connect to
Ground
leave open
n/a
Connect to
Ground
Connect to
Ground
Connect to
Ground
Connect to
Ground
SMSC CAP1126
11
DATASHEET
Revision 1.32 (01-05-12)

11 Page







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