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CAP1126 Schematic ( PDF Datasheet ) - SMSC Corporation

Teilenummer CAP1126
Beschreibung 6 Channel Capacitive Touch Sensor
Hersteller SMSC Corporation
Logo SMSC Corporation Logo 




Gesamt 30 Seiten
CAP1126 Datasheet, Funktion
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)






CAP1126 Datasheet, Funktion
6 Channel Capacitive Touch Sensor with 2 LED Drivers
Datasheet
List of Figures
Figure 1.1
Figure 3.1
Figure 3.2
Figure 3.3
Figure 3.4
Figure 3.5
Figure 3.6
Figure 3.7
Figure 3.8
Figure 3.9
Figure 3.10
Figure 3.11
Figure 3.12
Figure 4.1
Figure 4.2
Figure 4.3
Figure 5.1
Figure 5.2
Figure 5.3
Figure 5.4
Figure 5.5
Figure 5.6
Figure 5.7
Figure 5.8
Figure 6.1
Figure 6.2
Figure 6.3
Figure 6.4
CAP1126 Pin Diagram (16-Pin QFN). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
SMBus Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
SPI Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Example SPI Bus Communication - Normal Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
SPI Reset Interface Command - Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
SPI Set Address Pointer Command - Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
SPI Write Command - Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
SPI Read Command - Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
SPI Read Command - Normal Mode - Full. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
SPI Reset Interface Command - Bi-directional Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
SPI Set Address Pointer Command - Bi-directional Mode . . . . . . . . . . . . . . . . . . . . . . . . . 28
SPI Write Data Command - Bi-directional Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
SPI Read Data Command - Bi-directional Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
System Diagram for CAP1126 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Sensor Interrupt Behavior - Repeat Rate Enabled. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Sensor Interrupt Behavior - No Repeat Rate Enabled . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Pulse 1 Behavior with Non-Inverted Polarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Pulse 1 Behavior with Inverted Polarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Pulse 2 Behavior with Non-Inverted Polarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Pulse 2 Behavior with Inverted Polarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Breathe Behavior with Non-Inverted Polarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Breathe Behavior with Inverted Polarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Direct Behavior for Non-Inverted Polarity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Direct Behavior for Inverted Polarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
16-Pin QFN 4mm x 4mm Package Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
16-Pin QFN 4mm x 4mm Package Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
16-Pin QFN 4mm x 4mm PCB Footprint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
CAP1126 Package Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Revision 1.32 (01-05-12)
6
DATASHEET
SMSC CAP1126

6 Page









CAP1126 pdf, datenblatt
6 Channel Capacitive Touch Sensor with 2 LED Drivers
Datasheet
PIN
NUMBER
14
PIN NAME
CS2
15
16
Bottom
Pad
CS1
VDD
GND
Table 1.1 Pin Description for CAP1126 (continued)
PIN FUNCTION
Capacitive Touch Sensor Input 2
Capacitive Touch Sensor Input 1
Positive Power supply
PIN TYPE
AIO
AIO
Power
UNUSED
CONNECTION
Connect to
Ground
Connect to
Ground
n/a
Ground
Power
n/a
APPLICATION NOTE: When the ALERT# pin is configured as an active low output, it will be open drain. When it
is configured as an active high output, it will be push-pull.
APPLICATION NOTE: For the 5V tolerant pins that have a pull-up resistor, the pull-up voltage must not exceed 3.6V
when the CAP1126 is unpowered.
APPLICATION NOTE: The SPI_CS# pin should be grounded when SMBus, I2C, or BC-Link communications are
used.
The pin types are described in Table 1.2. All pins labeled with (5V) are 5V tolerant.
PIN TYPE
Power
DI
AIO
DIOD
OD
DO
DIO
Table 1.2 Pin Types
DESCRIPTION
This pin is used to supply power or ground to the device.
Digital Input - This pin is used as a digital input. This pin is 5V tolerant.
Analog Input / Output -This pin is used as an I/O for analog signals.
Digital Input / Open Drain Output - This pin is used as a digital I/O. When it is used as an
output, it is open drain and requires a pull-up resistor. This pin is 5V tolerant.
Open Drain Digital Output - This pin is used as a digital output. It is open drain and requires
a pull-up resistor. This pin is 5V tolerant.
Push-pull Digital Output - This pin is used as a digital output and can sink and source
current.
Push-pull Digital Input / Output - This pin is used as an I/O for digital signals.
Revision 1.32 (01-05-12)
12
DATASHEET
SMSC CAP1126

12 Page





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