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PDF CAP1188 Data sheet ( Hoja de datos )

Número de pieza CAP1188
Descripción 8 Channel Capacitive Touch Sensor
Fabricantes SMSC Corporation　
Logotipo SMSC Corporation Logotipo



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CAP1188
8 Channel Capacitive Touch Sensor
with 8 LED Drivers
PRODUCT FEATURES
Datasheet
General Description
The CAP1188, which incorporates SMSC’s RightTouch® 1
technology, is a multiple channel Capacitive Touch sensor
with multiple power LED drivers. It contains eight (8)
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 CAP1188 also contains eight (8) 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 CAP1188 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 CAP1188 includes circuitry and support for
enhanced sensor proximity detection.
The CAP1188 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
„ 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 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
„ Eight (8) 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 24-pin 4mm x 4mm RoHS compliant QFN
package
Block Diagram
LED1 LED2 LED3 LED4
RESET
VDD GND
WAKE / SPI_MOSI
SPI_CS#
LED Driver, Breathe, and
Dimness control
Capacitive Touch Sensing Algorithm
SMBus /
BC-Link or
SPI Slave
Protocol
SMCLK / BC_CLK /
SPI_CLK
SMDATA / BC_DATA / SPI_MSIO /
SPI_MISO
ALERT# / BC_IRQ#
ADDR_COMM
LED5 LED6 LED7 LED8
CS1 CS2 CS3 CS4 CS5 CS6 CS7 CS8
SMSC CAP1188
DATASHEET
Revision 1.32 (01-05-12)

1 page




CAP1188 pdf
8 Channel Capacitive Touch Sensor with 8 LED Drivers
Datasheet
5.38 LED Off Delay Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
5.39 Sensor Input Calibration Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
5.40 Product ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
5.41 Manufacturer ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
5.42 Revision Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Chapter 6 Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
6.1 CAP1188 Package Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
6.2 Package Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Appendix A Device Delta . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
A.1 Delta from CAP1088 to CAP1188 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Chapter 7 Datasheet Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
SMSC CAP1188
5
DATASHEET
Revision 1.32 (01-05-12)

5 Page





CAP1188 arduino
8 Channel Capacitive Touch Sensor with 8 LED Drivers
Datasheet
PIN #
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Bottom
Pad
Table 1.1 Pin Description for CAP1188 (continued)
PIN NAME
LED7
PIN FUNCTION
Open drain LED 7 driver (default)
Push-pull LED 7 driver
PIN TYPE
OD (5V)
DO
LED8
Open drain LED 8 driver (default)
Push-pull LED 8 driver
ALERT# - Active low alert / interrupt output for
SMBus alert or SPI interrupt - requires pull-up
resistor (default)
ALERT# /
BC_IRQ#
ALERT - Active high push-pull alert / interrupt
output for SMBus alert or SPI interrupt
BC_IRQ# - Active low interrupt / optional for BC-
Link - requires pull-up resistor
BC_IRQ - Active high push-pull interrupt / optional
for BC-Link
ADDR_COMM
Address / communications select pin - pull-down
resistor determines address / communications
mechanism
CS8 Capacitive Touch Sensor Input 8
CS7
CS6
CS5
CS4
CS3
CS2
CS1
VDD
RESET
Capacitive Touch Sensor Input 7
Capacitive Touch Sensor Input 6
Capacitive Touch Sensor Input 5
Capacitive Touch Sensor Input 4
Capacitive Touch Sensor Input 3
Capacitive Touch Sensor Input 2
Capacitive Touch Sensor Input 1
Positive Power supply
Active high soft reset for system - resets all
registers to default values.
GND
Ground
OD (5V)
DO
OD (5V)
DO
OD (5V)
DO
AI
AIO
AIO
AIO
AIO
AIO
AIO
AIO
AIO
Power
DI (5V)
Power
UNUSED
CONNECTION
Connect to
Ground
leave open or
connect to
Ground
Connect to
Ground
leave open or
connect to
Ground
Connect to
Ground
leave open
Connect to
Ground
leave open
n/a
Connect to
Ground
Connect to GND
Connect to GND
Connect to GND
Connect to GND
Connect to GND
Connect to GND
Connect to GND
n/a
Connect to GND
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.
SMSC CAP1188
11
DATASHEET
Revision 1.32 (01-05-12)

11 Page







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