CAP1208 Datasheet, PDF (1/67 Pages) Microchip Technology – 8-Channel Capacitive Touch Sensor

8-Channel Capacitive Touch Sensor
CAP1208
PRODUCT FEATURES
Datasheet
General Description
The CAP1208 which incorporates RightTouch^® technology,
is a multiple channel capacitive touch sensor. It contains
eight (8) individual capacitive touch sensor inputs with
programmable sensitivity for use in touch sensor
applications. Each sensor input is calibrated to compensate
for system parasitic capacitance and automatically
recalibrated to compensate for gradual environmental
changes.
The CAP1208 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, a status
bit is set and an interrupt is generated.
The CAP1208 has Active and Standby states, each with its
own sensor input configuration controls. Power
consumption in the Standby state is dependent on the
number of sensor inputs enabled as well as averaging,
sampling time, and cycle time. Deep Sleep is the lowest
power state available, drawing 5µA (typical) of current. In
this state, no sensor inputs are active, and communications
will wake the device.
Applications
 Desktop and Notebook PCs
 LCD Monitors
 Consumer Electronics
 Appliances
Features
 Eight (8) Capacitive Touch Sensor Inputs
— Programmable sensitivity
— Automatic recalibration
— Calibrates for parasitic capacitance
— Individual thresholds for each button
 Multiple Button Pattern Detection
 Power Button Support
 Press and Hold Feature for Volume-like Applications
 3.3V or 5V Supply
 Analog Filtering for System Noise Sources
 RF Detection and Avoidance Filters
 Digital EMI Blocker
 8kV ESD Rating on All Pins (HBM)
 Low Power Operation
— 5µA quiescent current in Deep Sleep
— 50µA quiescent current in Standby (1 sensor input
monitored)
— Samples one or more channels in Standby
 SMBus / I²C Compliant Communication Interface
 Available in a 16-pin 3mm x 3mm QFN RoHS compliant
package
Block Diagram
VDD GND
Capacitive Touch Sensing Algorithm
SMBus
Protocol
SMCLK
SMDATA
ALERT#
CS1 CS2 CS3 CS4 CS5 CS6 CS7 CS8
 2014 Microchip Technology Inc.
DS00001570B-page 1