CAP1296
6-Channel Capacitive Touch Sensor with Proximity
Detection & Signal Guard
General Description
The CAP1296 is a multiple channel capacitive touch
sensor controller. It contains six (6) individual capaci-
tive touch sensor inputs with programmable sensitivity
for use in touch sensor applications. Each sensor input
is calibrated to compensate for system parasitic capac-
itance and automatically recalibrated to compensate
for gradual environmental changes.
In addition, the CAP1296 can be configured to detect
proximity on one or more channels with an optional sig-
nal guard to reduce noise sensitivity and to isolate the
proximity antenna from nearby conductive surfaces
that would otherwise attenuate the e-field.
The CAP1296 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, a status bit is set and an interrupt is gener-
ated.
The CAP1296 has Active and Standby states, each
with its own sensor input configuration controls. The
Combo state allows a combination of sensor input con-
trols to be used which enables one or more sensor
inputs to operate as buttons while another sensor input
is operating as a proximity detector. Power consump-
tion in the Standby and Combo states is dependent on
the number of sensor inputs enabled as well as averag-
ing, 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
• Six (6) Capacitive Touch Sensor Inputs
- Programmable sensitivity
- Automatic recalibration
- Calibrates for parasitic capacitance
- Individual thresholds for each button
• Proximity Detection
• Signal Guard
- Isolates the proximity antenna from attenua-
tion
- Reduces system noise sensitivity effects on
inputs
• Multiple Button Pattern Detection
• Power Button Support
• Press and Hold Feature for Volume-like Applica-
tions
• 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 / I
2
C Compliant Communication Interface
• Available in a 10-pin 3mm x 3mm DFN RoHS
compliant package
2013-2015 Microchip Technology Inc.
DS00001569B-page 1
CAP1296
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The last character of the literature number is the version number, (e.g., DS30000000A is version A of document DS30000000).
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DS00001569B-page 2
2013-2015 Microchip Technology Inc.
CAP1296
Table of Contents
1.0 Introduction ..................................................................................................................................................................................... 4
2.0 Pin Description and Configuration .................................................................................................................................................. 8
3.0 Functional Description .................................................................................................................................................................. 21
4.0 Register Descriptions .................................................................................................................................................................... 58
5.0 Operational Characteristics ........................................................................................................................................................... 69
6.0 Package Outline ............................................................................................................................................................................ 85
Appendix A: Data Sheet Revision History ........................................................................................................................................... 91
The Microchip Web Site ...................................................................................................................................................................... 93
Customer Change Notification Service ............................................................................................................................................... 93
Customer Support ............................................................................................................................................................................... 93
Product Identification System ............................................................................................................................................................. 94
2013-2015 Microchip Technology Inc.
DS00001569B-page 3
CAP1296
1.0
1.1
INTRODUCTION
Block Diagram
FIGURE 1-1:
CAP1296 BLOCK DIAGRAM
VDD
GND
SMCLK
CS3 /
SG
Capacitive Touch Sensing
Algorithm
SMBus
Protocol
SMDATA
ALERT#
CS1
CS2
CS4
CS5
CS6
1.2
Pin Diagrams
FIGURE 1-2:
CAP1296 14-PIN SOIC
N/C
CS1
SMDAT
SMCLK
1
2
CAP1296
4
5
14
13
12
11
10
9
8
N/C
CS2
CS3/SG
CS4
CS5
CS6
GND
ALERT# 3
N/C 6
VDD 7
DS00001569B-page 4
2013-2015 Microchip Technology Inc.
CAP1296
FIGURE 1-3:
CAP1296 PIN DIAGRAM (10-PIN 3 X 3 MM DFN)
CS1
ALERT#
SMDATA
SMCLK
VDD
1
2
3
4
5
GND
10
9
8
7
6
CS2
CS3 / SG
CS4
CS5
CS6
TABLE 1-1:
QFN Pin #
PIN DESCRIPTION FOR CAP1296
SOIC Pin #
Pin Name
Pin Function
Capacitive Touch Sensor Input 1
ALERT# - Active low alert / interrupt out-
put for SMBus alert - requires pull-up
resistor (default)
SMDATA - Bi-directional, open-drain
SMBus or I
2
C data - requires pull-up
resistor
SMCLK - SMBus or I
2
C clock input -
requires pull-up resistor
Positive Power supply
Capacitive Touch Sensor Input 6
Capacitive Touch Sensor Input 5
Capacitive Touch Sensor Input 4
CS3 - Capacitive Touch Sensor Input 3
CS3 / SG
12
SG - Signal guard output
CS2
GND
Capacitive Touch Sensor Input 2
Ground
AIO
AIO
Power
Pin Type
Unused
Connection
Connect to
Ground
Connect to
Ground
1
2
CS1
AIO
2
3
ALERT#
OD
3
4
SMDATA
DIOD
n/a
4
5
6
7
8
5
7
9
10
11
12
SMCLK
VDD
CS6
CS5
CS4
DI
Power
AIO
AIO
AIO
AIO
n/a
n/a
Connect to
Ground
Connect to
Ground
Connect to
Ground
Connect to
Ground
Leave Open
Connect to
Ground
n/a
9
10
Bottom
Pad
13
8
2013-2015 Microchip Technology Inc.
DS00001569B-page 5
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