CAP1208
8-Channel Capacitive Touch Sensor
General Description
The CAP1208 is a multiple channel capacitive touch
sensor controller. It contains eight (8) individual capac-
itive 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.
The CAP1208 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 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 low-
est power state available, drawing 5μA (typical) of cur-
rent. 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 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 16-pin 3mm x 3mm QFN RoHS
compliant package
• Available in a 14-pin SOIC RoHS compliant pack-
age
2013-2015 Microchip Technology Inc.
DS00001570C-page 1
CAP1208
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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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DS00001570C-page 2
2013-2015 Microchip Technology Inc.
CAP1208
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.
DS00001570C-page 3
CAP1208
1.0
1.1
INTRODUCTION
Block Diagram
FIGURE 1-1:
CAP1208 BLOCK DIAGRAM
1.2
Pin Diagrams
FIGURE 1-2:
CAP1208 14-PIN SOIC
CS2
CS1
ALERT#
SMDAT
SMCLK
1
2
3
CAP1208
4
5
14
13
12
11
10
9
8
CS3
CS4
CS5
CS6
CS7
CS8
GND
N/C 6
VDD 7
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2013-2015 Microchip Technology Inc.
CAP1208
FIGURE 1-3:
CAP1208 PIN DIAGRAM (16-PIN QFN)
1.3
Pin Description
TABLE 1-1:
QFN Pin
#
1
PIN DESCRIPTION FOR CAP1208
SOIC Pin #
3
Pin Name
ALERT#
Pin Function
ALERT# - Active low alert / interrupt out-
put for SMBus alert
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
Not internally connected
Not internally connected
Ground
Ground
Capacitive Touch Sensor Input 8
Pin Type
OD
Unused
Connection
Connect to
Ground
n/a
2
4
SMDATA
DIOD
3
4
5
6
7
8
9
5
7
6
-
8
-
9
SMCLK
VDD
N/C
N/C
GND
GND
CS8
DI
Power
n/a
n/a
Power
Power
AIO
n/a
n/a
Connect to
Ground
Connect to
Ground
n/a
n/a
Connect to
Ground
2013-2015 Microchip Technology Inc.
DS00001570C-page 5
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