2015 Microchip Technology Inc.
DS00001625B-page 1
General Description
The CAP1133, which incorporates RightTouch
®
tech-
nology, is a multiple channel Capacitive Touch sensor
with multiple power LED drivers. It contains three (3)
individual capacitive touch sensor inputs with program-
mable sensitivity for use in touch sensor applications.
Each sensor input automatically recalibrates to com-
pensate for gradual environmental changes.
The CAP1133 also contains three (3) LED drivers that
offer full-on / off, variable rate blinking, dimness con-
trols, 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 CAP1133 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, then a status bit is set and an interrupt gen-
erated.
Additionally, the CAP1133 includes circuitry and sup-
port for enhanced sensor proximity detection.
The CAP1133 offers multiple power states operating at
low quiescent currents. In the Standby state of opera-
tion, one or more capacitive touch sensor inputs are
active and all LEDs may be used.
Deep Sleep is the lowest power state available, draw-
ing 5uA (typical) of current. In this state, no sensor
inputs are active. Communications will wake the
device.
Applications
• Desktop and Notebook PCs
• LCD Monitors
• Consumer Electronics
• Appliances
Features
• Three (3) 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 Applica-
tions
• SMBus / I
2
C Compliant Communication Interface
• 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
• Three (3) LED Driver Outputs
- Open Drain or Push-Pull
- Programmable blink, breathe, and dimness
controls
- Can be linked to Capacitive Touch Sensor
inputs
• Available in 10-pin 3mm x 3mm RoHS compliant
DFN package
CAP1133
3 Channel Capacitive Touch Sensor with 3 LED Drivers
CAP1133
DS00001625B-page 2
2015 Microchip Technology Inc.
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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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An errata sheet, describing minor operational differences from the data sheet and recommended workarounds, may exist for cur-
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2015 Microchip Technology Inc.
DS00001625B-page 3
CAP1133
Table of Contents
1.0 Block Diagram ................................................................................................................................................................................. 4
2.0 Pin Description ................................................................................................................................................................................ 5
3.0 Electrical Specifications .................................................................................................................................................................. 9
4.0 Communications ........................................................................................................................................................................... 12
5.0 General Description ...................................................................................................................................................................... 23
6.0 Register Description ...................................................................................................................................................................... 29
7.0 Package Information ..................................................................................................................................................................... 67
Appendix A: Device Delta ................................................................................................................................................................... 72
Appendix B: Data Sheet Revision History ........................................................................................................................................... 74
The Microchip Web Site ...................................................................................................................................................................... 76
Customer Change Notification Service ............................................................................................................................................... 76
Customer Support ............................................................................................................................................................................... 76
Product Identification System ............................................................................................................................................................. 77
CAP1133
DS00001625B-page 4
2015 Microchip Technology Inc.
1.0
BLOCK DIAGRAM
SMBus
Slave
Protocol
SMCLK
SMDATA
VDD
GND
ALERT#
Capacitive Touch Sensing
Algorithm
CS1
CS2
CS3
LED1
LED Driver, Breathe, and
Dimness control
LED2
LED3
2015 Microchip Technology Inc.
DS00001625B-page 5
CAP1133
2.0
PIN DESCRIPTION
FIGURE 2-1:
CAP1133 Pin Diagram (10-Pin DFN)
TABLE 2-1:
PIN DESCRIPTION FOR CAP1133
Pin
Number
Pin Name
Pin Function
Pin Type
Unused
Connection
1
ALERT#
Active low alert / interrupt output usable for SMBus alert
OD (5V)
Connect to
Ground
Active high alert / interrupt output usable for SMBus alert
DO
leave open
2
SMDATA
Bi-directional, open-drain SMBus data - requires pull-up
DIOD (5V)
n/a
3
SMCLK
SMBus clock input - requires pull-up resistor
DI (5V)
4
VDD
Positive Power supply
Power
n/a
5
LED1
Open drain LED 1 driver (default)
OD (5V)
Connect to
Ground
Push-pull LED 1 driver
DO
leave open or
connect to Ground
6
LED2
Open drain LED 2 driver (default)
OD (5V)
Connect to
Ground
Push-pull LED 2 driver
DO
leave open or
connect to Ground
7
LED3
Open drain LED 3 driver (default)
OD (5V)
Connect to
Ground
Push-pull LED 3 driver
DO
leave open or
connect to Ground
GND
CS2
CS1
1
2
3
4
5
CS3
LED1
ALERT#
SMDATA
VDD
SMCLK
LED3
LED2
CAP1133
3mm x 3mm DFN
10
9
8
7
6
CAP1133
DS00001625B-page 6
2015 Microchip Technology Inc.
APPLICATION NOTE: When the ALERT# pinis 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 CAP1133 is unpowered.
The pin types are described in
Table 2-2
. All pins labeled with (5V) are 5V tolerant.
8
CS3
Capacitive Touch Sensor Input 3
AIO
Connect to
Ground
9
CS2
Capacitive Touch Sensor Input 2
AIO
Connect to
Ground
10
CS1
Capacitive Touch Sensor Input 1
AIO
Connect to
Ground
Bottom
Pad
GND
Ground
Power
n/a
TABLE 2-2:
PIN TYPES
Pin Type
Description
Power
This pin is used to supply power or ground to the device.
DI
Digital Input - This pin is used as a digital input. This pin is 5V tolerant.
AIO
Analog Input / Output -This pin is used as an I/O for analog signals.
DIOD
Digital Input / Open Drain Output - This pin is used as a digital I/O. When it is used as an out-
put, it is open drain and requires a pull-up resistor. This pin is 5V tolerant.
OD
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.
DO
Push-pull Digital Output - This pin is used as a digital output and can sink and source current.
DIO
Push-pull Digital Input / Output - This pin is used as an I/O for digital signals.
TABLE 2-1:
PIN DESCRIPTION FOR CAP1133 (CONTINUED)
Pin
Number
Pin Name
Pin Function
Pin Type
Unused
Connection
2015 Microchip Technology Inc.
DS00001625B-page 7
CAP1133
3.0
ELECTRICAL SPECIFICATIONS
Note 3-1
Stresses above those listed could cause permanent damage to the device. This is a stress rating
only and functional operation of the device at any other condition above those indicated in the
operation sections of this specification is not implied.
Note 3-2
For the 5V tolerant pins that have a pull-up resistor, the voltage difference between V
5VT_PIN
and V
DD
must never exceed 3.6V.
Note 3-3
The Package Power Dissipation specification assumes a recommended thermal via design consisting
of a 2x2 matrix of 0.3mm (12mil) vias at 1.0mm pitch connected to the ground plane with a 1.6 x
2.3mm thermal landing.
TABLE 3-1:
ABSOLUTE MAXIMUM RATINGS
Voltage on 5V tolerant pins (V
5VT_PIN
)
-0.3 to 5.5
V
Voltage on 5V tolerant pins (|V
5VT_PIN
- V
DD
|)
Note 3-2
0 to 3.6
V
Voltage on VDD pin
-0.3 to 4
V
Voltage on any other pin to GND
-0.3 to VDD + 0.3
V
Package Power Dissipation up to T
A
= 85°C for 10 pin DFN
(see
Note 3-3
)
0.7
W
Junction to Ambient (
θ
JA
)
77.7
°C/W
Operating Ambient Temperature Range
-40 to 125
°C
Storage Temperature Range
-55 to 150
°C
ESD Rating, All Pins, HBM
8000
V
CAP1133
DS00001625B-page 8
2015 Microchip Technology Inc.
TABLE 3-2:
ELECTRICAL SPECIFICATIONS
V
DD
= 3V to 3.6V, T
A
= 0°C to 85°C, all typical values at T
A
= 27°C unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
Unit
Conditions
DC Power
Supply Voltage
V
DD
3.0
3.3
3.6
V
Supply Current
I
STBY
120
170
uA
Standby state active
1 sensor input monitored
No LEDs active
Default conditions (8 avg, 70ms
cycle time)
I
STBY
50
uA
Standby state active
1 sensor input monitored
No LEDs active
1 avg, 140ms cycle time,
I
DSLEEP
5
15
uA
Deep Sleep state active
LEDs at 100% or 0% Duty Cycle
No communications
T
A
< 40°C
3.135 < V
DD
< 3.465V
I
DD
500
600
uA
Capacitive Sensing Active
No LEDs active
Capacitive Touch Sensor Inputs
Maximum Base
Capacitance
C
BASE
50
pF
Pad untouched
Minimum Detectable
Capacitive Shift
Δ
C
TOUCH
20
fF
Pad touched - default conditions (1
avg, 35ms cycle time, 1x sensitiv-
ity)
Recommended Cap
Shift
Δ
C
TOUCH
0.1
2
pF
Pad touched - Not tested
Power Supply Rejec-
tion
PSR
±3
±10
counts /
V
Untouched Current Counts
Base Capacitance 5pF - 50pF
Maximum sensitivity
Negative Delta Counts disabled
All other parameters default
Timing
Time to communica-
tions ready
t
COMM_DLY
15
ms
Time to first conver-
sion ready
t
CONV_DLY
170
200
ms
LED Drivers
Duty Cycle
DUTY
LED
0
100
%
Programmable
Drive Frequency
f
LED
2
kHz
Sinking Current
I
SINK
24
mA
V
OL
= 0.4
Sourcing Current
I
SOURCE
24
mA
V
OH
= V
DD
- 0.4
Leakage Current
I
LEAK
±5
uA
powered or unpowered
TA < 85°C
pull-up voltage < 3.6V if unpowered
I/O Pins
Output Low Voltage
V
OL
0.4
V
I
SINK_IO
= 8mA
Output High Voltage
V
OH
V
DD
- 0.4
V
I
SOURCE_IO
= 8mA
Input High Voltage
V
IH
2.0
V
2015 Microchip Technology Inc.
DS00001625B-page 9
CAP1133
Note 3-4
The ALERT pin will not glitch high or low at power up if connected to VDD or another voltage.
Note 3-5
The SMCLK and SMDATA pins will not glitch low at power up if connected to VDD or another voltage.
Input Low Voltage
V
IL
0.8
V
Leakage Current
I
LEAK
±5
uA
powered or unpowered
T
A
< 85°C
pull-up voltage < 3.6V if unpowered
SMBus Timing
Input Capacitance
C
IN
5
pF
Clock Frequency
f
SMB
10
400
kHz
Spike Suppression
t
SP
50
ns
Bus Free Time Stop to
Start
t
BUF
1.3
us
Start Setup Time
t
SU:STA
0.6
us
Start Hold Time
t
HD:STA
0.6
us
Stop Setup Time
t
SU:STO
0.6
us
Data Hold Time
t
HD:DAT
0
us
When transmitting to the master
Data Hold Time
t
HD:DAT
0.3
us
When receiving from the master
Data Setup Time
t
SU:DAT
0.6
us
Clock Low Period
t
LOW
1.3
us
Clock High Period
t
HIGH
0.6
us
Clock / Data Fall Time
t
FALL
300
ns
Min = 20+0.1C
LOAD
ns
Clock / Data Rise
Time
t
RISE
300
ns
Min = 20+0.1C
LOAD
ns
Capacitive Load
C
LOAD
400
pF
per bus line
TABLE 3-2:
ELECTRICAL SPECIFICATIONS (CONTINUED)
V
DD
= 3V to 3.6V, T
A
= 0°C to 85°C, all typical values at T
A
= 27°C unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
Unit
Conditions
CAP1133
DS00001625B-page 10
2015 Microchip Technology Inc.
4.0
COMMUNICATIONS
4.1
Communications
The CAP1133 communicates using the SMBus or I
2
C protocol.
The supports the following protocols: Send Byte, Receive Byte, Read Byte, Write Byte, Read Block, and Write Block.
In addition, the device supports I
2
C formatting for block read and block write protocols.
4.2
System Management Bus
The CAP1133 communicates with a host controller, such as an SIO, through the SMBus. The SMBus is a two-wire serial
communication protocol between a computer host and its peripheral devices. A detailed timing diagram is shown in
Figure 4-1
. Stretching of the SMCLK signal is supported; however, the CAP1133 will not stretch the clock signal.
4.2.1
SMBUS START BIT
The SMBus Start bit is defined as a transition of the SMBus Data line from a logic ‘1’ state to a logic ‘0’ state while the
SMBus Clock line is in a logic ‘1’ state.
4.2.2
SMBUS ADDRESS AND RD / WR BIT
The SMBus Address Byte consists of the 7-bit slave address followed by the RD / WR indicator bit. If this RD / WR bit
is a logic ‘0’, then the SMBus Host is writing data to the slave device. If this RD / WR bit is a logic ‘1’, then the SMBus
Host is reading data from the slave device.
The CAP1133 responds to SMBus address 0101_000(r/w).
4.2.3
SMBUS DATA BYTES
All SMBus Data bytes are sent most significant bit first and composed of 8-bits of information.
4.2.4
SMBUS ACK AND NACK BITS
The SMBus slave will acknowledge all data bytes that it receives. This is done by the slave device pulling the SMBus
Data line low after the 8th bit of each byte that is transmitted. This applies to both the Write Byte and Block Write proto-
cols.
The Host will NACK (not acknowledge) the last data byte to be received from the slave by holding the SMBus data line
high after the 8th data bit has been sent. For the Block Read protocol, the Host will ACK each data byte that it receives
except the last data byte.
FIGURE 4-1:
SMBus Timing Diagram
SMDATA
SMCLK
T
LOW
T
RISE
T
HIGH
T
FALL
T
BUF
T
HD:STA
P
S
S - Start Condition
P - Stop Condition
T
HD:DAT
T
SU:DAT
T
SU:STA
T
HD:STA
P
T
SU:STO
S