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PDF CAP1293 Data sheet ( Hoja de datos )
| Número de pieza | CAP1293 | |
| Descripción | 3-Channel Capacitive Touch Sensor | |
| Fabricantes | Microchip | |
| Logotipo |  |
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CAP1293
3-Channel Capacitive Touch Sensor with Proximity
Detection & Signal Guard
General Description
The CAP1293 is a multiple channel capacitive touch
sensor controller. It contains three (3) 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.
In addition, the CAP1293 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 CAP1293 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 CAP1293 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
• Three (3) 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 / I2C Compliant Communication Interface
• Available in an 8-pin 2mm x 3mm TDFN RoHS
compliant package
• Available in an 8-pin SOIC RoHS compliant pack-
age
2013-2015 Microchip Technology Inc.
DS00001566B-page 1
1 page  
CAP1293
TABLE 1-1: PIN DESCRIPTION FOR CAP1293
QFN Pin SOIC Pin
##
11
22
33
44
55
66
Pin
Name
Pin Function
ALERT#
SMDATA
SMCLK
VDD
GND
CS3
ALERT# - Active low alert / interrupt output
for SMBus alert
SMDATA - Bi-directional, open-drain SMBus
or I2C data - requires pull-up resistor
SMCLK - SMBus or I2C clock input - requires
pull-up resistor
Positive Power supply
Ground
Capacitive Touch Sensor Input 3
Pin Type
OD
DIOD
DI
Power
Power
AIO
7 CS2 - Capacitive Touch Sensor Input 2
7 CS2 / SG
7 SG - Signal Guard output
8 8 CS1 Capacitive Touch Sensor Input 1
AIO
AIO
AIO
Bottom
pad
-
Exposed Not internally connected, but recommend
pad grounding
-
Unused
Connection
Connect to
Ground
n/a
n/a
n/a
n/a
Connect to
Ground
Connect to
Ground
Leave open
Connect to
Ground
-
APPLICATION NOTE: All digital pins are 5V tolerant pins.
The pin types are described in Table 1-2, "Pin Types".
TABLE 1-2: PIN TYPES
Pin Type
Power
DI
AIO
DIOD
OD
Description
This pin is used to supply power or ground to the device.
Digital Input - This pin is used as a digital input. This pin is 5V tolerant.
Analog Input / Output - This pin is used as an I/O for analog signals.
Digital Input / Open Drain Output - This pin is used as a digital I/O. When it is used as an
output, it is open drain and requires a pull-up resistor. This pin is 5V tolerant.
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.
2013-2015 Microchip Technology Inc.
DS00001566B-page 5
5 Page 
CAP1293
3.2.6 SMBUS TIMEOUT
The CAP1293 includes an SMBus timeout feature. Following a 30ms period of inactivity on the SMBus where the
SMCLK pin is held low, the device will timeout and reset the SMBus interface.
The timeout function defaults to disabled. It can be enabled by setting the TIMEOUT bit in the Configuration register
(see Section 5.6, "Configuration Registers").
3.2.7
SMBUS AND I2C COMPATIBILITY
The major differences between SMBus and I2C devices are highlighted here. For more information, refer to the SMBus
2.0 specification.
1. CAP1293 supports I2C fast mode at 400kHz. This covers the SMBus max time of 100kHz.
2. Minimum frequency for SMBus communications is 10kHz.
3. The SMBus client protocol will reset if the clock is held low longer than 30ms (timeout condition). This can be
enabled in the CAP1293 by setting the TIMEOUT bit in the Configuration register. I2C does not have a timeout.
4. The SMBus client protocol will reset if both the clock and the data line are high for longer than 200us (idle con-
dition). This can be enabled in the CAP1293 by setting the TIMEOUT bit in the Configuration register. I2C does
not have an idle condition.
5. I2C devices do not support the Alert Response Address functionality (which is optional for SMBus).
6. I2C devices support block read and write differently. I2C protocol allows for unlimited number of bytes to be sent
in either direction. The SMBus protocol requires that an additional data byte indicating number of bytes to read /
write is transmitted. The CAP1293 supports I2C formatting only.
3.3 SMBus Protocols
The CAP1293 is SMBus 2.0 compatible and supports Write Byte, Read Byte, Send Byte, and Receive Byte as valid
protocols as shown below.
All of the below protocols use the convention in Table 3-1.
TABLE 3-1: PROTOCOL FORMAT
Data Sent to
Device
Data sent
Data Sent to the
HOst
Data sent
3.3.1 SMBUS WRITE BYTE
The Write Byte is used to write one byte of data to a specific register as shown in Table 3-2.
TABLE 3-2: WRITE BYTE PROTOCOL
Start
Slave
Address
WR ACK
1 ->0
0101_000
0
0
Register
Address
XXh
ACK
0
Register
Data
XXh
ACK
0
Stop
0 -> 1
3.3.2 SMBUS READ BYTE
The Read Byte protocol is used to read one byte of data from the registers as shown in Table 3-3.
2013-2015 Microchip Technology Inc.
DS00001566B-page 11
11 Page | ||
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| PDF Descargar | [ Datasheet CAP1293.PDF ] | |
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