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PDF CAP1298 Data sheet ( Hoja de datos )
| Número de pieza | CAP1298 | |
| Descripción | 8-Channel Capacitive Touch Sensor Controller | |
| Fabricantes | Microchip | |
| Logotipo |  |
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CAP1298
8-Channel Capacitive Touch Sensor Controller with
Proximity Detection & Signal Guard
General Description
The CAP1298 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.
In addition, the CAP1298 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 CAP1298 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 CAP1298 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
• Eight (8) 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 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.
DS00001571B-page 1
1 page  
FIGURE 1-3:
CAP1298 PIN DIAGRAM (16-PIN QFN)
CAP1298
ALERT# 1
SMDATA 2
SMCLK 3
VDD 4
Exposed pad
12 CS5 / SG
11 CS6
10 CS7
9 CS8
1.3 Pin Description
TABLE 1-1: PIN DESCRIPTION FOR CAP1298
QFN Pin
#
1
2
3
4
5
SOIC Pin #
3
4
5
7
6
Pin Name
ALERT#
SMDATA
SMCLK
VDD
N/C
Pin Function
ALERT# - Active low alert / interrupt out-
put 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
Not internally connected
6 - N/C Not internally connected
7
8
GND
Ground
8
-
GND
Ground
9 9 CS8 Capacitive Touch Sensor Input 8
10 10 CS7 Capacitive Touch Sensor Input 7
Pin Type
OD
DIOD
DI
Power
n/a
n/a
Power
Power
AIO
AIO
Unused
Connection
Connect to
Ground
n/a
n/a
n/a
Connect to
Ground
Connect to
Ground
n/a
n/a
Connect to
Ground
Connect to
Ground
2013-2015 Microchip Technology Inc.
DS00001571B-page 5
5 Page 
CAP1298
3.0 COMMUNICATIONS
3.1 Communications
The CAP1298 communicates using the SMBus or I2C protocol.
3.2 System Management Bus
The CAP1298 communicates with a host controller, such as an MCHP 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 3-1. Stretching of the SMCLK signal is supported; however, the CAP1298 will not stretch the clock sig-
nal.
FIGURE 3-1:
SMBUS TIMING DIAGRAM
T LOW
T HIGH
SMCLK
SMDATA
TBUF
T RISE
T HD:STA T HD:DAT
T FALL
T SU:DAT
PS
S - Start Condition
T HD:STA
T SU:STA
T SU:STO
S P - Stop Condition
P
3.2.1 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.
3.2.2 SMBUS ADDRESS AND RD / WR BIT
The SMBus Address Byte consists of the 7-bit client 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 client device. If this RD / WR bit is a logic ‘1’, then the SMBus
Host is reading data from the client device.
3.2.3
The CAP1298responds to SMBus address 0101_000(r/w). SMBUS DATA BYTES
All SMBus Data bytes are sent most significant bit first and composed of 8-bits of information.
3.2.4 SMBUS ACK AND NACK BITS
The SMBus client will acknowledge all data bytes that it receives. This is done by the client 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 client 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.
3.2.5 SMBUS STOP BIT
The SMBus Stop bit is defined as a transition of the SMBus Data line from a logic ‘0’ state to a logic ‘1’ state while the
SMBus clock line is in a logic ‘1’ state. When the CAP1298 detects an SMBus Stop bit and it has been communicating
with the SMBus protocol, it will reset its client interface and prepare to receive further communications.
2013-2015 Microchip Technology Inc.
DS00001571B-page 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet CAP1298.PDF ] | |
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