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PDF CAP1106 Data sheet ( Hoja de datos )
| Número de pieza | CAP1106 | |
| Descripción | 6 Channel Capacitive Touch Sensor | |
| Fabricantes | Microchip | |
| Logotipo |  |
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CAP1106
6 Channel Capacitive Touch Sensor
General Description
The CAP1106, which incorporates RightTouch® tech-
nology, is a multiple channel Capacitive Touch sensor.
The CAP1106 contains six (6) individual capacitive
touch sensor inputs. The device offers programmable
sensitivity for use in touch sensor applications. Each
sensor input automatically recalibrates to compensate
for gradual environmental changes.
The CAP1106 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 CAP1106 includes circuitry and sup-
port for enhanced sensor proximity detection.
The CAP1106 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.
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
• Six (6) Capacitive Touch Sensor Inputs -
CAP1106
- 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
• Multiple Communication Interfaces
- SMBus / I2C compliant interface
- BC-Link 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
• Available in 10-pin 3mm x 3mm RoHS compliant
DFN package
2014 Microchip Technology Inc.
DS00001624A-page 1
1 page  
2.0 PIN DESCRIPTION
FIGURE 2-1:
CAP1106 Pin Diagram (10-Pin DFN)
CAP1106
TABLE 2-1: PIN DESCRIPTION FOR CAP1106
Pin
Number
Pin Name
Pin Function
1 CS1
Capacitive Touch Sensor Input 1
Pin Type
AIO
ALERT# - Active low alert / interrupt output for SMBus alert
OD (5V)
ALERT# - Active high alert / interrupt output for SMBus alert
DO
2
ALERT# /
BC_IRQ#
BC_IRQ# - Active low interrupt / optional for BC-Link
OD (5V)
BC_IRQ# - Active high push-pull interrupt / optional for BC-
Link
DO
3
SMDATA /
BC_DATA
SMDATA - Bi-directional, open-drain SMBus data - requires
pull-up resistor
BC_DATA - Bi-directional, open-drain BC-Link data - requires
pull-up resistor
DIOD (5V)
DIO
4
SMCLK /
BC_CLK
SMCLK - SMBus clock input - requires pull-up resistor
BC_CLK - BC-Link clock input
DI (5V)
DI (5V)
5 VDD
Positive Power supply
Power
6 CS6
Capacitive Touch Sensor Input 6
AIO
Unused
Connection
Connect to
Ground
Connect to
Ground
leave open
Connect to
Ground
leave open
n/a
n/a
n/a
Connect to
Ground
2014 Microchip Technology Inc.
DS00001624A-page 5
5 Page 
CAP1106
4.2.4 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.
4.2.5 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 CAP1106 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.
4.2.6 SMBUS TIMEOUT
The CAP1106 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 6.6, "Configuration Registers").
4.2.7
SMBUS AND I2C COMPATIBILITY
The major differences between SMBus and I2C devices are highlighted here. For more information, refer to the SMBus
2.0 and I2C specifications. For information on using the CAP1106 in an I2C system, refer to SMSC AN 14.0 SMSC Ded-
icated Slave Devices in I2C Systems.
1. CAP1106 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 at a logic ‘0’ for longer than 30ms. This timeout function-
ality is disabled by default in the CAP1106 and can be enabled by writing to the TIMEOUT bit. I2C does not have
a timeout.
4. The SMBus client protocol will reset if both the clock and data lines are held at a logic ‘1’ for longer than 200μs
(idle condition). This function is disabled by default in the CAP1106 and can be enabled by writing to the TIME-
OUT bit. 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 CAP1106 supports I2C formatting only.
4.3 SMBus Protocols
The CAP1106 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 4-1.
TABLE 4-1: PROTOCOL FORMAT
Data Sent to Data Sent to the
Device
HOst
Data sent
Data sent
2014 Microchip Technology Inc.
DS00001624A-page 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet CAP1106.PDF ] | |
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