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PDF CAP1208 Data sheet ( Hoja de datos )
| Número de pieza | CAP1208 | |
| Descripción | 8-Channel Capacitive Touch Sensor | |
| Fabricantes | Microchip | |
| Logotipo |  |
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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 / 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.
DS00001570C-page 1
1 page  
FIGURE 1-3:
CAP1208 PIN DIAGRAM (16-PIN QFN)
CAP1208
1.3 Pin Description
TABLE 1-1: PIN DESCRIPTION FOR CAP1208
QFN Pin
#
SOIC Pin #
13
24
35
47
56
Pin Name
Pin Function
ALERT#
SMDATA
SMCLK
VDD
N/C
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
Pin Type
OD
Unused
Connection
Connect to
Ground
DIOD
n/a
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
5 Page 
CAP1208
3.2.6 SMBUS TIMEOUT
The CAP1208 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. CAP1208supports 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 CAP1208 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 CAP1208by 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 CAP1208 supports I2C formatting only.
3.3 SMBus Protocols
The CAP1208 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
(Note 3-1)
0
0
Register
Address
XXh
ACK
0
Register
Data
XXh
ACK
Stop
0 0 -> 1
Note 3-1 CAP1208-1 only. For other addressing options, see Section 3.2.2.
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.
DS00001570C-page 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet CAP1208.PDF ] | |
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