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CAP1133 Schematic ( PDF Datasheet ) - Microchip

Teilenummer CAP1133
Beschreibung 3 Channel Capacitive Touch Sensor
Hersteller Microchip
Logo Microchip Logo 




Gesamt 30 Seiten
CAP1133 Datasheet, Funktion
CAP1133
3 Channel Capacitive Touch Sensor with 3 LED Drivers
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 / I2C 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
2015 Microchip Technology Inc.
DS00001625B-page 1






CAP1133 Datasheet, Funktion
CAP1133
TABLE 2-1: PIN DESCRIPTION FOR CAP1133 (CONTINUED)
Pin
Number
8
Pin Name
CS3
9 CS2
10
Bottom
Pad
CS1
GND
Pin Function
Capacitive Touch Sensor Input 3
Capacitive Touch Sensor Input 2
Capacitive Touch Sensor Input 1
Ground
Pin Type
AIO
AIO
AIO
Power
Unused
Connection
Connect to
Ground
Connect to
Ground
Connect to
Ground
n/a
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.
TABLE 2-2: PIN TYPES
Pin Type
Power
DI
AIO
DIOD
OD
DO
DIO
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 out-
put, 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.
Push-pull Digital Output - This pin is used as a digital output and can sink and source current.
Push-pull Digital Input / Output - This pin is used as an I/O for digital signals.
DS00001625B-page 6
2015 Microchip Technology Inc.

6 Page









CAP1133 pdf, datenblatt
CAP1133
TABLE 4-3: READ BYTE PROTOCOL
Start
Slave
Address
WR
ACK
Register
Address
1->0 0101_000 0
0
XXh
ACK
0
Start
1 ->0
Slave
Address
0101_000
RD ACK
10
Register
Data
XXh
NACK Stop
1 0 -> 1
4.3.3 SMBUS SEND BYTE
The Send Byte protocol is used to set the internal address register pointer to the correct address location. No data is
transferred during the Send Byte protocol as shown in Table 4-4.
APPLICATION NOTE: The Send Byte protocol is not functional in Deep Sleep (i.e., DSLEEP bit is set).
TABLE 4-4:
Start
1 -> 0
SEND BYTE PROTOCOL
Slave Address
WR
0101_000
0
ACK
0
Register Address
XXh
ACK
0
Stop
0 -> 1
4.3.4 SMBUS RECEIVE BYTE
The Receive Byte protocol is used to read data from a register when the internal register address pointer is known to
be at the right location (e.g., set via Send Byte). This is used for consecutive reads of the same register as shown in
Table 4-5.
APPLICATION NOTE: The Receive Byte protocol is not functional in Deep Sleep (i.e., DSLEEP bit is set).
TABLE 4-5:
Start
1 -> 0
RECEIVE BYTE PROTOCOL
Slave Address
RD
0101_000
1
ACK
0
Register Data
XXh
NACK
1
Stop
0 -> 1
4.4 I2C Protocols
The CAP1133 supports I2C Block Write and Block Read.
The protocols listed below use the convention in Table 4-1.
4.4.1 BLOCK WRITE
The Block Write is used to write multiple data bytes to a group of contiguous registers as shown in Table 4-6.
APPLICATION NOTE: When using the Block Write protocol, the internal address pointer will be automatically
incremented after every data byte is received. It will wrap from FFh to 00h.
TABLE 4-6:
Start
1 ->0
Register Data
XXh
BLOCK WRITE PROTOCOL
Slave
Address
WR ACK
0101_000
ACK
0
0
Register
Data
XXh
0
ACK
0
Register
Address
XXh
...
...
ACK
0
Register
Data
XXh
Register Data
XXh
ACK
ACK
0
Stop
0 0 -> 1
4.4.2 BLOCK READ
The Block Read is used to read multiple data bytes from a group of contiguous registers as shown in Table 4-7.
APPLICATION NOTE: When using the Block Read protocol, the internal address pointer will be automatically
incremented after every data byte is received. It will wrap from FFh to 00h.
DS00001625B-page 12
2015 Microchip Technology Inc.

12 Page





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