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PDF CAP1128 Data sheet ( Hoja de datos )
| Número de pieza | CAP1128 | |
| Descripción | 8 Channel Capacitive Touch Sensor | |
| Fabricantes | Microchip | |
| Logotipo |  |
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CAP1128
8 Channel Capacitive Touch Sensor with 2 LED Drivers
General Description
The CAP1128, which incorporates RightTouch® tech-
nology, is a multiple channel Capacitive Touch sensor
with multiple power LED drivers. It contains eight (8)
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 CAP1128 also contains two (2) 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 CAP1128 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 CAP1128 includes circuitry and sup-
port for enhanced sensor proximity detection.
The CAP1128 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. If a touch is detected,
it will wake the system using the WAKE/SPI_MOSI pin.
Deep Sleep is the lowest power state available, draw-
ing 5uA (typical) of current. In this state, no sensor
inputs are active. Driving the WAKE/SPI_MOSI pin or
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
- 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
- SPI communications
- Pin selectable communications protocol and
multiple slave addresses (SMBus / I2C only)
• 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
• Two (2) LED Driver Outputs
- Open Drain or Push-Pull
- Programmable blink, breathe, and dimness
controls
- Can be linked to Capacitive Touch Sensor
inputs
• Dedicated Wake output flags touches in low
power state
• System RESET pin
• Available in 20-pin 4mm x 4mm QFN RoHS com-
pliant package
2015 Microchip Technology Inc.
DS00001622B-page 1
1 page  
CAP1128
2.0 PIN DESCRIPTION
FIGURE 2-1:
CAP1128 Pin Diagram (20-Pin QFN)
SPI_CS# 1
WAKE / SPI_MOSI
SMDAT / BC_DATA / SPI_MSIO /
SPI_MISO
SMCLK / BC_CLK / SPI_CLK
2
3
4
N/C* 5
CAP1128
20 pin QFN
15 CS5
14 CS6
13 CS7
12 CS8
11 ADDR_COMM
GND
*N/C pins must be connected to ground
TABLE 2-1:
Pin
Number
PIN DESCRIPTION FOR CAP1128
Pin Name
Pin Function
Pin Type
1 SPI_CS#
Active low chip-select for SPI bus
DI (5V)
WAKE - Active high wake / interrupt output
Standby power state - requires pull-down resistor
DO
2
WAKE / SPI_-
MOSI
WAKE - Active high wake input - requires pull-down
resistor
Deep Sleep power state
DI
SPI_MOSI - SPI Master-Out-Slave-In port when used in
normal mode
DI (5V)
Unused
Connection
Connect to
Ground
Pull-down
Resistor
Connect to
Ground
2015 Microchip Technology Inc.
DS00001622B-page 5
5 Page 
CAP1128
4.0 COMMUNICATIONS
4.1 Communications
The CAP1128communicates using the 2-wire SMBus or I2C bus, the 2-wire proprietary BC-Link, or the SPI bus. If the
proprietary BC-Link protocol is required for your application, please contact your Microchip representative for ordering
instructions. Regardless of communication mechanism, the device functionality remains unchanged. The communica-
tions mechanism as well as the SMBus (or I2C) slave address is determined by the resistor connected between the
ADDR_COMM pin and ground as shown in Table 4-1.
TABLE 4-1: ADDR_COMM PIN DECODE
Pull-Down Resistor (+/- 5%)
Protocol Used
GND
56k
68k
82k
100k
120k
150k
VDD
SPI Communications using Normal
4-wire Protocol Used
SPI Communications using Bi-
Directional 3-wire Protocol Used
Reserved
SMBus / I2C
SMBus / I2C
SMBus / I2C
SMBus / I2C
SMBus / I2C
SMBus Address
n/a
n/a
n/a
0101_100(r/w)
0101_011(r/w)
0101_010(r/w)
0101_001(r/w)
0101_000(r/w)
4.1.1
SMBUS (I2C) COMMUNICATIONS
When configured to communicate via the SMBus, the CAP1128 supports the following protocols: Send Byte, Receive
Byte, Read Byte, Write Byte, Read Block, and Write Block. In addition, the device supports I2C formatting for block read
and block write protocols.
APPLICATION NOTE: For SMBus/I2C communications, the SPI_CS# pin is not used and should be grounded; any
data presented to this pin will be ignored.
See Section 4.2 and Section 4.3 for more information on the SMBus bus and protocols respectively.
4.1.2 SPI COMMUNICATIONS
When configured to communicate via the SPI bus, the CAP1128supports both bi-directional 3-wire and normal 4-wire
protocols and uses the SPI_CS# pin to enable communications.
APPLICATION NOTE: See Section 4.5 and Section 4.6 for more information on the SPI bus and protocols
respectively.Upon power up, the CAP1128 will not respond to any communications for up to
15ms. After this time, full functionality is available.
4.2 System Management Bus
The CAP1128 communicates with a host controller, such as an 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 4-1. Stretching of the SMCLK signal is supported; however, the CAP1128 will not stretch the clock signal.
2015 Microchip Technology Inc.
DS00001622B-page 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet CAP1128.PDF ] | |
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