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PDF CAP1088 Data sheet ( Hoja de datos )
| Número de pieza | CAP1088 | |
| Descripción | 8 Channel Capacitive Touch Sensor | |
| Fabricantes | SMSC Corporation | |
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CAP1088
8 Channel Capacitive Touch
Sensor with 8 LED Drivers
PRODUCT FEATURES
Datasheet
General Description
The CAP1088 is a multiple channel Capacitive Touch
sensor with multiple power LED drivers. It contains eight
(8) individual Capacitive Touch sensor inputs with
programmable sensitivity for use in touch sensor
applications. Each sensor automatically recalibrates to
compensate for gradual environmental changes.
The CAP1088 also contains eight (8) LED drivers that
offer full-on / off, variable rate blinking, dimness controls,
and breathing. Each of the LED drivers may be linked to
one of the sensors to be actuated when a touch is
detected. As well, each LED driver may be individually
controlled via a host controller.
The CAP1088 offers multiple power states operating at
low quiescent currents.
During the Standby mode of operation, one or more
Capacitive Touch Sensors are active and all LEDs may
be used. If a touch is detected, then it will wake the
system using the WAKE/SPI_MOSI pin.
The Deep Sleep mode of operation is the lowest power
state available drawing 3uA of current. During this
mode, no sensors are activethough all LEDs may be
used. Driving the WAKE/SPI_MOSI pin or
communications will wake the device.
Applications
Desktop and Notebook PC’s
LCD Monitors
Printers
Appliances
Features
Eight (8) Capacitive Touch Sensor Inputs
— Programmable sensitivity
— Automatic recalibration
— Individual thresholds for each button
Flexible Capacitive Touch Sense algorithm
Multiple Communication interfaces
— SMBus / I2C compliant interface
— SMSC BC-Link interface
— SPI communications
— Pin selectable communications protocol and multiple
slave addresses (SMBus / I2C only)
Low Power operation
— 3uA quiescent current in Deep Sleep
— Samples one or more channels in Standby
Eight (8) LED Driver Outputs
— Open Drain or Push-Pull
— Programmable blink, breathe, and dimness controls
— Can be linked to Capacitive Touch Sensors
Dedicated Wake output flags touches in low power
mode
System RESET pin
Available in 24-pin 4mm x 4mm RoHS compliant
QFN package
Block Diagram
LED1 LED2 LED3 LED4
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LED Driver, Breathe,
and Dimness control
RESET
VDD GND
Capacitive Sensing Algorithm
WAKE / SPI_MOSI
SMBus /
BC-Link
or SPI
Slave
Protocol
SPI_CS#
SMCLK / BC_CLK /
SPI_CLK
SMDATA / BC_DATA /
SPI_MSIO / SPI_MISO
ALERT# / BC_IRQ#
ADDR_COMM
LED5 LED6 LED7 LED8 CS1 CS2 CS3 CS4 CS5 CS6 CS7 CS8
Note: I2C is a trademark of NXP semiconductor. BC-Link is a trademark of SMSC.
SMSC CAP1088
DATASHEET
Revision 1.1 (08-05-09)
1 page  
8 Channel Capacitive Touch Sensor with 8 LED Drivers
Datasheet
List of Figures
Figure 1.1 CAP1088 Pin Diagram (24-Pin QFN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 3.1 SMBus Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 3.1 SPI Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 3.1 Example SPI Bus Communication - Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 3.2 SPI Reset Interface Command - Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 3.3 SPI Set Address Pointer Command - Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 3.4 SPI Write Command - Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 3.5 SPI Read Command - Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 3.6 SPI Read Command - Normal Mode - Full . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 3.7 SPI Reset Interface Command - Bi-directional Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 3.8 SPI Set Address Pointer Command - Bi-directional Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 3.9 SPI Write Data Command - Bi-directional Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 3.10 SPI Read Data Command - Bi-directional Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 4.1 System Diagram for CAP1088 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 4.2 Sensor Interrupt Behavior - Repeat Rate Enabled. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 4.3 Sensor Interrupt Behavior - No Repeat Rate Enabled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 5.1 Pulse Behavior with Non-Inverted Polarity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Figure 5.2 Pulse Behavior with Inverted Polarity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Figure 5.3 Pulse 2 Behavior with Non-Inverted Polarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Figure 5.4 Pulse 2 Behavior with Inverted Polarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Figure 5.5 Direct Mode Behavior for Non-Inverted Polarity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Figure 5.6 Direct Mode Behavior for Inverted Polarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Figure 6.1 CAP1088 Package Drawing - 24-Pin QFN 4mm x 4mm . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Figure 6.2 CAP1088 Package Dimensions - 24-Pin QFN 4mm x 4mm . . . . . . . . . . . . . . . . . . . . . . . . . 68
Figure 6.3 CAP1088 PCB Footprint - 24-pin QFN 4mm x 4mm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Figure 6.4 CAP1088 Package Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
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SMSC CAP1088
5
DATASHEET
Revision 1.1 (08-05-09)
5 Page 
8 Channel Capacitive Touch Sensor with 8 LED Drivers
Datasheet
Chapter 2 Electrical Specifications
Table 2.1 Absolute Maximum Ratings
Voltage on 5V tolerant pins (V5VT_PIN)
Voltage on 5V tolerant pins (|V5VT_PIN - VDD|) Note 2.2
Voltage on VDD pin
Voltage on any other pin to GND
Package Power Dissipation up to TA = 85°C for 24 pin QFN
(see Note 2.3)
Junction to Ambient (θJA) (see Note 2.4)
Operating Ambient Temperature Range
Storage Temperature Range
ESD Rating, All Pins, HBM
-0.3 to 5.5
0 to 3.6
-0.3 to 4
-0.3 to VDD + 0.3
0.9
58
-40 to 125
-55 to 150
8000
V
V
V
V
W
°C/W
°C
°C
V
Note 2.1
Stresses above those listed could cause permanent damage to the device. This is a stress
rating only and functional operation of the device at any other condition above those
indicated in the operation sections of this specification is not implied.
Note 2.2
Note 2.3
For the 5V tolerant pins that have a pull-up resistor, the voltage difference between
V5VT_PIN and VDD must never exceed 3.6V.
The Package Power Dissipation specification assumes a recommended thermal via design
consisting of a 3x3 matrix of 0.3mm (12mil) vias at 1.0mm pitch connected to the ground
plane with a 2.5 x 2.5mm thermal landing.
Note 2.4
Junction to Ambient (θJA) is dependent on the design of the thermal vias. Without thermal
vias and a thermal landing, the θJA is approximately 60°C/W including localized PCB
temperature increase.
Table 2.2 Electrical Specifications
VDD = 3V to 3.6V, TA = 0°C to 100°C, all Typical values at TA = 27°C unless otherwise noted.
CHARACTERISTIC SYMBOL
MIN
TYP MAX UNIT
CONDITIONS
DC Power
Supply Voltage VDD 3.0 3.3 3.6 V
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SMSC CAP1088
11
DATASHEET
Revision 1.1 (08-05-09)
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet CAP1088.PDF ] | |
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