6 Channel Capacitive Touch Sensor with 2 LED Drivers
Datasheet
Table 1.1 Pin Description for CAP1026 (continued)
PIN
NUMBER
PIN NAME
PIN FUNCTION
SMDATA - Bi-directional, open-drain SMBus data - requires
pull-up resistor
PIN TYPE
DIOD (5V)
DIO
DIO
DO
DI (5V)
DI (5V)
DI (5V)
OD (5V)
DO
OD (5V)
DO
DI (5V)
OD (5V)
OD (5V)
AI
AIO
AIO
AIO
AIO
AIO
AIO
Power
Power
3
SMDATA /
BC_DATA /
SPI_MSIO /
SPI_MISO
BC_DATA - Bi-directional, open-drain BC-Link data - requires
pull-up resistor
SPI_MSIO - SPI Master-Slave-In-Out bidirectional port when
used in bi-directional mode
SPI_MISO - SPI Master-In-Slave-Out port when used in normal
mode
SMCLK - SMBus clock input - requires pull-up resistor
4
SMCLK /
BC_CLK /
SPI_CLK
BC_CLK - BC-Link clock input
SPI_CLK - SPI clock input
Open drain LED 1 driver (default)
5
LED1
Push-pull LED 1 driver
Open drain LED 2 driver (default)
6
LED2
Push-pull LED 2 driver
Active high soft reset for system - resets all registers to default
values. This pin contains an internal 50uA pull-down current.
ALERT# - Active low alert / interrupt output usable for SMBus
alert and SPI interrupt
BC_IRQ# - Active low interrupt / optional for BC-Link
7
RESET
8
ALERT# /
BC_IRQ#
9
10
11
12
13
14
15
16
Bottom Pad
ADDR_COMM
CS6
CS5
CS4
CS3
CS2
CS1
VDD
GND
Address / communications select pin - pull-down resistor
determines address / communications mechanism
Capacitive Touch Sensor 6
Capacitive Touch Sensor 5
Capacitive Touch Sensor 4
Capacitive Touch Sensor 3
Capacitive Touch Sensor 2
Capacitive Touch Sensor 1
Positive Power supply
Ground
The pin types are described in detail below. All pins labeled with (5V) are 5V tolerant.
APPLICATION NOTE:
For the 5V tolerant pins that have a pull-up resistor, the pull-up voltage must not exceed 3.6V
when the CAP1026 is unpowered.
APPLICATION NOTE:
The SPI_CS# pin should be grounded when SMBus, I
2
C, or BC-Link communications are
used.
SMSC CAP1026
9
Revision 1.1 (08-05-09)
DATASHEET
SMSC [ SMSC CORPORATION ]
