Datasheet

SPI inteface pins

If you want to use SPI instead, you'll be using the SCK, MOSI, MISO and CS pins

Other interfacing pins

The AD pin is used to select SPI or I2C interface, and if I2C what address to use. See the

wiring page for more details

The IRQ pin goes low when a pin is touched. We don't use it on our code examples, but if

you want to have an interrupt pin used, connect it to this IRQ pin and use active-low

triggering.

The RST pin is used to reset the chip, either in I2C or SPI mode. It's optional but using it will

make the system more reliable so we suggest it.

Sensor input pins

This is the part you touch - there are 8 individual capacitive sensor pins, called C1 thru C8.

On restart the system recalibrates them so don't touch these when powering up!

Sensor output pins

The L1 thru L8 pins are the LED driver/sensor output pins. The indicators are really useful for

debugging your touch sensor system, but you can also use the indicator output pins for

triggering some other electronics. Each L pin corresponds to the matching C sensor input.

These pins are 3V normally, and drop to 0V when triggered.