Industrial Shields PLC Arduino ARDBOX, Руководство пользователя

Страница: 30 / 39

Ref. 006001001300 Rev. 0: 30-08-2019
11.1 I2C pins – SDA/SCL
The I2C protocol is meant to work in a pull-up configuration. The I2C pins in the Arduino
Leonardo are not pull-up, so in order to work with the I2C an external pull-up resistor is
required. If it is meant to work as a GPIO at 5V, the switches must be set as I2C, (section 8).
These pins are not stablished with a pull-up or a pull-down configuration. The state of these
pins is unknown. If these pins must be used they require a pull-up or a pull-down
configuration. The Arduino board allows the pins to be set in a pull-up configuration. If not it
must be stablished an external pull-up or pull-down circuit in order to correctly work with
these pins.
12.1 11.2 Pin3
Pin3 is only referred to the input R5. If the switch configuration is in OFF position the pin Pin3
will be available.
This pin is not stablished with a pull-up or pull-down configuration. The state of pin 3 is
unknown. If using pin3, it requires a pull-up or a pull-down configuration. The Arduino board
allows pin 3 to be set in a pull-up configuration. If not it must be stablished an external pull-up
or pull-down circuit in order to correctly work with this pin.
12.2 11.3 SPI – MISO/MOSI/SCK
These pins are used for the GPRS module.
These pins are not stablished with a pull-up or a pull-down configuration. The state of these
pins is unknown. If these pins must be used, they require a pull-up or a pull-down
configuration. The Arduino board allows the pins to be set in a pull-up configuration. If not it
must be established an external pull-up or pull-down circuit in order to correctly work with
these pins.
13.
I/0 technical details
Digital Output Waveform