![]() Maximum output current will depend on rp, 2040 load and a vcs voltage. ![]() ![]() This pin can be used to power external circuitry. This pin low 3.3 volt is the main 3.3 volt supply to rp 2040 and its io pins generated by the onboard smps. If the usb is not connected or not, powered vsys is the main system input voltage, which can vary in the loud range of 1.8 volts to 5.5 volts and is used by the onboard raspberry pi pico smps switched mode power supply to generate 3.3 volt for the Rp2040 and its gpios 3.3 volt enable connects to the onboard smps enable pin and is pulled high to vs through a 100 kilo, ohm resistor to disable the 3.3 volt, which also depowers the rp2040 short. This board has three extra serial wire debug port pins v bus is the micro usb input voltage connected to micro, usb port pin one. You can see all the pins are clearly labeled. Raspberry pi pico has two spi pins: two i2c pens, two uart pen, 16, controllable, pwm, pins and nine ground pins. Now, out of these 26 pins, 23 pins gpio0 to gpio22 or digital, only and three pins, gpio 26 to gpio 28 can either be used as digital gpios or as adc inputs. 3 volt compatible controller board rp2040, so the operating voltage on these gpios should not exceed 3.3 volts.
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