@Vraj-Patel said in First Time Using SPresence, Simple Questions about Technicial Specs:
Product 1: How much current do the GPIO pins individually output when used as an output? What is the voltage of a logic 1 output on an individual GPIO pin? How much current should I be feeding into the GPIO pin if I use the individual pin as an input? What voltage should I be feeding into the GPIO pin if I use the individual pin as an input?
Good to hear that you have chosen Spresense for your project.
For question #1:
On this page you will find information on how to power the main board:
On GitHub you will also find the schematic. Please note that EXT_VDD is called ACP_PWR.
To summarize this, the document above states that it is recommended to use the battery connector to power the Spresense board.
But looking at the schematics you can see that the BATT_VDD is connected to ACP_PWR which is EXT_VDD through a reverse current block ic.
The GPIO on the main board (please be aware that this applies only to the main board, for the extension board the figures are different!) the GPIO voltage is 1.8V so a logical 1 when the pin is configured as output will be 1.8V.
The VIH voltage when the pin in is configured as input is minimum 0.65 * VDD18 (~1.17V).
Before you feed any voltage on any GPIO pin please make sure that you have configured it as an input otherwise the CXD5602 chip will likely be destroyed.
You'll find all the details in the technical manual for the chip CXD5602: https://www.sony-semicon.co.jp/products_en/spresense/PDF/CXD5602GG_technical_manual.pdf
Don't know, have no figures for now.
Hope that this will help you on the way.