So, I was looking at the schematics of the AS72651 part of the AS7265x board while debugging. Looking at this, there are two pins I don’t see in the AS7265x datasheet, but I do see in the schematics and vice versa. The names also don’t make that much sense, so I’m really confused.
Is there anyone who could look at this and help me? I might just be blind.
It’s about RST-ADDR and CS_SD in the schematic. And SLV1_RESN and SLV2_RESN in the datasheet.
RST-ADDR (in schematic) vs SLV1_RESN and SLV2_RESN (in datasheet):
It’s possible that RST-ADDR is a combination of reset and address functionality. SLV1_RESN and SLV2_RESN in the datasheet are likely used for connecting and resetting slave devices (AS72652 and AS72653) when using multiple sensors in the AS7265x family together
CS_SD in the schematic is probably referring to CSN_EE, which you correctly identified as being equivalent to CSN (Chip Select). This pin is used for SPI communication with the external flash memory…maybe the “SD” in the schematic is a typo (we do often use CS_SD for SD card detection on many devices…perhaps it just got copied incorrectly)
Thank you for the reply!
I just found something while moving on to the firmware for a moment. There are apparently two “generations” of this, and they swap pins and such. I’ll have to look a bit more into the details of it, because this is confusing. Here is what I came across: Readme AS7265x firmware.txt
Another document I found uses the CSN_SD pin for the EEPROM programming header.
There seems to be more to it, since they only talk about two pins being swapped, while four are from the way I look at it.
If I figure out more, I’ll add it to this post.
