SR5 Issues #1
Description
SR5 has an important electrical issue that need to be addressed. It only affects the daisy sub-assembly and results in occasional corruption of data coming in from the "daisy" board.
The issue is that the CLKSEL pin of the ADS1299 chip on both the base DCMini and the daisy daughterboard are pulled high through a 10k ohm resistor. This prevents the daisy from accepting the incoming ADSCLK from the base ADS1299. An additional 10k ohm resistor footprint has been added to the base and the daisy to allow for a pull-down resistor to be populated on the daisy, resulting in a shared clock and uncorrupted data transmission.
Additionally, silk screen was pointing to the wrong pin 1 on the APDS-9253 which is also addressed
And the USB-C connector can now be populated on the front OR the back of the PCB which gives more deployment flexibility and connector stability in some folded deployments. When folded in half, with the USB-C connector populated on the rear of the DCMini, the connector is centered in the case which is much more aesthetically pleasing and allows for more connector stability once properly cased.
These changes have been implemented in the SR6 revision.