RST pin on Omega2
I cannot find any documentation on the RST pin on Omega2 module.
Does anyone know what it do and how can it be used?
I found some documentation about this pin in the data sheet for the AR9331.
7.5 Power On Sequence
The AR9331 has an internal power on circuit
reset. when all power inputs, including
VDD33, VDD12 and VDD25, are ready, the
RESET_L signal; will be released from low to
high. This signal is connected to a digital
counter which controls the digital reset and is
released after 5 μs. When the digital reset goes
from low to high, the CPU begins fetching
instructions from the internal ROM or the
external SPI in order to boot the system.
--- end quote ----
If I understand this correct this is an output that can be used to hold external chips in reset until power is good and CPU starts.
The Omega2 uses an MT7688. The AR9331 was used in the now discontinued original Omega.
Anyone got an answer?
What is the difference between the two reset pins?
@Paul-Chidley Onion Omega2
RST pin is an active Low input for hardware reset
The datasheet of Omega2’s SoCs can be found here: Mediatek MT7688 Datasheet
FW RST pin is an active High input for software reset
See also in the official Onion Omega2 Documentation Onion Omega2
See also RESET BUTTON in descriptions of various Onion's Docks.