CH341a Serial Mode

**mmartell** · 06-17-2021, 12:53 PM

I'm trying to program a Metra Axxess ASCW, it's a unit that enables you to retain steering wheel controls when installing an after market stereo in your car. The newer units use a micro usb to program this one has four pins, GND RX TX +5v.

My CH341a programmer runs natively at 3.3v. My question is if I bypass the 3.3v regulator will the chip accept the 5v supply and will the TTL signals become 0/5v ?

06-17-2021, 12:53 PM	#1
mmartell Badcaps Veteran Join Date: Oct 2013 City & State: Windsor ON My Country: Canada I'm a: Knowledge Seeker Posts: 3,044	CH341a Serial Mode I'm trying to program a Metra Axxess ASCW, it's a unit that enables you to retain steering wheel controls when installing an after market stereo in your car. The newer units use a micro usb to program this one has four pins, GND RX TX +5v. My CH341a programmer runs natively at 3.3v. My question is if I bypass the 3.3v regulator will the chip accept the 5v supply and will the TTL signals become 0/5v ?

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