I have this circuit with a MCU's USB host port hooked to a TUSB2036, the reset pin is controlled by the MCU, the "mode" pin is grounded so that it uses a 6MHz crystal.
The crystal is within spec and is connected to two 22pF load capacitors to ground and one series 1.5 kohm resistor to XTAL2, just like the datasheet recommends. (well actually they are supposed to be 27pF but I used 22pF).
According to my trace debug, and o'scope, the TUSB chip never really starts the clock, I am viewing XTAL1 and nothing happens
So I keep trying and trying again, every time the reset is asserted, the XTAL1 jumps to about 3 volts for about 10ms
Sometimes, a 55 Hz sine wave with about 500mV peak-peak appears after the rising edge on XTAL1
I've actually seen a 6 MHz sine wave once, so it's not hopeless
My question is, what circuit parameter did I violate? Should I swap out the capacitors for a lower or higher value?
