I have a customer that has a re-design of a board using the MPC5534.
The previous version used a 10MHz crystal and internal PLL for 70MHz and 80MHz operation. It functions over the entire temperature range with no failures down to -40C.
The new design uses an external 80MHz oscillator fed to XTAL and run in PLL-bypass mode. At -30C, the part halts. As it cools down, the output clock at ENGCLK starts to slow down until it stops.
1. Is it acceptable to drive EXTAL with a 3.3V (assuming VDDES = 3.3V). Or does the signal need to be attenuated or series resistor and/or capacitor coupling?
2. Are Erratas e1151 and e488 applicable to using an external Oscillator? (see attached)
3. Can we find out if what Fz and type of clock is used in the manufacturing test program by the ATE?