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F28377 PWM4A/PWM3A TX Voltage Level Issue

Hi Experts,

My customer is using F28377 for an solar inverter and meet an PWM4A , PWM3A  I/O issue. As picture showed: 

The PWM high voltage output not 3.3V, but around 1 v.

Customer are running the PWM at 50Hz carrier frequency and the rising time of PWM signal is ~5ns.

Customer are connecting this I/O direct to SI8230, an Silab isolated Driver.


I've checked the errata which have one similiar item:

GPIO: GPIO0–GPIO7, GPIO46, GPIO47 Shunt to VSS Due to Fast Transient
Sensitivity at High Temperature

Could expert confirm if this is the same? Customer need our support to resolve the issue and catch up their project schedule. Thanks.