Could you please double check the voltage on RESET# pin while executing sector protection command sequence and sector erase command sequence? Voltage on RESET# pin should be VID during sector protection and VIH during sector erase.
Thanks and Regards,
Thank you for responding to the my question. I’ve been out of town on family leave so I apologize for this late follow-up.
During the sector protect command sequence RESET# is pulled up to 12.0 VDC and then set back to VIH level when sector protect programming completes (sector data read = 01h). The RESET# is at the VIH level during the sector erase too.
Could you please tell us the status of the WP#/ACC pin?
If you go to page 12 of the datasheet, Note 4 tells the protection status of the sectors with regards to the voltage on the WP#/ACC pin. Also note that leaving the WP#/ACC pin floating or unconnected might result in inconsistent device behavior.