How does the battery / power-up check work on the PCD?
A 2,2 voltage of the battery is sufficient to keep the content of the SRAM memory of the PCD even if the PCD is not powered on with the 24VDC.
At power-up, the PCD checks if the battery or supeCAP voltage is less than 2.2. volt, and tests some patterns and signatures in the SRAM.
If one of those test gives an error the content of the SRAM is deleted, the PCD clock is reinitialized. If a Program Backup is available, a restore is done.
The entry "memory lost nn" is written in the History of the PCD where 'nn' stands for:
01: Bad or missing battery
- In older FW < 1.10.04 the error message in the history was "Media corruption" instead of "memory lost"
and the nn code was not implemented
- New restore option since firmware version 1.20.00 and PG5 2.1:
On PCD2.M5xx0 and PCD3.Mxxx0, systems where the program is stored on SRAM, it is possible in the device configurator of PG5 to enable a CRC check.
The test is done over the program or the program and the ROM Texts/DBs.
In case of CRC error, the program is restored and the entry "memory fail 10" is written in the History of the PCD.
If there is no program backup, and therefore it's not possible to do the restore, the History entry "memory fail 11" will be written.
PCD3 / Mxxx
PCD1 / M2xx0
/ Device Configurator
Last update: 28.05.2015 15:06
First release: 13.11.2014 12:20