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16F648A internal eeprom

 
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Joined: 16 May 2006
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16F648A internal eeprom
PostPosted: Thu Nov 29, 2007 9:00 pm     Reply with quote
I am using the internal eeprom of the chip to store data and found that very high percentage (> 10%, 3 in 20 chips) are corrupted after very short running time (around 1 month). The eeprom data stored when shipped and read only 1 or 2 times a day. The read/write function is CCS build in functions.

The power is a regulated 5V.

Any idea?
PCM programmer



Joined: 06 Sep 2003
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PostPosted: Thu Nov 29, 2007 11:30 pm     Reply with quote
Some silicon revisions of the 16F648A have problems with the eeprom
write operation.
http://ww1.microchip.com/downloads/en/DeviceDoc/80151M.pdf
The Errata says it's fixed in silicon revision A5.

What is silicon revision of your PIC ? You can find it by "connecting"
to the PIC with an ICD2 programmer.

For example, I have a 16F628A chip. (I don't have a 16F648A).
When I connect to it with the ICD2, the following messages are
displayed by MPLAB:
Quote:

Connecting to MPLAB ICD 2
...Connected
Setting Vdd source to target
Target Device PIC16F628A found, revision = Rev 0x6
...Reading ICD Product ID
Running ICD Self Test
...Passed
MPLAB ICD 2 Ready

Post the silicon revision of your PIC.
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