Hi,
I would like to keep the real time clock running after power failure on the FEZ Panda, and noticed that in the schematic the VBAT (pin 19) is tied to VCC in the circuit. In the FEZ Domino this pin is exposed (pic attached). Has anyone tried to modify the FEZ Panda to have a VBAT? Or am I missing something?
Here is the FEZ Panda schematic. Seems if I locate the trace, and cut it, should be able to put a Shottky diode in place to block the battery from running the rest of the system during a power outage. Am I off base here?
you’ve missed the very important point; Panda does not have a RTC. The lower-pricepoint chip USBizi100 doesn’t have one, whereas the USBizi144 that is in the Domino does.
Yep, seen that, and if I do this I’ll model a show-and-tell on similar grounds, especially including my most recent “everything” daughterboard (i2c eeprom, RS232, and SD card). Unfortunately I have a green fez Panda from the pre-release sample batch so I won’t be doing a white board hack - well not for now If this one pans out, maybe I had been delaying any kind of soldering on that small pitch pins, but i did do some SMT soldering the other week for the first time (on this green Panda) so I guess an RTC is a worthy first-go !
I knew this would be a hack, AND I knew it was possible in looking at the datasheet for the LPC2387. I was just wondering if anyone has done this before. However, I’m now glad nobody has ruined the fun for me. ;D
Luckily I have a good microscope and tiny tip soldering iron…