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UDRE issues
Maybe you should have an occasional pause in your test program (100ms after every 10 characters?) to allow Brays to catch up/resync? It's a less than perfect world we live in....
Monday, 26 July 2010 - 15:46
Will Atmega644p Automotive run well at 3.3V 11.0592MHz
...but don't bet your career - or the safety of my motor car on it please...
Tuesday, 20 July 2010 - 16:50
Regulator is overheating ....
...or abandon the 7805 and use a switching regulator such as LM2575T-5.0 - a few more components but at those load currents and with the same input voltage it will barely get warm...
Tuesday, 20 July 2010 - 15:41
Minimum current for input port
chanseng738 wrote:The formula given:- fscl100 kHz, min pull-up=(Vcc-0.4V)/3mA, max=300ns/Cb where Cb= capacitance of one bus line in pF. So, if my fscl=400 kHz, Vcc=5V, thus min...
Tuesday, 20 July 2010 - 09:59
DS1307 configuration ?
Hi David - yep, I can use a DS1307 as well. They work fine :) What I meant was that there is presumably a path in the code that doesn't set up/initialise the DS1307 - it assumes...
Tuesday, 20 July 2010 - 07:59
DS1307 configuration ?
din.gulu.er wrote:Quote:X1, X2 – Connections for a standard 32.768kHz quartz crystal. The internal oscillator circuitry is designed for operation with a crystal having a...
Tuesday, 20 July 2010 - 07:36
Minimum current for input port
chanseng738 wrote: The IC1 pin1 output is open collector, thus need pull-up resistor...and with a thread title of "Minimum current for input port" I'm completely confused...and...
Monday, 19 July 2010 - 15:13
2 AVR 644, 2 different temperatures with the same programm
RudiBe wrote: • ... • ±2 LSB Absolute Accuracy - absolute accuracy meens +-2 from the 1024 I think No, it means that you can't rely on the 2 least significant bits - so a...
Monday, 19 July 2010 - 14:12
Minimum current for input port
How are you going to sink 5mA into an AVR input pin? You can't - think of them as essentially open circuit inputs within the AVR. You cannot sink 5mA into one, whatever resistor...
Monday, 19 July 2010 - 13:30
2 AVR 644, 2 different temperatures with the same programm
<<The evaluation board with the sensors is one and the same for both 644. At the moment I change only the 644.>> Ah - now it makes sense. And the 3K difference is at what...
Monday, 19 July 2010 - 11:49
2 AVR 644, 2 different temperatures with the same programm
...and does your multimeter (assuming they are analogue sensors - you don't help by not saying) show a 3K difference?
Monday, 19 July 2010 - 11:12
Variable Frequency Signal
On some of the (motorsport) vehicles I work with, the standard ABS is made non-operational - so tapping into the system is no great risk. If I was trying to get the signal from a...
Saturday, 17 July 2010 - 09:37

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