Post Created date
line noise and unwanted flash corruption (SPI)
A slow rising regulator is a ticket to trouble. Brown out detection is good, and there for just the problem you are encountering. A uP supervisory chip, generally cheap, is also a...
Monday, 19 March 2007 - 19:25
5V I/O to 3.3V AVR?
Thormj Which Silabs part? In any event, their chips are typically 5V input tolerant and do have ESD protection. You could pull up the interconnections to 3.3V and leave off the...
Wednesday, 14 March 2007 - 19:21
I2C Issue
Check the SCL pin. Is it high when you get to the suspect code?
Tuesday, 27 February 2007 - 19:41
Dragon connector advice requested
There are 6 (3x2) and 10 (5x2) pin connectors most commonly employed in AVR projects. These are documented in the Studio program - look under Dragon. When you say "The controller...
Tuesday, 27 February 2007 - 00:14
Input pin threshold
Keep in mind that a digital input may chatter with slow moving analog inputs. Be sure to simply ignore the input for a while after the first transition from a '0' to a '1'. Also,...
Tuesday, 27 February 2007 - 00:02
ATtiny24 Temperature measurement
The spec isn't a typo and the reality isn't as bad as it seems. Temperature sensing is a side benefit of designing in a band-gap reference on the IC. The big error in temp offset...
Wednesday, 14 February 2007 - 20:21
debugWire Programming?
When I worked on the B-1 Bomber project, they told me that the plane doesn't fly until the documentation equals the weight of the aircraft. Nice to know that this phenominum has...
Wednesday, 14 February 2007 - 02:13
Using AVR for DC/DC buck converter.
Using 500 to 600 KHz is a good idea. The inductor doesn't need to be large and efficiencies approaching 90% in the regulator are quite doable and output filtering is easier....
Wednesday, 14 February 2007 - 00:48
debugWire Programming?
OK, The part comes from the factory with ISP enabled. To get to dW you use the ISP and to go back to the ISP requires using the dW. And you have to be in ISP enabled state to...
Tuesday, 13 February 2007 - 23:23
debugWire Programming?
OK, I appreciate the time you've all put into answering my question. JTAG limits are understood. I try to avoid multiplexing those pins on devices where JTAG has the possibility...
Monday, 12 February 2007 - 23:39
How can transfer data through telephone line?
Hooking up to the public switched telephone network should never be done without using a certified modem. That is asking for trouble. If just connecting two hobby boards in your...
Tuesday, 6 February 2007 - 00:34
Need exact 3.75V and 1.25V
RES, I read your post to mean you need 0.5mV accuracy in measuring a signal that will vary between 1.250 and 3.75. It is doubtful that a 10 bit ADC is going to work. Your spec...
Tuesday, 23 January 2007 - 18:12