Extreme Hu DAC Range and Value

**mdeven** · 02-28-2003

You're the second person to ask a similar question.... So here goes....
Well, it stands for DIGITAL ANALOG CONVERSION....
Basically, in this context it is the glitch voltage....
It is the voltage you want to glitch the card with WHEN you do a power glitch....
In fact the DAC value controls a PWM pin on the ATMEL....
For a value of 1 it is high for 1 cycle and low for 255 cycles and repeats....
For a value of 2 it is high for 2 cycle and low for 254 cycles and repeats....
For a value of 3 it is high for 3 cycle and low for 253 cycles and repeats....
Etc....
The DAC steps the voltage up from 0v to 5v....
We have 255 values the DAC can take....
So you can assume that each step in DAC increases the glitch voltage by 5/255 volts....
So... the voltage resolution of a unlooper is 5/255 volts = 0.02 volts....
DAC = 0 -> 0V....
DAC = 1 -> 0.02 V....
DAC = 2 -> 0.04 V....
DAC = 3 -> 0.06 V....
Etc....
I hope this answers your question....
Mark

03-01-2003

**mdeven** · 03-01-2003

That's the perfect way to start....
I wouldn't have called that a simple question though....
Mark

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02-28-2003	#2
mdeven Status: First Prime (Moderator) Join Date: Feb 2003 Location: South Carolina, USA Posts: 741	DAC values You're the second person to ask a similar question.... So here goes.... Well, it stands for DIGITAL ANALOG CONVERSION.... Basically, in this context it is the glitch voltage.... It is the voltage you want to glitch the card with WHEN you do a power glitch.... In fact the DAC value controls a PWM pin on the ATMEL.... For a value of 1 it is high for 1 cycle and low for 255 cycles and repeats.... For a value of 2 it is high for 2 cycle and low for 254 cycles and repeats.... For a value of 3 it is high for 3 cycle and low for 253 cycles and repeats.... Etc.... The DAC steps the voltage up from 0v to 5v.... We have 255 values the DAC can take.... So you can assume that each step in DAC increases the glitch voltage by 5/255 volts.... So... the voltage resolution of a unlooper is 5/255 volts = 0.02 volts.... DAC = 0 -> 0V.... DAC = 1 -> 0.02 V.... DAC = 2 -> 0.04 V.... DAC = 3 -> 0.06 V.... Etc.... I hope this answers your question.... Mark

03-01-2003	#4
mdeven Status: First Prime (Moderator) Join Date: Feb 2003 Location: South Carolina, USA Posts: 741	That's the perfect way to start.... I wouldn't have called that a simple question though.... Mark

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02-27-2003	#1
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