Questions tagged [buffering]

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69 views

Interfacing a microcontroller digital IO

I'm working with some microcontrollers, and I'm quite confused about how to interface the digital I/O. I've already see some projects with opto-couplers on outputs, other ones with buffers, so I'm ...
4
votes
1answer
1k views

When do you need buffers/drivers on buses in a microprocessor design?

I was browsing Microprocessor Interfacing Techniques and found this pharagraph: The microprocessor's buses must connect to every memory and peripheral input-output chip in a system. All MOS ...
3
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2answers
1k views

How to configure DMA to receive variable length USART messages?

I am trying to receive USART messages on a microcontroller originating from PC which will command it to execute certain tests. I am using STM32F4, I chose to use DMA as messages on the same USART ...
0
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0answers
39 views

Double buffering on LPC1768?

I am trying to build an MP3 Player on a generic lpc1768 development board. I am trying to play 8bit 44.1Khz wav file using internal DAC. I am using elm chan FATfs and double buffering concept. I have ...
0
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0answers
47 views

Does the location matter when performing unbalanced to balanced source conversion for this scenario?

Below circuit shows the issue when the output impedance of a DC-like source V is not balanced when coupled to a Diff Input(differential input of a data-acquisition board). As you see as an example for ...
0
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1answer
280 views

Opamp Buffer output voltage offset

I am building a system which will measure and record the voltage of batteries. There are 8 channels in the system with each channel being capable of measuring 0-35V. The accuracy we have decided upon ...
0
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1answer
47 views

Do some microcontrollers require data to be loaded in temporary memory before programming?

When I programmed the AT89Cx051 series of microcontrollers, I didn't have to use special memory to program the data, but now even though I'm following the instructions in the datasheet (found from ...
0
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0answers
24 views

Are there any criteria or standards when choosing a buffer type for common mode noise interference?

I know the idea of balanced lines for obtaining better common mode noise rejection but in practice lacking information. When a device has large output impedance, by buffering the signal by a modern ...
0
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4answers
174 views

How can I modify this circuit for some hysteresis and better design?

I need to make a circuit even when the push button pushed and released very fast, the final output will stay ON at 12V for roughly a second. %10 accuracy for the timing is fine. An LED will indicate ...
0
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1answer
49 views

splitter design

I want to split the signal from my electric guitar to 6 amplifiers. Does this splitter design look legit? I want to use 6 fet op amp followers to do it. R2 - R7 are 47R to prevent oscillations (they'...
5
votes
3answers
600 views

Why do MCUs typically have so little buffering on the USARTSs?

I am currently working with Atmel AT91SAM7X256. It has a CAN i/f with multiple multibyte message boxes. However, the USARTs only have a single byte of buffering, which is a bit of a pain when I'm ...
0
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1answer
60 views

How video page flipping works

I'm working with Page Flipping and Tiled Rendering (all hardware based) but i cannot understand one aspect of page flipping technique. When you're at frame 1, you're rendering bank1 and working on ...
0
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1answer
55 views

A question about buffering and filtering a sensor output

I'm going to use a DC outputting 10k windvane and the manufacturer recommends it to use it with a buffer with some additional resistors. This is the paper where they recommend how to condition the ...
0
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1answer
592 views

VGA double buffer with block RAM

I am planning a low key game console for my own leisure, based on the VGA signal. I have implemented parts of it on breadboards with lots of wires, but it is very error prone, thus my move to the FPGA ...
1
vote
1answer
184 views

Read a common digital output from multiple digital inputs

I'd like to read a single digital output with two separate systems, each of which has a digital input. Both systems have a common ground. In principle, since the digital output is low-impedance and ...
2
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1answer
454 views

Opamp: capacitive loading when buffering a Reference

I need to drive a ratiometric current sensor ACS758xCB with a nominal supply current of 10mA. Due to the ratiometric nature of the sensor I would prefer to supply it from the reference voltage of my ...