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Questions tagged [vcc]

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0
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1answer
68 views

Whats the difference between one terminal power source vs. two terminals power source in circuit simulators?

I found a step down voltage regulator circuit online and tried to simulate it and noticed that it runs when I use the one terminal power source and it doesn't run when I use the two terminal power ...
2
votes
3answers
90 views

Possible Error in Microchip Datasheet

I am working on duplicating a product according to the Microchip datasheet. http://ww1.microchip.com/downloads/en/appnotes/00857b.pdf My question has to do with something I found in the schematic (...
0
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1answer
43 views

External VCC for USB cable while keeping data connection

I want to connect my android phone and arduino to create a fast and reliable serial connection. I've read that it is possible with USB OTG but i will need to charge my phone eventually. So i was ...
0
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0answers
54 views

SIM800L short circuit between VCC, GND and NET

I've soldered my SIM800L module like this. When I'm checking with multi-meter, I'm getting a short circuit between VCC, GND and NET. Why this is happening?
1
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3answers
151 views

Routing VCC with jumpers?

I'm trying to route a new VHF RF receiver (LO is 151MHz, RF is 162MHz). There's a pair of LC filters on this board, as well as a Si5351 oscillator and a crystal. From what I've read, an uninterrupted ...
0
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1answer
113 views

How MCU provides an output to pins [duplicate]

I would like to know how does MCU provide it's output current. here is a little drawing of my assumption (simplified) of how a pin is functioning when it is set to output. Basically it is a ...
0
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3answers
734 views

What is PVDD and AVDD?

I know VDD,VCC,VEE and VSS and what they stand for. But when I came across this circuit: I saw this. Those PVDD and AVDD terms? What to do they convey or stand for? This circuit is amplifier ...
0
votes
1answer
199 views

Wire to VDD or GND?

In the circuit below, there are four LTC485 ICs, one input (left), three for output (right). Pins 2, 3 and 8 are going to +5V, as well as GND. So where should I connect them to? Should I wire them all ...
2
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3answers
101 views

Longest, thinnest trace length to decoupling capacitor before capacitor is effectively useless

I was told time and time again to always put decoupling capacitors as close to the IC pin's VCC as possible. Sometimes when I make complex boards, I try my best to put the capacitor lead so close to ...
0
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2answers
991 views

Logic Gate Power in Proteus

Can someone explain to me how you can power (vcc, vdd whatever) a logic gate in Proteus, with only the input and output pins being shown? Thanks in advance. The above is the circuit I want to ...
1
vote
2answers
358 views

DAC: Vcc or Vref determine resolution?

Does the resolution of a DAC depend on the supply voltage or on the reference voltage? How would the possible voltage levels be calculated if we have, for example, a DAC with Vcc = 5V, Vref = 0.5V and ...
1
vote
1answer
63 views

How to connect clean power to multiple pins

I’m more inclined with software than hardware, so there may be a simple answer I’ve missed somewhere. Most of the ICs I’ve been looking at require multiple VCC and VSS pairs such as cortex processors....
0
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1answer
64 views

How is this source actually connected in the circuit?

I have seen this way of connecting the source in a couple of books now but I still am not sure if I am getting it right. This is how I am interpreting it, I have a feeling I'm very much wrong. The ...
0
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3answers
249 views

Vcc decoupling, how to do exactly?

I understand what decoupling is needed, but I did not understand how it is applied. For example, in this scheme that I found, there are many capacitors at the output. (Is a DC-DC converter). Some ...
-2
votes
1answer
380 views

Biasing analog MEMS microphone [closed]

I am using a analog type MEMS microphone.(SMA120). Interface chip PCM2912 provi SMA100 data sheet PCM2912a data sheet PCM2912 product page not for new designs Could you kindly suggest me a proper ...
1
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2answers
346 views

msp430 launchpad PWR led blinking

I want to use MSP430 launchpad to control a switch working between 1.65V and 2.75V. So, I wanted to force Vcc value to 2V instead of 3,3V while it is connected to my PC. I connected Vcc and GND pins ...
0
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2answers
2k views

How to identify a VCC pin on PCB use digital multimeter?

I want identify a VCC pin in JTAG header on PCB use digital multimeter. The multimeter is entry-level model without continuity test mode, only Resistance mode and Diode test mode. The VCC voltage is 3....
1
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1answer
170 views

try to understand ground and power planes

I'm trying to understand how signals flows in the GND layer. Let's assume that I have 4 layers PCB: Signal GND POWER Signal The CPU connect to the GND layer with VIA and I want to know, how the ...
1
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2answers
1k views

Why are Ethernet jack center taps connected to VCC?

Taking this schematic as an example: EtherTen Can someone explain to me why the center taps of the transformers (TXCT, RXCT) are connected to VCC? I've seen this connection in many (although not all)...
0
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1answer
119 views

What are the reasons why this analog to digital conversion is inaccurate?

I am planning to wire up the following sensor to an Arduino or a Raspberry Pi with a ADC. The following segment gives a wiring diagram and than says that "Analog to digital conversions rely ...
1
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2answers
306 views

jumper wires better for VCC or ground?

I'm trying to route 10 DIP ICs on a single-sided PCB, but because of my available pcb space, I cannot fit all 10 ICs in one single row. Instead, I lined them up in three rows. It seems that if I ...