Questions tagged [integrated-circuit]

An integrated circuit (IC) is an electronic circuit built onto a single plate of a semiconductor material, normally silicon. Modern ICs may contain billions of transistors and they have played a major part in the miniaturization and performance improvements of modern electronic systems.

Filter by
Sorted by
Tagged with
2
votes
1answer
76 views

100s of devices on SPI bus with daisy chaining - theoretically possible but who's done it?

I need to control 512 knobs digitally using 128 digital potentiometers. The AD5204 supports daisy-chaining but what do I need to be careful of when interfacing this with a ATmega328P? I plan to split ...
3
votes
1answer
112 views

What's the difference between 1kb(64x16) and 1kb(128x8) for EEPROM memory size?

In addition to the question in the title, I have the following subquestions: I'm guessing 64x16 means something like 64 cells of 16 bytes each. Is this accurate? What is the significance (if any) of ...
0
votes
1answer
123 views

Help identify IC with erased label by using pin connections in the schematic

I am reversing a board which some of its IC labels are erased by the manufacturer. I've drowned its schematic in the picture below. The label-removed ICs in the schematic are IC5, IC8, and IC13 which ...
1
vote
1answer
46 views

How do I use one output to block an input until that output turns off?

I have a device with two inputs, each with an associated output. I require a means of allowing only one input-output circuit to be active at a time. If a second input is activated while the other is ...
1
vote
1answer
30 views

Trying to understand Battery Chargers vol.2 [duplicate]

The answer by Bill dubuque was very helpful and got me to read the complete datasheet of MCP73831/2, but there is one thing from the datasheet that I don't fully understand and is the cause of lots of ...
-1
votes
1answer
24 views

DIP temperature Sensor with serial port [on hold]

I am looking for a temperature sensor which is in for of DIP suitable for breadboards and serial communication that is usable for Arduino. I am not after a resistive or an analogue sensor. I am not ...
0
votes
2answers
112 views

What tool produces this type of layout?

I don't under this layout figure (5.c) in pic attached. This is a screenshot from research paper in this link:- https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=7573442 Alternate link for the ...
0
votes
0answers
15 views

Accessing image register of PAW3516DK?

There seem to be quite a few tutorials on internet on how to access register array of an optical mouse that stores image data from the optical sensor (this, for example, or this or this) however, ...
1
vote
1answer
30 views

Relative difficulty between leading zero counting and addition

Consider a 32-bit or 64-bit ALU that must implement both count leading zeros and integer addition, with low latency (say a few cycles), implemented on a modern high frequency logic process. Which is ...
0
votes
2answers
54 views

555 IC Astable Mode - Does the voltage generally affect the frequency?

Sorry if it's been asked before, I'm asking to satisfy a curiosity. I'm new to electronics, and I'm messing around with the perennial 555 IC. I've been introduced to the following formula which allows ...
0
votes
0answers
39 views

Designing a rechargeable circuit for phone

I'm currently working on a project where I'm looking to design a circuit that will charge my phone by utilising a slim lithium battery that is rechargeable. I've achieved the rechargeable aspect by ...
1
vote
1answer
86 views

What is the point of inverting RAM output?

The 74LS189 is a 4 bit RAM IC. The datasheet specifies that the output of the chip is inverted. Thus, if you put 1011 into address 1, when you read back address 1 ...
0
votes
0answers
33 views

8-channel variable frequency PWM IC [closed]

I am looking for an IC capable of generating 8 square wave signals with different frequencies (duty cycle can be constant, eg. 50%.). The ICs I have found yet are 8-channel PWM ICs providing output ...
0
votes
0answers
57 views

Switch Like Microcontroller or Integrated circuit

I'm somewhat new to this, and just wondering what the best approach would be. I'm trying to make a device that would be put in the middle of 2 connectors with about 20 wires. Essentially I am ...
0
votes
0answers
20 views

How can I make my own USB Joystick Encoder PCB and my own program which allows me to easily edit what the buttons do on a PC [duplicate]

I have previously used an Arduino Pro Micro to make button boxes for my computer which do functions such as type my password or copy something. I was wondering how I would design my own PCB which does ...
2
votes
4answers
566 views

Use of Power Pins in ICs

This question might seem very basic, but it will help me a lot if someone can answer it from the basics! I have just finished my first year at college and there was a course on digital design, where ...
20
votes
8answers
7k views

This LM317 diagram doesn't make any sense to me

So this is the basic wiring for an LM317 as a voltage regulator, and very little of it makes sense to me. First off, if one pin is for my adjustment, why do I need \$R_1\$? \$R_2\$ will give me just ...
0
votes
0answers
21 views

Can a bad cell cause excessive heat in charging circuit?

Something I have noticed and am curious of. I had a cases where a lithium ion cell, is bad or dead and it seems to cause overheating in the IC chip on the charging circuit Today I was having issues ...
1
vote
0answers
47 views

Battery Monitoring IC communication via SPI

I am trying to use Max14921(Battery monitoring system) to measure voltages of 16 cells of a battery pack. I have used stm32f103c8t6 as mcu. The problem is that I could never communicate with IC. I ...
6
votes
1answer
100 views

What's the difference between 74LVC1G74 and 74LVC2G74, finally?

I always thought that number before G in the part number is a number of identical gates in the chip. 1G08 is one AND gate, 2G08 is two AND gates in one package. ...
0
votes
2answers
38 views

Series Stubs and Microstrip Technology

Why are series stubs difficult to realize in microstrip technology? I read this statement in some text about the realization of microstrip filters, in which the solution for this problem is that of ...
0
votes
2answers
53 views

Why does cmos inverter consume power while discharging load capacitance?

Consider a simple CMOS inverter. To calculate the switching power dissipation, we consider the case when capacitor is charged till by pmos as the current is drained from Vdd. But when it is being ...
1
vote
1answer
70 views

Problem with boost converter

I am currently trying to use the LMR61428 boost converter IC with the configuration in the attached schematic and having an heating problem with the inductor. The inductor gets very hot very fast even ...
0
votes
6answers
200 views

Do Computer keyboards have ICs?

I have always assumed that computer keyboards do not, in the typical case, contain integrated circuits. And also, now that I think about it, there must be a set of standard electrical (digital?) ...
0
votes
1answer
37 views

What is the notion of sub-IP?

all I am CS engineer, mainly dealing with massive IP(Intellectual Property) data using Helix Perforce. Hence, sometimes I have faced with difficulties about semiconductor jargon. What is "Sub-IP"? ...
0
votes
0answers
46 views

IC for audio amplification of 3W and 4Ohms 2 speakers with Raspberry Pi

I was using a PAM8403 amplifier with Raspberry Pi to run 3W 4Ohms 2 speakers but the sound is low. So I am thinking of building an amplifier circuit. Sound low means when I connected this to mobile ...
1
vote
0answers
18 views

Pin config for CIS scanner

I've salvaged a linear scanner from an HP scanner cum printer. The scanner senor model is CA4B94. It's got two portions on a single flat ribbon cable. One is for the motor, so I guess it's safe to ...
2
votes
1answer
51 views

Bypass capacitor in combination with ground plane

I read it is advisable that every IC has a bypass capacitor, as close as possible to VCC, going to GND. However, I'm wondering, as I want to create a PCB with a GND layer as second layer, can I place ...
0
votes
1answer
31 views

Grounding GPIO pins during 8051 programming

I'm trying to make a programmer for the 8051 microcontroller IC's, specifically the AT89C2051. I saw a circuit online (the blowit programmer) in which the unused GPIO pins are left floating. When the ...
-2
votes
1answer
64 views

Can't identify this Chip

I am new to this forum. I found these chips on old motherboard that i was going to throw away, I salvaged these chips but Google Search could't help me to identify these. Only Information i could ...
0
votes
1answer
30 views

Pulse width stretching of the 0 pulse with a constant T [closed]

I have a digital output with varying pulse sizes and I want to design an IC to stretch the 0 output for a constant T+ "0" pulse time (as in attached picture). I have tried using a monostable ...
0
votes
1answer
49 views

How to harden/prevent ESD in a circuit?

I've designed a simple circuit with three LEDs in series with a matching resistor, all powered by an IC. I want to make my circuit less susceptible to electrostatic discharge since it will be ...
0
votes
0answers
59 views

Simple parts to stop “phantom power” from entering circuit

I have a circuit here which can sometimes program a microcontroller. I think a big problem here is that "phantom power" is introduced in the circuit because when I'm ready to program it, I plug the ...
0
votes
0answers
23 views

ST VNH7070 current sense specification

I don't understand the way ST specifies their current sense pin in the VNH7070 H-bridge motor driver, see the datasheet below. How do I know what the current Isense will be? Why does the voltage ...
0
votes
2answers
61 views

3 to 8 line Decoder Not switching off LEDS

So i'm currently working with a SN74AHCT138N 3-8 line decoder and the whole point of this ciruit is to switch on and switch off a series of LEDS. I connected buttons to the inputs of the IC and LEDS ...
21
votes
2answers
4k views

Why do radiation hardened IC packages often have long leads?

What purpose do long leads serve?
0
votes
1answer
119 views

Help identifying SMD components

I am having trouble identifying some components in this circuit. I am not sure if these are commercially available or not, so that's why I am asking. The components are shown below: I believe this ...
0
votes
1answer
53 views

Can someone help me to identify the IC marked A105 T44A MUGL 0J2785 in the picture? Is it a kind of liquid sensor?

It's a 20-pin SMD chip on the right side marked A105 T44A MUGL 0J2785
0
votes
1answer
66 views

Battery is 12 volt and motor is 3.7 volt…will it work?

I have a battery that says it has a working current of 4.6A and rated voltage of DC 12V I need the battery to power a motor for a fan that says it has a voltage of DC 3.7V Will it work? What will ...
2
votes
2answers
183 views

How to measure high DC voltage by micro-controller with an integrated approach?

Goal is to measure DC voltages in the 100-500VDC range, safely with a microcontroller (e.g. Arduino) The particular application is to monitor the voltage of a large Lithium series parallel battery ...
2
votes
2answers
131 views

Can we represent circuit with only text?

We normally use circuit diagram to represent circuits. Is there any markdown language for circuits, so that we do not have to use images to represent a circuit.
1
vote
0answers
32 views

LED Chaser using counting IC

Total beginner here, I'm trying to build an "LED Chaser" circuit using an IC (CD4022BE) that counts to eight (from zero to seven, and then it wraps around and goes back to zero). Before trying to ...
9
votes
4answers
3k views

Will my circuit charge the battery and power Arduino?

I am currently attending High School, so I don't expect too much here. I simply want to know all the recommendations for this circuit (Capacitor values, etc). But I mainly want to know if this ...
0
votes
2answers
92 views

003V SOT23-6 What is this component

This IC produces 29.6 kHz square wave and there is no external components. What it can be? I looked at all codes and I can’t find it.
2
votes
1answer
62 views

Probing with oscilloscope causes current drop

We are testing a fabricated chip with expected output current of around 4mA which is then used to charge a button cell. The input is from a PV cell. However, when we attach an oscilloscope probe onto ...
5
votes
3answers
878 views

What is a Power on Reset IC?

I'm making a prototype based on the W7500P reference design, the latest version (updated 6 months ago) specifies the need for a Power over Reset IC. I do not understand the point of this component ...
0
votes
0answers
30 views

BQ2002, LM317 NiMH charging circuit. How to control the current output?

I have designed a charging circuit utilising the BQ2002 and LM317 for 2x 1.2V NiMH batteries, and it is to be charged using a 5V USB input, I need the output current to be between 550 mA and 1A. I ...
0
votes
1answer
92 views

What chips can be used to design an Anti-Counterfeit /Authentication circuit? [closed]

I am an intern within the R&D branch of a company that designs tools that must operate with low noise at extremely high external temperatures (upwards of 175C). My boss asked that I look into ...
3
votes
0answers
66 views

Texas Instruments SN502 [closed]

My father is Bob Cook, an engineer that worked at TI with Jack Kilby in the 50’s/60’s. He has in his possession an SN 502 IC given to him by Jack Kilby. How rare is this chip?
2
votes
1answer
37 views

Reading signal from 190v magnetic pickup

I am using a magnetic pickup to detect the phase and RPM of a rotating assembly. The magnetic pickup produces a pulse once per rotation when a ferrous interrupter passes the pickup. Dependent on the ...