Datasheets are the primary documentation about components, describing their functionality and electrical properties.

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No datasheet for SunFounder ADXL345 - can I use a datasheet for the same part number from a different manufacturer?

I'm just getting started with electronics (with Arduino) and have bought this SunFounder accelerometer with part code ADXL345 from Amazon. My problem is I can't find a datasheet anywhere from ...
2
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1answer
31 views

Howe to do a sam3x single channel ADC conversion

I have a Sam3x (Arduino Due hardware, but I don't use the Arduino IDE or libraries, and I don't use the Atmel libraries, just the register interface in sam.h). I have multiple pins configures as ADC ...
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0answers
37 views

Function of the MB8264A-12 memory chip

I am not actually trying to "do anything". I am new to electronics and I am just learning. I have been playing around with the MB8264A-12 memory chip and trying to learn how the chip operates using ...
0
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1answer
38 views

ST L4 series datasheet specifications and 1 wire

When you open STM32L476 specification on the The DFSDM peripheral supports (42/232) it says that "Manchester coded 1 wire interface support". Does this means it supports 1-Wire bus like for DS18S20 or ...
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0answers
19 views

Can't find TC117HS and RX28 data sheets

I am trying to adapt an RC car to control it with an arduino. In order to do that I am trying to understand the PCB. In the car PCB, there are: one "RX28 TXM ZYX13AA" with 16 pins two "TC117HS ...
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0answers
37 views

Li-ion protection circuit: MOSFET connection

I've checked a lithium ion protection circuit and found out that the D1 and D2 terminals from AO8810 are connected: But checking AO8810's datasheet I find that the MOSFET's drains are internally ...
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2answers
63 views

finding old datasheets

I am reverse engineering a old circuit board, probably from the late seventies (specifically an Enteron sk-1600-a industrial controller), And I am having trouble finding data sheets. Firstly I am ...
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1answer
34 views

Triac Datasheet/Design Questions

1) How do I choose the resistor for a triac? I saw this design in the opto-isolator datasheet that I'm using. I thought I'll just change the resistor value based on the gate characteristics of my ...
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1answer
68 views

Intel 8259A: why use A0 when there's nothing to address?

I am in the process of writing a driver for the Intel 8259A PIC and using the corresponding datasheet for reference. The datasheet contains a picture of the controller and its connection to the ...
3
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1answer
41 views

Intel 8259A: mysterious T bit doesn't fit the pattern

I'm implementing a driver for the Intel 8259A PIC for x86. To do this properly, I am reading the Intel 8259A PIC Datasheet. It is halfway comprehensible even for someone who approaches controller ...
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2answers
76 views

What is the max current that this circuit can handle?

I'm making a simple project. For me, it is recommended that the output current is 1.5A. But it's OK if it is 1A or 0.5A. For voltage regulator: Datasheet says that the output current is up to 1.5 A. ...
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1answer
70 views

datasheet dimensions

I am new to reading measurements in datasheet. I am drawing PCB layout of IC LT1761 for my circuit. What I do not understand is what does REF refer to in the datasheet (attached figure)? As far as I ...
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3answers
124 views

Transistor data for values other than the data sheet

I've been reading about transistor saturation to drive 3pcs of 1W LEDs in series from a 12V supply via a TIP31C. I was assuming I would need a Power resistor to balance the voltage drops as the LED ...
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2answers
85 views

Open loop voltage gain in a datasheet

Here is a datasheet for LM324: https://www.fairchildsemi.com/datasheets/LM/LM2902.pdf It says: Large DC Voltage Gain: 100dB Does that mean the "open loop voltage gain is" 100000? Is "Open loop ...
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1answer
37 views

Determining type of the transistors of an IC from its data-sheet

Does this comparator consist of BJTs?: https://www.fairchildsemi.com/datasheets/LM/LM2903.pdf From its schematic diagram they are drawn like that. But I am not sure if it is the case always. I mean ...
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2answers
55 views

Question on LM2577

I have a hard time fully understanding the datasheet of LM2577. I bought this product that has a LM2577 in it and the specifications indicated by the seller that it can have a maximum output current ...
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0answers
22 views

understanding FPGA datasheet: access speed to io lines [duplicate]

I am looking for the right fpga chip for a project. Crucial is the speed at which the fpga can access the physical gpio lines of the chip in order to realize a parallel interface. As I could not find ...
0
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1answer
78 views

Upgraded 10 turn potentiometers don't work whereas the original 1 turn potentiometers do. Why?

I bought this adjustable power supply kit and successfully assembled it. I wanted to upgrade the potentiometers to 10 turns so I could have fine control over the current and voltage limits set. Both ...
3
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1answer
64 views

AVR external interrupt triggering by the falling edge: for how long should I keep signal low to guarantee triggering?

The question header appeared to bee too long. I'm sorry for that. So I have a schematic generating a short LOW on INT0 pin of ATmega48PA. From the simulation I figured out that the LOW level will be ...
3
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3answers
52 views

Finding maximum source impedance for A/D converter (SAM3X8E ARM Cortex-M3)

I would like to find out what is maximum recommended source impedance for A/D converter on Atmel SAM3X8E ARM Cortex-M3 microcontroller. I tried to follow the example of this excellent answer, which ...
6
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1answer
76 views

MOSFET power dissipation calculations - Diodes Inc. datasheets

Looking at Diodes Inc. datasheets, I am having trouble following their power dissipation limit calculations for their MOSFETS. E.g. for DMG4496SSS http://www.diodes.com/_files/datasheets/ds32048.pdf ...
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2answers
76 views

MOSFET Heat dissipation question

I'm designing an RGB LED strip driver, and for the MOSFETS for the PWM power switching I'm looking at using the PSMN022-30PL. It has a voltage limit of 30v, and can supply up to 30amps, which is more ...
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1answer
56 views

How high is the TLC5940?

I've got some TLC5940 PDIP package ICs coming in the mail in a couple weeks or so, and in the meantime I'm designing a couple boards for them. I'm trying to figure out if the TLC is short enough ...
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2answers
290 views

Can I connect many SX1272 (LoRa) based devices to a gateway?

Simple question: Is SX1272 chip by Semtech capable of sending data to LoRa gateways? I'm a little bit confused about LoRa and LoRaWAN. What is the difference?
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2answers
92 views

Bridge rectifier - min. required protective resistor

Looking at the datasheet for a MYS80 bridge rectifier, at the bottom it states Min. required protective resistor is 8 ohm. I could not find much information about a protective resistor in regard to ...
6
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4answers
932 views

What does “V.A.” mean in datasheet dimensions?

I'm looking at a datasheet for an LCD panel (pdf link to datasheet). I don't understand these two encircled dimensions: What does the acronym "V.A." mean for these dimensions? I have referenced a ...
1
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1answer
99 views

Why are properties of components often given at 1 kHz?

The title pretty much sums it up. Aside from DC, why are the properties of components often listed at 1 kHz? I keep hearing that it is a "standard", but why 1 kHz? This seems to be pretty common in ...
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1answer
176 views

SX1272 - LoRa - What is the minimal schematic (needed capacitors/resistors) to use that device?

I'm interested in SX1272 by Semtech. It's a LoRa modem. I'm not the best at reading datasheets. Maybe it's because of my poor English. I wonder what is the minimum schematic of such a chip? What ...
0
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1answer
118 views

Information regarding old AB (Allen bradley) potentiometer JAIN056S102MA

i was looking for information (datasheet) regarding this old potentiometer from 1962 on the internet, JAIN056S102MA type J, 1k-ohm from Allen Bradley and i was not able to find any information about ...
0
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1answer
52 views

NJM2072D Application Questions for Audio Detection Circuit

I am building an audio switch with channel priorities. I will use this in car events where we communicate car-to-car on FRS radios. A few of us also use 2 meter amateur radios for longer range ...
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2answers
165 views

In a circuit with the TI TPS61165, how was D2 chosen?

Looking at datasheet for the TPS61165, I don't see how they chose D2 - it looks like it will only work if the voltage supply is above 12v due to this diode, but the chip's input range is 3-18v. I ...
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6answers
433 views

Reading dimension in datasheet

This is my first time making pcb layout. I am also quite unfamiliar with datasheets. I am using DS90LV019 (the figure is attached below). What is the actual length of this IC. Does ...
1
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1answer
63 views

Where are details regarding peripheral configuration for STM32 controllers in datasheets?

I have recently begun working more with STM32 processors coming from the more simple Atmel 8bit variety. The Atmel datasheets are very nicely laid out -- specifically speaking to how they provide ...
2
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2answers
192 views

What is LED spatial distribution?

I was going through a 5mm blue LED data sheet and found this diagram in it. Couldn't figure out what it is.
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1answer
41 views

Currents confusion in a JFET datasheet

I am analyzing a JFET. The datasheet has both information about the currents Igss and the maximum of Ig. I know that the Igss is a the reverse current in the PN junction but I can't explain myself ...
0
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1answer
43 views

Input Impedance Question

As I look at the Datasheet of a differential amplifier for input impedance, i see below statement. 0.8||2 for Differential. 0.4||2 for Common mode. What does GΩ||pF mean?
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1answer
64 views

Hashtag Beside Pins names [duplicate]

What does Hashtag (#) means when it's added beside some pins names in datasheets..like WE# in the flash memeory pinout or RI# in RS232 FTDI datasheets??
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1answer
98 views

Voltage follower with a RF signal

I have a RF signal up to 50 MHz coming from a VCO which I want to use on a different impedance circuit. Without any adaptation the signal go down quickly when i raise the frequency because my load is ...
2
votes
1answer
135 views

Need help understanding how to calculate the R value for LD1117

I am really trying to understand how to use adjustable voltage regulators such as the LD1117 sold by sparkfun. I had a look at the datasheet they provide in the product page but it points me to a ...
1
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1answer
385 views

SRU-12VDC-SD-C vs SRD-12VDC-SL-C

I'm following this guide [1] to made a Z-Wave compatible doorbell and it requires a SRU-12VDC-SD-C relay. I know nothing really of electronics and have found a SRD-12VDC-SL-C relay on Amazon [2] ...
6
votes
1answer
194 views

Multiple diodes, or single Zener diode?

In the datasheet for the MAX15500, it says I need to use several diodes in series: ... to ensure a voltage difference of 2V to 3.5V from AVDD to AVDDO and from AVSS to AVSSO. Is seems to be ...
3
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1answer
113 views

part identification

If possible. I would like a datasheet for the large IC pictured here, I havent found anything on google yet, seaching:MXICZ101061
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2answers
72 views

What performance requirements are implied by the term “telecom applications”? [closed]

I've noticed the term telecom applications or just telecom in a few datasheets I've come across, and in the book I'm working through, the phrase "In high-speed dc-dc switchers for the telecom market ...
0
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2answers
119 views

How much current can this 74HC245 handle on each output pin?

How much current can this 74HC245 handle on each output pin? Is it 20mA, 35mA, or 70mA? I don't understand what the difference between output current, output clamping current, and supply current is. ...
0
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1answer
57 views

What is thermal resistance of SMD7530 LED

What is thermal resistance of SMD7530 similar to this photo (Or typical LED in this type): With this datasheet: Datasheet for SMD7530 I cannot find any thermal resistance in it's datasheet.
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2answers
106 views

What does it mean when “Adoption of MBIT processes” is listed as a feature of a component?

What is the "MBIT processes" and what does it mean when it's a feature of a transistor like below?
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2answers
95 views

Have bypass cap recommendations already taken derating into consideration?

Datasheets often specify specific values for bypass caps. My assumption is that these values reflect the actual value (after derating), however, I often see on evaluation boards the same nominal value ...
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2answers
68 views

Frequency of motor vibration with different voltage

I'm using a motor shown in the link below. http://www.adafruit.com/product/1201 The product page is not showing the detail of how the frequency of vibration changes with different voltages. I sent ...
3
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2answers
65 views

MOSFET/IGBT Current capacities and SOAs

I need to switch off a 20V 60A DC current electronically. I don't want to use a relay, due to the environment (vibrations etc.). It is not a switching supply, just a switch that turns everything off ...
0
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1answer
74 views

Understanding Schmitt Trigger from datasheet

I've asked this question before, but I don't think I worded it correctly, as I got answers to a question I didn't intend to ask... So I'm giving it another shot: I am having some difficultly ...