Questions tagged [datasheet]
Datasheets are the primary documentation about components, describing their functionality and electrical properties.
741
questions
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Latching Switch Pinout
I'm planning on incorporating a latching switch into my design:
https://lcsc.com/product-detail/Electrical-Switches_XKB-Enterprise-XKB8080-Z_C318860.html I also found the corresponding datasheet: ...
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1answer
38 views
what is Vfb in this datasheet
Beginner here. I'm trying to read this datasheet, and I'm not sure what Vfb is or how it was obtained. See pages 19-20 in section 8.2. https://www.ti.com/lit/ds/symlink/lm3410.pdf
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Deriving Coupling Coefficient based on Parallel and Series Inductance (of coupled inductor)
Problem statement
I was wondering whether it's possible to use a coupled inductor (e.g. this) as a signal transformer.
However, these coupled inductors typically have a tradeoff between the ability ...
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3answers
32 views
Does AM26C32 leave outputs floating?
Does the AM26C32 leave outputs floating, by which I mean, when "off", is the output pulled to GND, or would I need to provide a pull-up/down resistor?
Where in the datasheet would this info be ...
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48 views
Holtek keyboard controller working with reversed diode
I am confused at a mistake I currently have in my setup. I am using this Holtek keyboard controller. Note how the letter Q is produced by connection between R0 and C1 (page 19). According to the ...
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1answer
175 views
PCB Footprint Design Dimensions
I am trying to make a Eagle library for a Micro USB B connector. The library is unavailable and I decided to make one with the datasheet dimensions provided.
But it is rather confusing.
The units are ...
0
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2answers
60 views
Phototransistor Datasheet Confusion
I am going through this datasheet of a photo-transistor from Fairchild Semiconductor.
Problem-1: I cant figure out the gain of the photo-transistor (like in other normal BJTs). There is something ...
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1answer
62 views
Calculating inductance values from transformer datasheet
I want to simulate this transformer using LTSpice:
This is a microphone transformer. To do a simulation in LTSpice I need to know the inductance values for the windings. The datasheet gives ...
asked Dec 9 '19 at 18:36
Anthropomorphous Dodecahedron
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2answers
59 views
datasheet register address is not in HEX?
I am reading the this datasheet for the CAP1188 touch sensor and can't figure out what these "register addresses" in the far left column mean. I am used to seeing HEX addresses in datasheets such as <...
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1answer
46 views
Maximum current drawn from a small 12V A23 battery?
How much current can be drawn from a A23 12V battery?
I've looked at the Energizer datasheet, this Wikipedia page and on this answer: Powering 5W generator with A23 but I haven't found the exact ...
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1answer
50 views
What parameter of this sensor necessary to decide about the required ADC resolution?
From the datasheet of this accelerometer, I need to decide about the adequate ADC resolution.
If my reasoning is not wrong the output noise floor of this accelerometer will decide the adequate ADC ...
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Why would a datasheet's typical application diagram vary so much from the layout guideline on the same datasheet?
In reference to this datasheet, if you see pg2 has the typical application and pg12 has the layout guide. Why would the BST/SS/TON pins be shown unconnected compared to the typical application? They ...
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1answer
55 views
How can I tell if an antenna is a dipole antenna
Background
I'm trying to select an antenna for an FCC/IC-approved cellular module, SIM7000A. Apparently, to meet IC modular certification, you need to select an antenna which has
a) equal or less ...
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40 views
How do I use this impedance converter? (AD5933)
I want to measure a complex impedance with this impedance converter. I have been trying to find out how to use it, and I am confused. I figured I should put my impedance between VIN (5) and VOUt (6), ...
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1answer
51 views
Why is there a big difference between the temperature parameters of these regulators with the same name?
I have two datasheets for the same TL780–05C regulator one from Texas Instruments and another from MOTOROLA. I'm looking at the data for the TO-220 packages.
I need to estimate the total junction ...
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4answers
780 views
What is the name of this current called in this regulator datasheet?
Which parameter in this data sheet is the default current flowing from the input to the ground regardless of the load current?
In my case an 12V input will be regulated to 5V by the TL780-05. So to ...
2
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1answer
39 views
Unknown “2X” and “3X” markings on package outline
I was checking the dimensions of a TO-263 transistor on its datasheet (page 8), when I saw something I could not understand. What do markings "2X" (over dimensions e and b) and "3X" (over dimension b2)...
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3answers
757 views
Meaning of “pulse duration” in transistor datasheets?
I have a somewhat basic question. Many transistor datasheets have something like this for the peak current:
pulse duration = 300 μs, duty cycle ≤ 1 %
What does pulse duration mean? Is it only the on ...
2
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1answer
47 views
How does a solar cell its relative thermal coefficient “alpha” expressed in 1/K relate to %/K?
Some times I see the relative thermal coefficient of solar cells Isc (called "alpha" or α) written as 1/K, other times as %/K.
...
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1answer
25 views
Reference manual & Datasheet
I am new in the world of microcontrollers and I want to know the main differences between a Datasheet and a Reference Manual of a microcontroller and when do I use one and when the other.
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1answer
34 views
DRV8889: Unexpected voltage drop at output
I'm getting some unexpected behaviors when it comes to the voltage and current I see at the AOUTx and BOUTx pins. I must be missing something from my calculations from the datasheet.
Right now, I'm ...
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3answers
79 views
How to model a real diode 1N4148?
In my university EE lab we were working with a 1N4148 diode to rectify half a sine wave and measure the RMS value of the current in a simple circuit. To the left is the circuit we had to make and to ...
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2answers
48 views
Using a Optocoupler - Determining Parameters
I'm looking at possibly using an optocoupler to drive a higher powered circuit from a lower powered one.
This is the device I am looking at: http://www.vishay.com/docs/83641/il755.pdf
The circuit I ...
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2answers
58 views
How to interpret data sheet for an RF 50 Ohm terminator, is it 2 Watt or is it 0.1 Watt
I am trying to find a suitable RF 50 Ohm terminator for my application. I think the following will work:
http://www.amphenolrf.com/media/downloads/7034/132360.pdf
I am a little uncertain though as ...
0
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4answers
52 views
Unknown “D” variable on datasheet's max pulse current description
I was reading the datasheet for an SFH4545 IR LED. In the "maximum ratings" category, the "surge current" value's conditions are: $$t_p=100\mu\text{s},\,D=0$$
What does the D mean? At first, I thought ...
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1answer
33 views
What is this “drive circuit” for CCD sensor referenced to?
I had a look at the TCD1304DG CCD sensor which I consider using in a project. The datasheet is pretty lucid, but I couldn't figure out what the following diagram is supposed to say:
Is this just a ...
1
vote
1answer
43 views
Help identifying pins in EVQV9C00116E rotary encoder
I'm trying to make a button box for a sim racing rig and need a few rotary encoders for menu browsing. I plan to connect it to an arduino but I can't seem to figure out how to wire things up. I have ...
2
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3answers
56 views
Brushless DC motor values at voltage other than nominal
I am currently using a maxon three phase BLDC motor (datasheet PN:412825) that is rated for 48 volts (see spec sheet below). I am running the motor at 18.5 volts (requirement for my application). I am ...
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0answers
76 views
What name have this strange logic gate? [duplicate]
Today I have looked over the port diagram presented in the datasheet for the Atmel 7810 controller (Chapter 13.2), in the logic diagram of the I/O ports, I noticed a strange logic gate, which I have ...
2
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2answers
58 views
Looking for gyroscope drift spec in datasheet
The product page of the BMI088 IMU makes the very impressive claim
The automotive-proven gyroscope of the BMI088 has an unmatched bias stability of less than 2°/h
However, I can't find this claim ...
3
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1answer
48 views
Additional V+ pin on ALD1106
I'm working with ALD1106 as part of a circuit I'm testing, but looking at the datasheet for the part, I'm confused by the addition of the V+ pin. It doesn't look like it's tied to anything in the pin ...
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1answer
24 views
Input range for TPA311x
I'm reading through the datasheet of the TPA311x family.
I'm looking for the input range for pins INPR and INPL but I cannot find this information. I see the absolute maximum ratings, but it's not ...
0
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1answer
48 views
ESD Protection diode polarity
I'm using the following ESD protection diode:
On the datasheet it says:
MOUNTING POSITION: Any
Does it mean I can assemble it at any polarity?
(switch cathode and anode connections)
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2answers
64 views
STM32F103rb datasheet mentions 4gb address space, while only 128kb flash and 20kb RAM?
I am trying to advance my way into the STM32F103RB, and I don't understand the address space mapping defined in chapter 3.2 in the the STM32F103RB datasheet.
It states:
Program memory, data memory,...
0
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1answer
61 views
Can someone provide me the function table for \$ 74xx184 \$?
In Practical Electronics for Inventors, Paul mentions of these as BCD-to-binary encoders and shows a method to cascade them, but gives no function table to see why it works.
On the net, I’ve able to ...
0
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2answers
57 views
How much current can I pass through an HCT4067?
I want to use this 16-channel analog multiplexer/demultiplexer (Datasheet: 4067) to pass the output current of a stimulation circuit through different channels. The output current is a square wave ...
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2answers
107 views
What does quiescent power mean and how I can find how much current the chip consume
I was checking this datasheet about a multiplexer. It says:
This device handles rail-to-rail analog signals and consumes less than
4μW of quiescent power.
Checking the tables below it says that ...
0
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0answers
35 views
How to use ESP-WROOM-32 to send wireless TX and RX commands from a PIC?
I want to have the possibility to send the commands of a PIC in a way that it's wireless and I thought it would be a good idea to use a ESP WROOM 32.
In the datasheet it has the following schematic:
...
0
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2answers
51 views
Can we calculate the upper bound of needed power from some information from datasheet? [closed]
This is a energy harvester product data sheet, and we can know some information below
https://www.powercastco.com/wp-content/uploads/2016/12/P1110B-Datasheet-Rev-4.pdf
1.\$V_{out} \$ current = 100mA
...
3
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5answers
947 views
STM32 cannot reach individual registers and pins as PIC
I used to work with PIC and now I need to use STM32 chip. I was using HAL library but it gave me some problems so now I want to use it without HAL_Library. There are some questions I could not get any ...
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1answer
49 views
Finding a gain bandwidth product using a test frequency
For GBP datasheet parameters of Op-amps, I have seen datasheets with test conditions like gain and Rl, but there are also datasheets with ftest as their conditions. How do we calculate the GBP of the ...
0
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1answer
47 views
What does % of Population mean in a datasheet graphic about voltage output
I was checking a 3-axis accelerometer sensor an I found out this one https://www.digikey.it/it/datasheets/analogdevicesinc/analog-devices-inc-adxl335
Reading the datasheet, on page 6 under TYPICAL ...
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2answers
82 views
What happens to the output voltage of an unloaded linear regulator
I need a linear regulator for a project, for current sense reasons I need to select a regulator that passes its quiescent current into the load.
Most regulators like this have a minimum load current ...
0
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1answer
49 views
Measurement of Quiescent Current and Operating Current in Gate driver
In datasheet they have provided two parameters named Quiescent Current and Operating current in which I am measuring quiescent current i.e, ground current flowing from the device VDD to GND , when ...
11
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3answers
1k views
Is Texas Instrument wrong with their pin number on TO-92 package?
The official JEDEC standard to number pins on a TO-92 package is the following:
But in many datasheets from Texas Instruments, this order seem reversed. For example, this is a screenshot from the ...
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1answer
36 views
Velostat sensitivity to temperature
Velostat and some other type of conductive fabrics change resistivity based on pressure, but I did not found information about its sensitivity regarding the temperature.
Is the velostat resistance ...
3
votes
3answers
177 views
What is initial contact resistance in relays?
I am reading datasheet of a relay. I see a term, initial contact resistance in relays. What is the definition of this parameter? Thanks.
0
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1answer
36 views
High/ Low level output voltage in gate driver datasheet
Gate driver datasheet mentions about VOLL and VOH with test conditions Iol=100mA
I am testing this using this setup by calculating value (ron of pmos is 7.05 ohms) of load to be placed, Is this ...
1
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1answer
24 views
Interpolating output specs on SN74LVC1T45 transceiver
Section 7.5 of the datasheet for the SN74LVC1T45 shows minimum HIGH and maximum LOW voltages for output lines of the chip. Values are given for several different Vcc values (e.g. 2.3V, 3V, 4.5V). ...
0
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1answer
67 views
Can I get 9 V out with a 12 V input from the attached regulator?
The 9V regulator in this datasheet has a 2V dropout voltage. However, in the electrical characteristics on Page 9, the datasheet says that you need 15V input to get a 9V output. Does that mean I can'...
