Questions tagged [texas-instruments]
A manufacturer of semiconductors, both discrete and integrated circuits.
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1answer
20 views
Android NFC library - Command not recognized
To access more than 2kb of data from TI Rf430 transponder IC, a custom command (0xC0) in specific format needs to be sent. On sending the custom command, command not recognized (0x01) is the response ...
7
votes
1answer
122 views
Why use marks on the PCB solder layer?
I was studying a Texas Instrument reference board and would like to understand some topologies and PCB routing techniques. The project is a 230-V, 3.5-kW PFC with >98% Efficiency.
Here's the ...
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0answers
26 views
flash a .BIN with openOCD
I'm using a TI micro controller TM4C1230C3PM to flash a .bin using JTAG and openOCD .i have a board with tag connection tc2050 , I have everything connected but when i open the command window of ...
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1answer
42 views
Embedded web server
I am working on a college project in which I want to embed a http web server on a TIVA launchpad eval board. I have been looking through the internet for any guidance on the subject but the ...
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1answer
24 views
altium TI webbench, populate footprint in schematic
I have exported a design from Ti webbench in Altium format. I have used "project-component links" to link up the schematic and PCB.
The PCB has footprints set but the schematic does not which causes ...
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1answer
73 views
How does soft start work in TI buck regulators?
I am planning to use "TPS54341" in my design.
I am curious about how the soft start circuit internally works in TI regulators.
The datasheet explains to how to use it, however, does not go in much ...
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vote
1answer
110 views
Systems similar to TI's PRUs [closed]
I have been working with TI's PRUs on the am335x, equipped on the BeagleBone Black. I would like to know if other hardware manufactures offer similar systems. I am doing my Bachelor Thesis on this ...
4
votes
2answers
226 views
DP83848 + STM32 & Failed EMC (massive spikes of 25MHz crystal harmonics)
So we've failed EMC two times now because of spikes of 25 MHz harmonics from 175 MHz to 300 MHz, especially 175 MHz, 225 MHz and 275 MHz with peaks easily 30-40 dBuV above noise floor measured with ...
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1answer
181 views
C Language Pointers Question [closed]
Not sure if this is the correct place to post a programming based question so will have a go anyway.
Attached below is a piece of code and a table where I have to fill in the blanks. Just to clarify, ...
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4answers
130 views
STM32F103C8T6 - I2C communication with TI FuelGauge BQ78350
I am trying to establish communication between TI BQ78350 FuelGauge and STM32F103C8T6 using I2C/SMBus. The following is the I2C configuration used for the standard HAL I2C library.
...
2
votes
1answer
60 views
LM2917 draws too much current
I built a prototype of a frequency-to-voltage converter using a LM2917 following exactly the "Minimum Component Tachometer Diagram" example schematic - just to play a bit and understand how it works.
...
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1answer
27 views
Diifference between INA827AIDGK & INA827AIDGKR
Whats the difference between the same package of the IC INA827 - INA827AIDGK vs INA827AIDGKR?
The datasheet makes no mention of any differences.
Except in in.element14.com
where INA827AIDGK is ...
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1answer
54 views
How are ESCs (for BLDC motors) different from Texas Instruments sensorless Instaspin kits?
I have never used an ESC before but are they current (torque controlled) or speed controlled? If we vary the load suddenly ,will it stop or it can identify the rotor position and maintain the speed ?
...
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2answers
108 views
Issue using pspice .lib in ltspice - Unknown Parameter
I received an unencrypted PSpice model of a TI Boost Converter (TPS43061) and I am trying to use it in LTSpice but I'm getting the following error and I'm not sure what I can do about it.
Unknown ...
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1answer
50 views
Making sense of TI power-designer sims
After a day of struggling with trying to simulate an LM2678 based buck converter (see: this post) another user suggested using TIs online power designer web bench tool to simulate. Selecting a design ...
1
vote
1answer
172 views
Relation between Mbits/s and MHz
I am trying to communicate with an ADC via SPI. In the datasheet, It is mentioned, that:
The performance of the ADC161S626 is ensured
over temperature at clock rates of 1 MHz to 5 MHz – DNL +0.8 /...
0
votes
1answer
199 views
Calculate voltage of a 16-bit differential ADC that gives a two's complement value
I am working with a 16-bit differential ADC and I would like to know the difference between this latter and a single ended ADC especially: How to calculate voltage from the ADC value ?
Is it like ...
0
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1answer
72 views
LM2596 Cin requirements
I'm going to use an LM2596.
My maximum input will be 40V to a fixed output 5V 3A.
I've read in the datasheet that for Cin you need 1.5x for an electrolytic capacitor. So 40V x 1.5 will be some 60V. ...
0
votes
1answer
58 views
LM2596 TO-263-5 or TO-263-6
Hi just a dumb question that I have to be sure.
I will be using LM2596
It is stated in its description: IC REG BUCK 5V 3A TO263-5
That its package is TO-263-5.
But on its package is TO-263-6, D²Pak (...
1
vote
2answers
51 views
Memory allocation of constants and statics in structure?
I am working on IIR Filter implementation where I am initializing filter coefficients and memory (form-2 w) memory as follows.
...
0
votes
1answer
140 views
What is the difference between MCU and TTL screens? [closed]
I'm trying to build a HDMI decoder board for a 4in 480x800 IPS display. I found an HDMI decoder board on adafruit(https://www.adafruit.com/product/2218) which says it works for most 40pin TTL displays....
3
votes
1answer
317 views
Symmetric vs Asymmetric PWM
I am working on Control of Power Converters, I was reading TI's piccolo DSP ePWM guide and came across symmetric vs asymmetric PWM, I have a good basic understanding about converters, DSP and all.
...
0
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0answers
102 views
BQ24133, unable to charge the battery
I have designed the circuit around BQ24133 and in my humble opinion, chose the right components while following the datasheet. I had the PCB made, soldered the components and started testing. The next ...
0
votes
1answer
27 views
BQ76PL536A: Stopping measuring voltages and temperatures
I am testing a BMS design with multiple slave boards each containing one bq76PL536A connected to a common CAN bus through a ATmega32M1 MCU and a ISO1050DW isolated transceiver. The problem I am facing ...
0
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0answers
29 views
External assembler function for digital signal processor
I need to create external function on TMS320C5515 Fixed-Point Digital Signal Processor around BFXTR command. I need to write some value directly into memory. I ...
0
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1answer
82 views
differential ADC with a potentiometer in the positive input and grounded negative input
i have a problem in reading values from ads1672(datasheet). i setup this circuit:
the Reference voltage is +3.V (REF5030-TI page)
when potentiometer is @ +1.6V (i measured this by multi-meter) this ...
0
votes
2answers
62 views
what will happen if i don't use amplifier before my differential ADC
i have ADS1672Datasheet from TI. in it's datasheet circuit that is recommended for differential interface is:
but i want to remove amplifier(THS4520 datasheet-it's a Fully differential amplifier) and ...
0
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0answers
57 views
Identify TI motor driver IC (from old HP printer) or its control protocol
For fun, and as an exercise in reverse engineering junk hardware, I am trying to understand the internals of an HP DeskJet 840c printer from 2001.
Specifically I am trying to understand how the motor ...
0
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0answers
63 views
LCD colors are incorrect: problem with single line resistance?
I have developed a carrier board for a TI AM3358 system on module (SoM) from goembed. To the carrierboard is a 7 inch TFT LCD screen connected with parallel communication.
When I connect the LCD ...
0
votes
0answers
165 views
Why does this buck boost with dual MOSFETs fails output at certain input voltages at light load?
Buck boost design
A buck boost converter for 11A 45V output and 33.0-55.0V input has been designed using the Webench Power Designer. The LM5176 based PCB design was adapted for dual MOSFETs (4 times ...
0
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2answers
73 views
How do I compensate for Exponential decay in an op-amp circuit
Using an oscillator, I want to provide a square wave input to the second opamp circuit shown in the provided link(But using IC741 instead), the problem is in s domain:
I get a voltage input of 1/(s^s+...
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0answers
92 views
How to use Logic Analyzer and Event Viewer in Keil uVision with TM4C123GXL launchpad
I am using Keil uVision5 for programming TI launchpad TM4C123GXL with TIVA WARE Library.
How to use Logic Analyzer and Event Viewer in Keil uVision ?
While in a debug mode; I tried to set up ...
0
votes
3answers
151 views
Can't identify HT74 Texas Instruments smd chip
I'm trying to find a replacement for this burned out chip, but I'm bit confused which one do I need. Thisi how it looks like:
According to this datasheet, there are several HT74 chips in SSOP and ...
0
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0answers
114 views
TI TM4C1294 UART on Port C problem renders the board un-programmable
In the aforementioned board, port C is 8 pins in which 0-3 are used for JTAG (So 4-7 should be GPIO available right?). I am using the following code:
...
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0answers
114 views
MCU wakes up from sleep periodically
I'm facing a weird behavior on SOME boards based upon CC3220SF.
Scenario
I have 20 units of my custom PCB, designed following the Design Reference Guidelines from Texas Instruments and - like they ...
1
vote
0answers
64 views
Power sequencing with LDO without enable pin
What is the right way to provide a power sequence using LDO (or any other power source) without the enable pin?
I'm using DAC7718 from Texas Instruments and it require a quit complex power sequencing:...
1
vote
1answer
77 views
Unknown TI microcontroller identification
80-pin QFP package, has JTAG, UART, connected LCD. Powered by 3V Li battery.
Package marking: 80AGL 10A2K.
Can't find anything similar on TI's site and google.
2
votes
1answer
104 views
LM3466 circuit symbols, SEN/SRC to ground?
I'm reading the LM3466 datasheet (page 9) and am confused about the symbol downstream of the SEN/SRC pins and R(sen). Is this a ground symbol? If so, why do they use multiple different ground symbols ...
1
vote
0answers
167 views
Problem with ATmega328P when used with DRV8302 gate driver
I am developing a motor controller for a 48V BLDC motor. For this, I am using the ATmega328P microcontroller in combination with the DRV8302 gate driver from Texas Instruments. It uses a simple ...
1
vote
1answer
97 views
Distinguish between hardware or firmware issue
I'm writing a firmware for CC3220SF from TI using a custom board I've designed. I'm facing a weird behavior and I'm not sure if it's hardware or firmware related.
Here I'm looking for some hints ...
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votes
0answers
89 views
High/low order of the 4 select inputs of a 16-to-1 SN74150 MUX
I'm looking at a Texas Instrument Data sheet for an SN74150 16-to-1 MUX but I can't find which of the select inputs (A, B, C, D) is the higher order and which is the lower order. Does anyone know ...
0
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1answer
132 views
TI SN65HVD75 RS485 is not working while transmitting
Now I am doing a project with TI SN65HVD75 RS485 and nrf52832.
The project is converting RS485 to ...
0
votes
1answer
126 views
How to select the model selector for TI IBIS model of DRA725?
Following is the IBIS model selector section for the DRA725 SoC in IBIS file.
Currently, I do SI analysis of DRA725 with Mentor HyperLynx SI, Intention is to select the right model selector. What to ...
1
vote
1answer
192 views
LMR62421 Boost converter output voltage drops periodically
I have tried to build a boost converter using a LMR62421 from Texas Instruments to get 21V at the output from a 3.3V input. To do so I used its datasheet (link above) but also I used the Texas ...
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votes
1answer
99 views
Difference between SN75451 and conventional gate?
I use a board where the designers uses a SN75451 chip. It is a dual AND gate chip with open collector output.
I am quite surprised as normally the 74xx09 would be used in order to implement AND gate ...
0
votes
0answers
93 views
UART Port on the TM4C1294 Board sends garbage
I am using the TI TM4C1294XL board's virtual COM port that comes on the ICDI interface. This is the code I am using:
...
0
votes
1answer
93 views
TI TM4C1294XL Programming Issue
I am working on a TI's TM4C1294XL LaunchPad with KEIL and I had a problem at the begining. I installed all the drivers for both USB and KEIL then I succesfully upload TI's blinky example to board it ...
0
votes
1answer
147 views
Interfacing 20x4 character LCD with TI TM4C1294 generates some random characters
I have a 20x4 character LCD connected to my TI TM4C1294 kit as follows:
Data bus to port A.
RS, RW and E pins to port L 0-2
I wrote this code in order to drive it:
...
5
votes
2answers
506 views
Frequency response of dual vs single op amp: OPA2890 vs OPA890
I am looking for an op amp to use as a unity gain buffer with a disable feature. The OPAx890 looks like a good candidate because it is unity gain stable.
I have noticed that some op amps labeled as ...
-1
votes
2answers
323 views
BLDC works on constant current, not on constant voltage
I'm trying to controll a 3-phase brushless DC motor (24V, 4000rpm) with the BOOSTXL-DRV8301 shield for Texas Instruments launchpad. The motor receives one of the following singals on each port (A, B ...
