Questions tagged [texas-instruments]

A manufacturer of semiconductors, both discrete and integrated circuits.

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29 views

How to configure a clock rate of 50 Hz with a prescaler with TI Microcontrollers?

I need to configure a display that updates its values with f = 50 Hz. Since the CPU works with 16 MHz and the prescaler has a max. value of 256, the min. clock rate I can compute is 62.5 kHz. How do ...
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1answer
121 views

Compiler optimization prevents code from running

I was trying to upload a simple code to my board Tiva C EK-TM4C123GXL but it didn't work. I found out that when I turn the optimizer off, the code works fine. This is the code for blinking the on-...
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8 views

TMS320F28035: Simulink model for the SMO or eSMO block used for sensorless FOC of PMSM

I am a student of BITS Pilani, Hyderabad Campus. I am currently doing my summer internship at Analogics Tech India Limited - Hyderabad. I am working on a project to create a Simulink model for ...
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2answers
130 views

Configuring fuel gauge IC (BQ35100) with USB-I2C converter

I want to use TI's BQ35100 fuel gauge IC for my circuit. As per this instructional video, I would need an evaluation board and a communications interface adapter to configure the IC. Could I just use ...
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0answers
25 views

TPS55165Q1 does not work in boost mode

I need a power supply that delivers 12v with an input between 8v and 35v. That's the reason I bought a couple of TPS55165Q1 from Texas instruments. I've made 3 different PCBs with a similar circuit. ...
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1answer
51 views

Buck/Boost converter TPS63070RNMT is not working properly

I am working on a Buck/Boost converter design which is based on Buck/Boost converter TPS63070RNMT. Below is the schematic design. All the selected components are as per the Section 9 of the datasheet. ...
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0answers
24 views

Is there a Energy Harvesting Power Management and Battery Charging EVM dev kit (e.g. BQ25504) with easily adjustable voltage thresholds?

I have a BQ25504EVM-674 Energy Harvesting Power Management with Battery Charging (EHM) development board by Texas Instruments. It fulfills my requirement of charging an energy store (e.g. supercap/...
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44 views

Generate ePWM with F28379D

I'm trying to generate an EPWM signal with my Launchpad from Texas Instruments. I want it to be 50 Hz with a pulse of ~1 milliseconds in order to turn a servomotor (SG90) to -90°. This is the code I ...
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39 views

how to enlarge the reading range between the 13.56MHz NFC reader and tags with ISO15693?

I use TI devices, DLP7970ABP and RF430FRL152H tag. In order to enlarge the reading range, I buy a power amplifier and a large antenna(430mm*330mm). If I only disconnect the original antenna on the ...
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2answers
84 views

Buck Converter won't switch properly

I'm trying to use TI's LMR16006 Simple Switcher Buck Converter to regulate 48V down to 5V on my circuit. I used TI's WebBench tool to calculate component values for their reference design, and had a ...
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2answers
46 views

High level present in a pin of a non-powered IC can damage it?

I'm using a TXS0108E to convert from 5V to 3.3V and vice versa. The schematic is below: In the datasheet, in section 6, I read the following: Voltage applied to any output in the high-impedance or ...
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4answers
509 views

Audio Conversion With ADS1243

How can I use the TI ADS1243 8-channel ADC to convert a line-level audio signal (ideally balanced) to a digital 24-bit (as stated on data-sheet) stream.
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1answer
26 views

Selecting switching regulator components based on cost and performance

I'm designing a PCB which requires 3.3V and 9V power regulation. Eventually I plan on building a fair amount of these boards, so I want to plan my design so I'm able to buy components in bulk if ...
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1answer
92 views

Will a buck converter allow current to pass through if Vin is less than the configured output voltage?

In general, will a buck converter allow current to pass through if Vin is less than the configured output voltage? Specifically, I'm reading the TPS54308 datasheet and I'm not seeing an answer to my ...
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0answers
42 views

Buck/Boost Regulator Problems (TPS63070)

Questions: 1.) Why do input voltages of 9v and higher cause the regulator to output voltages in the range of 1.2v to 2.0v instead of the configured 3.4v if a load is connected to the output when 9v ...
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37 views

TLC5940 SOUT/SIN signal broken after 4th daisy-chained IC

I have a PCB with 5 TLC5940's daisy-chained. The first 4 work fine, but the fifth doesn't work. The LEDs connected to that one just go on at full brightness and that's it. When I measure the SOUT to ...
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1answer
32 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 ...
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1answer
138 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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43 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
45 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
28 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
169 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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1answer
124 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 ...
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2answers
412 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
184 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
208 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
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1answer
61 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
28 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
79 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
176 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
58 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 ...
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1answer
175 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 /...
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1answer
280 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 ...
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1answer
121 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. ...
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1answer
105 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 (...
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2answers
59 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. ...
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1answer
180 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....
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1answer
446 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. ...
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154 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 ...
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1answer
32 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 ...
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1answer
112 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 ...
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2answers
66 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 ...
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0answers
80 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 ...
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191 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 ...
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2answers
94 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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135 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 ...
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3answers
188 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 ...
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148 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
122 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 ...
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0answers
77 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:...