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Questions tagged [texas-instruments]

A manufacturer of semiconductors, both discrete and integrated circuits.

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24 views

System Clock Measuring with Logic Analyzer

I have just started to use a basic logic analyzer. So my question is absolutely beginner. My device is the TM4C123GH microcontroller. And I would like to capture the system clock operation. But I do ...
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1answer
53 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
26 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
40 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
44 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
43 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
167 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
107 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
32 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
38 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
44 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
104 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
207 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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0answers
59 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
19 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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26 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 ...
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1answer
47 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
58 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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45 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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61 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 ...
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0answers
131 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
63 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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59 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
105 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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0answers
78 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
98 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
52 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:...
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1answer
72 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.
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1answer
81 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 ...
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0answers
21 views

External Device Interfacing With AM1705 And Storing RAMDISK File

I made a custom board which runs on the AM1705 processor. so far everything works fine. the only issues I'm getting are regarding external interfacing like UART, ETHERNET, and SD-CARD at OS level. I'm ...
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0answers
133 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 ...
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1answer
92 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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36 views

CC3220SF: manually connect to AP

I'm using this function to manually connect to an AP, using TI's C Compiler, without any RTOS: ...
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0answers
75 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 ...
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1answer
100 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 ...
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0answers
15 views

CC3220SF generate AP but doesn't connect to networks

I'm puzzling over a behavior I cannot explain. I designed a carrier board for CC3220SF following the reference design by TI, especially for power supply and RF section: http://www.ti.com/tool/...
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1answer
81 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 ...
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1answer
156 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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1answer
83 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 ...
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0answers
58 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: ...
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1answer
74 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 ...
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1answer
119 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: ...
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2answers
477 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 ...
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1answer
121 views

Is AD8232 good for P wave, T wave, and QRS complexity analysis?

I am trying to do ECG signal analysis using AD8232. Would it be suitable to get P wave, T wave, and QRS complexity analysis? I will be using arduino and so 10 bit ADC. People use ADS1115 or so. ...
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2answers
241 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 ...
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1answer
295 views

I2C Write Operation on TCA9539

I am using TI's TCA9539 for some read and write I2C operation to control some signals on my test board (school project). Per TI, the write operation comprises of the following, "To write on the I2C ...
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2answers
199 views

I2C - Certain Slaves not Pulling the Lines down fully

I have a large number of boards deployed with a TI CC3200 microcontroller and a variety of sensors for an industrial monitoring application. I have been having an issue for some time now, on some of ...
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1answer
175 views

MSP430F169 BSL NAK (0xA0)

I have an MSP430F169 that I'm trying to program using the BSL protocol. I don't have a JTAG programmer. Unfortunately, the MSP430F169 responds with NAK (A0) even to the unprotected commands (except ...
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0answers
47 views

Error in Tiva C launchpad Schematic

I think I found and error in the schematic diagram for the Tiva C board . I was looking at switch 3 (SW 3) and I think the pin numbers are flipped. The switch is a C&K DPDT sliding maintained ...
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1answer
3k views

Why include a small resistance between op-amp stages

I have been reading through TI's reference material on constructing a current source. http://www.ti.com/lit/an/sboa046/sboa046.pdf In figure 52 there is a 150ohm resistor included between the output ...