Questions tagged [texas-instruments]

A manufacturer of semiconductors, both discrete and integrated circuits.

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Op Amp Error Calculation

I am attempting to calculate the total error in an op amp (OPA2333 to be specific) that is used in a voltage sensing circuit. If I use the OPA2333 model in my SPICE circuit, are the errors already ...
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Texas Instruments IC 208017 - no datasheet or support [closed]

I have a repair to do on a portable 14v TV manufactured by Samsung, the model of the TV is: LT24D390SW/UX and the model of the control board inside the TV is: BN41-02152 there is also the same code ...
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TI Sitara Pass Variables from Application to Bootloader

How can I pass some hardcoded variables from application to bootloader to check whether the firmware is OK or NOK?
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Error while connecting to the target TMS320F2812 with code compser

I am trying to connect to my target:TMS320F2812 the first time after powering up the board,using code composer via JTAG but i am getting this error : What can i do to fix this? Please note that : I ...
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Can't find formula to calculate resistor values for a BQ34Z100

I am designing a BMS board using the BQ34Z10 fuel gauge IC. From the datasheet BQ34Z100 datasheet figure 8-3 I am unable to figure out how to calculate values for R2,R3,R4. I am designing the system ...
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Which variant of amplifier to use?

I am making a pressure sensor circuit according to page ten of the manual here. There are just too many types of the recommended sensor LMV324 available in the SOIC type. Can someone help me decide ...
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INA219- I2c bus weird behavior

I have a PCB assembly where I built the circuit in the schematic below. I did not start programming yet. I'm getting the weirdest problem. When I check the voltages in the SDA and SCL lines (which ...
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Why are there so many variants of an Op Amp? Which one to chose? [closed]

I am directed in a user manual (Page 10) to use the LMV324 Amplifier. But when I search on the net there are just too many types of this amplifier with a lot of different types of suffixes. I need to ...
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Somebody who own MSP432P401R User Guide?

Is there somebody, who can deliver me the user guide for MSP432P401R? I know, this question looks dummy. However the mentioned part lost support from the side of Texas Instruments, and they cannot ...
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TIDA-01513 Riso calculation

Can someone assist with getting the Riso value using the datasheet HV_batt = 400V ISO_NEG = 4.278V Rns1+Rns2 = 1.2Mohm Vref = 2.5V Rs2 = 5kohm Using the equation TI used, we get Riso = -68110.24 ohms, ...
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PCM5242 DAC: DSP Program and DSP Frequency for high sampling rates

I want to use a PCM5242 DAC (datasheet) in a project The DAC has a built in DSP core that I don't want to use for anything custom. The DSP can be programmed with custom code, or predefined codes in ...
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TI Microcontroller Programming Circuit

I am working on designing a pcb that will contain a TI TM4C1231D5PZ microcontroller. I have only ever used a launchpad before for coding, so I do not know how to get my program code onto a ...
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Pspice simulations

I have bee trying to use Pspice, however I cannot place any symbol on the schematic page. It gives me this error: Could anyone help please?
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Boost Converter Design with TL5001 PWM Controller

I am trying to design and build a boost converter with the TI TL5001 PWM controller, to convert 9VDC to 400VDC to supply a Geiger-Muller tube. This is my first boost converter with an analog ...
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LM139AD Comparator Negative Inputs

I am wondering if the LM139AD comparator from TI can tolerate negative voltages at its inputs. I see that it can operate from a dual supply and that a supply rail can be negative? Is the same true for ...
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DTC Code for TI C2000 Launchpad TMS320F28069M?

Is there some link or resource for code for Direct Torque Control of 3-Phase Induction Motor using the TI C2000 Launchpad TMS320F28069M?
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How to fix Texas Instruments DAC81408EVM Internal Oscillator error

So I'm working with Texas Instrument's DAC81408EVM (https://www.ti.com/tool/DAC81408EVM) as an external DAC for a project I'm working on. I'm posting here because TI's forum won't let me ask questions ...
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IVC 102 Integrator IC - Photodiode Simulation Issues

I am designing a circuit that integrates a signal output from an avalanch photodiode. The component I am using is the ICV102U. Before purchasing the IC, I want to run a few simulations using LTSpice. ...
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TPS9264x Synchronous Buck Controllers for Precision Dimming LED Drivers

I have some questions about TI's TPS92641. Please see below: 1.) Does anybody know the principle of Chopper OTA? there are no too much information in the datasheet. 2.) What's Quasi-hysteretic ...
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Adjustable LDO's - Voltage Input, Output, & Potentiometer Use

I am looking to use an LDO with a negative adjustable output voltage. I have found two products sold by TI that have similar schemes for setting the output through external resistors. I am slightly ...
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I2C slave pulls down SCL while doing nothing

I have an MCU (Texas Instruments tm4c123gh6pm) in which I have configured an I2C slave device. I have taken 3.3V from the MCU pin that provides them and connect them to two 4.7 kOhm resistors (to make ...
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I2C SCL goes low if using MCU GPIOs as pull-ups

I have an MCU (tm4c123gh6pm) in which I have configured an I2C slave device. At the moment I don't have resistors to wire the required pull-ups, so I want to use two of the MCU's GPIOs for this ...
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TMS320F28377S Unable to enter the SCI transmission interrupt

SCI peripheral initialization configuration is as follows: ...
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Evaluation Board DP83TD510E

I'm trying to create a demo based on 2 evaluation boards DP83TD510E-EVM using 10Base-T1L technology. Both boards are connected together via a 10 meter SPE cable and each board is connected to a laptop ...
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Proper grounding of a half open measurement bridge with zeroing variable resistor

I am designing a circuit to read a differential pressure sensor. The manufacturer gives the following diagram of the half-open measurement bridge: My understanding is that I am designing a circuit to ...
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LMH664 - Buffer Configuration

I am trying to use LMH6642MAX op amplifier in the inverting closed loop configuration (gain 3.5) for a periodic square input signal 20 kHz (2 Volts High, 0 Volts Low). The problem comes when I checked ...
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Temperature sensing with NTC circuit

I am reading through this document by TI on designing a temperature sensing circuit with an NTC thermistor. I'm having some trouble understanding the design steps though. Here are some snippets from ...
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How to calculate efficiency of TPS65581 Texas buck converter?

I am using Texas TPS65581 for designing buck converter where I need to convert 12 V to 3.3 V and 1.1 V. When I go through the datasheet of IC, I can’t find the efficiency for my requirement. For ...
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Why don't Li-ion battery charger ICs have balance charging feature?

I was looking for 2-4 cell li-ion chargers like the Texas Instruments' BQ25798 [datasheet] and many others of this class. They advertise that the IC can charge 1-4 cells, but balance charging is ...
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Buck-boost LED driver returning to Vin

I am working on a design involving driving a string of 22 LEDs in series using a constant current. The relatively high voltage required (~66V) has lead me to look into buck-boost LED drivers. I have ...
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Flashing TI Chips with OpenOCD

I'm trying to flash a CC2652 chip from TI with OpenOCD via Raspberry's GPIO (or SPI, or whatever suitable). This doesn't seem to straightforward, and I also have a Launchpad, which you can imagine as ...
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TLC555 design calculator

I need to generate a square wave at 600 kHz with the TLC555. In the datasheet (7.3.2 Astable Operation) TI advise us to use their calculation tool for the frequencies above 100 kHz. I downloaded it ...
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BQ40Z80 configuration

I have a board battery managment BQ40Z80 Texas Instuments. At the moment, I can send command to board, can read data from registers. But... I have a problem too. Now the board flag ...
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4 votes
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What's importance of finite state machines (FSM) with respect to embedded systems implementation?

I was studying a project that involves implementation of a digitally controlled bridgeless power factor correction (BL PFC) converter. It uses PWM to drive the gate driver of the MOSFET switch and ...
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CC2541 Interface with ST7789V based 1.14" TFT Display

I am working off a custom board having CC2541 from Texas as the Main Controller and a 1.14" TFT Display being controlled via ST7789V Drive IC. These two are connected over the SPI Interface. ...
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What does ADC SOC(start-of- conversion) in TI c2000 tms320f2802x devices mean?

I'm using TI C2000 f28027. In reference manual it's mentioned that this ADC is not sequencer based. Instead, it is SOC(start of conversion)based. What does that mean? Can anyone explain difference ...
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Code Composer Studio problem with fread() on c5502 chips/windows 10 [closed]

Problem: fread does not seem to work for TI tms320vc5502 cpus using any code composer studio on windows 10. I have tried with multiple installations to confirm this, I am currently using CCSv6. TI ...
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1 vote
1 answer
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Can't display characters on 16x2 LCD

Currently I'm working on a project where I want to display some data on an LCD. I'm using a MCP2221A to communicate with a PCF8574, which then sends the bits to the HD44780 LCD. How: I'm using the LCD ...
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How to calculate current value for DOUT and RIN pin in MAX3221E texas IC?

Hi Im going to use ferrite bead in the Dout and Rin pin in MAX3221E IC of Texas. How to determine current rating of the pins , thereby i can choose the current rating of ferrite bead??
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What is the term Flc in LM27402?

Hi while going through LM27402 IC, inorder to find compensate components of cc1,cc2 and so on, there is term called Flc, can anyone explain what it is?
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CDCLVC1104 output logic status

I have used CDCLVC1104 in my design. There is a table on page 10 of the data-sheet showing the output logic states with respect to "CLKIN" and "1G"(Enable). I have encountered ...
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Where to find the date code or lot trace code on a Texas Instruments LMZ14202?

I have a Texas Instruments LMZ14202. I'm trying to find the date code or lot trace code for this chip. The top of the chip shows the part number (obviously) and an 8-digit alphanumeric string of ...
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CCS/RF430FRL152HEVM: Trouble NFC value reading for RF430FRL152H

I am using the RF430FRL152HEVM kit for NFC communication with a mobile phone. I am building an app to read from this evaluation board and I am having trouble sending/reading an NDEF signal. I saw that ...
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PoE system with Active Clamp Forward

Does anyone know if choose the Active clamp forward as the topology in PoE system, according to this figure which from TI Design document, What's the function of C39. I do not understand why need to ...
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Reverse Battery Protection using P-Channel MOSFET

I read the TI document on page 5, according to this figure, when the GS of MOSFET from negative to positive the P MOSFET turned off, but why the Vout voltage will drop to minus.
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1 answer
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What is ORing and why is it named ORing?

I read some documents like the PoE application, it used ORing to protect the reverse input current. I would like to know what ORing is. I googled it, but I cannot find the answer. It seems like a ...
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TMS320F28375Dpzps JTAG Communication Problem?

At the moment I am trying to run the TMS320F28375Dpzps . I use Jtag as TMS320-XDS100v3_UM-336636 and the program Code Composer to communicate with the Micrcontroller. The JTAG (picture: JTAG) and the ...
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Gate Driver Circuit Question

I read the PoE PD Schematic Review Guidelines, and there is a gate driver circuit I don't understand how that works. Can someone tell me how to work? 1.) On the page 22, the dotted boxes are the gate ...
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DC/DC output ripple voltage

Our team is using TI's TPS62740 IC as a DC-DC converter in our device. At Vout (without connecting load) I get a sawtooth waveform of about 9 mV peak to peak. After adding a 2nd order low pass filter ...
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Type 3 PoE PD with High Efficiency DC-DC Controller

I am reading the TI POE IC(TPS23730's datasheet), and I have some questions I would like to ask you, if you can help me I will very much appreciate it. 1.) What's the internal hot-swap MOSFET, I have ...
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