Questions tagged [texas-instruments]

A manufacturer of semiconductors, both discrete and integrated circuits.

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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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44 views

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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52 views

Loose connection leads to an uncontrolled load transient for LM2596 output

Recently I started going up with the LM2596 input voltage. Initially, I was using 12V INPUT, but the requirement raised to a minimum of 24V and max 36V. I noticed a spark while plugging in the input ...
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32 views

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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2answers
82 views

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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51 views

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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18 views

TMS320F28377S Unable to enter the SCI transmission interrupt

SCI peripheral initialization configuration is as follows: ...
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26 views

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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41 views

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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44 views

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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44 views

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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41 views

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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138 views

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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64 views

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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1answer
282 views

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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140 views

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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64 views

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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581 views

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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53 views

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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68 views

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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102 views

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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1answer
76 views

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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1answer
30 views

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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22 views

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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27 views

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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77 views

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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73 views

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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1answer
35 views

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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73 views

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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3k views

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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42 views

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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80 views

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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112 views

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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101 views

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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1answer
112 views

How are embedded C compilers different from C compilers used for desktop applications?

I've started learning about embedded systems and wondering since the compilers used for embedded applications aren't the same as the ones used for desktop applications; whether they behave differently ...
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88 views

TI Webench and PSpice Conflicting Results for LM3150 Buck Converter

I am currently in the process of designing a 24V to 5V buck converter using the TI LM3150 buck converter (datasheet). I designed the buck converter to meet the following operating parameters: Vin = 6-...
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72 views

How to send a NDEF Message using RF430FRL152H board and MSP430

I want to send an NDEF message, and it seems like there is an example code from texas instruments on the RF430FRL152H board. However, I don't understand it. I see that it creates an NDEF message but I ...
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26 views

RF430FRL152H NFC is not sending an intent to be read from android app

I am trying to code an app on Android Studio that reads data from the RF430FRL152H board, but first, it needs to see if there exists an NFC TAG. I have code set up from many different sources and so ...
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3answers
87 views

Using a "non-audio" oriented DAC IC as an audio DAC

I'm starting a project that consists of a simple embedded 16-bit PCM audio player, where no actual DSP takes place, only plays PCM and outputs something you can then amplify. I am currently searching ...
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81 views

TPS61023 not regulating output when VIN > VO

I'm using TPS61023 + BQ24075 in a power management circuit so that when a USB cable is plugged in the system will charge a LiPo battery while still powering the system with 3.3V. When the USB cable is ...
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22 views

high voltage isolated dc/dc converter watt selection problem

I am a beginner circuit developer. I used a TI WEBENCH POWER DESIGNER, to make all-in-one battery management system power design. POWER DESIGNER made a recommendation like the picture. Specifically, ...
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1answer
21 views

MSP430 Energia Basics ReadAnalogVoltage output 11 Volt

I'm a beginner starting with the MSP430F5529 Launchpad. I'm just running the Basics code 'ReadAnalogVoltage' that comes in Energia to test the voltage value. I literally have all the wires and ...
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102 views

Buck converter (TPS54331) oscillating

I have designed and built a buck converter based on the TPS54331 which oscillates at 5.4kHz with an amplitude of 700mV peak-to-peak under a 1A load. I want to remove these oscillations. Here is a ...
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200 views

What is "voltage output swing from rail" in a TI op. amp. datasheet?

I'm reading this datasheet about the LM358P op. amp. I'm trying to understand what is the output foltage swing from rail. I suspect it is the amount of volts that ...
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46 views

Replacing mic22705 buck converter with cheaper one

Since Microchip decided to increase their mic22705 price, my company decided to replace it with another synchronous buck converter. the current price we get for 20K units of mic22705 is 1.459$. The ...
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29 views

Simulating TPS54719 DC2DC in TI WEBENCH Power Designer

I'm interested in using TI TPS54719 to create 3 output voltages: 1.2V, 1.49V, 3.3V using three TPS54719 devices. the same Vin voltage will be connected to the three devices and the Vin range is: Min = ...
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50 views

TPS541620 Buck converter IC - Feedback loop

I've been designing a POL supply using TI's new TPS541620. This seemed to be a good choice but it being new, it's quite hard to get more support than the datasheet can provide. And unfortunately some ...
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63 views

BQ24450 Texas Instruments

I need your help to find out why my lead acid battery is not fully charged when I am using the BQ24450 by Texas Instruments. These are my calculated values based on the fomula: Rt=150 ohm Ra=214.79k ...
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18 views

ADG1408+TLC5940 LED matrix leakage

I am controlling a multiplexed LED matrix with a combination of an ADG1408 as power switch and a TLC5940 as current sink. The system works almost perfectly except for some LEDs that do not stay OFF ...
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67 views

DRV8860 - Open drain output with 1.4k internal pull-up - How to understand this low value

I'm going through the Datasheet of DRV8860 and got confused by the pull-up setting of DOUT. In the Datasheet the block Diagram shows the pull-up as follows: In the "Electrical characteristics&...

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