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Application Notes from Texas Instruments

PGA460-Q1 in Automotive Ultrasonic Kick-to-open Liftgate Systems (Rev. A)

Texas Instruments

Also known as a Smart Trunk Opener (STO), the kick-to-open trunk application has grown significantly over recent years, especially in SUVs and high-end passenger vehicles. This feature allows the vehicle owner hands-free access to open the trunk with a simple kicking motion near the rear bumper.

HiFi Audio Circuit Design

Texas Instruments

With the increase in personal electronic devices, HiFi audio is more popular than ever in many applications, such as smartphones, music players, home theaters, and even car infotainment. Many engineers and consumers devote themselves to the endless journey in HiFi audio. This document will help engineers understand, judge, design, and optimize a HiFi audio circuit.

Enabling HDMI over Type-C using TUSB564A-DCI

Texas Instruments

The TUSB546A-DCI is a linear redriver that supports both USB3.1 Gen1 and DisplayPort 1.4 over a USB Type-C interface. Even though the TUSB546A-DCI was released for the DisplayPort Alternate mode, the TUSB546A-DCI can also be used as a redriver in a USB-C HDMI Alternate mode source application. This document is intended to describe how to use the TUSB546A-DCI in a HDMI Type-C source application. The information in this document can also be applied to the TUSB546-DCI, TUSB1046-DCI, and TUSB1046A-DCI. For the remainder of the document TUSBx46 is used to describe all of these parts

Designing High Performance, Low-EMI, Automotive Power Supplies

Texas Instruments

From the adoption of driver-assistance cameras to the advancement of fuel efficiency, the intelligence of cars is constantly improving. With these new performance enhancements and their growing power demand, the automotive power management system is responsible for powering and protecting the downstream electronic components during nominal and transient conditions. This application report discusses the unique challenges to designing automotive power supplies.

Migrating to the SimpleLink MSP432 Family (Rev. D)

Texas Instruments

The 16-bit MSP430 and the 32-bit SimpleLink MSP432 microcontroller (MCU) families complement each other in low-power and performance. The goal of this migration guide is to help developers accurately assess the effort to migrate an existing application from the 16-bit MSP430 to the 32-bit SimpleLink MSP432 Arm platform if they so choose to. Ultimately, the migration guide is built to help derive a migration strategy with complete hardware and software coverage that properly migrates the existing application without introducing bugs due to platform differences while still taking advantage of the unique features or performance improvements that the 32-bit MSP432 devices bring.

LDO PSRR Measurement Simplified (Rev. A)

Texas Instruments

This application report explains different methods of measuring the Power Supply Rejection Ratio (PSRR) of a Low-Dropout (LDO) regulator and includes the pros and cons of these measuring methods.

Achieving Optimum Radio Range (Rev. A)

Texas Instruments

This application report addresses the parameters that affect the radio range. For identical radio settings, the range is highly dependent on the surroundings and environment. The link budget and the positioning of the antennas and their distance to the ground surface are major contributors to long range. A general specific range can never be specified or guaranteed for any type of radio communication unless the environment is well defined. Predicting a range is difficult and the excel sheet calculation helps to calculate a realistic range that can be achieved for a known environment.

EMI-Hardened Operational Amplifiers Reduce Inaccuracies

Texas Instruments

Operational amplifiers (op amps) with electromagnetic interference (EMI) filters can reduce significant errors. These types of errors are not always obvious to the system designers. They often impact the signal chain, in particular the analog-to-digital converter in the form of a loss of digital counts.

Single-Wire Communication Host With MSP430 MCUs

Texas Instruments

Several features commonly used in microcontroller (MCU) designs, such as external EEPROMs, SHA-1 authenticators, temperature sensors, digital switches, and battery system monitors, use a single bidirectional line to transfer data between itself and a master device. Commonly referred to as 1-wire or SDQ single-wire serial interfaces, this communication peripheral reduces the number of physical hardware connections required while adhering to a protocol that can be easily achieved with MSP430 MCUs acting as the function's master. Commands can be basic enough to operate with the MSP430FR2000 MCU, which contains 512 bytes of main memory, or expanded to service a multitude of operations and slave devices. A code example that demonstrates the initialization of such an interface is below. To get started, download project files and a code example demonstrating this functionality.

Power Gating Systems with Magnetic Sensors

Texas Instruments

Well-designed electronic systems only use as much power as they need to for each state of operation. While this is crucial for battery-powered systems, AC powered systems also benefit from minimizing power, since that reduces heat dissipation, maximizes the product lifetime, and conserves electricity.

Low-power modes work best when they seamlessly transition to a higher power mode without the user taking separate action. This full automation will be paramount to smart systems of the future. When the power mode can change based on some mechanical movement occurring, Hall effect sensors are often a suitable technology to be used.

MSP430FR6047 and Ultrasonic Software Based Water Flow Meter Measurement Results

Texas Instruments

This document summarizes the results of the measurements with the RevA MSP430FR6047 device with the ultrasonic software library for water flow meter.

Mounting Hardware and Quick Reference Guide for DLP Advanced Light Control DMDs

Texas Instruments

This Application Note is a reference guide for the Mounting Hardware of DLP Advanced Light Control (ALC) digital micromirror devices (DMD).

This guide briefly describes the DMD mounting hardware, including figures and tables for each DLP DMD. The figures show mounting concepts with their associated DMD mounting hardware parts. The tables list the individual mounting hardware parts, weblinks to the supplier’s ordering page (if applicable), and weblink to the dedicated “System Mounting Concepts” Application Report. This Quick Reference Guide comprehensively addresses the DMD Specifications and System Mounting Concepts and includes important application design considerations.

High-Speed Interface Layout Guidelines (Rev. G)

Texas Instruments

As modern bus interface frequencies scale higher, care must be taken in the printed circuit board (PCB) layout phase of a design to ensure a robust solution.

Temperature Sensors: PCB Guidelines for Surface Mount Devices

Texas Instruments

Power hungry electronic components such as CPUs, GPUs, or FPGAs, as well as voltage regulators heat up during operation. Some applications require ambient air temperature measurements while others need to measure the temperature of a nearby component on the PCB. Measuring ambient air temperature with a surface mount technology (SMT) device is challenging due to the thermal influence of other components within the system. In other systems, in which the temperature of a component needs to be measured, ambient air temperature can influence and degrade the measurement accuracy. The system designer needs to make certain design decisions regarding both package type and PCB layout when integrating a temperature sensor.

This application note provides recommendations to system designers and explains methods for improving the accuracy of the temperature point being measured. The Recommendations are provided both for air temperature measurements and for component temperature measurement. The report details layout techniques, device orientation, and best practices for mounting.

Full-Scale Current Adjustment Using a Digital-to-Analog Converter (DAC)

Texas Instruments

The ability to dynamically control current in an inductive load system is very important for stepper motor designs where different levels of torque control are desired. This adjustment feature can also be used to improve system efficiency by reducing the motor current in low-load situations, achieving a longer battery life.

This application report is provided as a supplement to the data sheet for the DRV8884, DRV8885, DRV8886 and DRV8886AT motor drivers. The goal of this document is to show how to achieve accurate current regulation in normal and low-power modes using different methods. This document also describes different sources of error in these configurations, how to minimize these errors, and the key factors to consider when doing a design.

Rotation Detection With the MSP430 Scan Interface (Rev. B)

Texas Instruments

This application report details the measurement principles for using an LC sensor to detect rotational movement. Based on this measurement principle, an example project is presented demonstrating contactless rotational measurement using the Scan Interface (Scan IF) of the MSP430FW42x family of devices. Software as well as hardware for the implementation is explained.

Isolated RS485 to RS485

Texas Instruments

This application note presents the idea of achieving all-port isolation in an existing non-isolated RS-485-to-RS-485 communication link without delving into the details of the protocol between the nodes.

Comparing Bus Solutions (Rev. C)

Texas Instruments

The strong interest in this application report prompted this third edition. In addition to the changes and updates made throughout these sections, this edition also discusses Local Interconnect Network (LIN), USB-On-the-Go, DisplayPort, digital isolators, and more. This application report serves as a reference tool for finding the most appropriate data bus solution for today ’s advanced system architectures. It gives an overview of the different bus solutions available from Texas Instruments. Designers can use many different solutions to solve the same problem. The task is to identify the optimum solution for their application.

This application report makes it easier for designers to do this. It has sections on data transmission fundamentals, data line drivers and receivers, data links, and data signaling conditioners. Subsections discuss the electrical properties, applicability, and features of each product family.

Digital Filter Types in Delta-Sigma ADCs

Texas Instruments

This application report discusses digital filters which are a ubiquitous feature in delta-sigma analog to digital converters (ADCs). Digital low-pass filters are essential to the functionality of a delta-sigma ADC, which relies on oversampling and noise shaping to push quantization noise out of band. There are variations between the types of digital filters used in delta-sigma ADCs that provide various benefits and drawbacks that orient them to different applications. The types of filters and the tradeoffs between them are discussed in this report.

High Speed Layout Guidelines (Rev. A)

Texas Instruments

This application report addresses high-speed signals, such as clock signals and their routing, and gives designers a review of the important coherences. With some simple rules, electromagnetic interference problems can be minimized without using complicated formulas and expensive simulation tools. Section 1 gives a short introduction to theory, while Section 2 focuses on practical PCB design rules. Either section can be read independently.

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