Manufacturer

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Application Notes

Multi-Frequency Range and Tunable DCO on MSP432P4xx Microcontrollers (Rev. A)

Texas Instruments
Multi-Frequency Range and Tunable DCO on MSP432P4xx Microcontrollers /Microcontrollers/MSP/App_Reports/SLAA658/

Barometric pressure sensor and use cases

Infineon Technologies AG

This document provides an overview of barometric pressure sensing, digital air pressure sensor and use cases.

The document is intended for Infineon customers who wish to develop applications based on DPS310 barometric pressure sensor.

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.

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.

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.

Piezo Haptics With Integrated Waveforms: DRV2605L-Q1 and DRV2700

Texas Instruments

The DRV2700 is a high-voltage piezo driver with an analog input. This device is one of the many haptic feedback drivers that Texas Instruments offers. One design challenge many customers face using the DRV2700 is the analog input. Generating an analog input signal can burden the processor and be undesirable. This application note addresses this challenge and provides a solution.

Capacitive Touch Through Metal Using MSP430™ MCUs With CapTIvate™ Technology (Rev. A)

Texas Instruments

MSP430 microcontrollers (MCUs) with CapTIvate technology from Texas Instruments provide a high-sensitivity capacitive touch solution with high reliability and noise immunity at the lowest power. This application report demonstrates a new capacitive touch application through metal overlays using CapTIvate technology. Microscopic movements in a flat metal can be sensed and processed to determine how hard a given button was pressed due to the high sensitivity and resolution of TI's technique. This approach allows reuse of existing metal surfaces commonly found in many applications such as building security systems, appliances, and consumer electronics. The document describes the fundamentals of TI's CapTIvate technology-based metal touch technique and provides guidance on how to design a touch on metal panel with MSP430 MCUs featuring CapTIvate technology. Applications and noise immunity considerations are also discussed in this document. This application report assumes that readers are reasonably familiar with elementary capacitive touch principles, CapTIvate technology, and MSP430 microcontroller architecture.

Incremental Rotary Encoder Design Considerations

Texas Instruments

Incremental rotary encoders transduce rotational movement into electrical signals. Unlike absolute encoders that measure angle, incremental encoders generate high/low pulses as turning occurs.

Applications include computer mouse wheels, fluid flow meters, knobs, wheel speed sensors, stepper motor feedback for detecting missed steps, and brushed DC motor sensors for automotive windows, sunroofs, seats, and mirrors.

Introduction to Ultrasound

Texas Instruments

Medical and industrial ultrasound systems use focal imaging techniques to achieve imaging performance far beyond a single-channel approach. Ultrasound images are created by sending high voltage pulses into human tissue. The sound generated by these pulses echoes off of the tissues at varying amplitudes depending on factors such as depth within the body and type of tissue. Ultrasound technology is manufactured to measure the voltage magnitude of these echoes as they are collected at the receiver. These voltages are ultimately recorded and displayed in an image that tells what kinds of surfaces the pulses are passing through.

Clocking for Medical Ultrasound Systems

Texas Instruments

This application note discusses the importance of clocking in Ultrasound and also illustrates how some key TI devices achieve very low end to end jitter and phase noise. The application note also demonstrates how various stages have very low additive jitter.

A Contactless Rotary Encoder

Dialog Semiconductor

This application note describes how to design a high reliability rotary switch or encoder using a Dialog GreenPAK. This switch design is contactless, and therefore ignores contact oxidation and wear. It is ideal for use outdoors where there is long term moisture, dust, temperature extremes, etc.

Dialog GreenPAK SLG46537: The GreenPAK CMIC provides all the circuit functions for this design. It generates a signal (EVAL) for improved signal to noise, receives inputs from each sector pad of the rotary switch, and interprets each sector pad using the Asynchronous State Machine(ASM) to guarantee only one switch selection.

Low Power DC/DC Converter

Dialog Semiconductor

Galvanically isolated interfaces are a common requirement within industrial devices for safety reasons. In this type of application, a digital isolator is used to galvanically isolate an MCU from a communication transceiver or an ADC.

Digital isolators work at two power domains, using an isolated DC power supply in one domain. The low DC voltage for isolated power domain could be achieved with a small and simple push-pull converter. The push-pull converter is a transformer-isolated topology using two transistors switching in complementary mode.

This application note will present a low cost and low power DC/DC push-pull converter based on the Silego GreenPAK SLG46108 device. The following sections will show how to:

  • Generate a complementary PWM with dead time using the programmable delay block.
  • Generate a start-up sequence using a pipe-delay block.
  • Obtain multiple clock frequencies via an internal oscillator.

TVS Surge Protection in High-Temperature Environments

Texas Instruments

To ensure reliability during events like power switching, hot plugs, lightning, and various other fault situations, systems must account for surge protection; however, most common surge-protection TVS diodes have significant variation over temperatures that is rarely accounted for. This variation can lead to failures in released products that were not seen in lab testing; to minimize these failures, TVS diode performance must be understood and accounted for. This report examines the temperature variation in conventional SMA and SMB type TVS diodes and compares them to the TI Flat-Clamp surge protection, and then shows laboratory testing in a real-world system that highlights the improved high-temperature performance of the TI Flat-Clamp devices.

Controlling 96 LEDs With LED171596A

Texas Instruments

The LED171596A is an LED matrix driver that can individually control up to 96 LEDs. To control the 96 LEDs it uses four high-side PMOS switches and 24 low-side programmable current sinks. The driver has 9-bit duty cycle and 8-bit current control of each low side LED current sink. They can be individually controlled through the I2C-compatible or SPI interface. The individual LED brightness is internally multiplied with a global brightness-register value. This allows the control of all the LEDs at once with a single register or PWM input signal. This global brightness also passes through a brightness sloper function to create optically smooth brightness transitions without the need for multiple register writes.

HSR/PRP Solutions on Sitara Processors for Grid Substation Communication

Texas Instruments

HSR/PRP is Ethernet based communication technology commonly deployed in smart grid substation for low cost, easy to maintain and interoperable common network infrastructure with built-in redundancy. This application report presents the overview of HSR/PRP technology followed by HSR/PRP solutions on Sitara devices. TI’s PRU-ICSS technology with features like real-time and determinism allows Sitara devices to offer HSR/PRP solution. HSR/PRP solution is available as part of Processor SDK for Linux and RTOS.

This document points to various collateral and resources available for customers to quick ramp on HSR/PRP solution on Sitara devices including PRU-ICSS technology.

TI mmWave Radar sensor RF PCB Design, Manufacturing and Validation Guide

Texas Instruments

This application report helps TI mmWave Radar sensor designers navigate the series of tasks and key concerns when designing, manufacturing and validating a new mmWave sensor board. This document is only concerned with the RF portions of the design. It is beneficial for PCB designers that do not have experience with RF PCB design at mmWave frequencies. This document is applicable to sensor designs using IWR/ AWR mmWave Radar chips.

Simplify Home Audio Systems With the PCM9211 - A Versatile Audio Transceiver

Texas Instruments

Large-screen HDTVs are selling in huge volumes over last few years, primarily driven by amazing improvements in picture quality & form factor (thinner screens). The form factor constraints from having skinny screens result in tiny built-in speakers that are undersized, under-powered and are typically aimed at wrong direction. Hence sound bars have exploded in popularity as complementary audio system by providing a sound experience that more closely matches the TV’s life-like pictures. In addition, with release of HDMI 2.1 specification we finally have a no compromise audio solution for HDMI as part of the eARC [enhanced Audio Return Channel]. One of the most important functions the eARC enables is sending audio signal both “upstream” and “downstream” over a single connection. As a result, with eARC the full resolution sound signals can be passed back and forth between your TV and audio systems with ease and without compromising sound quality.

Automotive Current Monitoring Using High Speed Amplifiers

Texas Instruments

With vehicle electrification increasing and as fully electric vehicles become more mainstream, the number of electric motors and digital power control systems in automobiles are expanding. Many of these systems require high-speed current monitoring circuits to ensure proper operation and to protect against potentially damaging overcurrent conditions. One of the most effective ways to accomplish this function is to employ a low side current shunt monitoring circuit.

Tools and Techniques to Root Case Failures in Video Capture Subsystem

Texas Instruments

This application report documents different tools and methods that are useful while debugging issues with the video capture subsystem on the Jacinto6™ (DRA7xx) family of system-on-chip (SoC). This can be used as a diagnostic test to root cause most common failures in the video capture use cases.

Audio Post Processing Engine on Jacinto™ DRA7x Family of Devices

Texas Instruments

The automotive experience demands the tools for manufacturers to create high-quality audio for the vehicle occupants, while also enabling those same occupants to customize audio settings for their desired tastes.

A myriad of audio input sources, including CD/DVD, radio, aux input, streaming music, Bluetooth® audio, navigation, alerts, and other notifications, routed to multiple output playback zones necessitates an audio subsystem tailored for the automotive audio market. TI’s Audio Post Processing Engine (APPE) on Jacinto devices provides a common audio framework for automotive OEMs to enable this user customization, while also allowing Tier 1 providers and OEMs to fine tune their audio for the best possible out-of-the-box user experience. By implementing audio processing algorithms and routing within TI’s C66x Digital Signal Processor (DSP) on Jacinto 6 DRA7x single chip solutions, automakers can reduce hardware system cost and integration complexity. This same audio solution can also be leveraged across multiple operating systems, such as QNX®, Linux®, and Android™. APPE provides real-time controls from the High-Level Operating System (HLOS), allowing customers with limited DSP experience to leverage a large suite of audio algorithms, including dynamic range compression, equalizers, mixers, and volume controls. Automotive manufacturers can also easily add additional algorithms to further differentiate their end platform.

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