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1.2V to 50V @ 3A – Adjustable Power Supply with 55Vdc Input

Posted on by mixos

The project presented here is a wide input voltage range non-isolated DC-DC Converter, that provides a regulated, adjustable output voltage. The operating input supply is 55V DC and output regulated from 1.2V to 50V DC. The project built using LM2576HVT-ADJ IC. Screw terminals provided for easy input and output connections, onboard power LED at the input, bridge rectifier for AC/DC Input, an onboard potentiometer to adjust the output voltage, etc. This is a low-profile board with a thermal area on PCB that acts as a heatsink. An additional LC filter using C5 and L2 that reduces the output ripple by a factor of 10 or more is included in this circuit. The device has a current limiting feature to prevent the switching current from exceeding a safe value during an accidental overload on output.

1.2V to 50V @ 3A – Adjustable Power Supply with 55Vdc Input – [Link]

Galvanic Isolated 8 Channel High-Side Switch (0.6A per channel)

This project provides 8 fully protected and isolated high-side power switches that are able to handle current up to 625 mA. An 8-bit parallel microcontroller compatible interface allows connecting the inputs directly to a microcontroller or standalone circuit system. The input interface also supports direct control mode and is designed to operate with 3.3/5V CMOS compatible levels. The signal transfer from input to output side is realized by the integrated Coreless Transformer Technology. The board is designed for industrial applications such as process control and PLC to drive inductive, resistive, and capacitive loads like Relay, solenoid, lamps, heaters, piezo.

The input can be driven by applying 3.3V/5V CMOS compatible signals to connector CN1. It can operate in microcontroller Mode by using Chip Select and Write Signals or in Direct Control Mode by closing the Jumper J1 and J2 and setting the Data Input from D0 to D7. The Output consists of 8 Channel High Side Switches with 0.6A Current rating. The Output is protected with a channel selected over-temperature switch (to off). The 8 high-side power switches are controlled by means of the integrated parallel interface. The interface is 8-bit μC compatible. Furthermore, a direct control mode can be selected that allows the direct control of the outputs OP0…OP7 by means of the inputs D0…D7 without any additional logic signal. The μC compatible interface allows a direct connection to the ports of a microcontroller without the need for other components. Each of the 8 high-side power switches is protected against short to +DC (VBB), overload, over-temperature, and against over-voltage by an active Zener clamp.

uC interface to the board

Features

  • +DC(VBB) Load Power Supply 11V to 45V (CN2)
  • Logic Supply input Side 3.3V to 5V (CN1)
  • LED D1 Power LED Logic Supply (Input Side)
  • LED D2 LED On When (overtemperature or Vbb (+DC) below ON-Limit is detected)
  • Load CN3 to CN7
  • Interface 3.3/5V CMOS operation compatible
  • Parallel interface
  • Direct control mode
  • High common-mode transient immunity
  • Short circuit protection
  • Maximum current internally limited
  • Overload protection
  • Overvoltage protection (including load dump)
  • Undervoltage shutdown with auto-restart and hysteresis
  • Switching inductive loads
  • Common output disable pin
  • Thermal shutdown with restart
  • Thermal independence of separate channels
  • Common diagnostic output
  • ESD protection
  • Loss of -GNDBB (GNDbb) and loss of +DC(Vbb) protection
  • Reverse Output Voltage protection
  • Isolated return path for DIAG signal
  • +DC (Vbb) monitoring
  • PCB dimensions: 87.49 x 62.07 mm

Testing the Project 

Direct mode:  CLOSE the Jumper J1, and J2, open the Jumper J3, Connect the Load between OP to GDB, apply load power supply to CN2, apply logic supply to CN1, Output will be default high due to pullup Resister network on input, pull down the input pin D0 by connecting to GND or using micro-controller, the output will be OFF.  LED D1 Power LED for logic supply, LED D2 turn ON When overtemperature or Vbb (+DC) below ON-Limit is detected.

Jumper J3 (DIS) DIS (Output disable) Jumper J3 Close = Disable Output, Open Enables the Output

The high-side outputs OUT0…OUT7 can be immediately switched off by means of the low active pin DIS that is an asynchronous signal. The input registers are also reset by the DIS signal. The Output remains switched off after a low-high transition of the DIS signal, till new information is written into the input register. Current Sink to GNDCC.

Micro-Controller Mode: μC Control Mode /CS – Chip select. The system microcontroller selects the ISO1H811G by means of the CS pin. Whenever the pin is in a logic low state, data can be transferred from the μC. /WR – Write. The system controller enables the writing procedure in the ISO1H811G by means of the signal WR. A logic low state signal at pin WR writes the input data into the input latches when the CS pin is in a logic low state. D0…D7. The parallel input data is transferred to the input latches with a high-to-low transition of the signal /WR (write) while the /CS is logic low. Then a low-to-high transition of /CS transfers the data of the input latches to the output buffer. The μC Control Mode can be operated by connecting a Processor Board to the corresponding Signals of Connector CN1. Refer to datasheet of the chip to operate in micr0-controller mode.

Schematic

Parts List

NO.QNTY.REF.DESCMANUFACTURERSUPPLIERSUPPLIER PART NO
11CN116 PIN MALE HEADER 2.54MM PITCHADAM TECHDIGIKEY2057-PH1-16-UA-ND
26CN2-CN72 PIN SCREW TERMINAL 5.08MM PITCHPHOENIXDIGIKEY277-1247-ND
31C1470uF/50V ELECTROLYTICPANASONICDIGIKEYP10400TB-ND
42C2,C40.1uF/50V SMD SIZE 0805MURATA/YAGEO
51C31uF/50V SMD SIZE 1206 OR 1210MURATA/YAGEO
61C510uF/10V TANTALUM SIZE 1210 OR 1206AVX CORPORATIONDIGIKEY478-3451-1-ND
71C610uF/50V SMD SIZE 1210MURATA/YAGEO
82D1,D2LED SMD SIZE 0805OSRAMDIGIKEY475-1278-1-ND
93J1,J2,J3JUMPER/SHUNTSULLINSDIGIKEYS9001-ND
104R1,R2,R3,R54.7K 5% SMD 0805MURATA/YAGEO
111R41K 5% SMD 0805MURATA/YAGEO
121U1ISO1H811GINFINIONDIGIKEYISO1H811GAUMA1CT-ND
131RN14.7K RAPCK 9 PINBOURNS INCDIGIKEY4309R-101-472LF-ND

Connections

Truth Table

Gerber View

Photos

Video

ISO1H811G Datasheet

Knowles IA611 SmartMic Voice Wake Audio Processor

Posted on by mixos

Knowles IA611 SmartMic Voice Wake Audio Processor features an “always-on” Processor providing a Voice Wake and Voice ID keyword detector, a two-second buffer, and Knowles’ proven high performance acoustic SiSonic™ MEMS microphone technology in a single, miniature, top-port package.

The Knowles IA611 SmartMic Voice Wake Audio Processor offers flexibility by supporting the most relevant audio and data interfaces. The IA611 provides integrated programmable DSP with 248kBytes of RAM available for customers and 3rd party algorithms, enabling unlimited creativity. The solution pushes the system performance to ultra-low-power with its custom core design and accelerates time to market with its highly integrated combination of hardware, software, and firmware.

Features

  • High-accuracy Voice Wake and Voice ID keyword recognition to wake-up any system from a trigger phrase
  • Minimum latency when burst out two-second audio buffer using SPI
  • Ultra-low-power “always on” acoustic activity
  • Detector (AAD) capable waking the embedded DSP
  • Interrupt signal to the host processor when a voice keyword trigger is detected
  • Integrated power tree from a single 1.8V supply
  • Extra flexibility with I2C/UART interfaces
  • 248kB RAM, 160MFLOPS, 43MHz, 32-bit complex valued floating-point ALU, low-power open developer platform with SDK
  • High-performance acoustic SiSonic MEMS with ±1dB matched sensitivity, 65.5dB SNR and 132.5dB SPL AOP
  • Packaged in SPK 4.00 x 3.00 x 1.30mm

more information: https://solutions.knowles.com/hardware/application/3/IA610-Ear,IA611-Ear

New Humidity Sensors Based on MEMS Technology Offer Fast Response Time and High Accuracy/Sensitivity in a Small Footprint

Posted on by mixos

Bourns has upgraded its line of humidity sensors with the new Model BPS240 series that meets advanced sensor needs with fast response time, high accuracy/sensitivity in a small footprint. Based on Microelectromechanical Systems (MEMS) technology, the new devices in the series offers upgraded features compared to BPS230 humidity sensors released previously by the company.

The Model BPS240 series humidity sensor is designed to meet advanced sensor needs for immediate updates on relative humidity levels in a broad range of industrial automation, energy, building, and home control, and low/medium-risk medical applications. The devices also help meet energy-efficient application requirements with their low voltage operation, reduced current consumption, and reliable embedded capacitive technology.

Faster response time of less than one second with digital (I2C) output and higher accuracy with a typical RH accuracy of 2% are the key features of the new devices released. Besides, the sensors deliver reliability in a small size (2.0 x 2.0 x 1.25 mm) footprint. The new Bourns Model BPS240 humidity sensor series is RoHS compliant and is available from the company website.

Features of BPS240 Series Humidity Sensors

  • Low voltage operation
  • Low current consumption
  • Fast response time
  • I2C communication protocol
  • Reliable capacitive technology
  • Relative humidity accuracy of ±2 %

more information: https://www.bourns.com/home

Ultra-portable Handheld Microwave Spectrum Analyzers Supporting 6 GHz – 20 GHz

Posted on by mixos

SAF Tehnika has expanded its Spectrum Compact family of ultra-portable handheld microwave spectrum analyzers with the introduction of a model that supports 6 GHz – 20 GHz. Providing best-in-class price/performance, the new Spectrum Compact delivers high durability at an affordable price point, making it a perfect tool for field engineers and technicians responsible for link planning, installation, site acceptance, maintenance, and troubleshooting of wireless networks. 

The 6-20 GHz spectrum analyzer has high sensitivity of -110 dBm at 30 kHz resolution bandwidth, long battery life of up to 4 hours, and instant-on functionality for quick start-up and operation. All this high-performance is designed in a rugged, ultra-compact form factor that measures only 135 x 83 x 34 (mm)/ 5.31 x 3.27 x 1.34 (inches) and weighs 0.57 kg/20.11 oz. It is ideal for mobile carriers, telecommunications professionals, Internet service providers (ISPs), and contractors responsible for regulatory and compliance, drone applications, and satellite operations.

Every aspect of the Spectrum Compact family has been designed to address the challenges of field applications. Similar to all Spectrum Compact models, the 6 GHz – 20 GHz handheld spectrum analyzer has a resistive touchscreen for operation with gloves, and high contrast and full display modes for easy readability in bright light environments. Durable thumbscrews for the waveguide adapter connections help the Spectrum Compact to withstand harsh environments. Spectrum traces can be saved in the integrated 8 GB of memory, for offline analysis, investigation, and reporting using the Spectrum Manager PC software.

The 6 GHz – 20 GHz instrument extends the frequency range for the Spectrum Compact family. Included in the series are the world’s only portable E-band (70-87 GHz) and V-band (56-71 GHz) handheld spectrum analyzers.

Spectrum Compact devices are well suited for mobile operators, carriers, and tower installation crews deploying 5G networks, Wireless Internet Service Providers (WISPs), local government institutions, public safety departments, and critical network infrastructure owners. Field engineers and technicians can use the ultra-portable handheld microwave spectrum analyzers to conduct site surveys, radio parameter verification, antenna alignment, interference detection, line-of-sight verification, signal strength mapping, and interference hunting.

more information: https://spectrumcompact.com

LTC2971 2-Channel ±60 V Power System Manager

Posted on by mixos

Analog Devices’ DC2875A is a demonstration system for the LTC2971 power system manager that interfaces to various regulators.

ADI’s LTC2971, LTC2971-1, LTC2971-2, and LTC2971-3 are 2-channel high voltage power system managers used to sequence, trim (servo), margin, supervise, manage faults, provide telemetry, and log faults.

The DC2875A is a demonstration system for the LTC2971 power system manager that interfaces with various regulators. The board contains all the circuitry needed to demonstrate a power system that utilizes two 2-channel LTC2971 devices that manage four power supplies. The four power supplies include various switching regulators for demonstrating a variety of methods to sense voltage and current. The demo board provides a sophisticated 4-channel digitally programmable power supply system.

Features

  • Natively sense and monitor negative voltage supplies, eliminating external level shift circuitry which saves cost, simplifies design, and improves accuracy
  • Internal EEPROM with ECC provides essential black box fault logging, allowing for faster failure analysis and system debug
  • ±0.25 % TUE differential ADC (sets trim, margin, and monitoring accuracy) improves the accuracy of 2 supplies, minimizing overdesign and cost, optimizing performance, and saving power

more information: https://www.analog.com/en/products/ltc2971.html

Tiny Tri-color E-Ink display for Wemos D1 Mini board sells for $10

Posted on by mixos

Lolin has launched a small 2.13″ tri-color E-Ink display that is compatible with D1 mini, D1 mini Pro, and D32 Pro boards.

Specifications

The display can be programmed with Arduino using LOLIN_EPD, Adafruit_GFX, and Adafruit_BusIO libraries as explained in the Wiki. You’ll find three Arduino sketch samples on Github.

The display is available on aliexpress for 9.90USD with shipping included.

via www.cnx-software.com

Raspberry Pi Foundation Re-introduces Four IQAudio HATs at Lower Prices

Posted on by Emmanuel Odunlade

Sometime in December last year, Raspberry Pi Foundation, after acquiring IQAudio Brand, mentioned that it had plans to relaunch IQAudio’s four most popular HATs as their official Pi accessories. The foundation has now reintroduced the popular audio add-ons with improved features and lower prices ranging from $20 to $30.

“This is the first time we’ve brought third-party products into our line-up like this,” says Roger Thornton, Principal Hardware Engineer at Raspberry Pi. “IQaudio was one of the first companies to recognise the potential of Raspberry Pi as a platform for hi-fi audio. IQaudio products are widely used by hobbyists and businesses (in-store audio streaming being a particularly popular use case). So when the opportunity arose to acquire IQaudio’s brand and product line late last year, we jumped at it.”

The IQaudio HATs are: the IQaudio DAC+, the DAC Pro, the DigiAMP+, and the Codec Zero.

IQaudio DAC+

The IQaudio DAC+ is the cheapest of them all and it sells for just $20. The DAC+ is built on the PCM5122 DAC (Digital to Analog Converter) chip which offers 12/106-dB stereo DAC conversion with a 32-bit 384kHz PCM interface.

IQaudio DAC Pro — a super audiophile DAC for the Raspberry Pi

This add-on was previously sold for $33.75 but can now be purchased for a lower price of $25. The add-on has the same audio input formats and output connectors as the IQaudio DAC+, but this time the big brother of the PCM5242 DAC chip was used for a better Signal to Noise Ratio. The DAC Pro add-on also features a Pi-DAC headphone amplifier for an all-in-one Full HD audio experience, a 40-pin Raspberry Pi GPIO header and support for Balanced/Differential output in parallel to Phono/RCA line level output.

IQaudio DigiAMP+ — $30

DigiAMP+ integrates a Texas Instruments TAS5756M digital-input amplifier directly onto the HAT, so you can drive a pair of passive stereo speakers at up to 35W per channel.

DigiAMP+ must be powered by an external power source and needs an external supply of 12 ~ 24DC to operate. It can also act as a power source for the HAT and the Pi in parallel.

Codec Zero — $20

This delivers bi-directional digital I2S signals between the RPi and the onboard Dialog Semiconductor DA7212. It includes green LEDs, red LEDs, and a tactile button. It also supports devices like MEMS microphone and mono electret microphone.

More Details

The four audio add-ons are currently available and can be purchased via the usual Pi resellers.

You can visit the company’s products page for further details plus shopping pages. The IQaudio product brief here also has important information about the HATs.

New Kontron COM Express Module with AMD Ryzen Embedded V2000 Processor

Posted on by mixos

Kontron’s COMe-bV26 Computer-on-Module offers up to 8 cores and 16 threads for parallel workloads at the Edge

Kontron, a global leader in IoT/Embedded Computing Technology (ECT), is introducing a brand new COM Express® Basic Computer-on-Module based on the AMD Ryzen™ Embedded V2000 processor. It is the first processor on a COM Express® Type 6 module to support up to 16 parallel threads on up to 8 high-end performance cores. The large number of cores and threads makes the new application-ready COM Express® Basic module ideal for use in next-generation IoT edge devices that must perform more and more parallel processing tasks. At the same time, the high core and thread count also ensures maximum design efficiency, as previously separate applications can now be consolidated in a single system.

Specifications

  • Up to 64 GByte DDR4 memory (2x 32 GByte dual-channel DDR4 SO-DIMM)
  • Up to 8 PCIe lanes (4x PCIe 3.0 (up to 8 GT/s) 4x PCIe 2.0 (up to 5 GT/s))
  • Optional up to 1 TByte NVMe SSD onboard
  • Industrial grade versions available

Target applications for the new high-performance COM Express® Type 6 modules range from multi-device clients and multitask edge systems for the control of entire factories to high-resolution medical imaging systems in operating theatres. Other use cases include advanced multi-display casino game applications for immersive gaming, as well as digital signage installations with multiple displays and parallel streaming of multiple real-time transcoded videos to multiple end devices. Thanks to the high core count, all these applications can also host additional edge functions – such as separate secure edge gateways for secure IIoT connectivity, or AI inferences for edge analytics and situational awareness.

“Manufactured in 7nm technology, AMD’s 8-core high-performance processors open up an entirely new performance class for multifunctional edge systems. With our application-ready COM Express® Basic modules, OEMs can implement this new generation of multi-core embedded processors highly reliably and flexibly, and with very little NRE effort and short time-to-market,” explains Peter Müller, VP Product Center Modules at Kontron. “Compared to alternative designs in a smaller form factor, our COM Express® Basic modules provide more integrated and application-ready functions, as well as more powerful cooling. This makes it much easier to reliably deliver the full performance at 58 W TDP across the approved temperature range of 40° to +85° Celsius at all times.”

more information: https://www.kontron.com/products/boards-and-standard-form-factors/com-express/com-express-basic/come-bv26.html

Enter to win 1 of 5 nRF52 DK Nordic Semiconductor Development Kits

Posted on by mixos

Nordic Semiconductor has partnered with oemsecrets.com to give away 5 nRF52 DK development kits. To enter simply follow the link below for your chance to win.

The nRF52 DK is a Development Kit (DK) that includes hardware, firmware source code, documentation, hardware schematics, and layout files. This kit can be used for developing for the nRF52832, nRF52810, or nRF52805 SoCs.

ENTER NOW

 

The key features of the development kit include:

  • nRF52832 flash-based ANT™/ANT+™, Bluetooth® Low Energy SoC solution
  • Buttons and LEDs for user interaction
  • I/O interface for Arduino form factor plug-in modules

More Information

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