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DC205 – Precision DC voltage source

Posted on by mixos

The DC205 low-noise, high-resolution DC voltage source is the right tool when a precision bias source is needed. Its bipolar, four-quadrant output delivers up to 100 V with 1 µV resolution and up to 50 mA of current. In 4-wire mode (remote sense), the instrument corrects for lead resistance delivering accurate potential to your load. The DC205’s output stability is a remarkable ±1 ppm over 24 hours. With its linear power supply, there is no need to worry about high-frequency noise.

Features:

  • ±100 VDC range
  • True 6-digit resolution
  • 1 ppm/°C stability
  • 0.0025 % accuracy (1 yr.)
  • Triggerable voltage scans
  • Low-noise design
  • Linear power supply
  • RS-232, USB and fiber optic interfaces

The DC205 low-noise, high-resolution DC voltage source is the right tool when a precision bias source is needed. Its bipolar, four-quadrant output delivers up to 100 V with 1 µV resolution and up to 50 mA of current. In 4-wire mode (remote sense), the instrument corrects for lead resistance delivering accurate potential to your load. The DC205’s output stability is a remarkable ±1 ppm over 24 hours. With its linear power supply, there is no need to worry about high-frequency noise.

True 6-Digit Resolution

The front-panel display of the DC205 lets you set voltage with true 6-digit resolution. There are three voltage ranges to choose from: ±1 V, ±10 V and ±100 V which allows voltage settings from 1 µV to 100 V — eight orders of magnitude!

Low-Noise Design

The DC205 has outstanding noise characteristics – on the 1 V range, the rms noise is less than 1 µV (0.1 Hz to 10 Hz). It is also accurate to 0.0025 % over a one year period, and it has excellent temperature stability with a specification of less than 1 ppm/°C. The design even features linear power supplies rather than switching power supplies, so switching frequency interference can never be a problem. Click here for a comparison between the DC205 and the Yokogawa 7651.

Scanning

The instrument’s triggerable voltage scanning feature can be useful in a number of experimental applications. The start and stop voltage, scan speed, and scan function can all be controlled. Scan speeds can be set from 100 ms to 10,000 s, and the scan function can either be a ramp or a triangle wave. Single scans and continuous scans are both supported, and the instrument can be triggered from the front panel, remotely over one of the interfaces, or from an external trigger signal.

24 Hour Stability

Bipolar, Four-Quadrant Output

The DC205 can output either positive or negative voltages, and it operates in either grounded or floating mode. In floating mode, the output can float up to 250 V relative to chassis ground. You can also select either 2-wire or 4-wire operation. In 4-wire mode (remote sense), the instrument maintains its preset voltage directly at your load eliminating the effect of lead resistance.

Computer Interfaces

The DC205 has both RS-232 and USB computer interfaces on its rear panel. All functions of the instrument can be set or read via the interfaces. For remote interfacing with complete electrical isolation, the DC205 also has a rear-panel fiber optic interface. When connected to the SX199 Remote Computer Interface Unit, a path for controlling the DC205 via GPIB, Ethernet, and RS-232 is provided.

more information: www.thinksrs.com

Adjustable Constant Current LASER Diode/LED driver

I was testing a couple of low-cost laser diodes that come from china and I was wondering why those diodes don’t have any protection/driver circuitry. Those diodes come with a simple series resistor for current control which is not a good idea nor stable. Laser diodes are harmful and should have some sort of constant current circuit as a basic protection for the laser diode. As result, I built this circuit which provides highly accurate current control.  The module is a great tool to drive low-cost laser diodes with superb accuracy. This circuit can drive diode starting from 0 mA to 115mA, usually, these cheap diodes require around 30mA current. The project has an onboard multi-turn potentiometer to adjust the output current with great accuracy. It is advisable to turn the trim-pot to zero level and then hook-up the laser diode.

To test a diode with this circuit is very easy, the first step is to set the trim-pot to 0 level (fully turned CCW), power the board with 5V DC, check the voltage on the centre pin of trim-pot it should be 0 Volt, then connect the laser diode with a current meter in series, slowly turn the trim-pot Clockwise to set the current as per requirement.  Cheap laser diodes take approx. 30mA current.

The driver can also be used to drive LEDs, operating voltage of this circuit is 5V DC, and maximum load 115mA. Project built using LT1800 precision op-amp.

The LT1800 is a low power, high-speed rail-to-rail input, and output operational amplifier with excellent DC performance. The LT1800 features reduced supply current, lower input offset voltage, lower input bias current, and higher DC gain than other devices with comparable bandwidth. The LT1800 has an input range that includes both supply rails and an output that swings within 20mV of either supply rail to maximize the signal dynamic range in low supply applications. The LT1800 maintains its performance for supplies from 2.3V to 12.6V and is specified at 3V, 5V and ±5V supplies. The inputs can be driven beyond the supplies without damage or phase reversal of the output.

Features

  • Supply 5V DC
  • Load Capacity 0mA to 115mA
  • Can drive both laser diodes or LEDs

Schematic

Parts List

Connections

Gerber View

Photos

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Videos



LT1800 Datasheet

Microchip MCP2518FD : External CAN FD Controller with SPI Interface

Posted on by mixos

The MCP2518FD is a cost-effective and small-footprint External CAN FD Controller that can be easily added to a microcontroller with an available SPI interface. Therefore, a CAN FD channel can be easily added to a microcontroller that is either lacking a CAN FD peripheral or that doesn’t have enough CAN FD channels.

The MCP2518FD supports both CAN frames in the Classical format (CAN 2.0B) and CAN Flexible Data Rate (CAN FD) format as specified in ISO11898-1:2015.

  • Conforms to ISO11898-1:2015
    • Supports both CAN 2.0B and CAN FD
    • Arbitration Bit Rate up to 1 Mbps
    • Data Bit Rate up to 8 Mbps
    • Up to 20MHz SPI Clock Speed
  • Flexible FIFO Setup
    • 31 FIFOs configurable as transmit or receive
    • 32  Transmit Queue
  • Misc
    • 32-bit Time Stamp
    • Bus Health Diagnostics and Error Counters
    • Temperature Range: -40°C to +150°C
    • Packages: VDFN14 (Wettable Flanks), SOIC14
  • Low Power Consumption
    • Low power mode current: 10μA, Max
    • VDD: 2.7V-5.5V
    • Active Current Max: 12mA @ 5.5V, 40 MHz CAN Clock
  • Built-In Safety Features
    • Loopback mode
    • SPI commands with CRC to detect noise on SPI interface
    • ECC for the SRAM 1 bit correction, 2 bit detection

more information: www.microchip.com

Delta T31SN 100W DC/DC family in compact 1/32 brick format

Posted on by mixos

T31SN series of 1/32 Brick, 9~53V input, single output, non-isolated DC/DC converters, are the latest offering from a world leader in power systems technology and manufacturing ― Delta Electronics, Inc.

This product family provides up to 100 watts of power or 8A of output current. With creative design technology and optimisation of component placement, these converters possess outstanding electrical and thermal performance, as well as extremely high reliability under highly stressful operating conditions. Peak efficiency of the module is up to 98.0%.

The modules operate on an input voltage of 9 to 53V with trimmable outputs of between 3.3V to 16.5V and 5V to 30V

As you would expect it meets the latest safety standards of IEC/EN/UL/CSA 62368-1,2nd edition.

Options available include:

  • Negative or Positive Remote On/Off
  • Power Good Signals
  • Through hole pins or SMD pins
  • Open frame or Potted version in a standard or flanged case

The datasheets include application notes on the implementation of the Power Good signals, output voltage adjustment trimming along with many suggestions regarding production set up.

Features

  • High efficiency: 98.0%
  • Industry standard 1/32nd brick form factor
  • Fixed frequency operation
  • Thermal limit, Input UVLO
  • Output OCP Hiccup mode
  • Output voltage trim range: 3.3V to 16.5V, & 5V~30V
  • Output Remote sense
  • Monotonic start up into normal
  • No minimum load requirement
  • Working altitude to 5000m

Relevant Part Numbers and Datasheet Download

more information: www.deltaww.com

Meet the Tigard Board; A new FT2232H-Based USB Serial Adapter/Debuggers

Posted on by Emmanuel Odunlade

SecurityHardware.com is set to take FT2232H-based USB Serial Adapters and Debuggers to the Next Level. The Portland-based company will soon be launching a Crowdfunding campaign for its latest design, an open-source FTDI FT223H-based multi-protocol, multi-voltage hardware hacking device called Tigard.

Tigard is a one-stop board for developers looking for something a little more than the average USB-UART debugging tool. Speaking on the idea behind the product, the team behind Tigard said

“There are plenty of -232H series breakout boards, but they are generally designed to be an easy way to adapt it to a specific use, and not designed for regularly plugging into all different target systems. The two exceptions are the Exodus Intelligence Hardware Interface Board which is not open hardware or commercially available, and TIMEP which is the origin and heritage of this project.”

the company writes.

Tigard features a rich set of features that places it above and beyond a simple serial adapter. It incorporates commonly used pinouts, logic analyzer connection, onboard level-shifting, and labeled wiring harness, specifically for “attaching to and communicating with low-speed interfaces on reverse-engineered hardware targets.”

The board comes with a USB Type-C connector and is made available under the permissive Creative Commons Attribution-ShareAlike 4.0 license.

A look at some of its hardware features:

  • Dual serial interfaces; one completely dedicated to UART, with access to flow control signals and the other shared among dedicated headers for SPI, JTAG, I²C and SWD.
  • Bi-directional level shifters for operations between 1.8 – 5.5V
  • Power supplier switchable between on-board 1.8, 3.3 and 5.0 V and off-board vTarget supplies
  • Switch to choose between I²C/SWD and SPI/JTAG operations,
  • Logic analyzer port to quickly access the device-level signals, and,
  • Some indicator lights to help in the debugging process

What’s more? Its high compatibility with a number of tools and libraries that already support FTDI’s X232H family-like PySpiFlash, USB-serial drivers, UrJTAG, PyFtdi, OpenOCD, Flashrom, PyI2CFlash, and LibMPSSE. This suggests that the board can be used as a simple serial console, a JTAG debugger, an SPI flash chip dumper or an OLED display driver and analyzer.

More details on Tigard can be found on Crowd Supply. The board is yet to be launched on the Crowdfunding page but you can sign up for updates and notifications when the campaign finally goes live.

The project is open source and all hardware design files, documentation and usage are available on the project’s GitHub repository.

Launchpad Launches as a Cheap Arduino Nano alternative

Posted on by Tope Oluyemi

We can’t seem to get enough of Arduino Nano. It has been a “go to” boards for developers since its launch in 2008.  We see developers and engineers try to upgrade the Arduino. This has moved Clyde D. Corpuz to launch the Launchpad, which is a small, Arduino compatible microcontroller development board that does away with the old and dated ATmega328p used in the classic Nano in favor of a newer, cheaper, and equally capable AVR microcontroller (currently an ATtiny1616). The goal of this project

“is to design a board aimed at basic education that can be made for as low as $2. The current version has all the features of the classic Nano (albeit fewer pins), plus a faster 20MHz clock speed, and true analog output.”

Also, the project aims to design and create a low-cost (and probably commercially viable) microcontroller development board that is targeted towards both beginners and experts alike; improves upon the Arduino Uno and Nano, and only costs as little as $2 to manufacture. The board should also be intuitive and easy to use for basic education applications.

 

Launchpad Pinout

Specifications include for the Current Version (Version 1.0) includes:

  • Breadboard-friendly pinout
  • Micro USB  type B connector
  • Microchip ATtiny1616
    • 20MHz clock speed
    • 16kB of flash memory
    • 2kb of RAM
    • 256 bytes of EEPROM
    • 18 I/O pins (1 is currently configured as the reset pin)
    • 8 PWM outputs (8-bit resolution)
    • 12 analog inputs (10-bit resolution)
    • 1 true analog output (0 – 4.3V)
    • UPDI programming interface
    • 1 UART
    • 1 SPI
    • 1 I2C
    • Configurable custom logic (CCL) pins
  • tinyAVR 1-series architecture (similar to the megaAVR 0-series chips on the Arduino Nano Every and Uno WiFi rev2 boards)
  • OptibootX bootloader
  • CH340G USB to serial converter
  • AMS1117 5V LDO voltage regulator
The Board’s Progress

About sales plan, Corpuz says :

“Well, probably. If there is demand I probably will. However, I surely will not be able to sell these at the $2 price mentioned since that only covers the cost of the components and does not include labor and assembly. I’m still assembling boards via hand-soldering so it will take a bit of time and effort to produce.”

Considering the fact that this project is probably the first time Corpuz has ever designed a PCB, we must commend him for his efforts. He says :

“I had to read up a lot on PCB design, concepts, and stuff regarding working with EDA’s. Considering this, I’m very proud of my work and I’m glad to share it all with you.”

The design is open source, and Corpuz will release the design files eventually once He is happy with a version he deevisms “releasable.” Regardless, he is still obliged to release the design files if He puts the board up for sale. For more information on about the board, visit Corpuz’s project page on Hackaday.

Developer Board 4 V3 – Embedded Platform based on Qualcomm Snapdragon 410E SoC

Posted on by mixos

Developer Board 4 V3 is a single board computer based on Qualcomm Snapdragon 410E SoC with 2GB DDR3, 16GB EMMC, HDMI, MIPI-CSI, 40- and 60-pin expansion connectors. Fully structurally compatible with the 96boards CE standard.It features advanced processing power, WLAN, Gigabit Ethernet, Bluetooth, GPS, all packed into a board the size of a credit card.The DB4 V3 is designed for a variety of embedded and IoT categories. These include robotics, cameras, set-top-boxes, wearables, medical devices, vending machines, building automation, industrial control, digital signage etc.

Highlights

  • Compliant with the 96Boards Consumer Edition (CE)
  • Flexible expansion of mezzanine board
  • Custom 64-bit Kryo quad-core CPU up to 1.2GHz
  • Qualcomm® Adreno™ 306 GPU
  • 1-2GB RAM, 8-16GB Flash
  • WLAN 802.11 n/ac Dual Band, Gigabit Ethernet and Bluetooth 4.1
  • Support Linux, Android and Windows 10 IoT core

Qualcomm Snapdragon 410E quad-core

Developer Board 4 features Qualcomm Snapdragon 410E processor, a Quad Core Qualcomm® Adreno™ 306 at up to 1.2GHz clock speed per core, capable of 32-bit and 64-bit operation.

2G + 16G

The utilization of eMMC memory offers an array of benefits in terms of performance security and reliability,resulting in a richer end-user experience

Connectivity: 802.11ac Gigabit Ethernet WiFi, Bluetooth

RJ45 10/1000M LAN provides more stable local network for video streaming.Dual band 802.11ac Gigabit Ethernet WiFi gives wider signal coverage and less interference.

more information: https://shop.geniatech.us/product/developer_board_4_v3/

nRF9160 Feather Launches For $99 With GPS Support

Posted on by Tope Oluyemi

The nRF9160 Feather by Jared Wolff (aka Circuit Dojo LLC) is an electronics development board, which is a system-in-package part of nRF91 series that enables NB-IoT and eMTC (LTE-M) IoT connectivity, as well as assisted GPS. The package is available in an Adafruit Feather form factor. nRF9160 Feather board supports both CAT M1 LTE and NB-IoT for communication with the outside world, and can be powered by a USB power adapter or a LiPo battery and runs Zephyr OS via the nRF Connect SDK.

Specifications for the nRF9160 Feather include:

  • SiP – Nordic Semiconductor nRF9160-SICA LTE-M/NB-IoT/GPS SIP with Arm Cortex-M33 MCU, 1024 KB flash, 256 KB     SRAM
  • Storage – Onboard 4MB NOR flash (note: upgraded from initial 2MB)
  • Cellular Connectivity – LTE Cat-M1 (eMTC) and LTE NB1/NB2 (NB-IoT) plus 4FF SIM card slot, and u.FL connector for an external antenna
  • GNSS – Built-in assisted GPS support plus u.FL connector for an external antenna
  • Expansion – Feather I/Os (12+16 through holes) with digital and analog I/Os, I2C, UART, SPI, RST, 3.3V, VBAT, GND
  • Debugging & Programmer
  • Serial console via micro USB Port connected to onboard USB to serial chip
  • Support for Jlink and CMSIS-DAP based programmers using a Tag Connect TC2030-CTX-NL over Serial Wire Debug (SWD)
  • Misc – “Uber” low-power RTC, reset button, user button
  • Power Supply
  • 5V DC via Micro USB port
  • 2-pin JST header + charger IC for LiPo battery (300 mAh or more required)
  • Power Consumption – 2µA of current in standby mode
  • Dimensions – 50.8 x 22.86 mm (Adafruit Feather form factor)
  • OSHW Certifications – US000664

About the board, Jared Wolff says

“The nRF9160 Feather is a true Feather, and then some, board. As you would expect, It works well across both USB and LiPoly batteries. The board is designed to be nice to your batteries. Not only can you take advantage of Nordic’s advanced power states, but you can also put the device into a low power standby state. Laboratory measurements are putting that mode at about 2µA of current. 2µA! The nRF9160 Feather is also designed to take harness every last mW your battery has to offer. That means from full-to-empty it’s using every last mW your battery has to offer. It runs at 3.3V and can support and work with most Featherwing boards!”

You don’t need an external programmer, you can just load your applications directly to the nRF9160 Feather. This helps save you from extra costs associated with getting started with your nRF9160 Feather. Also, the MCUBoot boot-loader and command-line tools have been tweaked to boost loading speeds by 10x. This makes loading via the boot-loader almost as fast as using an external programmer!

nRF9160 Feather enclosure

This campaign is courtesy Hackster Launch, which is a collaboration between Hackster.io and GroupGets. The board is certified by the Open Source Hardware Association. This means you can build yours with the available files. With the hardware licensed with CERN 1.2, mcuboot firmware with Apache 2.0, and documentation with CC-SA-4.0. nRF9160 Feather board goes for $99 with an LTE/NB-IoT Antenna and a Hologram Cellular IoT SIM card, with additional options which includes a $10 GPS antenna, and a $19 enclosure with GPS antenna and 18650 battery holder. Campaign scheduled end date is Wed, 19 Aug 2020 20:00:00 PDT. You can find more information on GroupGets’ campaign page.

Free Elektor Article: The RV-3029-C2 “Swiss Clock”

Posted on by mixos

Off-air awfully accurate drop-in RTC & calendar on I²C

This RTC & Calendar board is built around Micro Crystal’s type RV-3029-C2 integrated circuit. The ‘3029 is a real-time-clock/calendar (RTC) cheerfully communicating via the I2C protocol. It offers good precision out of the box, and fine precision when tweaked.

Features:

  • Micro Crystal RV-3029-C2 RTC/Calendar chip
  • Battery backup
  • Selectable clock output
  • 6 ppm max. error default
  • 3 ppm error achievable with DTCXO tweaking
  • I2C connectivity
  • Free Arduino test & config utility
  • Drop-in module

Free Elektor Article: The RV-3029-C2 “Swiss Clock” – [Link]

Avnet’s Renesas ZMOD4410 Indoor Air Quality HAT for Raspberry Pi

Posted on by mixos

Sensor HAT based on Renesas ZMOD4410 module accelerates design of products requiring indoor air quality measurement capabilities

Avnet’s Renesas ZMOD4410 Indoor Air Quality HAT for Raspberry Pi is an evaluation, development and quick-prototyping tool intended for professionals developing a wide variety of mains-powered and battery-powered products with indoor air quality monitoring capability. The HAT features an on-board calibrated ZMOD4410 sensor that measures the concentrations of Total Volatile Organic Compounds (TVOC) and can estimate carbon dioxide (eCO2) levels. These are important indicators for monitoring indoor air quality. All sensors are electrically and chemically (gas) tested with calibration data stored in the ZMOD4410’s built-in nonvolatile memory.

In addition to the ZMOD4410 sensor, the HAT incorporates a Renesas HS3001 Precision Relative Humidity and Temperature Sensor, along with software-controlled status LEDs.

In certain applications, it may be desirable to shift the ZMOD4410 sensing element’s chemical selectivity and sensitivity, or to model its operation at supply voltages other than 3.3V. The HAT facilitates this with a user-adjustable power supply; a jumper selects the default fixed 3.3V supply or one which can be set from 1.75V to 3.9V. The HAT also provides connection points to measure the ZMOD4410 current consumption. This may be useful when integrating the sensor and its software into an extended-life battery-powered product.

Please note that algorithm libraries developed by Renesas are required to operate the ZMOD4410 sensor and convert its data into TVOC and eCO2 measurements. These algorithm libraries are not included with the HAT, but are available directly from Renesas subject to the terms and conditions of Renesas’ Software License Agreement. An application for the ZMOD4410 Software License Agreement, along with the procedure to download the algorithms and related confidential data, is available here.

To validate the HAT’s operation and begin measuring TVOC and eCO2 “out of the box” with a Raspberry Pi solution, Avnet provides a pre-compiled test application built with those algorithm libraries that runs under the Raspberry Pi operating system (formerly Raspbian).

Benefits:

  • Convenient Raspberry Pi HAT form factor for evaluation, development and quick prototyping of products that monitor indoor air quality
  • Detects a wide range of TVOC, from parts-per-billion to parts-per-million and provides eCO2 levels
  • Sensors are chemically tested and factory calibrated
  • On-board user-adjustable power supply option and current measurement connection points
  • Configurable alarm/interrupt output
  • Supplied with pre-compiled Raspberry Pi OS test / validation application
  • Renesas offers licensed downloadable compiled code, enabling a product road map of indoor air measurement innovation

Target applications:

  • Smart home appliances
  • Smart thermostats
  • Smart speakers
  • Smart fans
  • Smoke alarms
  • Vacuum cleaners
  • Garage openers
  • Security systems
  • HVAC controls
  • Air purifiers
  • Building automation

Software downloads:

  • Download the “out of the box” test/validation application for the HAT which is a pre-compiled application built with Renesas’ ZMOD4410 algorithm libraries and runs under the Raspberry Pi OS.
  • Download Renesas’ Software License Agreement and procedure to download the ZMOD algorithm libraries and related confidential data.

more information: www.avnet.com

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