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Multiphase Oscillator with 40% Spread Spectrum Frequency Modulation and 250Khz Output Frequency

This is a precision, low power, and easy-to-use oscillator that provides multiphase outputs. The output frequency of the project is set to 250Khz, with 40% spread spectrum. The oscillator frequency can be set by resistor R1, and the spread spectrum can be changed using R3. The master oscillator is controlled by the RSET resistor R1 and has a range of 100khz to 20Mhz. In order to accommodate a wider output frequency range, a programable divider, (divide by 1, 10, 100) is included and can be set using jumper J1.  The integrated programmable multiphase circuit provides either 2, 3, or 4 phase waveforms. The LTC6902’s SSFM capability modulates the oscillator’s frequency by a pseudorandom noise (PRN) signal to spread the oscillator’s energy over a wide frequency band. This spreading decreases the peak electromagnetic radiation level and improves electromagnetic compatibility (EMC) performance. The amount of frequency spreading is programmable by a single additional external resistor R3 (RMOD). Refer to 4 Phase output waveform diagram.

Features

  • Power Input 5V DC
  • Default Output Frequency 250Khz
  • Default Spread Spectrum 40%
  • Jumper for Frequency Division
  • Jumper for Multiphase Mode
  • 4 Phase Outputs
  • PCB Dimensions 20.16 x 15.88 mm
Note: The module can be configured as per the requirement of frequency output and spread spectrum percentage, refer to the datasheet of LT6902 for more information. By default, the circuit is set for 250Khz output with 40% spread spectrum with RSET-R1= 20Kohms, Jumper J1 Open, Jumper J2 Connect to VCC, and Rmod(R3) = 10Kohms.

LTC6902 Internal Diagram

Example: 4 Phase, 250Khz Clock with 40% Spreading

  • Connect Ph Pin Jumper J2 to VC= Selects 4 Phase Mode, M=4
  • Leave Jumper J1 Open N=10 Division
  • RSET(R1) =20KOhms Sets F-Out=Fmax=250Khz
  • Rmod(R3) =10Kohms Sets the Spreading to 40%

Multiphase Mode, Setting M

  • 2-Phase: Connect Jumper2 to GND   M=1
  • 3-Phase: Leave Jumper J2 Open        M=3
  • 4-Phase: Connect Jumper J2 to VCC M=4

Choosing Programmable Divider Setting (Frequency Divider Setting Jumper J1)

  • Jumper J1 Connect to GND = 2.5Mhz Output Frequency
  • Jumper J1 Leave Open = 250khz Output Frequency
  • Jumper J1 Connect to VCC = 25Khz Output Frequency

Calculating the RSET Resistor Value

  • Maximum Frequency excursion (Fmax) is equal to F-Out.
  • RSET(R1) =20Kohms(10Mhz/N*M*F-Out)
  • N=100,10,1 (Jumper J1)
  • M=4,3,1 (Jumper J2)

Calculating the RMOD Resistor Value

  • Rmod=20xRSET/Spreading Percentage
  • Where the spreading Percentage is defined by the following:
  • Spread Percentage =100xFmax-Fmin/Fmax
  • Where Fmax is the highest frequency Excursion (Set by the RSET Value) and Fmin is the lowest frequency excursion

Applications

  • Switching Power Supply Clock Reference
  • Portable and Battery-Powered Equipment
  • PDAs, Cell Phones
  • Clocking Switched-Capacitor Filters

Schematic

Parts List

NOQNTY.REFDESC.MANUFACTURER/SUPPLIER
11CN16 PIN MALE HEADER 2.54MM PITCHDIGIKEY S1011EC-40-ND
21C110uF/16V SMD SIZE 1206YAGEO
31C20.1uF/50V SMD SIZE 0805YAGEO
42J1,J2JUMPER3P/SHUNT 2.54MMDIGIKEY S9001-ND
52PR1,R2DNPOMIT
61R120K 1% SMD SIZE 0805YAGEO
71R310K 1% SMD SIZE 0805YAGEO
81U1LTC6902DIGIKEY LTC6902CMS#TRPBFCT-ND

Connections

Output waveforms

Gerber View

Photos

Video

LTC6902 Datasheet

Dual-Level Float-Cum-Boost Charger with Pre-Charge for 12V – 3 to 6Ah Sealed Lead Acid (SLA) Batteries

Posted on by mixos

This SLA Battery charger project is the right choice if you want to obtain maximum battery service life and capacity, along with acceptable recharge time and economy, constant current, constant voltage, and even charge a deeply discharged battery. The project contains all the necessary circuitry to optimally control the charging of valve-regulated lead-acid batteries. The circuit controls the charging current as well as the charging voltage to safely and efficiently charge the battery, maximizing battery capacity and life. The circuit is configured as a simple dual-voltage float-cum-boost charge controller. It is configured for charging 3 to 6Ah, 12V SLA batteries with dual-level float-cum-boost charger with pre-charge function and provides 500mA current output. The circuit also helps to charge deeply discharged batteries with pre-charge function. In this function Pin 12 (CE) detects the battery voltage, if the voltage at pin12 (CE) is bellow V-ref (2.3V), enable comparator permits a pre-charge current IPRE to flow from the PRE-CHG pin through Resistor R7 into the battery.

Dual-Level Float-Cum-Boost Charger with Pre-Charge for 12V – 3 to 6Ah Sealed Lead Acid (SLA) Batteries – [Link]

Espressif Systems has announced a new ESP32-C6 WiFi 6 And Bluetooth 5 LE RISC-V SoC For IoT Devices

Posted on by Emmanuel Odunlade

Well, it seems Espressif Systems has not been resting on their oars as we have to see quite some interesting products from them lately.

Towards the end of last year, the company successfully launched their very first RISC-V wireless SoC with ESP32-C3 single-core 32-bit RISC-V SoC offering both 2.4GHz WiFi 4 and Bluetooth 5.0 LE connectivity. Now they have announced another RISC-V processor with ESP32-C6 single-core 32-bit RISC-V SoC clocked @ up to 160 MHz with 2.4 GHz WiFi 6 (802.11ax) and Bluetooth 5 LE connectivity.

As noted by Espressif Systems, the ESP32-C6 is basically the same as the ESP32-C3 but with WiFi 6 radio.

“ESP32-C6 is unique in that it packs 2.4 GHz Wi-Fi 6 (802.11ax) radio that also supports the 802.11b/g/n standard for backward compatibility. This Wi-Fi 6 support is optimized for IoT devices, and the SoC supports a 20MHz bandwidth for 802.11ax mode and a 20/40MHz bandwidth for 802.11b/g/n mode. The 802.11ax mode supports a station interface, and it offers greater transmission efficiency and lower power consumption.”

Here are some of the key features and Specifications that we expect to see in the ESP32-C6 chip:

  • 32-bit RISC-V single-core processor clocked at up to 160 MHz
  • 384KB ROM
  • 400KB SRAM (16 KB for cache)
  • 8KB SRAM in RTC
  • SPI, Dual SPI, Quad SPI, and QPI interfaces for external flash and/or PSRAM
  • 2.4 GHz 802.11ax Wi-Fi 6 with 20 MHz bandwidth
  • 2.4 GHz 802.11b/g/n WiFI 4 with 20/40MHz bandwidth, 1T1R mode with data rate up to 150 Mbps
  • Bluetooth 5 LE radio with support for long-range operation and support for 2 Mbps of high throughput PHY.
  • Up to 22x GPIOs
  • 2x 12-bit SAR ADCs, up to 6 channels
  • 3x SPI, 2x UART, 1x I2C, 1x I2S
  • Remote control peripheral, with 2 transmit channels and 2 receive channels
  • 1x Temperature sensor
  • LED PWM controller, up to 6 channels
  • Full-speed USB Serial/JTAG controller
  • General DMA controller, with 3 transmit channels and 3 receive channels
  • 1x TWAI controller compatible with ISO 11898-1
  • Power Management Unit with five power modes
  • Security Features: RSA-3072-based secure boot, AES-128-XTS-based flash encryption, digital signature, HMAC peripheral for identity protection, and cryptographic accelerators for improved performance

The processor will be supported by the company’s mature IoT Development Framework (ESP-IDF) as well as the ESP-Hosted and ESP-AT firmware for those who would want to control the new processor from an external host.

Pricing and availability details are still unknown but you can contact the company’s customer support team if you have any questions or inquiries concerning the WiFi 6 processor. Further details may be found in the press release.

Pokit Pro is World’s Smallest Wireless Multimeter, Oscilloscope, and Logger

Posted on by Saumitra Jagdale

We saw Pokit Pro’s second Kickstarter campaign in late 2019. It was a crowdfunding project with AU$30,000 and counting in the November end of 2019. The company’s current press release in 2021 says Pokit PRO has raised over AU$1.66 million from nearly 10,000 backers. Pokit Innovations also claims that it is the most funded DIY Electronics product ever on Kickstarter. Also, it is in the top 5 most funded Australian Kickstarter projects till now.

Pokit Pro is all in one multimeter, DSO, and logger for portable electronics testing and measurements. Hence, it is an excellent option for makers, technicians, and engineers as its portable feature allows them to carry it anywhere they want. Adding more to the mobile quality, the device has a pen-style design structure that can easily fit in the pockets. Also, the Pokit Pro is budget-friendly without a “prohibitive price tag.”

You might have seen numerous multimeters and DSO, which have a lot of specifications. But Pokit Pro comes with wireless functionality, enabling connectivity to the smartphone app to measure a wide range of electrical and electronic quantities. These quantities include voltage, current, resistance, capacitance, and temperature. So, the wireless connectivity is via Bluetooth technology with a range of 10 meters. Further, Pokit Pro also allows continuity and diode checking in complex circuits.

Technical Specifications of Pokit Pro

Multimeter

  • Voltage measurement of 10mV to 600V DC, 600V AC (RMS) with CAT III. Also ±1% tolerance
  • Current measurement range from 1mA to 10A max with ±1% tolerance
  • Resistance Measurement from 1 to 1M Ohm with ±5% tolerance
  • Temperature from 1 to 60°C ±1%°C and 34°F to 140°F±1.8
  • Diode check and continuity check functionalities
  • Maximum continuity check delay of 10ms
  • The continuity buzzer feature comes with an internal buzzer

Oscilloscope

  • Voltage measurement of 10mV to 600V DC, 600V AC (RMS) with CAT III. Also ±1% tolerance
  • Current measurement range from 1mA to 10A max with ±1% tolerance
  • Sampling specification of 12bits and 1M sample/sec
  • DC input impedance of 1M ohm

Logger

  • Logging parameters include voltage, current, and temperature
  • Logging capacity of 256kB and1.8min/sample at 6 months
  • Sample rate of 100ms to 18hr

Pokit Innovations claims that

“Pokit’s harnessing of the power of smartphones has revolutionized the way test and measurement tools are used. Hence, there is no other tool which brings such power, accuracy, and functionality in such a small package.”

The Oscilloscope of Pokit Pro comes with additional features like an acquisition button, continuous sampling, trigger, and multichannel measurements. Channel naming, RGB channel identification, and Digital Fourier Transform are also some of the functionalities.

Pokit Pro is ideal for electronics and automobile applications. It is also a great fit for home electricals and technical testing use cases. Pokit Pro is available for preorder at $119 USD. For more information visit the official product page of Pokit Pro.

Technical specifications and images have also been taken from the product page.

Crowbits – Learning Coding Tool

Posted on by Tope Oluyemi

Elecrow launched a campaign on Kickstarter for Crowbits magnetic electronic blocks for STEM education. Crowbits are coding toys that come with 80+ electronic blocks, kids-friendly graphical programming software, 5 different themes kits, Lego bricks, with three different sizes ( large, middle, and small modules) of different colors with blue used for power control and logic control, green for output, yellow for input, and orange for advanced programming. Out of the 80+ modules, around 30 can be used without programming at all. Crowbits is compatible with Arduino, ESP32, Raspberry Pi, and Micro:bit boards.

Crowbits come with multiple main controller modules, input modules, and output modules. Your children are provided with detailed lessons to help them start quickly. Even if they are new to electronics or coding, or they have basic knowledge, let them choose their favorite one to get started. Crowbits Hello kit and Explorer Kit, helps your kids build projects with cardboard, LEGO-compatible blocks, or other materials you want. Crowbits no-coding mode helps diverts your kid’s attention from their screens and into a new world of thoughtful playtime. About Crowbits, the company says:

“Crowbits help your kids learn how to code, it’s not necessarily about learning one of these languages or actually building websites. Far from it, we care more about your child beginning to understand the building blocks in the correct order, usually logical thinking, results in actions happening as planned. Just drag and drop the coding blocks, then program the robots to do things.”

Now, to the coding kits, there are 3 coding kits based on Crowbits, Inventor Kit, Creator Kit, and Master Kit respectively. The Inventor Kit is based on micro:bit, with the four-in-one car which features obstacle avoidance function, line patrol function,  gesture control function, and Bluetooth remote control function. This helps improve your kid’s cognitive function and hand-eye coordination. The Creator Kit is based on Arduino, which features Bluetooth wireless connection mode, and is for more advanced learners. The Master Kit features an ESP32 board and TFT display for more complex projects like a phone, game console (supports 300+ open-source games), or a security radar.

As a STEM toy, Crowbits teaches kids science, technology, engineering, and math skills in a fun and immersive way, which helps strengthen their logical, problem-solving, and creativity abilities. Crowbits are suitable for kids from age 5 to 18 years old. One good thing about Crowbits is that your child doesn’t outgrow it, because they may still be learning new things and taking on new challenges with the toy as they are growing. It cuts across ages and abilities, helping to foster curiosity and interest in STEM for all kids.

Crowbits are easy to use because of the magnetic snaps on Crowbits. All you do is align the magnetic Pogo pin connectors. Crowbits is designed with LEGO-compatible holes on the back and pins on the side, which enables your kid’s mix and match them with their LEGO blocks, combining them with the classical block toys for an even more thrilling sort of educational fun. The coding skills are available in three difficulty levels, kids can start with no coding, move to light coding, and then move to full coding. The company offers a custom-built Lets code on Scratch3.0 as the graphic programming software for Crowbits. This enables kids to program and build interactive projects by dragging and dropping blocks. As their coding skills improve, they can switch to Python, Java, and other text programming languages for further learning.

All Crowbits modules are kid-friendly, with the safety round corner design, safety low voltage operation, large particle design, and certified ABS material, kids can use Crowbits without worrying about breaking anything.

Crowbits is available now, and you can find more information on their website.

Fibocom Launches 5G Smart Module SC161 Based on Qualcomm QCM6350

Posted on by mixos

Fibocom, a leading provider of cellular embedded wireless module solutions for the Internet of Things (IoT), announced the world-wide launch of 5G smart module SC161. Integrated with high bandwidth, low latency and strong computing power, SC161 is designed to satisfy the wireless communication needs of industries that require powerful computing ability and local computation.

The newly-launched SC161 module is based on Qualcomm QCM6350, coming with a high-end Octa-core platform 2A77 2.0GHz +6A55 1.7GHz processor and vDSP (visual Digital Signal Processor). Supporting 5G standalone network (SA) and non-standalone (NSA) network architectures, Fibocom’s SC161 module is backward compatible with 4G/3G network standard. Combining with 5G high-speed and high-computing capability processor, the module is capable for multi-channel capturing and image processing with high performance and low power consumption.

It is worth noting that the 5G smart module SC161 integrates a high-performance graphics engine to allow smooth 4K video playing and multi-channel camera input. Fibocom SC161 module supports a variety of long-distance communication modes as well as Wi-Fi/Bluetooth short-distance wireless transmission technology. In addition, the module supports high precision GNSS wireless positioning.

Fibocom’s SC161 module presets open Android operating system with rich extension interfaces such as MIPI/USB/UART/SPI/I2C, making it a preferred solution for the core system of wireless intelligent products. Fibocom SC161 can be widely applied in IoT scenarios such as smart wireless payment, C-V2X, smart cities, smart home, robot, VR, AR, etc. It is an outstanding core system solution for global IoT applications.

“The mass production of Fibocom SC161 smart module is planned to start in Q3 2021,” said the director of product management, Fibocom. “We are honored to introduce the new SC161 modules for global customers, which is an excellent addition to our 5G wireless module family. I believe Fibocom’s leading 5G smart modules will bring unprecedented benefits into various industries and business, helping to build a higher level of smarter world.”

more information: https://www.fibocom.com

Robotic Bartender – What can a $99 Arduino-compatible controller and 6 BLDC servo motors do?

Posted on by mixos

Teknic’s Robotic Bartender uses 1 of Teknic’s new ClearCore controllers (Arduino compatible) and 6 ClearPath integrated servo motors. We challenged a small team of engineers to demonstrate the flexibility and power of the new controller. They came up with a robotic bartender that lets you order one of 130,000 possible drink combinations for the perfect cocktail.

See the robotic bartender demo that “is a mix of fun and serious engineering”.

What are the capabilities of one ClearCore?

  • Control up to 4 steppers, or digital servos such as ClearPath.
  • 13 software-configurable analog and digital I/O points.
  • Compatible with 24-volt industrial actuators and sensors.
  • Rich, well-documented selection of example code projects for Atmel Studio 7.
  • Optional Arduino Wrapper Library to code using the lightweight Arduino IDE. Perfect for rapid prototyping and small projects.
  • 90 day money-back guarantee; 3-year warranty.

What are users saying on Google Reviews?

  • “Both ClearLink and ClearCore have truly been designed with industrial applications in mind and offer a ton of capability at a fraction of the cost and size of a PLC based system.” – Ivan Chousal
  • The ease of use and all-in-one package of the ClearPath motors is incredible. The only thing more impressive than the motor is the customer service.” – Cecil Baird
  • “We have been incredibly impressed with every facet of Teknic, Inc. As an OEM that will have systems in the field worldwide for multiple decades their promise of continuing to make available legacy products to support our customers also impressed me.” – John Cantrell

About Teknic, Inc.

Founded in 1985, Teknic manufactures a wide range of servo motion control components. Our products include integrated servo systems, brushless servo motors, servo drives, motion controllers, and power supplies. Teknic designs and builds products in the USA (Victor, New York) and provides factory-direct support to Original Equipment Manufacturers (OEMs). Contact Teknic at 585-784-7454 to speak directly with a knowledgeable engineer or leave a message online at https://www.teknic.com/contact/.

Murata Power Solutions MYR Series Ultra-small .5A to 2A DC/DC Converters

Posted on by mixos

Murata’s MYR series are the PicoBK™ DC/DC converters that integrate a coil and a control IC. The ultra-small form-factor measures 2.5 mm x 2.0 mm x 1.0 mm. The MYR series is significantly smaller than discrete solutions. In most cases, these modules occupy less than half the footprint of the same solution implemented with discrete components.

These DC/DC converters achieve high efficiency, low noise, and high heat dissipation. The devices are designed for a 2.5 V to 5.5 V source such as a Li-ion battery. The input voltage of the MYRGC series is up to 36 VDC and suitable for battery applications to industrial applications. The typical efficiency of the MYRGP is 93% at 5.0 VIN / 3.3 VOUT. The control method can be selected fixed, PWM, or PFM/PWM auto switch.

These environmentally friendly, low power consumption step-down DC/DC converters are in stock at Sager Electronics. Free samples available for qualified programs.

Features:

  • Designed for battery-powered applications
  • Very small SMT footprint
  • Efficiency 93% (typ.)
  • Low quiescent current
  • Excellent EMI and thermal performance

more information: https://power.sager.com/manufacturers/murata-power-solutions/murata-power-solutions-myr-series-ultra-small-5a-to-2a-dc-dc-converters/

Broadcom AEDR-9920 three-channel reflective incremental encoder

Posted on by mixos
The AEDR-9920 miniature reflective incremental encoder offers three-channel (ABI) differential digital outputs for linear and rotary applications

The AEDR-9920 miniature reflective incremental encoder offers three-channel (ABI) differential digital outputs for linear and rotary applications starting at 4.6 mm optical radius with larger spatial (misalignment) tolerance up to 500 µm. A smaller optical radius can be achieved with a lower spatial and support the lower resolution with a spiral code wheel. The differential or TTL-compatible output signals can be directly interfaced to most signal processors. The compact size and programmable resolution provide easy integration into small motors, actuators, linear stages, and medical equipment.

Key features

  • Miniature size – 4x4mm
  • For miniature, small motor, and high temp applications
  • Built-in pin selectable and user SPI reprogrammable interpolations
  • Suitable for linear and rotary applications

Additional features

  • Next-generation miniature reflective incremental encoder:
    • High operating temperature, resolution, and frequency
  • Operating Voltage 3.3 V and 5 V
  • Encoding line density: 225 LPI (8.86 LPmm)
    • Example: Rotary RoP 4.6 mm, to achieve 256 CPR
  • Higher resolutions with pin selectable interpolation up to 256x
    • 65,536 CPR or 262,144 PPR after quad
  • User SPI reprogrammable interpolation from 1x up to 512x
  • Base frequency 200 Khz and up to 2 Mhz at 16x interpolation and above
  • Infrared (IR) light source:
    • More robust to contamination
  • Surface-mount leadless package (W x L x H):
    • 4.0 × 4.0 × 1.05 mm
  • Operating temperature range:
    • From -40 to 115 °C (extended industrial)
  • Optional automotive part AEDR-9920A:
    • AEC-Q100-compliant
    • Automotive Grade 1: from -40 to 125 °C

more information: https://www.broadcom.com/products/motion-control-encoders/incremental-encoders/reflective-encoders/aedr-9920

Omron’s P-SON 4-pin, high-current, and low ON resistance type relays

Posted on by mixos

Omron expands its MOSFET offerings with the G3VM-31WR(TR05), G3VM-61WR(TR05), and G3VM-101WR(TR05) relays in the P-SON package. Omron’s P-SON package has a terminal shape that improves solder stability and offers better solder visibility. The output terminal pad has been expanded to allow higher current within the small package.

Features

  • G3VM-31WR(TR05) P-SON package
    • Small with high current
    • Allows better solder shape
    • Improved radiation performance
    • High current: 4.5 A continuous load current
    • -40°C to +110°C ambient temperature: allows for higher design flexibility
  • G3VM-61WR(TR05) P-SON package
    • Small with high current
    • Allows better solder shape
    • Improved radiation performance
    • High current: 3 A continuous load current
    • -40°C to +110°C ambient temperature: allows for higher design flexibility
  • G3VM-101WR(TR05) P-SON package
    • Small with high current
    • Allows better solder shape
    • Improved radiation performance
    • High current: 2 A continuous load current
    • -40°C to +110°C ambient temperature: allows for higher design flexibility

more information: https://omronfs.omron.com/en_US/ecb/products/pdf/k334-e1.pdf

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