About Circuit Cellar Staff

Circuit Cellar's editorial team comprises professional engineers, technical editors, and digital media specialists. You can reach the Editorial Department at editorial@circuitcellar.com, @circuitcellar, and facebook.com/circuitcellar

1.5-A Synchronous Step-Down DC/DC Converter Delivers 93% Efficiency

Linear Technology’s new LT8608 is a 1.5-A, 42-V input synchronous step-down switching regulator that delivers 93% efficiency while switching at 2 MHz. It is well suited for avoiding critical noise-sensitive frequency bands (e.g., AM radio) while using a compact footprint. Burst Mode operation keeps quiescent current under 2.5 µA in no-load standby conditions. Its 3-to-42-V input voltage range makes it ideal for automotive applications that must regulate through cold-crank and stop-start scenarios with minimum input voltages as low as 3 V and load dump transients in excess of 40 V. Its internal 2-A switches can deliver up to 1.5 A of continuous output current.Linear 8608

The LT8608 maintains a minimum dropout voltage of only 200 mV (at 500 mA) under all conditions. Spread-spectrum frequency modulation and special design techniques offer low EMI operation. In addition, a fast minimum on-time of only 45 ns enables 2-MHz constant frequency switching from a 16-V input to a 1.5-V output. The LT8608’s 10-lead thermally enhanced MSOP package and high switching frequency keeps external inductors and capacitors small for a thermally efficient footprint.

The LT8608’s features and specifications include:

  • Wide input voltage range: 3 to 42 V
  • Ultralow Quiescent Current Burst Mode operation:
    • Less 2.5-µA IQ Regulating 12 VIN to 3.3 VOUT
    • Output Ripple less than 10 mVPP
  • High Efficiency 2-MHz Synchronous Operation:
    • 93% Efficiency at 0.5 A, 5 VOUT from 12 VIN
  • 1.5-A Maximum Continuous Output Current
  • Fast Minimum Switch-On Time: 45 ns
  • Adjustable and Synchronizable: 200 kHz to 2.2 MHz
  • Spread-Spectrum Frequency Modulation for Low EMI
  • Allows Use of Small Inductors
  • Low Dropout
  • Peak Current Mode Operation
  • Accurate 1-V Enable Pin Threshold
  • Internal Compensation
  • Output Soft-Start and Tracking
  • Small 10-Lead MSOP Package

Source: Linear Technology

IAR Systems Supports Wireless Gecko SoCs for IoT connectivity

IAR Systems now supports Silicon Labs Wireless Gecko SoCs, which provide scalable solutions and include Thread and ZigBee stacks for mesh networks, intuitive radio interface software for proprietary protocols, and Bluetooth Low Energy technology for point-to-point connectivity. The IAR Embedded Workbench development provides extensive debugging and profiling possibilities such as complex code and data breakpoints, run-time stack analysis, call stack visualization, code coverage analysis, and integrated monitoring of power consumption. IAR Systems also offers integrated add-on tools for static analysis and run-time analysis.

Support for the Wireless Gecko SoCs is available using IAR Embedded Workbench for ARM, from version 7.60. Free trial versions are available.

Source: IAR Systems

New High-Efficiency Power Supply IC Supports the Power Rules Requirements

Renesas Electronics Corporation recently announced a high-efficiency power supply IC the that supports the Power Rules requirements as defined in USB Power Delivery (USB PD) 2.0 and 3.0 specifications from the USB Implementers Forum (USB-IF). Engineers can use the RAA230161 IC with a wide variety of equipment that uses DC power, such as PC peripheral equipment, office equipment, hub applications, and more. With the IC, system manufacturers can safely implement reliable power supply equipment based on the USB PD 2.0 and 3.0 specifications.

The RAA230161 power supply IC’s features and specs:

  • Achieves an efficiency rate up to a 95% and suppresses heat generation
  • Supports the Power Rules in USB PD 2.0 and 3.0 standards
  • Includes various built-in protection functions for reliable power supply equipment in a minimal amount of space
  • Leads to higher safety and shorter development times with a variety of reference boards that include the IC and a Renesas USB PD 3.0 controller

Samples of the RAA230161 are currently. Mass production is scheduled to begin in September 2016 with a volume of 500,000 units per month.

Source: Renesas Electronics

Engineering, Consulting, & Nonstop Innovation

Engineer and author Robert Lacoste has been designing and innovating for more than two decades. Fortunately for us, Robert is also an excellent writer who regularly publishes Circuit Cellar articles on the “dark” and difficult side of engineering. Over the years, he has taught us about topics ranging from direct digital synthesis to RF mixers to bipolar transistor biasing.

This week, Robert gives us a tour of his consulting company, Alciom, which is based just outside of Paris. He also talks about his electronics equipment and his love for difficult projects.

Rugged RS-485 Transceivers for PROFIBUS-DP Networks

Linear Technology recently introduced the LTC2876 and LTC2877, which are high-voltage-tolerant RS-485 transceivers targeted for PROFIBUS-DP (decentralized periphery) networks. Whether transmitting,  receiving, in standby or powered off, the LTC2876 and LTC2877 tolerate ±60 V on their bus pins, eliminating common damage due to transmission line faults.Linear 2877
LTC2876 and LTC2877 features and specs:

  • Protected from overvoltage line faults to ±60 V
  • ±52-kV ESD Interface Pins, ±15 kV on all other pins
  • Extended common mode range: ±25 V
  • 1.65-to-5.5-V Logic supply pin for flexible digital interfacing (LTC2877)
  • 5-V Supply can operate down to 3 V for low-power, low-swing applications
  • Wide operating temperature range: –40°C to 125°C
  • Available in small DFN and MSOP packages

Source: Linear Technology 

New Synchronous Buck Regulators Offer POL Conversions

Intersil Corp. recently announced a new  family of monolithic synchronous buck regulators that step-down 5- and 3.3-V primary rails to point-of-load (POL) inputs as low as 0.6 V for GPUs, DSPs, SoCs,and FPGAs. The pin-compatible ISL78233, ISL78234, and ISL78235 deliver 3, 4, and 5 A, respectively, of continuous output current to infotainment head units and advanced driver assistance systems (ADAS). intersil isl7823

Using a current mode control architecture to deliver fast transient response and excellent loop stability, the ISL7823x synchronous step-down DC/DC converters integrate low RDSon high-side PMOS and low-side NMOS MOSFETs. Moreover,  they combine a switching frequency of 2 MHz with guaranteed 100 ns (max) minimum on time to avoid AM radio channel interference.

ISL7823x features and specifications:

  • Support input voltage range from 2.7 to 5.5 V and deliver high efficiency up to 95%
  • 100 ns guaranteed phase minimum on time for wide output regulation
  • Adjustable switching frequency from 500 kHz to 4MHz (with 2 MHz default)
  • External synchronization up to 4 MHz
  • Provide 1% reference accuracy for tight regulation
  • Soft-stop output discharge during disable
  • Fault protections  (over-temperature, over-current, output over-and under-voltage, input under-voltage lockout, short-circuit, and negative over-current)
  • AEC-Q100 qualified for operation from –40°C to 125°C
  • Wettable flank QFN package

The ISL78235 5-A synchronous buck regulator is available in a 5 mm × 5 mm 16-lead WFQFN package for $2.75 in 1,00-unit quantities. A 3 mm × 3 mm TQFN package is also available. The ISL78235EVAL2Z evaluation board costs $67.80.

The ISL78233 3-A and ISL78234 4-A synchronous buck regulators are available now in 5 mm × 5 mm 16-lead WFQFN packages. The ISL78233 costs $1.75 in 1,000-unit quantities. The ISL78234 is $1.95 in 1,000-unit quantities. The ISL78233EVAL2Z and ISL78234EVAL2Z evaluation boards cost $56 each.

Source: Intersil Corp.

New Dev Kit for Xilinx FPGA-Enabled Accelerator Cards

BittWare recently announced upcoming availability of an OpenPOWER CAPI Developer’s Kit for its Xilinx FPGA-enabled accelerator cards. The kit is intended to give you a fast way to connect the Xilinx All Programmable FPGA to a CAPI-enabled IBM POWER8 system.

The kit includes:

  • BittWare XUSP3S FPGA accelerator card, which is a ¾-length PCIe board featuring the Xilinx Virtex UltraScale VU095, four QSFPs for 4× 100 GbE, and flexible memory configurations with up to 64 GB of memory and support for Hybrid Memory Cube (HMC)
  • IBM Power Service Layer (PSL) IP to provide the connection to the POWER8 chip
  • CAPI host support library
  • An example CAPI design

 

BittWare’s OpenPOWER CAPI Developer’s Kit is scheduled to be available in Q2 2016.

Source: BittWare

New Embedded Computing Solutions Designed with the Intel Atom x5-E8000 Processor

ADLINK Technology recently released four embedded computing solutions designed with the Intel Atom x5-E8000 processor. The newly-updated COM Express cExpress-BW, SMARC LEC-BW, Qseven Q7-BW modules, and the AmITX-BW-I thin Mini-ITX embedded board offer improved cost-performance ratios.

The latest Intel Atom SoC features 64-bit quad-core processing that is well suited for multitasking applications. The processor offers a configurable TDP (cTDP) of 5 W at 1.04 GHz, enabled by its 14-nm core transistors. With the new processor, ADLINK embedded boards and modules support up to 8 GB of dual-channel DDR3L 1600-MHz memory and up to three independent displays with Intel HD graphics.Adlink

The new COM modules and Mini-ITX board run graphics processing on a base frequency of 320 MHz with eDP/DP/HDMI interfaces for up to three display ports, which is an increase in the number of ports over previous COM Express modules. In addition to 4K resolution, Intel Gen9 Iris Graphics offer excellent 2D/3D hardware acceleration with decoding support for HEVC H.265, MPEG2, MVC, VC-1, WMV9, JPEG, and VP8, and encoding support for HEVC H.265 MVC, and JPEG. Graphics support also includes Open GL for graphics rendering, Intel Quick Sync Video for fast conversion to mobile format, and Intel clear Video HD Technology for better quality video.

ADLINK embedded boards and modules are equipped with ADLINK’s Smart Embedded Management Agent (SEMA), which provides detailed device-level system data including but not limited to temperature, voltage, and power consumption. With access to system activities, you can identify inefficiencies and malfunctions in real-time, thus preventing failures and minimizing downtime. ADLINK’s SEMA-equipped devices connect seamlessly to the SEMA Cloud for remote monitoring. Collected data, including sensor measurements and management commands, are accessible from anywhere at any time via an encrypted connection.

Source: ADLINK Technology

10-Gb LAN with Power Over Ethernet

Würth Elektronik has expanded its portfolio of Ethernet modules with LAN transformers for speeds of up to 10 Gbps. The new transformers support Power over Ethernet (PoE) up to 100 W and currents up to 1 A per channel. Wurth 749053010

WE-LAN 10G has a bandwidth of up to 500 MHz and thus conforms to the IEEE Standard 802.3 with a bandwidth 3.5× larger than comparable gigabit Ethernet products. Thus, the transformers are well suited for applications involving large data volumes or requiring a swift transmission of data (e.g., the transmission of HD video data). In addition, the extended temperature range makes the modules a good option for industrial applications.

Free samples are available on request.

Source: Würth Elektronik

ARM Tools with Extended Static Analysis and Flash Breakpoints

IAR Systems recently announced an updated version of its C/C++ compiler and debugger toolchain for developing ARM-based embedded applications. IAR Embedded Workbench for ARM Version 7.60 adds flash breakpoints functionality and extended static analysis in C-STAT, which performs an analysis on the source code level. In addition to helping developers in ensuring the code quality early in the development cycle, it also detects defects, bugs, and security vulnerabilities as defined by CERT C/C++ and the Common Weakness Enumeration (CWE). It also helps keep code compliant to coding standards such as  MISRA C:2004, MISRA C++:2008, and MISRA C:2012.

C-STAT is fully integrated in the IAR Embedded Workbench IDE. The new update extends the tool with approximately 150 new checks, including 90 new MISRA C:2012 checks and two new packages of checks. Furthermore, there are new options for enabling or disabling the false-positives elimination phase of the analysis and excluding files from the analysis.

The flash breakpoints enable developers to set an unlimited number of breakpoints when debugging the flash memory. With the C-SPY Debugger in IAR Embedded Workbench, you can set various types of breakpoints in the applications you’re debugging. If you use IAR Embedded Workbench with IAR’s I-jet debug probe, you can add an unlimited number of flash breakpoints for selected ARM Cortex-M devices. By setting breakpoints, investigating the status of an application and speeding up the debugging phase is straightforward.

IAR Embedded Workbench for ARM is a handy tool that incorporates a compiler, an assembler, a linker and a debugger into one easy-to-use IDE. It provides advanced and highly efficient optimization features and is tightly integrated with hardware, RTOS products, and middleware. C-STAT is available as an add-on product.

Source: IAR Systems

New 22/40-V Input Power Modules

Exar Corp. recently announced additions to its family of synchronous step-down power modules with input voltage up to 40 V: XR79103, XR79106, XR79203, and XR79206. The XR79103 and XR79106 operate from a 4.5-to-22-V input supply, delivering a regulated output adjustable between 0.6  and 5.5 V. With a 40-V maximum input voltage, the XR79203 and XR79206 add the ability to convert from loosely regulated 24 VDC, rectified 18 VAC and 24 VAC sources. The output voltage can be set from 0.6 to 13.2 V.Exar EX064-1

With Exar’s emulated current mode constant on-time (COT) control, the power modules have fast transient response of conventional COT control loops and provide excellent line and load regulation performance. The modules offer a host of supervisory and protection features for proper sequencing, safe operation under abnormal operating conditions, and light load operation. The combination of wide input voltage range, a thermally efficient package, tight regulation accuracy, and small size makes the power modules well suited for communications, drones, remote vehicles, and a variety of other applications.

The XR79103 (6 mm × 6 mm × 4 mm), XR79106 (8 mm × 8 mm × 4 mm), XR79203 (8 mm × 8 mm × 4 mm) and XR79206 (10 mm × 10 mm × 4 mm) are available in RoHS-compliant, green/halogen free, space-saving QFN packages. Prices start at $4.25, $5.40, $8.50n and $9.95, respectively, in quantities of 1,000.

Source: Exar Corp.

Infineon Embedded Security Selected for Lenovo ThinkPad

Lenovo will use Infineon Technologies OPTIGA Trusted Platform Module (TPM) chips in the new ThinkPad notebooks in an effort to combat security risks. The OPTIGA TPM SLB 9670 chip is designed to increase the data security of laptops and tablet PCs. Sensitive data (e.g., security keys and passwords) can be stored in the TPM chip separately from the main processor.  Infineon - OPTIGA

According to Infineon, the company also supplies embedded security solutions other companies, including Microsoft, Hewlett Packard, and Samsung. The OPTIGA product family provides different levels of security for products as diverse as multiple-server IT infrastructures and MP3 players.

Source: Infineon

Buying Electronics at Lamington Road, Mumbai

Want to see what it’s like buying electronics (e.g., Arduino, displays, and general components) in Mumbai? Circuit Cellar correspondent and videographer Wisse Hettinga joins engineer Nishant Mittal on a tour of Lamington Road, Mumbai, India. This street is famous for the many electronics shops. You can find virtually any component you can think of.


 

“Together with Nishan Mittal, we go inside Lamington Road and discover one of the biggest electronics markets in the world,” Hettinga says. In this video they search for a good price on an Arduino.
 

Check out a free sample issue of Circuit Cellar magazine. If you like what you read, use the link in the sample for a discount subscription — 25% off!

April Engineering Challenge: Find the Schematic Error

The April Electrical Engineering Challenge (sponsored by Technologic Systems) is now live! Review the schematic on the challenge webpage and find the error for a chance to win prizes, such as a TS-7250-V2 High-Performance Embedded Computer or a Circuit Cellar Digital Subscription.

Click to enlarge. Find the error in this schematic and submit your answer by the 20th of the month.

Click to take the Challenge. Find the error in this schematic and submit your answer by the 20th of the month.

Circuit Cellar’s technical editors purposely inserted an error in the schematic diagram. It could be a design error, symbol-related error, value error (e.g., 10k vs 100k), incorrect part usage, or some other problem that negatively affects the electronics. Find the error and submit your answer via the online form by the deadline (2 PM EST on the 20th of the month).

TS7250-V2

Technologic Systems TS-7250-V2

Circuit Cellar will randomly select winners from the pool of respondents who submit the correct answer. For more information, read the Rules, Terms, & Conditions.