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Category Archives: Research

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PEGMA Test0: Blinking LEDs

The PEGMA boards and parts arrived this week. I was able to successfully populate the board, compile a test project and debug it using the STLINKV2 debugger from STMicro. Here are the bullets: Microcontroller: STMicro STM32F205VC (Originally planned on VG, 1MB flash is overkill) Buck Regulator: TPS62240 Stepping down 5Vusb to 3.3V for both V0 […]

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PEGMA Rev0 Schematic

This week I sent the first revision of the PEGMA board off to Advanced Circuits for manufacture. The final features onboard are as follows: 5 input boost power supplies (1.4V – 6V, 1.5A) 3 output boost power supplies (5V – 14V, 1.5A) 8 peripheral buck power supplies (1.8V – 5.5V, 500mA) Domain 0: Microcontroller only (STM32F205VG), […]

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Biasing An Adjustable SMPS

The PEGMA project uses two types of adjustable switched mode power supplies (SMPS) in multiple configurations. The LM2623 is a boost SMPS; five are used as input power supplies and three are used for peripherals. The TPS62240 is a buck SMPS; one provides power to the STM32F205VG microcontroller and therefore needs to be adjusted between 1.8v […]

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Demultiplexers, Decoders and Addressable Latches

Recently I ran into a problem while working on the PEGMA project and the solution took me a long time to solve. I thought I would take this opportunity to do a bit of 74 series logic review. Let’s say for instance that you had a situation where you wanted to select / de-select some […]

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Design West Review

The Embedded Systems Conference was recently separated into the DesignWest and DesignEast conferences. DesignWest is generally considered to be the larger of the two (DesignEast will not even be held in 2013) and I am very happy to have had the opportunity to attend. This post will focus on the talks / lectures that I […]

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DC/DC Conversion Efficiency

There are various methods for converting DC voltages from one domain to another and there are benefits and drawbacks to each method. I will go over some of the approaches to stepping down voltages in this post and cover some of the factors  involved in determining efficiency. We’ll be covering: Low Dropout Regulators (LDO / […]

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PEGMA Project

My PhD research involves the intelligent allocation of energy to peripherals in low power or energy harvested embedded systems. To that end, I have been designing the PEGMA (Peripheral Energy Generation Measurement and Allocation) board. This board will ultimately enable accurate monitoring and control of both the power generation and consumption of its own peripherals […]

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Design West / Embedded Systems Conference

I will have the opportunity to attend the Design West / Embedded Systems Conference this year. The conference will be held in San Jose, CA from April 22-25. The lineup of presenters is a veritable whos-who of the embedded systems world and I am excited to get the chance to interact with them in person. […]

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