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Recent content by ejleiss

  1. E

    Miller Decoder State machine

    Hello, I'm looking for some assitance in working out a miller decoder using an FPGA and state machines. If anyone has some familiarity with this I would greatly appreciate some insight. Thanks
  2. E

    WIZ110SR simple test

    Hello, I've been trying to work with the WIZ110SR to setup a quick test between the gateway and a serial port on another computer. I can't seem to get things working correctly. Once the setup parameters are loaded to the WIZ I should be able to communicate using RealTerm or any other...
  3. E

    RF430CL330H interrupt clear problem

    Hello, Has anyone ever used the RF430CL330H NFC/RFID breakout board? I am having a problem clearing the interrupt flag. I set my registers to the following values: INT_ENABLE = 0xFF, 0xFA, 0x06, 0x00 --> End of Read/End of Write Enabled CONTROL_REG = 0xFF, 0xFE, 0x16, 0x00 --> INTO...
  4. E

    microcontroller system clock related to SPI clock source

    I guess my real question is.. I am running my microcontroller clock with the 32MHZ inernal RC, my SPI device would ideally like to have a clock speed of 2MHZ. Is there a limit to how low I can set my micro clock (to save power) without screwing up my SPI device? Thanks
  5. E

    microcontroller system clock related to SPI clock source

    Hello, Is there a rule of thumb for microcontroller system clock speed, when using SPI? For example, I am using a SPI to communicate with a sensor where in the sensors datasheet it says to use an SPI clock speed of no less than 2MHZ. My question is, how is my microcontroller system clock...
  6. E

    RFID development kit with Xmega256

    Hello, Not sure if this is the right place to post this, but I'm looking for a good RFID tag/reader development kit to use with the Xmega256 microcontoller. Any insight is appreciated. Thanks
  7. E

    Calculate minimum baud rate required

    Hello, I am trying to figure out the minimum baud rate required for my data transfer via microcontroller UART. I have an spi device that samples at 3200Hz (spi running at 2MHz) and I place these samples in a frame consisting of 16 total bytes. What is my minimum serial baud rate to ensure...
  8. E

    ADXL345 and XMEGA256 SPI

    Hello, I'm having some trouble with the ADXL345 communicating via 3 wire SPI on my XMEGA256. I am using Atmel Software Framework with the XMEGA. If anyone has done this before I would appreciate some direction initiating the accelerometer to stream data. Here is what I have...
  9. E

    Battery tapping / multiple voltages from battery banks

    Hello, My issue has to do with obtaining multiple voltages from a battery bank. I have twenty four 3.6V battery cells that I want to wire to get about 43 volts, 36 volts and 12 volts. I know that just tapping off at the desired voltage is not the best way to do this due to unequal loading and...
  10. E

    Determine RF power output

    Hello, I am playing around with an RF transmitter and I am looking at the output carrier wave on a signal analyzer. The output on the analyzer is measuring -7dBm. If someone were to ask what is the RF output power level, how do I explain this in terms on mW or Watts? Thanks
  11. E

    Current capacity with positive and negative voltage supply

    Hi, I have a power brick that will output +/-12V @ +/-500mA. Is it correct to assume that is 500mA for the +12 as well as the -12V for a total of 1A? Also, if the positive supply is drawing more than 500mA... will it just take what it needs from the negative portion? In other words, if my...
  12. E

    AD9910/PCBZ external control setup

    Hello, I am having some trouble setting up the AD9910/PCBZ evaluation board via external control from an Atmel XMEGA. I think my main problem is the IO update. I would like to use the automatic IO update so that I don't have to rely on an external signal on the line to sync command. Any help...
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    AD9910 Timing and single tone mode programming

    Hi, I am wondering if someone who is familiar with the AD9910 DDS could write a quick pseudo code operation that illustrates how to correctly program the AD9910 through serial SPI for single tone operation? Thank you.
  14. E

    Need help tracking down IC for frequency modulation

    Hello, I am trying to locate a frequency mixer or multiplier to use for FM modulation. I currently have an FSK waveform that I created via a DDS and would like to apply this waveform to a carrier frequency signal to produce a final frequency modulated output. I have also already created the...
  15. E

    Frequency Modulation with AD834

    Hello, Is it possible to setup the AD834 for frequency modulation? If so, could someone post an application circuit? Thank you.
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