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Type: Posts; User: joniengr

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  1. Replies
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    374

    Closed: Re: Enabling PLL in PIC18F

    PLL only multiples by 24 or 4 ? How about getting 40 MHz using PLL from internal 8 HMz ?
  2. Replies
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    374

    Closed: Enabling PLL in PIC18F

    Hi,

    I am having 16 MHz X-Tal crystal and I would like to get 40 MHz FOSC for higher baud rate. I guess PLL in PIC18F2550 can generate 4 times the crystal frequency but then it will be 64 MHz...
  3. Closed: Re: "RS-232 port to transfer data to PC for analysis"

    I understand that MCP2221 is just a UART character transfer device which bridge or map UART to USB. The CRC is a part of protocol and can be implemented on transmitter and receiver, and the CRC has...
  4. Closed: Re: Baud rate limitation in PIC Microcontoller

    This means that the nearest baud rate to 115200 with 16 MHz crystal in PIC16F876 is 16,000,000/(16*(1+7)) = 125,000, right ? where SPBRG register has to be written with 7.

    This can also be...
  5. Closed: Re: Baud rate limitation in PIC Microcontoller

    I don't find 14.74 MHz and 921 kBaud in the chapter 10.1 of datasheet 16F876.

    I was using internal oscillator which limit me to 57600 baud rate.

    With 16 MHz X-TAL crystal it is possible to...
  6. Closed: Re: "RS-232 port to transfer data to PC for analysis"

    Cyclic Redundancy Check
  7. Closed: Baud rate limitation in PIC Microcontoller

    Hi,

    I have tested PIC 16F876 with 57600 which works fine. However it fails at 115200. Is this a limit ? Is it possible to use 16F876 with 115200 ?
  8. Closed: Re: "RS-232 port to transfer data to PC for analysis"

    Another question related to UART and RS-232. If I use MCP 2221 which is UART to USB bridge with Microcontroller. Then I need to connect Tx, Rx of the Microcontroller to MCP with common ground. Is it...
  9. Closed: Re: "RS-232 port to transfer data to PC for analysis"

    Two more questions regarding RS-232 port and UART protocol.

    1- VM111 PIC Programmer by Velleman uses RS-232 port to connect programming cable to PC. Is is possible to use UART to USB FTDI bridge...
  10. Closed: Re: "RS-232 port to transfer data to PC for analysis"

    It is Extech EA15 Dual Input Temperature Datalogger.

    Is it possible or allowed to use RS-232 port with a communication protocol other than UART or it has to be always UART ?

    VM111 PIC...
  11. Closed: "RS-232 port to transfer data to PC for analysis"

    Hi,

    I am looking for thermocouples with readers. I just found one with software support. There is a statement in the user manual / datasheet. I am trying to understand this statement.
    ...
  12. Closed: Re: Maximum current when power taken from USB cable

    In case of bus power (devices on the development board power up from the +5V Vbus of the USB cable) how much maximum current the USB bus power can provide. I guess 500 mA. is that right ?

    Because...
  13. Closed: Re: Maximum current when power taken from USB cable

    If I connect some devices on the development board directly to +5V from the USB cable without any device descriptor then how much maximum current can be withdrawn from the USB cable ?
  14. Closed: Maximum current when power taken from USB cable

    Hi,

    I have devices which include Microcontroller and FDTI chip on the development board. I am going to power them up from +5V and GND available in the USB 2.0 cable, I guess this configuration is...
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    Closed: Re: PCB design 450 MHz LVDS trace routing

    Hi, Thanks for suggestion. Kindly send me in good quality. I am not able to read small numbers.
  16. Replies
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    Closed: PCB design 450 MHz LVDS trace routing

    Hi,

    I am going to design with 8 layers having LVDS 450 MHz traces. I am just wondering about the Stack-up scheme. How about the following arrangement of layers.

    Layer 1 : Routing
    Layer 2 :...
  17. Replies
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    Closed: Re: ADC output bit rate and PCB layout

    "Series 7 is specified for 950 MBPS DDR LVDS speed, 910 MBPS has little margin. It's suggested to use digital phase alignment to adjust the receiver timing."

    I guess the effective DCO will be 455...
  18. Replies
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    617

    Closed: Re: ADC output bit rate and PCB layout

    Hi,

    I guess it is ok to sample the ADC data at both positive and negative edges in FPGA, right ? Do the FPGA or ZYNQ have LVDS I/O to take the data in at 455 MHz ? How about the layout...
  19. Replies
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    Closed: ADC output bit rate and PCB layout

    Hi,

    I am considering AD9257 ADC for my application. The ADC chip is octal which means 8 ADC on chip. The resolution is 14 bits and sampling rate is 65 MSPS. Each channel has serial LVDS output....
  20. Replies
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    Closed: Re: Understanding the USB Protocol

    Hi,

    I guess UART-USB bridge is USB CDC class which is limited by the data rate close to Low Speed 1.5 Mbps. Is this limitation of UART or limitation of USB CDC ? Is it possible to achieve Full...
  21. Replies
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    Closed: Understanding the USB Protocol

    Hi,

    I am trying to understand the connection between the two USB classes CDC and HID and four types of following data transfers.

    Control Transfer
    Isochronous Transfer
    Interrupt Transfer...
  22. Replies
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    Closed: Re: Data acquisition using PIC starter kit

    Actually I have PIC18F2550 in house and PIC programmer. For learning purpose I would like to start working with that. The aim is to get throughput of 50 kilo sample per second with a string of 10...
  23. Replies
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    Closed: Re: Data acquisition using PIC starter kit

    Thanks for your reply. I guess I would go with 50 kilo sample per second at the first stage and consider USB Full Speed for communication.

    - Sampling rate: 50 kilo samples per second
    - String:...
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    Closed: Re: Sampling Jitter of 1 ns

    Actually I need to sample a pulse from accelerator meter which is around 1 to 5 ns. I need to sample the peak value. I am looking for peak hold device which can hold the peak value for few micro...
  25. Replies
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    Closed: Sampling Jitter of 1 ns

    Hi,

    I would like to capture a jitter of 1 ns. I am looking for sample and hold IC which can hold the peak up to 1 micro second or more. Is there any recommendations on this ?
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