Page 2 of 2 FirstFirst 12
Results 11 to 12 of 12

Thread: VPW 4X high speed

  1. #11
    VENDOR - ScanTool Vitaliy's Avatar
    Join Date
    Dec 2006
    Location
    Phoenix, AZ
    Posts
    624
    Quote Originally Posted by beyerch View Post
    According to the PDF writeup, they are using the MC 33390 as their VPW transceiver. While this transceiver supports 41.6Kbps send and received, it only supports block mode in receive mode. While you could flash a PCM while not in 'block mode', its going to take pretty darn long. They will need to use a MC68HC58 as their transceiver. (for example).

    This part is out of production I believe; therefore, at some point quantities will run out.
    The MC33390 is a dumb signal level shifter: it changes 5V logic into 7V and vice versa. What makes you say that "it only supports block mode in receive mode"?

    Vitaliy
    OBDLink MX: world's smallest, fastest, most advanced OBD/Bluetooth adapter with SW and MS CAN support. Read the review to learn more.
    — Need to look up a diagnostic trouble code? Try the most up-to-date, free DTCsearch.com!

    You cannot send me a private message using this forum. Use my email instead: vitaliy[@]scantool.net.

  2. #12
    Newbie
    Join Date
    Aug 2010
    Posts
    2
    Quote Originally Posted by Vitaliy View Post
    The MC33390 is a dumb signal level shifter: it changes 5V logic into 7V and vice versa. What makes you say that "it only supports block mode in receive mode"?

    Vitaliy
    Besides from waveshaping in 10.4k and not wave shaping in 4x mode, it basically is just a transceiver. What I meant to say was that most of the microcontrollers that you can get with VPW support built in generally allow for 4x read and write; however, most do not support block mode except for read.

    If that interface is using "built in" VPW support (i.e. HC12/HC11/HC08, etc), then they'd have to do a lot of work to get a 4x block transmit.

    When it comes to that, a lot of people prefer 68hc58's as it does a lot more than a 33390 can do. Unfortunately, they are out of production so unless you are doing low volumes, you probably don't want to use that in your design....

    Sorry for the confusion. I let my fingers go alot faster than my brain on these explanation......

Page 2 of 2 FirstFirst 12

Similar Threads

  1. Tip! Get speed cameras into Centrafuse/D3
    By Micke in forum Centrafuse
    Replies: 16
    Last Post: 07-07-2005, 05:33 PM
  2. speed camera in frodo?
    By Erwin in forum Map Monkey
    Replies: 0
    Last Post: 03-30-2005, 11:21 AM
  3. High Bright Sun Light Readable LCDs
    By PORTUGAL in forum LCD/Display
    Replies: 18
    Last Post: 06-23-2004, 11:19 AM
  4. problem with my usb to ide cable. high speed usb drive?
    By DSM97RS in forum General Hardware Discussion
    Replies: 14
    Last Post: 05-19-2004, 12:10 AM
  5. high speed mobile/satilite internet
    By pete35887 in forum Wireless Communications
    Replies: 3
    Last Post: 04-10-2004, 12:12 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •