ADVANCED VEHICLE TECHNOLOGIES, Inc.
AVT-715 Hardware Revision Descriptions
Updated: 8 March, 2002
Revision A
General release: 18 May, 1996

Revision un-named
General release: 17 July, 1997
(Developed for a customer.)
Added a 10 K ohm pull-up resistor to the RS-232 ‘carrier detect’ signal line (CD). Pulls up to the isolated Vcc (+5v).
Modification implemented by adding a resistor to the bottom of the board.

Boards affected, serial numbers (as of 17 July, 1997):
471
472
473
474
475
476
477
478
479

Revision B
General release: 17 October, 1997
(Developed to satisfy Chrysler program requirements.) Made changes to the VPW bus interface circuitry around the HIP7020AB device. Modification implemented by changing components, adding other components to bottom of board, and cutting trace on board.

Changed:
R22 from 10 K ohm to 11 K ohm.
R20 from 61.9 K ohm to 56.0 K ohm.

Added:
C25 470 pF ceramic cap across R22.
C24 100 pF ceramic cap across R20
R30 10 ohm resistor at the BUS OUT pin of the HIP7020AB device.

Revision C
General release: February, 1998
Added Chrysler CCD function to the AVT-715. CCD function implemented on a small board installed above main board. Several jumper wires added to bottom of main board. 15 pin ribbon cable moved from main board to CCD board. 15 pin ribbon jumper cable added between CCD board and main board.

Revision D
General release: November, 1998
Re-designed the board to improve manufacturability and to incorporate all previous revisions. For this revision the DC/DC power supply was removed and a linear voltage regulator was installed. The heat dissipation was discovered to be more than originally anticipated. Extra heat sinks had to be added to the voltage regulator. A future revision is planned to remove the linear regulator and go back to the DC/DC converter used in earlier revisions (it worked very well and had a good field history).

Revision E
General release: January, 1999
Re-designed the board.  Replaced linear power supply with DC/DC converter.  Added jumper block to support CCD add-on board.  May have corrected other outstanding changes.


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