ADVANCED VEHICLE TECHNOLOGIES, Inc.
AVT-716 Hardware Revision Descriptions
Updated: 21 May, 2001

Revision A
Board #1
General release: June, 1997 Board #2
General release: June, 1997
Revision B
Board #1
General release: September, 1997
Changes to board layout to correct several errors. Board #2
General release: September, 1997
Changes to board layout to add timer oscillator and correct errors.
Revision C
Board #1
General release: March, 1998
Add jumper wire to enable K-line input to TPU channel 0 (and 1) for baud rate detection.
Add jumper wire to connect TPU channel 2 (and 3) output to millisecond timer input.
Board #2
General release: March, 1998
Removed the 32 KHz oscillator circuit. This circuit proved to be unstable and unreliable. The 16 KHz clock source has been replaced by the output from TPU channel 2. The following components have been removed: Y1, C22, C23, R36, and JP2. R35 is now a 10 kohm 1% resistor connecting U5 pin 13 to ground.
Revision D
Board #1
General release: 20 March, 1998
Add 4-pin right angle pin header to P2 (on bottom of board), facing inward. Board #2
General release: 20 March, 1998
Add single 24 AWG wire with pin socket connector to P3-2 (on bottom of board).
Enclosure connector P1-9 is now the GM 8192 UART (or ALDL) signal connection.
UART Board (GM 8192 or ALDL)
Add physical layer interface board in the enclosure under the AVT-716 board set. UART interface board is connected to 716 board #1 via pin header to P2. UART interface board is connected to UART bus via connection to 716 board #2 P2 (enclosure connector P1).
Revision E
Board #1
General release: January 1999
New layout to board. Transitioned components to SMT, as much as possible.
Added circuitry necessary to support changes to board #2. Changes primarily consist of support for ALDL and CCD modes.
Board #2
General release: January 1999
New layout to board. Transitioned components to SMT, as much as possible.
Added circuitry to support additional modes of ALDL and CCD. Note that revision "E" hardware will not be compatible with previous revisions of hardware. In other words, do not mix and match AVT-716 boards.
Revision F
Board #1
General release: 1 May, 2000
Add a jumper between pins #7 and #8 of P4.
This modification enables the use of TIMER1 which is implemented in the TPU.
Refer to the engineering note for firmware version 5.1 for instructions on how to add this jumper and the use of TIMER1.
Board #2
General release: 1 May, 2000
No changes to this board.
Revision G (special, two units only)
Board #1
No changes to this board.
Board #2
General release: 5 January, 2001
Added a 040 PTC fuse between +5 volt supply and pin #16 of P3.
Installed a socket for U17.
Jumper1 board
General release: 5 January, 2001
Added 100 ohm 5% 1/4 watt series resistors in both CCD bus signal lines.
Added a relay in series with each CCD bus signal line.
Relays are powered from 716 +5 volt supply.

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