[hpsdr] [OZY] Schematic Update for 12 May 2006

[Alex]

Can the solder jumps on the OSY be sized to accept a zero ohm surface mount resistor?

----- Original Message ----
From: Philip Covington <p.covington at gmail.com>
To: HPSDR List <hpsdr at hpsdr.org>
Sent: Friday, May 12, 2006 3:29:18 PM
Subject: [hpsdr] [OZY] Schematic Update for 12 May 2006

***** High Performance Software Defined Radio Discussion List *****

Hi group,

Here's today's update to the OZY schematic:

<http://www.philcovington.com/HPSDR/OZY/REVXA.1/>

or

<http://www.hamsdr.com/personaldirectory.aspx?id=235>

or committed to HPSDR SVN.

Changes:

1. Configuration jumpers changed to through hole 1x3 headers.

2. EMC protection on USB changed to Littlefuse PGB002ST23WR.

3. Schottky diodes added in series with 3.3V supply on 2X10 Logic
Analyzer/Debug port header pin 1.

4. FX2 INT4 (active high) routed optionally to FPGA (selected by making jumper).

5. PCA9555 16 bit I2C IO expander added for local IO.  Interrupt line
from PCA9555 routed to FX2 INT5 (active low).  ULN2003A added to seven
bits of PCA9555A for high voltage open collector outputs.  There are
now 8 inputs/8 outputs of optional local IO on OZY.

What has not been added:

A. 1-Wire bus support... still researching options...

B. RS-232 connectors...depends on A above since if we use the DS2480B
we will steal one of the FX2's serial ports.  That will leave use with
one RS-232 serial port originating from the FX2 and one RS-232 serial
port originating from the FPGA.

73 de Phil N8VB
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