On Fri, 27 Jan 2012, Viesturs L?cis wrote:
Date: Fri, 27 Jan 2012 10:10:02 +0200
From: "[UTF-8] Viesturs L?cis" <viesturs.la...@gmail.com>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
Subject: Re: [Emc-users] Mesa 5i23 & 7i39 - possible damage?
Hello again!
I checked 7i39 manual 2 more times, did not find any warning that
would tell not to pull up to 5V, so I turned PC off and set all the
5i23 connectors to pull up to 5V.
What I am seeing now makes me think that there is something wrong:
In HAL file I have:
setp hm2_[HOSTMOT2](BOARD).0.gpio.040.is_output 1
setp hm2_[HOSTMOT2](BOARD).0.gpio.040.invert_output 1
When output is "false":
There are 3,46V between 5i23 pin and GND.
There are 1,68V between 5i23 pin and +5V.
When output is "true":
There are 0.6V between 5i23 pin and GND.
There are 4.65V between 5i23 pin and +5V.
I measured: it actually has 5,4V between +5V and GND.
I think that voltages, when output is "true" are ok, but I think that
there is something wrong with the "false" state.
Am I missing something here?
Viesturs
This is expected. The FPGA outputs only swing to 3.3V when driven by the FPGA,
You can get 5V output swing, but only if you set the FPGA outputs you wish to
have 5V swing to open drain mode and you have the connector (W1,W4,W7) set to
5V (UP) and pullup power (W2,W5,W8) set to 5V (UP) and bus switch mode
(W3,W6,W9) set to 5V (UP)
Note that in open drain mode the the output can sink significant current
(pull the output down) but can only source what the pullup resistor supplies
(~1.6 mA from 3.3K pullup returned to 5V with output grounded)
2012/1/27 Viesturs L??cis <viesturs.la...@gmail.com>:
Hello!
In my attempts to understand, why I cannot get my diy output driver
for switching the laser power on/off, I discovered that 5i23's gpio
pins aru pulled up to only 3,3V, not 5V, when turned off, so there is
1,7 V still remaining supplied to optoisolator.
There are jumpers on 5i23 that determine, if pins are pulled up to 3,3 or 5V.
I have 7i39 card attached to the same connector. Is there a chance for
possible damage for 7i39, if I will set that connector to pull up all
pins to 5V instead of 3,3V?
Viesturs
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Mesa Electronics
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