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  5. 7i96 - P1 CONNECTOR - 15 mA for sink - it is not good

7i96 - P1 CONNECTOR - 15 mA for sink - it is not good

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20 Sep 2022 19:17 #252434 by zz912
Replied by zz912 on topic 7i96 - P1 CONNECTOR - 15 mA for sink - it is not good
OK

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20 Sep 2022 20:38 #252438 by PCW
Replied by PCW on topic 7i96 - P1 CONNECTOR - 15 mA for sink - it is not good
OK its R38

It looks like it was a deliberate change to allow better operation with G540 drives (that need more high drive on the charge pump signal = DB25 pin16 =GPIO50)

I will fix the documentation
The following user(s) said Thank You: tommylight, zz912

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21 Sep 2022 03:50 - 21 Sep 2022 03:52 #252459 by zz912
Replied by zz912 on topic 7i96 - P1 CONNECTOR - 15 mA for sink - it is not good
This is my R38. 
 
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Last edit: 21 Sep 2022 03:52 by zz912.

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21 Sep 2022 06:08 #252477 by zz912
Replied by zz912 on topic 7i96 - P1 CONNECTOR - 15 mA for sink - it is not good
I have an application where I use a 7I37TA card to protect P1. Will this resistor not bother her?

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21 Sep 2022 06:30 #252479 by zz912
Replied by zz912 on topic 7i96 - P1 CONNECTOR - 15 mA for sink - it is not good

OK its R38

It looks like it was a deliberate change to allow better operation with G540 drives (that need more high drive on the charge pump signal = DB25 pin16 =GPIO50)

I will fix the documentation
 

It si not DB25 pin16. It is lucky 13. :-)
 
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21 Sep 2022 15:44 - 21 Sep 2022 16:28 #252519 by PCW
Replied by PCW on topic 7i96 - P1 CONNECTOR - 15 mA for sink - it is not good
OK
It should not interfere with any Mesa daughter card but might cause issues
with some parallel port BOBs

I checked the BOM and its 300 Ohms there, not sure if it was done for a reason
or was just a mistake.
Last edit: 21 Sep 2022 16:28 by PCW.
The following user(s) said Thank You: tommylight

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