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

zz912
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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

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PCW
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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

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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.

Last edit: 21 Sep 2022 03:52 by zz912.

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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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zz912
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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

PCW wrote:
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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PCW
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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.

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

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