XO1.75 A3 B1 Changes: Difference between revisions
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=A3 Electrical Fixes= |
=A3 Electrical Fixes= |
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==SMBus Pullups== |
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These correct a mistake omitting the pullup resistors for the SMBus between the EC and the battery charger. |
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* Add a 1.3K resistor between PR200 and +3.3VSUS. |
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* Add a 1.3K resistor between PR201 and +3.3VSUS. |
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==External SD Power== |
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Ensure that the EN_SD2_PWR# signal is wired to all components in the layout. |
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==Input Protection== |
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Change to the input protection suggested by S.F. Chen, reducing the number of components. |
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==Vcore Improvements== |
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A solution to [http://dev.laptop.org/ticket/10901 Trac ticket #10901] should be implemented. |
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=A3 Layout Fixes= |
=A3 Layout Fixes= |
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Revision as of 03:16, 5 June 2011
These are the changes planned for the XO-1.75 B1 prototype, from the A3 prototypes.
A3 Electrical Fixes
SMBus Pullups
These correct a mistake omitting the pullup resistors for the SMBus between the EC and the battery charger.
- Add a 1.3K resistor between PR200 and +3.3VSUS.
- Add a 1.3K resistor between PR201 and +3.3VSUS.
External SD Power
Ensure that the EN_SD2_PWR# signal is wired to all components in the layout.
Input Protection
Change to the input protection suggested by S.F. Chen, reducing the number of components.
Vcore Improvements
A solution to Trac ticket #10901 should be implemented.