XO1.75 A3 B1 Changes

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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.

A3 Layout Fixes

Planned Feature Changes

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