XO1.75 A3 B1 Changes: Difference between revisions
Jump to navigation
Jump to search
| Line 23: | Line 23: | ||
=A3 Layout Fixes= |
=A3 Layout Fixes= |
||
==Moving the RTC Battery== |
|||
The RTC battery should be moved to a location where the battery isn't under the heat spreader and where it can be easily attached to the motherboard. It doesn't have to be close to the battery charger. |
|||
==EC Connector and the Heat Spreader== |
|||
The EC connector is under the proposed heat spreader. This is generally agreed to be OK. |
|||
=Planned Feature Changes= |
=Planned Feature Changes= |
||
Revision as of 03:20, 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.
A3 Layout Fixes
Moving the RTC Battery
The RTC battery should be moved to a location where the battery isn't under the heat spreader and where it can be easily attached to the motherboard. It doesn't have to be close to the battery charger.
EC Connector and the Heat Spreader
The EC connector is under the proposed heat spreader. This is generally agreed to be OK.