Service Module Rev A ECOs (main board)

List:

• U15: ​ECO Link
• U23: ​ECO Link
• R94,R95,R96 Remove resistors.
• R50 should be 10k-ohms for CERN IPMC
• R52,R56,R61,R62 should be ~100-ohms
• Samtec headers for FP (J40, J46) are a bit too tall. Suggest sub SAM11085-ND (ESQ-106-23-L-D)

notes:

• 220uF caps should get smaller (physically, too tall)
• Remember to populate R50 with CERN IPMC value.
• We should add a pull-down to U15 pin 1 for when we have no IPMC (added on board 1)​ECO Link
• We should add a pull-up to ETH_SW_RESET_N (Has on-board pull-up, so we are OK)
• Traces under mounting splice plate holes
• U23 has wrong DigiKey? part number ​ECO Link
• A pull up/down should be added between U24 pin 4 and U23 pin 7

Front panel board changes for Rev B

• Remove level shifter and wire direct uSD card to connector
• Change FT232RQ to FT232RL (TSSOP package)
• Wire USB_UART_EN to FT_3V3 through R2 instead of from nDTR
• Change header P/N for headers for longer pins