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Copy pathPreliminary BOM
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Preliminary BOM
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Preliminary Edison Block BOM
All Resistor tolerances are 1% unless otherwise specified
By Use
ICs
• U1 – MIC2026 High-side MOSFET switches Overcurrent Protection IC for Downstream USB
• U2 – LAN9512
• U3 – 93LC66A/SN Optional EEPROM Pi uses NO EEPROM
Crystal Components
• 25MHz Crystal
• 2x 33pF 50V 5% Capacitors
• 1 MΩ Resistor
LAN9512 Power Supply Filtering
• 15x 0.1uF Capacitors
• 1x 1.0uF Capacitor
• 1x 4.7uF Capacitor
• 2x 2.0 Amp/0.05 DCR Inductors/Ferrite Beads Murata BLM18PG121A/BLM18AG601
Downstream USB Power Switching
• 1x 1.0uF
• 2x LEDs Power Indicators (Optional)
• 2x 330Ω/511Ω LED Resistors (Optional)
• 3x 0.1uF
• 1x 47uF
• 1x 140mA/60V Polyfuses Overcurrent/Overvoltage Protection
• 1x Diodes Reverse-current protection
• **USB Power Supplies are ganged together in this case, requiring fewer parts but not allowing separate port power control.
Downstream USB Hardware
• 2x 150uF Tantalum Capacitors Used on SMSC Board
• 2x Shielded USB Connector Of whatever form factor works –technically, they should be USB-A
Upstream USB Hardware
• **Upstream USB will be connected directly to the Edison’s Hirose connector. Edison’s bus is powered, which might infer that our block be bus-powered and connected directly to the Edison’s power source. However, I am not quite sure how to connect this yet. It will need a jumper/toggle to switch between programming mode (disconnecting the LAN board’s USB connection entirely) and use mode (connected to the LAN board). No real hardware will be necessary (no USB connector, etc) besides some filtering but I need to sketch and think on this a little bit more, and review some more schematics.
Optional EEPROM
• 10kΩ Resistor
• 0.1 uF Capacitor Filtering
Ethernet
• 4x 49.9Ω Resistor Ethernet Tx/Rx pair Line Termination Resistors
• 4x 15pF Capacitor EMI Reduction
• 1x 10Ω Resistor
• 1x 22nF Capacitor
• 1x RJ45 Jack w/Integrated Magnetics and 2kV surge capacitor Consider a jack without integrated LEDs
• 3x LED
• 3x 330Ω/332Ω Resistor
Other Components
• 2x 10kΩ Resistor Ties Reset high, could be tied to an Edison GPIO pin or a button with a pullup resistor to enable resetting the chip on command. Second resistor enables Auto-MDIX by tying it high.
• 2x 12.4kΩ Resistor Biases USB and Ethernet references
• 1x Male 70-Pin Hirose connector (Header – Passthrough to other boards) Hirose #DF40C-70DP-0.4V(51)
• 1x Female 70–Pin Hirose receptacle DF40C(X.X)-70DS-0.4V(51) – “X.X” Refers to the stack height (ex. 3.0 means 3.0mm height)
By Type
Resistors
• 1x 1MΩ
• 2x 12.4kΩ
• 3x 10kΩ
• 5x 330Ω
• 4x 49.9Ω
• 1x 10Ω
Capacitors
• 2x 150uF
• 1x 47uF
• 1x 4.7uF
• 2x 1uF
• 16x/19x 0.1uF Depending on which method used to power the downstream USB ports, if included at all.
• 1x 22nF
• 2x 33pF
• 4x 15pF
Other
• 1x LAN9512
• 1x MIC2026
• 1x93LC66A
• 1x 25MHz Crystal
• 2x Shielded USB-A Connector
• 1x RJ45 Jack w/Integrated Magnetics
• 1x Diode
• 1x Polyfuse
• 2x 2.0 Amp/0.05 DCR Inductors/Ferrite Beads
• 1x Male Hirose Connector
• 1x Female Hirose Connector