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Chaining node components and bom
pekkanikander edited this page Jan 3, 2013
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A chaining node is a pass-through PoE switch that has an ARM micro controller to face similar I/O than the PET node. The plan is to have two models, one with one output port, the other with four output ports. The essential new components compared to the PET node are the Ethernet switch and the PoE DCE controller.
Ethernet Ethernet
Input PoE port ====+--------------------- Ethernet switch----------------+==== Output PoE port
| | | |
| | | RMII,SMI |
| | | |
| -48V 3.3V +----MCU | -48V
| | | i2c |
| | | |
+---- PoE PD controller DC/DC--PoE DCE controller |
| | | | |
| V | V |
+--------- FET-------------+----------FET-------------+
- Micrel KSZ8863RLL, $5.4@1, $3.4@100
- Micrel KSZ8895RQ, $7.4@1, $5.5@100
- IC Plus Corp IP175A, $1@1 + shipping @AliExpress
- ADM6996LC (expensive)
- TI TPS23851DCE, $13@1, $6.7@100
- Linear TC4266C, $7@1, $6.1@100