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Help with schematic capture portion of CR95HF design...

Question asked by fortner.michael on Jul 10, 2013
Latest reply on Jul 15, 2013 by ST NFC


I am working with a local customer on a new CR95HF design and was hoping your team could provide feedback on some of the questions they submitted today related to schematic capture:

1. The RF output of CR95HF (TX1, TX2) is first connected to an EMC filter (L1, L3, C1, C4), do you have recommended component values for this EMC filter? (Note that their product will be first launched in US.)
2. Within the CR95HF demo board schematic (please see attached), it is not clear to them how the two resistors (circled in picture) are mounted. Could you provide some guidance here?
3. We noticed that CR95HF supports two VPS_TX range: 2.7V – 3.3V, 4.5V – 5.5V. What, if any are the performance tradeoffs between these two operating conditions? For example, if they drive a higher VPS_TX, will the NFC range be larger compared to a lower VPS_TX?

Thanks in advance for your help.