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TRF7970A re-start up sequence

Guru 16800 points
Other Parts Discussed in Thread: TRF7970A

Hello sirs,

My customer considers the re-start up sequence of TRF7970A in case NFC is in the abnormal condition without any known cause.
The nominal start-up sequence is complied with the sequence described in Figure 6-3 on the TRF7970A's datasheet.
However, in case of the re-start up sequence, VIN keeps high and SS, EN2 and EN are low, and then SS, EN2 and EN are activated.
Regardless of power-down, VIN keeps high by the power in the super capacitor.

Is the above re-start up sequence considered as the appropriate start-up sequence?

Best Regards,

Nomoto