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Wakup Time for CLRC663 with RS232 / UART connection

Question asked by Christian Tasche on Jun 25, 2017
Latest reply on Jul 10, 2017 by Kan_Li

I'm using CLRC663 with RS232 / UART connection. I have configured the IC to 1228.8 kbit/s. The communikation is working fine.
Than i'm using the standby mode by setting the PowerDown bit in the command register.

To wake up the CLRC663 i send 55h and than try to read read adress 00h. It tooks now 450µs to get a response from the CLRC663.


To leave the standby mode the bit PowerDown in the register Command is cleared. This
will trigger the internal start-up sequence. The reader IC is in full operation mode again
when the internal start-up sequence is finalized (the typical duration is 15 us).

The datasheet says the typical duration is 15µs to start up. So is it normalt that the IC takes up to 450µs to respond?