AS3911B Datasheet, PDF (144/155 Pages) ams AG – NFC Initiator / HF Reader IC

Figure 128:
Example of BPSK Stream Mode for scf = 01b and scp = 01b
Data in FIFO
0
0
1
Input signal
8/fc
16/fc
Application Information
0
Reader to Tag Communication in Stream Mode:
Reader to tag communication control is the same for both
stream modes. Reader to tag coding is defined by data put in
FIFO. The stx bits of Stream Mode Definition Register define the
Tx time period during which one bit of FIFO data define the
status of transmitter. In case the data bit is set to logic 0 there
is no modulation, in case it is logic 1 the transmitted carrier
signal is modulated according to current modulation type
setting (AM or OOK). Transmission in stream mode is started by
sending direct commands Transmit Without CRC or Transmit
With CRC.
Figure below depicts an example for setting stx = 000b. With
this setting the Tx time period is defined to 128/fc (~9,44 μs).
Figure 129:
Example of Tx in Stream Mode for stx = 000b and OOK Modulation
Data in FIFO
0
0
1
0
Output signal
128/fc
AS3911B – 144
ams Datasheet: 2014-Jun-12 [v1-08]