CR95HF Datasheet, PDF (49/63 Pages) STMicroelectronics – 13.56-MHz multi-protocol contactless transceiver IC with SPI and UART serial access

CR95HF
Example of tag detection calibration process
REM, Step 5: new DacDataH value = previous DacDataH +/- 0x10
REM, If previous Wake-up event was Timeout (0x01), we must decrease
DacdataH (-0x10); else, we increase DacDataH (+ 0x10)
>>> CR95HFDLL_STCMD, 01070E03A100F8011800206060006C3F01
<<< 000102
REM, Read Wake-up event = Timeout (0x01) or Wake-up event = Tag
Detect (0x02)
REM, Step 6: new DacDataH value = previous DacDataH +/- 0x08
REM, If previous Wake-up event was Timeout (0x01), we must decrease
DacDataH (-0x08); else, we increase DacDataH (+ 0x08)
>>> CR95HFDLL_STCMD, 01070E03A100F801180020606000743F01
<<< 000101
REM, Read Wake-up event = Timeout (0x01) or Wake-up event = Tag
Detect (0x02)
REM, Step 7: new DacDataH value = previous DacDataH +/- 0x04
REM, If previous Wake-up event was Timeout (0x01), we must decrease
DacDataH (-0x04); else, we increase DacDataH (+ 0x04)
>>> CR95HFDLL_STCMD, 01070E03A100F801180020606000703F01
<<< 000101
REM, Read Wake-up event = Timeout (0x01) or Wake-up event = Tag
Detect (0x02)
REM, If last Wake-up event = Tag Detect (0x02), search DacDataRef =
last DacDataH value
REM, If last Wake-up event = Timeout (0x01), search DacDataRef =
last DacDataH value -4
REM, For tag detection usage, we recommend setting DacDataL =
DacDataRef -8 and DacDataH = DacDataRef +8
>>> CR95HFDLL_STCMD, 01070E0B21007801180020606064743F01
<<< 000101
Doc ID 018669 Rev 8
49/63