AN3433 datasheet(31/34 Pages) STMICROELECTRONICS

31 / 34 page

AN3433

Example of CR95HF tag detection calibration process

Doc ID 019046 Rev 2

31/34

REM, Read Wake-up event = Timeout (0x01)

Wake-up event = Tag

Detect (0x02)

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, 01 070E03A100F8011800206060006C3F01

<<< 00 01 02

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, 01 070E03A100F801180020606000743F01

<<< 00 01 01

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, 0 1070E03A100F801180020606000703F01

<<< 00 01 01

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, 01 070E0B21007901180020606064743F01

<<< 00 01 01

AN3433 Fiches technique(PDF) 31 Page - STMicroelectronics