AN3433 datasheet(30/34 Pages) STMICROELECTRONICS

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Example of CR95HF tag detection calibration process

AN3433

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Doc ID 019046 Rev 2

REM, Search DacDataref value corresponding to value of DacDataH for

which Wake-up event switches from Tag Detect (0x02) to Timeout

(0x01)

REM, Step 0: force wake-up event to Tag Detect (set DacDataH = 0x00)

REM, With these conditions Wake-Up event must be Tag Detect

>>> CR95HFDLL_STCMD, 01 070E03A100F801180020606000003F01

<<< 00 01 02

REM, Read Wake-up event

= Tag Detect

(0x02); if not, error .

REM, Step 1: force Wake-up event to Timeout (set DacDataH = 0xFC

REM, With these conditions, Wake-Up event must be Timeout

>>> CR95HFDLL_STCMD, 01 070E03A100F801180020606000FC3F01

<<< 00 01 01

REM, Read Wake-up event = Timeout (0x01); if not, error.

REM, Step 2: new DacDataH value = previous DacDataH +/-

0x80

REM, If previous Wake-up event was Timeout (0x01) we must decrease

DacDataH (-0x80)

>>> CR95HFDLL_STCMD, 01 070E03A100F8011800206060007C3F01

<<< 00 01 01

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

Detect (0x02)

REM, Step 3: new DacDataH value = previous DacDataH +/- 0x40

REM, If previous Wake-up event was Timeout (0x01), we must decrease

DacDataH (-0x40); else, we increase DacDataH (+ 0x40)

>>> CR95HFDLL_STCMD, 01 070E03A100F8011800206060003C3F01

<<< 00 01 02

REM,

Read Wake-up event = Timeout (0x01)

Wake-up event

= Tag

Detect (0x02)

REM, Step 4: new DacDataH value = previous DacDataH +/- 0x20

REM, If previous Wake-up event was Timeout (0x01), we must decrease

DacDataH (-0x20); else, we increase DacDataH (+ 0x20)

>>> CR95HFDLL_STCMD, 01 070E03A100F8011800206060005C3F01

<<< 00 01 02

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