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Problem with CR95HF´s Tag Detection Mode / Wake-Up by Tag Detect

Question asked by Armin Böss on Mar 29, 2018
Latest reply on Apr 3, 2018 by Armin Böss

Hi
I have the following problem with above mentioned function:

Every time i command  the CR95HF to get in the Tag Detection Mode it wakes up immediately. I get the following response from CR95HF:

00 01 02

The Command i give the CR95HF is the following:

 char DataOut[16] = {0x07, 0x0E, 0x02, 0x21, 0x00, 0x79, 0x01, 
                     0x18, 0x00, 0x20, 0x60, 0x60, 0x64, 0x74,
                     0x3F, 0x08};                        

                     //Byte structure                    Byte content   
(0x07);              //Command Idle   
(0x0E);              //Length   
(0x02);              //WU Source + LFO frequency   Source = Tag Detection   
(0x21);              //EnterCtrlL                  Tag Detection   
(0x00);              //EnterCtrlH                  Tag Detection   
(0x79);              //WUCtrlL                     Tag Detection   
(0x01);              //WUCtrlH                     Tag Detection   
(0x18);              //LeaveCtrlL                  Tag Detection / can´t differ from 0x1800   
(0x00);              //LeaveCtrlH                  Tag Detection / can´t differ from 0x1800   
(0x20);              //WU Period                   Time allowed between two Tag Detections   
(0x60);              //Osc Start                   Defines delay for HFO stabilization   
(0x60);              //DacStart                    Defines delay for DAC stabilization   
(0x64);              //DacDataL                    Define lower and higher DAC comparator values   
(0x74);              //DacDataH   
(0x3F);              //SwingsCnt                   Numer of HF swings allowed during Tag Detection   
(0x08);              //MaxSleep                    Maximum number of tag detection trials

 

I cant estimate where things go wrong, the Wake Up by low Pulse on IRQ IN works fine and, of course, there is no NFC Tag close to the CR95HF´s Antenna.

 

Best Regards,

Armin

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