divakar.raj
Newbie level 2
Hello,
I am using ADF7020 (daughter board with 11.0592MHz XTAL) to design a RF UHF reader which reads the data in the RFID tag (passive), as the tag comes within the range. I use dsPIC33fj256gp710 for interfacing with ADF7020. I will have to show the Tag data onto a computer hyperterminal (UART), as the tag comes within the range.
I understand the ADF7020 register values has to be communicated from dsPIC to ADF7020 serially, using the waveform reference shown in the ADF7020 website (pg 8). After latching all these register values into ADF7020 through SLE pin, the readback code is read from the SREAD pin of ADF7020 by setting SLE high and by initiating the clock pulses from dsPIC (as dsPIC is master). Once this is done i understand that the ADF transceiver is initiated and is ready to read the data from the tag. If what I understood above is wrong, please correct me. I am going to try the same through my code on dsPIC.
Besides, what I do not understand is, how to read the tag data from the ADF7020 IC (if a tag comes within the range), I also have seen the waveform shown for RxDATA and RXCLK at ADF7020 datasheet (pg 9). I presume, the DATA_CLK and DATA_I/O pins of ADF7020 should be connected to appropriate I/O pins of dsPIC. But, what I do not understand is, should I code the dsPIC so that the RxCLK pin continue to oscillate forever (after ADF IC is initiated), and whenever the tag comes within the range, will the ADF IC automatically emits the Tag data serially as per the clock pulses ? Or, will the ADF7020 IC by itself initiate the clock pulses also and transfer the data according to the clock pulses, if any tag comes within the range ? Or, how exactly the dsPIC reads data from ADF7020 IC ?
Can someone help ?
I dunno if i shud post it at RF or DSP or Microcontroller discussion community ? If I have made a posting at the wrong discussion community, the moderators shall direct me please. Thanks
Divakar Raj. R
I am using ADF7020 (daughter board with 11.0592MHz XTAL) to design a RF UHF reader which reads the data in the RFID tag (passive), as the tag comes within the range. I use dsPIC33fj256gp710 for interfacing with ADF7020. I will have to show the Tag data onto a computer hyperterminal (UART), as the tag comes within the range.
I understand the ADF7020 register values has to be communicated from dsPIC to ADF7020 serially, using the waveform reference shown in the ADF7020 website (pg 8). After latching all these register values into ADF7020 through SLE pin, the readback code is read from the SREAD pin of ADF7020 by setting SLE high and by initiating the clock pulses from dsPIC (as dsPIC is master). Once this is done i understand that the ADF transceiver is initiated and is ready to read the data from the tag. If what I understood above is wrong, please correct me. I am going to try the same through my code on dsPIC.
Besides, what I do not understand is, how to read the tag data from the ADF7020 IC (if a tag comes within the range), I also have seen the waveform shown for RxDATA and RXCLK at ADF7020 datasheet (pg 9). I presume, the DATA_CLK and DATA_I/O pins of ADF7020 should be connected to appropriate I/O pins of dsPIC. But, what I do not understand is, should I code the dsPIC so that the RxCLK pin continue to oscillate forever (after ADF IC is initiated), and whenever the tag comes within the range, will the ADF IC automatically emits the Tag data serially as per the clock pulses ? Or, will the ADF7020 IC by itself initiate the clock pulses also and transfer the data according to the clock pulses, if any tag comes within the range ? Or, how exactly the dsPIC reads data from ADF7020 IC ?
Can someone help ?
I dunno if i shud post it at RF or DSP or Microcontroller discussion community ? If I have made a posting at the wrong discussion community, the moderators shall direct me please. Thanks
Divakar Raj. R
