Part Number: DLP-7970ABP
Other Parts Discussed in Thread: TRF7970A
I was executing the inventory command on my (SL13A) ISO15693 tag and printing the UID of the tag and the IRQ status register of the reader using the DLP7970 reader which uses the TRF7970A reader IC with VCC supply voltage of 3 volts at PIN 1.
I was using PCA10056 NRF52840 microcontroller board and the Segger embedded studio IDE to program my reader,
The TRF7970A RFID transceiver supports two modes at 3V and 5V as mentioned in its datasheet. So I applied 5 V at VCC PIN 1 of DLP7970A and set the status control register to HEX 0X21 (for 5v mode) for which the inventory command on my tag was not working. Later I read in the DLP7970 datasheet that VCC needs be set to 3 volts. When I again set PIN 1 VCC to 3 volt mode and set the status control register to HEX 0X20 (for 3v mode) and run the Inventory command as working originally the UID and the IRQ status register started showing random values and even when I took the tag away from the reader it was still showing a changing UID and IRQ status register value without any RFID tag present near to scan.