User's Manual

TRF7970A
SLOS743K –AUGUST 2011–REVISED APRIL 2014 www.ti.com
Figure 6-21. Continuous Read of Registers 0x00 Through 0x05 Using SPI With SS
Performing Single Slot Inventory Command as an example is shown in Figure 6-22. Reader registers (in
this example) are configured for 5 VDC in and default operation.
Figure 6-22. Inventory Command Sent From MCU to TRF7970A
The TRF7970A takes these bytes from the MCU and then send out Request Flags, Inventory Command
,and Mask over the air to the ISO15693 transponder. After these three bytes have been transmitted, an
interrupt occurs to indicate back to the reader that the transmission has been completed. In the example in
Figure 6-23, this IRQ occurs approximately 1.6 ms after the SS line goes high after the Inventory
command is sent out.
40 Detailed Description Copyright © 2011–2014, Texas Instruments Incorporated
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