Texas Instruments TRF7970A Manual page 63

www.ti.com
6.15.3.2.7 RX Wait Time Register (0x08)
The RX-wait-time timer is controlled by the value in the RX wait time register 0x08. This timer defines the
time after the end of the transmit operation in which the receive decoders are not active (held in reset
state). This prevents incorrect detections resulting from transients following the transmit operation. The
value of the RX wait time register defines this time in increments of 9.44 µs. This register is preset at
every write to ISO Control register 0x01 according to the minimum tag response time defined by each
standard.
Table 6-35 describes the RX Wait Time register.
Function: Defines the time after TX EOF when the RX input is disregarded for example, to block out electromagnetic disturbance
generated by the responding card.
Default: 0x1F at POR = H or EN = L and at each write toISO control register.
Bit Name
B7 Rxw7
B6 Rxw6
B5 Rxw5
B4 Rxw4
RX wait time
B3 Rxw3
B2 Rxw2
B1 Rxw1
B1 Rxw0
Copyright © 2011–2017, Texas Instruments Incorporated
Table 6-35. RX Wait Time Register (0x08)
Function
Defines the time after the TX EOF during which the RX input is ignored. Time
starts from the end of TX EOF.
RX wait range is 9.44 µs to 2407 µs (1 to 255), Step size 9.44 µs.
The following default timings are preset by the ISO Control register (0x01):
9.44 µs → FeliCa
66 µs → ISO/IEC 14443 A and B
180 µs → Reserved
293 µs → ISO/IEC 15693 (TI Tag-It HF-I)
Submit Documentation Feedback
Product Folder Links:
SLOS743L – AUGUST 2011 – REVISED MARCH 2017
Description
TRF7970A
TRF7970A
Detailed Description 63