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TRF7970A
SLOS743K – AUGUST 2011 – REVISED APRIL 2014
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6.14.3.2.5 TX Pulse Length Control Register (0x06)
The length of the modulation pulse is defined by the protocol selected in the ISO Control register 0x01.
With a high Q antenna, the modulation pulse is typically prolonged, and the tag detects a longer pulse
than intended. For such cases, the modulation pulse length can be corrected by using the TX Pulse
Length Control register (0x06). If the register contains all zeros, then the pulse length is governed by the
protocol selection. If the register contains a value other than 0x00, the pulse length is equal to the value of
the register in 73.7-ns increments. This means the range of adjustment can be 73.7 ns to 18.8 μs.
Table 6-33. TX Pulse Length Control Register (0x06)
Function: Controls the length of TX pulse
Default: 0x00 at POR = H or EN = L and at each write to ISO Control register.
Bit
B7
B6
B5
B4
B3
B2
B1
Name
Pul_p2
Pul_p1
Pul_p0
Pul_c4
Pul_c3
Pul_c2
Pul_c1
Function
Pulse length MSB
Description
The pulse range is 73.7 ns to 18.8 μs (1….255), step size 73.7 ns.
All bits low (00): pulse length control is disabled.
The following default timings are preset by the ISO Control register (0x01):
9.44 μs → ISO15693 (TI Tag-It HF-I)
11 μs → Reserved
2.36 μs → ISO14443A at 106 kbps
1.4 μs → ISO14443A at 212 kbps
B0
Pul_c0
Pulse length LSB
737 ns → ISO14443A at 424 kbps
442 ns → ISO14443A at 848 kbps; pulse length control disabled
6.14.3.2.6 RX No Response Wait Time Register (0x07)
The RX No Response timer is controlled by the RX NO Response Wait Time Register 0x07. This timer
measures the time from the start of slot in the anticollision sequence until the start of tag response. If there
is no tag response in the defined time, an interrupt request is sent and a flag is set in IRQ status control
register 0x0C. This enables the external controller to be relieved of the task of detecting empty slots. The
wait time is stored in the register in increments of 37.76 μs. This register is also preset, automatically, for
every new protocol selection. Sending a Reset FIFO (0x0F) direct command after a TX Complete interrupt
will disable this feature.
Table 6-34. RX No Response Wait Time Register (0x07)
Function: Defines the time when "no response" interrupt is sent; only for ISO15693
Default: 0x0E at POR = H or EN = L and at each write to ISO Control register
Bit
B7
B6
B5
B4
B3
B2
B1
B0
Name
NoResp7
NoResp6
NoResp5
NoResp4
NoResp3
NoResp2
NoResp1
NoResp0
Function
No response MSB
No response LSB
Description
Defines the time when "no response" interrupt is sent. It starts from the end of
TX EOF. RX no response wait range is 37.76 μs to 9628 μs (1 to 255), step
size is: 37.76 μs.
The following default timings are preset by the ISO Control register (0x01):
390 μs → Reserved
529 μs → for all protocols supported, but not listed here
604 μs → Reserved
755 μs → ISO15693 high data rate (TI Tag-It HF-I)
1812 μs → ISO15693 low data rate (TI Tag-It HF-I)
60
Detailed Description
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