SL3ICS3001 datasheet(21/54 Pages) NXP

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SL3ICS3001_072831

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Product data sheet

COMPANY PUBLIC

Rev. 3.1 — 9 July 2012

072831

21 of 54

NXP Semiconductors

SL3ICS3001

UCODE HSL

9.3 Bit Coding

9.3.1 Forward Link

Maximum RF field is a NRZ ‘1’ (“A” in Figure 6), modulated RF field level equals NRZ ‘0’

(“B” in Figure 6).

9.3.2 Return Link

NRZ ‘0’ is no modulation, that means a high chip input impedance.

NRZ ‘1’ is a modulation (modulation transistor turned on), that means a very low chip input

impedance.

Within the FM0 encoded data patterns, a logical ‘0’ is transmitted, if there is transition at

the midbit. A logical ‘1’ is transmitted if no transition occurs at the midbit. Note: in FM0

encoding a transition occurs additionally at all bit boundaries.

9.4 Response Time

The tag immediately starts sending back the return sequence after a correct command

was received. As this sequence starts with a QUIET field (see Section 8.6.2) the

interrogator may use the time for that field for settling its receiver section.

9.5 Regeneration Time

After a response of the tag or the end of a WAIT field, the tag is immediately able to

receive a new command sequence from the interrogator. This sequence will again start

with a PREAMBLE DETECT field.

Therefore a Manchester’0’ is “01” in NRZ.

Fig 9.

Definition of a Manchester ‘0’

Therefore a Manchester’0’ is “01” in NRZ.

Fig 10. Definition of a Manchester ‘1’.

field modulated

field not modulated

field modulated

field not modulated

Table 20.

Maximum interrogator settling time

QUIET field length

 T

return bit rate - 0.75 Tforward bit rate

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