SL3ICS3001FW datasheet(22/54 Pages) NXP

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SL3ICS3001_072831

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Product data sheet

COMPANY PUBLIC

Rev. 3.1 — 9 July 2012

072831

22 of 54

NXP Semiconductors

SL3ICS3001

UCODE HSL

9.6 Start-up Time

In general no special rise time is required. However, before starting data transmission to

the tag, the interrogator has to establish a permanent carrier. If one uses the begin of

ramp up of the field as starting time of a new command (as may desired after a frequency

hop, to shorten the communication time) the values defined in Figure 11 and Table 21

hold.

Note: Respecting above values, the power up process can be used for the

PREAMBLE_DETECT field. If the power interruption for the tag was in the range of

tNN <t  tSD, a TAG RESYNC has to be used before the next command (see Section 9.7).

9.7 Power interruptions

Power interruptions of different times will lead to the following consequences:

Fig 11. RF envelope - power up waveform

Table 21.

Timing limits

Symbol

Min

Typ

Max

Unit

030

s

400

s

100%

10%

90%

Table 22.

Tag reaction on power interruptions

Power interruption time: Tinterrupt

Consequences

FROM

0tNN

No notice of interruption by the tag

tNN

tSD

Start of demodulation by the tag due to the interrupt

may happen, if the tag is not reset due to power

shortage.

tSD

tDE_SB

Date exchange status bit stays valid, despite that the

digital state information is lost.

tDE_SB

Tag looses all internal state information and the data

exchange status bit is reset.

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