PR533 datasheet(26/36 Pages) NXP

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PR533_SDS

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Product short data sheet

COMPANY PUBLIC

Rev. 3.6 — 27 October 2014

206436

26 of 36

NXP Semiconductors

PR533

USB NFC integrated reader solution

10.22 System reset timing

[1]

Dependent on the 27.12 MHz crystal oscillator startup time.

[2]

If the trst pulse is shorter than 20 ns, the device may be only partially reset.

Fig 6.

System reset overview

tw(rst)

trst

Vth(rst)reg + Vth(rst)reg(hys)

Vth(rst)reg(hys)

VDD(PVDD)

RSTPD_N

RSTOUT_N

tPOR

001aao394

Table 34.

Reset duration time

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

tPOR

power-on reset time

[1] 0.1

0.4

trst

reset time

hard power-down time; user dependent

[2] 20

tw(rst)

reset pulse width

reset time when RSTPD_N is released

[1] 0.1

0.4

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