MFRC522 datasheet(75/96 Pages) NXP

75 / 96 page

MFRC522_33

Product data sheet

PUBLIC

Rev. 3 — 26 October 2009

112133

75 of 96

NXP Semiconductors

MFRC522

Contactless reader IC

[3]

IDD(PVDD) depends on the overall load at the digital pins.

[4]

IDD(TVDD) depends on VDD(TVDD) and the external circuit connected to pins TX1 and TX2.

[5]

During typical circuit operation, the overall current is below 100 mA.

[6]

Typical value using a complementary driver conﬁguration and an antenna matched to 40

Ω between pins TX1 and TX2 at 13.56 MHz.

[7]

IDD(SVDD) depends on the load at pin MFOUT.

14.1 Timing characteristics

Fig 24. Pin RX input voltage range

001aak012

VMID

0 V

−1 V

VDDA + 1 V

Vmod

Vi(p-p)(max)

Vi(p-p)(min)

13.56 MHz

carrier

Table 154. SPI timing characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

tWL

pulse width LOW

line SCK

tWH

pulse width HIGH

line SCK

th(SCKH-D)

SCK HIGH to data input

hold time

SCK to changing

MOSI

tsu(D-SCKH)

data input to SCK HIGH

set-up time

changing MOSI to

SCK

th(SCKL-Q)

SCK LOW to data output

hold time

SCK to changing

MISO

--25

t(SCKL-NSSH) SCK LOW to NSS HIGH

time

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