MFRC522 datasheet(77/109 Pages) NXP

77 / 109 page

112132

Product data sheet

Rev. 3.2 — 22 May 2007

77 of 109

NXP Semiconductors

MFRC522

Contactless Reader IC

19.3 Testsignals at pin AUX

With the MFRC522, the user may select internal signals to measure them at pin AUX.

These measurements can be helpful during the design-in phase to optimise the design or

for test purpose.

Table 154 shows an overview of the signal that can be switched to pin AUX1 or AUX2 by

setting SelAux1 or SelAux2 in the register AnalogTestReg.

Please also refer to register AnalogSelAux.

Remark: The DAC has a current output. It is recommended to use a 1 k

Ω pull-down

resistance at pins AUX1/AUX2.

Table 151: Description of Testsignals

Pins

Testsignal

Description

sdata

shows the actual received data stream.

scoll

shows if in the actual bit a collision has been detected (106 kbit/s only)

svalid

shows if sdata and scoll are valid

sover

shows that the receiver has detected a stop condition

RCV_reset

shows if the receiver is reset

reserved

Table 152: TestSel2Reg register (address 0Dh)

Pins

Testsignal

clkstable

clk27/8

clk27

Table 153: Description of Testsignals

Pins

Testsignal

Description

clkstable

shows if the oscillator delivers a stable signal.

clk27/8

shows the output signal of the oscillator divided by 8

D4 to D3

reserved

clk27

shows the output signal of the oscillator

reserved

Table 154: Testsignals description

SelAux

Description for Aux1 / Aux2

0000

Tristate

0001

DAC: register TestDAC 1/2

0010

DAC: testsignal corr1

0011

Reserved

0100

DAC: testsignal MinLevel

0101

DAC: ADC_I

0110

DAC: ADC_Q

0111 - 1001

Reserved

1010

High

1011

low

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