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MFRC522 Datasheet(PDF) 43 Page - NXP Semiconductors

Part # MFRC522
Description  Contactless Reader IC
PDF  109 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

MFRC522 Datasheet(HTML) 43 Page - NXP Semiconductors

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© NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 3.2 — 22 May 2007
43 of 109
NXP Semiconductors
MFRC522
Contactless Reader IC
9.2.4.9
AnalogTestReg
Controls the pins AUX1 and AUX2
[1]
Remark: Current output. The use of 1 k
Ω pull-down resistor on AUX is recommended
Table 119: AnalogTestReg register (address 38h); reset value: 00h
Bit
7
6
5
4
3
2
1
0
Symbol
AnalogSelAux1
AnalogSelAux2
Access
Rights
r/w
r/w
Table 120: Description of AnalogTestReg bits
Bit
Symbol
Description
7 to 4
3to 0
AnalogSelAux1
AnalogSelAux2
Controls the AUX pin.
Remark: All test signals are described in Section 19 “Testsignals”.
Value
Description
0000
Tristate
0001
Output of TestDAC1 (AUX1), output of TestDAC2 (AUX2) [1]
0010
Testsignal Corr1 [1]
0011
Reserved
0100
Testsignal MinLevel [1]
0101
Testsignal ADC channel I [1]
0110
Testsignal ADC channel Q [1]
0111
Reserved
1000
Reserved, Testsignal for production test [1]
1001
Reserved
1010
HIGH
1011
LOW
1100
TxActive
At 106 kbit/s: HIGH during Startbit, Databit, Parity and CRC.
At 212, 424 and 848 kbit/s: High during Data and CRC.
1101
RxActive
At 106 kbit/s: High during Databit, Parity and CRC.
At 212, 424 and 848 kbit/s: High during Data and CRC.
1110
Subcarrier detected
106 kbit/s: not applicable
212, 424 and 848 kbit/s: High during last part of Data and
CRC.
1111
Test bus bit as defined by the TstBusBitSel in register
TestSel1Reg.



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