mfrc531 NXP Semiconductors, mfrc531 Datasheet - Page 37

• Manufacturer Part Number: mfrc531
• Description: Iso/iec 14443 Reader Ic
• Manufacturer: NXP Semiconductors

NXP Semiconductors
MFRC531_34
Product data sheet
PUBLIC
9.11.2.1 Active antenna concept
Table 28.
See
The TxControl register ModulatorSource[1:0] bits define the signal used to modulate the
transmitted 13.56 MHz energy carrier. The modulated signal drives pins TX1 and TX2.
Table 29.
See
The MFOUTSelect register MFOUTSelect[2:0] bits select the output signal which is to be
routed to pin MFOUT.
Table 30.
See
To use the MFOUTSelect[2:0] bits, the TestDigiSelect register SignalToMFOUT bit must
be logic 0.
The MFRC531 analog and digital circuitry is accessed using pins MFIN and MFOUT.
Table 31
Number
0
1
2
3
Number
0
1
2
3
Number
0
1
2
3
4
5
6
7
Table 93 on page 64
Table 93 on page 64
Table 106 on page 67
lists the required settings.
DecoderSource
[1:0]
00
01
10
11
ModulatorSource
[1:0]
00
01
10
11
MFOUTSelect
[2:0]
000
001
010
011
100
101
110
111
DecoderSource[1:0] values
ModulatorSource[1:0] values
MFOUTSelect[2:0] values
Rev. 3.4 — 26 January 2010
for additional information.
for additional information.
for additional information.
Signal routed to pin MFOUT
constant LOW
constant HIGH
modulation signal (envelope) from the internal encoder
serial data stream to be transmitted; the same as for
MFOUTSelect[2:0] = 001 but not encoded by the selected pulse
encoder
output signal of the receiver circuit; card modulation signal
regenerated and delayed
output signal of the subcarrier demodulator; Manchester coded card
signal
reserved
reserved
Input signal to decoder
constant 0
output of the analog part. This is the default configuration
direct connection to pin MFIN; expects an 847.5 kHz subcarrier
signal modulated by a Manchester encoded signal
direct connection to pin MFIN; expects a Manchester encoded
signal
Input signal to modulator
constant 0 (energy carrier off on pins TX1 and TX2)
constant 1 (continuous energy carrier on pins TX1 and TX2)
modulation signal (envelope) from the internal encoder. This is the
default configuration.
direct connection to MFIN; expects a Miller pulse coded signal
056634
ISO/IEC 14443 reader IC
MFRC531
© NXP B.V. 2010. All rights reserved.
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