mfrc531 NXP Semiconductors, mfrc531 Datasheet - Page 57

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

NXP Semiconductors
MFRC531_34
Product data sheet
PUBLIC
10.5.3.1 Page register
10.5.3.2 TxControl register
10.5.3 Page 2: Transmitter and control
Selects the page register; see
Controls the logical behavior of the antenna pin TX1 and TX2.
Table 69.
Table 70.
Bit
Symbol
Access
Bit
7
6 to 5
4
3
2
1
0
Symbol
0
ModulatorSource[1:0]
Force100ASK
TX2Inv
TX2Cw
TX2RFEn
TX1RFEn
TxControl register (address: 11h) reset value: 0101 1000b, 58h bit allocation
TxControl register bit descriptions
R/W
7
0
ModulatorSource
6
Rev. 3.4 — 26 January 2010
[1:0]
R/W
5
056634
Section 10.5.1.1 “Page register” on page
Value
-
00
01
10
11
-
0
1
0
1
0
1
0
100ASK
Force
selects the source for the modulator input:
Description
this value must not be changed
forces a 100 % ASK modulation independent
ModConductance register setting
delivers an inverted 13.56 MHz energy carrier output
signal on pin TX2
delivers a continuously unmodulated 13.56 MHz
energy carrier output signal on pin TX2
enables modulation of the 13.56 MHz energy carrier
the output signal on pin TX2 is the 13.56 MHz energy
carrier modulated by the transmission data
TX2 is driven at a constant output level
the output signal on pin TX1 is the 13.56 MHz energy
carrier modulated by the transmission data
TX1 is driven at a constant output level
R/W
4
modulator input is LOW
modulator input is HIGH
modulator input is the internal encoder
modulator input is pin MFIN
TX2Inv
R/W
3
TX2Cw TX2RFEn TX1RFEn
R/W
2
ISO/IEC 14443 reader IC
MFRC531
R/W
© NXP B.V. 2010. All rights reserved.
48.
1
R/W
57 of 116
0