mfrc531 NXP Semiconductors, mfrc531 Datasheet - Page 58

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

NXP Semiconductors
MFRC531_34
Product data sheet
PUBLIC
10.5.3.3 CwConductance register
10.5.3.4 ModConductance register
Selects the conductance of the antenna driver pins TX1 and TX2.
Table 71.
Table 72.
See
Defines the driver output conductance.
Table 73.
Table 74.
Remark: When Force100ASK = logic 1, the GsCfgMod[5:0] value has no effect.
See
Bit
Symbol
Access
Bit
7 to 6
5 to 0
Bit
Symbol
Access
Bit
7 to 6
5 to 0
Section 9.9.3 on page 30
Section 9.9.3 on page 30
CwConductance register (address: 12h) reset value: 0011 1111b, 3Fh bit
allocation
CwConductance register bit descriptions
ModConductance register (address: 13h) reset value: 0011 1111b, 3Fh bit
allocation
ModConductance register bit descriptions
Symbol
00
GsCfgCW[5:0]
Symbol
00
GsCfgMod[5:0]
7
7
R/W
00
R/W
Rev. 3.4 — 26 January 2010
00
6
6
Description
these values must not be changed
defines the conductance register value for the output driver. This
can be used to regulate the output power/current consumption and
operating distance.
for detailed information about GsCfgCW[5:0].
for detailed information about GsCfgMod[5:0].
056634
Description
these values must not be changed
defines the ModConductance register value for the output
driver during modulation. This is used to regulate the
modulation index.
5
5
4
4
GsCfgCW[5:0]
GsCfgMod[5:0]
3
3
R/W
R/W
ISO/IEC 14443 reader IC
2
2
MFRC531
© NXP B.V. 2010. All rights reserved.
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