Datasheet

PN512 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2016. All rights reserved.
Product data sheet
COMPANY PUBLIC
Rev. 5.2 — 16 June 2016
111352 56 of 137
NXP Semiconductors
PN512
Full NFC Forum-compliant frontend
8.2.3.7 GsNOnReg
Selects the conductance for the N-driver of the antenna driver pins TX1 and TX2 when the
driver is switched on.
8.2.3.8 CWGsPReg
Defines the conductance of the P-driver during times of no modulation
Table 93. GsNOnReg register (address 27h); reset value: 88h, 10001000b
7 6 5 4 3 2 1 0
CWGsNOn ModGsNOn
Access
Rights
r/w r/w r/w r/w r/w r/w r/w r/w
Table 94. Description of GsNOnReg bits
Bit Symbol Description
7 to 4 CWGsNOn The value of this register defines the conductance of the output
N-driver during times of no modulation. This may be used to regulate
the output power and subsequently current consumption and
operating distance.
Note: The conductance value is binary weighted.
Note: During soft Power-down mode the highest bit is forced to 1.
Note: This value is only used if the driver TX1 or TX2 are switched on.
Otherwise the value of the bits CWGsNOff of register GsNOffReg is
used.
3 to 0 ModGsNOn The value of this register defines the conductance of the output
N-driver for the time of modulation. This may be used to regulate the
modulation index.
Note: The conductance value is binary weighted.
Note: During soft Power-down mode the highest bit is forced to 1.
Note: This value is only used if the driver TX1 or Tx2 are switched on.
Otherwise the value of the bits ModsNOff of register GsNOffReg is
used.
Table 95. CWGsPReg register (address 28h); reset value: 20h, 00100000b
7 6 5 4 3 2 1 0
00 CWGsP
Access
Rights
RFU RFU r/w r/w r/w r/w r/w r/w
Table 96. Description of CWGsPReg bits
Bit Symbol Description
7 to 6 - Reserved for future use.
5 to 0 CWGsP The value of this register defines the conductance of the output
P-driver. This may be used to regulate the output power and
subsequently current consumption and operating distance.
Note: The conductance value is binary weighted.
Note: During soft Power-down mode the highest bit is forced to 1.