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 41 of 137
NXP Semiconductors
PN512
Full NFC Forum-compliant frontend
8.2.2.6 TxAutoReg
Controls the settings of the antenna driver.
Table 57. TxAutoReg register (address 15h); reset value: 00h, 00000000b
7 6 5 4 3 2 1 0
AutoRF
OFF
Force100
ASK
Auto
WakeUp
0 CAOn InitialRF
On
Tx2RFAuto
En
Tx1RFAuto
En
Access
Rights
r/w r/w r/w RFU r/w r/w r/w r/w
Table 58. Description of TxAutoReg bits
Bit Symbol Description
7 AutoRFOFF Set to logic 1, all active antenna drivers are switched off after the last
data bit has been transmitted as defined in the NFCIP-1.
6 Force100ASK Set to logic 1, Force100ASK forces a 100% ASK modulation
independent of the setting in register ModGsPReg.
5 AutoWakeUp Set to logic 1, the PN512 in soft Power-down mode will be started by
the RF level detector.
4 - Reserved for future use.
3 CAOn Set to logic 1, the collision avoidance is activated and internally the
value n is set in accordance to the NFCIP-1 Standard.
2 InitialRFOn Set to logic 1, the initial RF collision avoidance is performed and the bit
InitialRFOn is cleared automatically, if the RF is switched on.
Note: The driver, which should be switched on, has to be enabled by
bit Tx2RFAutoEn or bit Tx1RFAutoEn.
1 Tx2RFAutoEn Set to logic 1, the driver Tx2 is switched on after the external RF field
is switched off according to the time TADT. If the bits InitialRFOn and
Tx2RFAutoEn are set to logic 1, Tx2 is switched on if no external RF
field is detected during the time TIDT.
Note: The times TADT and TIDT are defined in the NFC IP-1 standard
(ISO/IEC 18092).
0 Tx1RFAutoEn Set to logic 1, the driver Tx1 is switched on after the external RF field
is switched off according to the time TADT. If the bit InitialRFOn and
Tx1RFAutoEn are set to logic 1, Tx1 is switched on if no external RF
field is detected during the time TIDT.
Note: The times TADT and TIDT are defined in the NFC IP-1 standard
(ISO/IEC 18092).