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 64 of 137
NXP Semiconductors
PN512
Full NFC Forum-compliant frontend
8.2.4.6 TestBusReg
Shows the status of the internal testbus.
8.2.4.7 AutoTestReg
Controls the digital selftest.
8.2.4.8 VersionReg
Shows the version.
Table 121. TestBusReg register (address 35h); reset value: XXh, XXXXXXXXb
7 6 5 4 3 2 1 0
TestBus
Access Rights r r r r r r r r
Table 122. Description of TestBusReg bits
Bit Symbol Description
7 to 0 TestBus Shows the status of the internal testbus. The testbus is selected by the
register TestSel2Reg. See Section 19 “
Testsignals”.
Table 123. AutoTestReg register (address 36h); reset value: 40h, 01000000b
7 6 5 4 3 2 1 0
0AmpRcvEOFSO
FAdjust
- SelfTest
Access Rights RFT r/w RFU RFU r/w r/w r/w r/w
Table 124. Description of bits
Bit Symbol Description
7 - Reserved for production tests.
6 AmpRcv If set to logic 1, the internal signal processing in the receiver chain is
performed non-linear. This increases the operating distance in
communication modes at 106 kbit.
Note: Due to the non linearity the effect of the bits MinLevel and
CollLevel in the register RxThreshholdReg are as well non linear.
5 EOFSOFAdjust If set to logic 0 and the EOFSOFwidth is set to 1 will result in the
Maximum length of SOF and EOF according to ISO/IEC14443B
If set to logic 0 and the EOFSOFwidth is set to 0 will result in the
Minimum length of SOF and EOF according to ISO/IEC14443B
If this bit is set to 1 and the EOFSOFwidth bit is logic 1 will result in
SOF low = (11 etu 8 cycles)/fc
SOF high = (2 etu + 8 cycles)/fc
EOF low = (11 etu 8 cycles)/fc
For the behaviour in version 1.0, see Section 20 “
Errata sheet” on
page 109.
4 - Reserved for future use.
3 to 0 SelfTest Enables the digital self test. The selftest can be started by the selftest
command in the command register. The selftest is enabled by 1001.
Note: For default operation the selftest has to be disabled by 0000.