NXP Semiconductors
UM10883
PN7462 family Quick Start Guide - Development Kit
UM10883
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User manual
COMPANY PUBLIC
Rev. 1.6 — 14 May 2018
319816
40 of 120
6.9.2 Proposal for “dynamic” Tx shaping adjustment
Requirement: “static” TX shaping adjustment is done properly.
Step1: Save EEPROM for backup (<Dump EEPROM>), then disable the AWC (<Disable
AWC>), if not done before.
Step2: Start in gear 0 (“unloaded”): <Load Protocol> (for e.g. Type A 106) and enable RF
field (<RF Field On>).
Step 3: <Start Endless> and watch the current gear: must be 0!
Step 4: Check the pulse shape with a Reference PICC and an oscilloscope: Must be ok.
Step 5: Load the antenna, until the gear changes to the next higher one. Move the sliders
<TAU MOD FALLING>, <TAU MOD RISING> and <TX RESIDUAL CARRIER> to
optimize the shaping.
Step 6: <Safe Configuration> -> This stores the AWC settings into the NFC Cockpit table.
The PN7462 EEPROM is not changed at all.
Step 7: Continue with Step 5, until the last gear is reached.
Step 8: <Stop Endless>
Step 9: <Write AWC Data to EEPROM> -> This writes the new AWC data into the look
up table in the PN7462 EEPROM.
Step 10: <Load Protocol> (with the same protocol, e.g. Type A 106) and then send single
or endless REQA. Check the wave shape in all gear positions.
6.10 PN7462 family Rx Matrix test
The receiver settings of the PN7462 family IC normally need to be optimized to achieve
the best performance. This optimization can be done manually, using the test signals.
However, this manual optimization can be cumbersome, since on one hand some of the
register settings depend on each other, so it is almost impossible to derive a
deterministic adjustment. On the other enabling the test bus slightly changes the Rx
performance, so the behavior with enabled or disabled test but can be different.
Therefore, it is recommended to use a Matrix test, which simply tests all relevant
combination of register settings. The result matrix shows easily the optimum settings.
This Matrix test is provided in the NFC cockpit.
6.10.1 Rx parameters
Typically, 3 or 4 (or even more) receiver settings need to be optimized for each protocol
and antenna design:
•
RxGain:
0 ... 3
•
HPCF:
0 ... 3
•
MinLevel:
0 ... 15
•
MinLevelP:
0 ... 15 (only BPSK)
Even though the default values (as delivered with the PNEV7462B) can be taken as
reference and starting point, the optimum might be different from the default. Changing
