NXP Semiconductors
UM10858
PN7462 family HW user manual
UM10858
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User manual
COMPANY PUBLIC
Rev. 1.4 — 14 May 2018
314514
201 of 345
12.8 Adaptive Waveform Control (AWC)
Depending on the level of detected detuning of the antenna, RF wave shaping related
register settings can be automatically updated. The shaping related register settings are
stored in a lookup table located in EEPROM, and selected dependent on the actual gear.
The gear numbers need to be provided as part of the lookup table entries and need to be
provided in ascending order in the EEPROM. Each lookup table entry allows to configure
not only a dedicated wave shaping configuration for the corresponding gear, but in
additionally it is possible to configure for this gear the wave shaping configuration
dependent on the different protocols.
Each lookup table item contains a bitmask of technology and baud rate (in order to use
an entry for multiple technologies and baud rates), the DPC Gear and a relative value
(change compared to actual setting of register
CLIF_ANA_TX_SHAPE_CONTROL_REG) for TX_SET_TAU_MOD_FALLING,
TX_SET_TAU_MOD_RISING and TX_RESIDUAL_CARRIER.
Table 244. PCD Shaping entry definition
Each entry contains 32 bit.
In case of a gear switch, a EEPROM lookup is performed if the current gear (at current
protocol and baud rate) has an assigned wave shaping configuration. In case of an
execution of a LoadProtocol command, this lookup will be performed (example: switching
from baud rate A106 to A424) as well. The change from the wave shaping configuration
as configured by
phhalRf_LoadProtocol
is relative, which means that bits are added or
bit #
Definition
31 … 29
RFU, don’t use.
Must be 0.
28
180003m3
Enabling a protocol enables the defined PCD shaping
setting changes, as defined in bit 15 … 4 for the defined
gear as defined in bit 3 … 0.
One or more protocols can be enabled.
27
15693 @ASK100%
26
15693 @ASK10%
25
NFC type F @424
24
NFC type F @212
23
14443 type B @848
22
14443 type B @424
21
14443 type B @212
20
14443 type B @106
19
14443 type A @848
18
14443 type A @424
17
14443 type A @212
16
14443 type A @106
15 …12
Residual carrier
Sign bit + 3 bit value
11 … 8
TAU_MOD_RISING
Sign bit + 3 bit value
7 … 4
TAU_MOD_FALLING
Sign bit + 3 bit value
3 … 0
Gear number
Gear number 1 … 14
