Datasheet

PN532_C1 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2017. All rights reserved.
Product data sheet
COMPANY PUBLIC
Rev. 3.6 — 28 November 2017
115436 118 of 222
NXP Semiconductors
PN532/C1
Near Field Communication (NFC) controller
Several levels of detection can be programmed through the register to offer a large panel
of compatibility to different type of antennas. The high current threshold can be
programmed from 40 mA to 150 mA with 15 mA steps (total current consumption of the
IC). The low current threshold can be programmed from 5mA to 35 mA with 10 mA step
(total current consumption of the IC).
There is no dedicated pin for the output of the detector. The result of the detection is to be
read out from the antenna test register.
• Cases 1 and 2: If the antenna and/or the tuning network are not connected, the TVDD
current is higher than the nominal one. The antenna detector detects this higher
consumption and the andet_up bit in andet_control register is set to high
• Case 3: If the EMC filter is not correctly connected, the current within TVDD is lower
than the nominal one. The antenna detector detects this lower consumption and the
andet_bot bit in andet_control register is set to high.
To have this functionality working properly it is needed to have the transmitter generating
some RF in the antenna.
8.6.9.2 Antenna presence detector register
Table 157. andet_control register (address 610Ch) bit allocation
Bit 7 6 5 4 3 2 1 0
Symbol andet_bot andet_up andet_ithl[1:0] andet_ithh[2:0] andet_en
Reset 0 0 00000 0
Access R R R/W R/W R/W R/W R/W R/W
Table 158. Description of andet_control bits
Bit Symbol Description
7 andet_bot A too low power consumption has been detected
6 andet_up A too high power consumption has been detected
5 to 4 andet_ithl[1:0 Set the low current consumption threshold to be detected
Define the overcurrent threshold
00: do not use
01: do not use
10: 25 mA
11: 35 mA
3 to 1 andet_ithh[2:0] Set the high current consumption threshold to be detected
000: 45 mA
001: 60 mA
010: 75 mA
011: 90 mA
100: 105 mA
101: 120 mA
110: 130 mA
111: 150 mA
0 andet_en Enable the detection of the antenna presence detector functionality.