Data Sheet

Data Sheet
6141 Running Springs Rd
San Jose, CA 95135
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Page 14 of 24
August 3, 2022
5.3.2.2 NFCT Electrical Specification
Symbol
Description
Min.
Typ.
Max.
Units
f
c
Frequency of operation
13.56
MHz
C
MI
Carrier modulation index
95
%
DR
Data Rate
106
kbps
V
sense
Peak differential Field detect threshold level on
NFC1 NFC2
1.2
Vp
I
max
Maximum input current on NFCT pins
80
mA
Table 9: NFCT electrical specification
6 Functional description
6.1 Clocks
Module integrates 32MHz and 32KHz crystals for hi-frequency clock (HFCLK, 64MHz) and low-frequency
clock (LFCLK, 32KHz).
An integrated RC based low-frequency clock (LFRC) is also available with a reduced accuracy. LFRC needs
calibration.
6.2 RESET pin
Module reset can be triggered by following methods
● Power on reset generator
● Pin reset
● Wake up from system off mode
● Soft reset
● Brownout reset
6.3 Security
This module integrates Nordic Semi’s nRF52840 SoC. This SoC supports the following security functions
which we use in our APIs that we provide to user.
6.3.1 AAR — Accelerated address resolver
Accelerated address resolver is a cryptographic support function for implementing the Resolvable Private
Address Resolution procedure described in Bluetooth Core Specification v4.0. Resolvable Private Address
generation should be achieved using ECB and is not supported by AAR.
The procedure allows two devices that share a secret key to generate and resolve a hash based on their
device address. The AAR block enables real-time address resolution on incoming packets when configured
as described in this chapter. This allows real-time packet filtering (whitelisting) using a list of known shared
keys (Identity Resolving Keys (IRK) in Bluetooth).