UM-B-077
DA14681 Wearable Development Kit Hardware Manual
User Manual
Revision 1.2
06-Apr-2017
CFR0012
33 of 47
© 2017 Dialog Semiconductor
Figure 28: NFC Module Schematic
The LA66002 is a boosted NFC module providing hassle free and immediate connectivity, unlike
traditional NFC devices that sometimes are unable to establish immediate connection. So it works
much better in payment or in transport infrastructure applications where the transactions are faster.
From a hardware perspective, the benefits of using a boosted NFC device are the use of a smaller
antenna, which is mostly incorporated in the NFC module, and that there is no need for an external
antenna and front-end.
Due to its high power consumption during operation the LA66002 NFC module is powered separately
by a 3.3 V LDO (
AP2127K-3.3TRG1
from Diodes Inc).
Table 16: NFC Module Pin Description (Partial)
Pin Number
Pin Name
Description
5
ENVDDSE
Digital input that controls VDD of the secure element.
6
7816CLK
Clock when in ISO 7816 usage.
10
7816RST
ISO 7816 enable/disable pin, when high host communication mode is
activated.
17
7816IO
Half duplex IO port when in ISO 7816 mode.
19
VDDSE
Power supply for the secure element (SE) in the NFC module.
Table 16
gives a description of the most important pins of the NFC module, the voltage level of which
determines the operating mode: Communication mode or RF mode.
Figure 29
outlines the schematic
implementation of the Communication mode. The logic values for each signal per mode are
illustrated in
Figure 30
and
Figure 31
.
