UM-B-077
DA14681 Wearable Development Kit Hardware Manual
User Manual
Revision 1.2
06-Apr-2017
CFR0012
32 of 47
© 2017 Dialog Semiconductor
5
DA14681 Reference Design - Daughterboard
The DA14681 reference design daughterboard consists of the following components:
●
Near Field Communication (NFC) module
●
Capacitive touch controller
5.1
Near Field Communication (NFC)
Near field communication is a short range wireless connectivity technology designed to establish
communication between two devices. The NFC technology in this reference design is used for
contactless (proximity) smartcards and the related standard is ISO 14443. The main characteristics
of NFC are the operating frequency of 13.56 MHz and the 10 cm range. Typical applications include:
ticketing, payment access etc. The NFC module used in this reference design is the LA66002 from
Infineon and is suitable to implement the following modes:
●
Read/Write Mode:
The NFC module reads data from an NFC smart object and acts accordingly.
NFC smart poster applications can be supported via the ISO 14443 scheme
●
Card Emulation Mode:
The NFC module emulates a contactless card to enable operations such
as contact less payments, ticketing etc.
In the NFC module LA66002 the Read/Write mode is implemented via the Host Communication
mode of the secure element (SE). The communication between the NFC module and the host
(DA14681) is established via the ISO 7816 standard. The Card Emulation (contactless) mode is
implemented via the RF Communication Mode and is executed by the analog front-end of the NFC
module. A simplified top level block diagram of the NFC module is shown in
Figure 27
.
NFC
Analog Front End
NFC
Secure element (SE)
VCC
ISO7816
VCC for SE
Interface
(UART,I2C
NFC Module (LA66002)
Figure 27: Simplified Block Diagram of the NFC Module
