Rev. 1.00
206
September 11, 2018
Rev. 1.00
207
September 11, 2018
HT45F4050
A/D NFC Flash MCU
HT45F4050
A/D NFC Flash MCU
HT45F4050
HT8
MCU
Core
I/O
ADC
NFC
Antenna
Temperature
Sensor
Humidity
Sensor
I
2
C
I/O
Flash
Memory
LED
SPI
I/O
Button
1. Regarding the hardware, the demo board is composed of a Hotek HT8 microcontroller
integrated with NFC function, a temperature sensor (833ET-2), a humidity sensor (DHT12),
an SPI Flash data memory and an NFC induction antenna. The board power is a button
battery which provides power for transmitting sensor data to the Flash memory via the
SPI interface. After the data has been stored into the Flash memory, PCs or Android
application softwares such as a Graphical User Interface (GUI) can access the NFC
EEPROM.
2. Regarding the software, a dedicated PC or Android GUI uses an NFC reader or NFC
mobilephone to communicate with the HT45F4050 NFC module via the NFC interface,
the HT45F4050 NFC module uses the SPI interface to communicate with the Flash
memory on board.
3. Regarding the data storage stage, the power of the data logger demo board is supplied by
a button battery and the sensor data are stored into the Flash Memory at fixed intervals.
Data logging is implemented using the SPI interface. The recorded data contain the
environment temperature data measured by the 833ET-2 and the humidity data measured
by the DHT12.
4. Regarding the data read stage, the domo board acts as a passive NFC tag after the data are
stored into the Flash memory and the HT45F4050 is still power-supplied by VDD. An
induction antenna on board is used for radio frequency communication between the tag
and reader. Making use of the coupling effect between the NFC reader antenna and the
HT45F4050 antenna, the Flash memory internal data can be read.