Rev. 1.00
166
September 11, 2018
Rev. 1.00
167
September 11, 2018
HT45F4050
A/D NFC Flash MCU
HT45F4050
A/D NFC Flash MCU
Near Field Communication – NFC
The device contains a highly integrated Near Field Communication function, otherwise known as
NFC function, for contactless communication. Originally developed by Philips and Sony based on
RFID contractless transponder and interconnection technologies, the NFC technology has gradually
evolved into various standards by ECMA, ISO/IEC and ETSI. The benefit of NFC technology is that
it allows simple and secure bidirectional interaction between electronic devices.
According to the ISO/IEC 14443 Type A standards and being compatible with the NFC Forum Type
2, this integrated NFC module operates in the 13.56MHz band and with a RF data rate of 106kbit/
s after an extremely short connection time which is less than 0.1s. Being compliant with the ISO/
IEC 14443A Reader/Writer Passive communication mode, the NFC module can be read/written by
other NFC devices within a communication distance of less than 10cm. An NFC EEPROM and an
NFC SRAM are provided for user-defined data, while a series of registers are available for the NFC
function control and an NFC command set is also offered to implement different RF operations.
NFC Power Management
As shown in the following block digram, the MCU core, NFC state machine, NFC memory and
LDO regulator are powered by V
DD
. Due to the small load involved, the LDO does not require the
connection of an external bypass capacitor. The LDO supplies power to the ASK 100% demodulator
and for clock recovery of the NFC AFE. The field detector, limiter and modulator functions in the
NFC AFE are powered by the NFC rectifier.
Limiter
ASK 100%
Demodulator
Modulator
Clock Recovery
Field
Detector
LDO
Regulator
NFC State Machine
NFC Memory
MCU
VDD
VSS
LA
LB
AFE
VSSN