The ST21NFCD is a single NFC controller IC designed for integration in mobile devices and NFC compliant products. It includes NFC functions in the three operating modes: Card Emulation, Reader/Writer and Peer to Peer communication.
This product is based on an advanced ARM Cortex-M3 32-bit microcontroller running at 28 MHz.
All internal operations are synchronized by a Clock Generator module.
Two clock source options are available: using an external Quartz or using an external reference clock (in order to reduce the number of external components).
Thanks to an enhanced power switch system, the ST21NFCD manages the power supply of the device and its associated Secure Elements.
The ST21NFCD supports NCI 2.0.
In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark.
ARM® Cortex®-M3 microcontroller
eFlash for full firmware update
Enhanced Active load modulation technology
Enhanced TX drive up to 1.3 W
Compatible with extremely small or metal frame antennas
Optimized power consumption modes
Battery voltage monitoring
FracN PLL input range from 13 to 76.8 MHz
27.12 MHz external crystal oscillator
LDOs for internal voltages
2 ₓ LDOs for external voltages
Voltage detectors for supplies monitoring
Low power mode state machine
Automatic Wake-Up via communication interfaces, internal timers, GPIO, RF field or tag detection
Support of an external DC/DC converter for TX supply
Active and passive Peer-to-Peer
ISO/IEC 18092 - NFCIP-1 Initiator & Target
Passive mode – Reader/Writer
NFC Forum Type 1/2/3/4/5 tags
Thinfilm (ex Kovio) Barcode
Active mode – Card Emulation
ISO/IEC 14443 Type A & B
JIS X 6319 – 4
MIFARE® Classic(a)(b) through SWP-CLT
External communication interfaces
Two SWP master interfaces up to 1.695 Mbit/s
I2C slave interface up to 3.4 MHz
Slave and master SPI interface (up to 13 MHz)
HSUART interface up to 6 Mbit/s
Secure firmware update mechanism
Battery voltage support from 2.4 V to 5 V
I/O dedicated voltage level (VPS_IO) from 1.62 V to 3.3 V
Supports Class B and C operating conditions for UICC