The ST21NFCJ is a single near-field communication (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:
Thanks to an enhanced power switch system, the ST21NFCJ manages the power supply of the device and its associated secure elements.
The ST21NFCJ supports NCI 2.0.
The ST21NFCJ comes in a 75-ball WFBGA package. It is pin-compatible with the ST54J product in wafer-level chip-scale package (WLCSP81).
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.
The product can come with MIFARE Classic. The availability of the MIFARE Classic R/W mode feature depends on the license conditions.
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 phase-locked loop (PLL) input range from 13 to 76.8 MHz
27.12 MHz external crystal oscillator
Integrated power management unit (PMU)
low-dropout (LDO) regulators for internal voltages
2 × LDO regulators for external voltages
Voltage detectors for supplies monitoring
Low power mode state machine
Automatic Wakeup via communication interfaces, internal timers, general-purpose input/output (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 and Type B
JIS X 6319 – 4
MIFARE Classic through SWP-CLT
External communication interfaces
Two single-wire protocol (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)
High-speed universal asynchronous receiver transmitter (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 universal integrated circuit cards (UICCs)