3
Overview
3.1
ST25DV-I2C tag
The ST25DV-I2C tag is a dynamic tag IC for contactless applications (ISO 15693). It manages the RF
communication with a reader. It also includes frame coding, RF modulation and manages the anti-collision
process.
The ST25DV-I2C tag works as an NFC Forum Type 5 tag, supporting: detection, read and write operations. As
shown in
, this device communicates with a reader without any external controller.
Figure 1.
Communication scheme
MCU
ST25DV-I2C
RF
I
2
C
3.2
STM32L476xx microcontroller devices
The STM32L476xx microcontroller devices are ultra-low-power microcontrollers based on the high-performance
Arm
®
32-bit RISC core operating at a frequency of up to 80 MHz. The Arm
®
Cortex
®
-M4 core features a
floating point unit (FPU) single precision, which supports all Arm
®
single-precision data-processing instructions
and data types. It also implements a full set of DSP instructions and a memory protection unit (MPU) to enhance
application security.
The STM32L476xx microcontroller devices embed high-speed memories (up to 1 Mbytes of Flash memory,
up to 128 Kbytes of SRAM), a flexible external memory controller (FSMC) for static memories (for devices
with packages of 100 pins and more), a Quad-SPI Flash memory interface (available on all packages) and an
extensive range of enhanced I/Os and peripherals connected to two APB buses, two AHB buses and a 32-bit
multi-AHB bus matrix.
The STM32L476xx microcontroller devices embed several protection mechanisms for embedded Flash memory
and SRAM: readout protection, write protection, proprietary code readout protection and firewall.
These devices offer up to three fast 12-bit ADCs (5 Msps), two comparators, two operational amplifiers, two
DAC channels, an internal voltage reference buffer, a low-power RTC, two general-purpose 32-bit timers, two
16-bit PWM timers dedicated to motor control, seven general-purpose 16-bit timers, and two 16-bit low-power
timers. The STM32L476xx microcontroller devices support four digital filters for external sigma delta modulators
(DFSDM).
In addition, up to 24 capacitive sensing channels are available. The devices also embed an integrated LCD driver
8x40 or 4x44, with internal step-up converter.
They also feature standard and advanced communication interfaces:
•
Three I²Cs
•
Three SPIs
•
Three USARTs, two UARTs and one Low-power UART.
•
Two SAIs (serial audio interfaces)
•
One SDMMC
•
One CAN
•
One USB OTG full-speed
•
One SWPMI (single wire protocol master interface)
For full details of the STM32L476xx microcontroller device specifications, refer to
.
UM2949
Overview
UM2949
-
Rev 1
page 4/60
