User's Manual

Page7
Real Designs
CSR recommends keeping metal objects as far away from the antenna as possible. Keeping metallic
objects out of the near field is usually adequate.
Dielectric materials (like plastic or FR-4) detune an antenna by lowering its resonant frequency. The
effect is not as serious as placing an antenna next to metal objects and can be corrected by reducing the
length of the antenna. Therefore it is important for the antenna to be tuned when it is in the product. This
is done during the development of the product.
2.4 MCU
The STM32F051x family incorporates the high-performance ARM Cortex™-M0 32-bit RISC core
operating at a 48 MHz frequency, high-speed embedded memories (Flash memory up to 64 Kbytes and
SRAM up to 8 Kbytes), and an extensive range of enhanced peripherals and I/Os. All de offer standard
communication interfaces (up to two I2Cs, two SPIs, one I2S, one HDMI CEC, and up to two USARTs),
one 12-bit ADC, one 12-bit DAC, up to five general-purpose 16-bit timers, a 32-bit timer and an
advanced-control PWM timer.vices
The STM32F051x family operates in the -40 to +85 °C and -40 to +105 °C temperature ranges,
from a 2.0 to 3.6 V power supply. A comprehensive set of power-saving modes allows the design of
low-power applications.
The STM32F051x family includes devices in four different packages ranging from 32 pins to 64 pins.
Depending on the device chosen, different sets of peripherals are included. The description below
provides an overview of the complete range of peripherals proposed in this family.
These features make the STM32F051x microcontroller family suitable for a wide range of applications
such as application control and user interfaces, handheld equipment, A/V receivers and digital TV, PC
peripherals, gaming and GPS platforms, industrial applications, PLCs, inverters, printers, scanners, alarm
systems, video intercoms, and HVACs.