Small, low pin count flash PIC microcontrollers with small, flexible features and applications

Single chip microcomputer STM32L151CCU6

Mobile phone crystal 3.2*2.5mm 3225 26M (26.000MHZ) 7.5PF 10PPM 20PPM 30PPM

Test - lowercase JPG memory 82K

MICroChip's small, low pin count flash PIC microcontrollers are small and flexible, bringing convenience to development, design and production. The PIC family of microcontrollers is available in a small package that is ideal for applications where size and size are critical.

Introduction to the characteristics of PIC microcontroller

Digital characteristics of PIC microcontrollers

The PIC family of microcontrollers uses the RISC architecture, with 33 instructions for low-end models and 35 instructions for mid-range models. This small microcontroller integrates a variety of digital peripherals; I/O pins can provide up to 20mA of current or sink current to directly drive LEDs or MOSFETs; integrate 8-bit or 16-bit timers, and common I 2 C, SPI and other serial communication interfaces. Some microcontrollers are more integrated with EEPROM and can be used to store functions or look up table parameters.

Mixed signal characteristics

PIC microcontrollers integrate a variety of mixed-signal peripherals. These small PIC microcontrollers follow traditional analog peripherals, including comparators with flip-Flop trigger output modes, which can be configured as hysteresis comparators with features and 555 The timer circuit is similar. An on-chip analog-to-digital converter (ADC) and ultra-low-power wake-up feature allow you to extend the life of your external battery. In addition, some mixed-signal peripherals have been added, such as digital pulse width modulators with auto-shutdown, which is important in some switching power supplies. When a specific external event (such as overvoltage or overcurrent) occurs, the PWM output will be disabled, thus effectively protecting it. With analog PWM peripherals, the user can generate multiphase PWM signals, and the voltage comparator can also change the pulse width. The on-chip shunt regulator can output a constant 5V supply to power the microcontroller or other load.

Development environment support

PIC series microcontrollers not only have rich hardware resources, but also have a good software development environment. Microchip offers a free Mplab integrated development environment that supports the development of all small flash microcontrollers with an integrated editor, assembler and compiler. If you only use assembly language for program development, you can use this environment to complete the writing, compiling, debugging, emulation, and binary code generation. The programming of the new device is very simple, using either the traditional Mplab ICD2 tool or the PICKit2 programmer. Mplab ICD2 is a tool that combines a serial programmer with an in-circuit debugger. Both tools use a USB interface for ease of use.

Internal monitoring circuit and support features

Because Microchip's microcontrollers integrate rich monitoring circuitry and peripheral resources on-chip, many external components can be eliminated when designing embedded systems. The on-chip monitoring circuit and support features include: (1) internal 4/8MHz oscillator, which can continue to divide, up to 32KHz, and can also be used as system clock; (2) Two-speed start function, which means external oscillation in the microcontroller. When the device is used as the main clock, the MCU will first run on the internal oscillator until the external oscillator is stable. (3) The oscillator failover function will automatically switch to the internal oscillator to handle abnormal events when the external oscillator fails. (4) Some small single-chip microcomputers can switch between external crystal oscillator and internal RC oscillator clock; (5) built-in watchdog timer, undervoltage reset and other monitoring circuits for handling unpredictable problems during program operation; 6) Built-in voltage regulator.

The shunt regulator is actually a Zener diode connected in parallel with the microcontroller V DD . The external input voltage is limited by the series resistor, so that the voltage on the Zener diode is fixed at 5V. Selecting a suitable series resistor allows the external input voltage to reach 500V. The selection of series resistance can be referred to the relevant literature.

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