PIC MCU Learning Materials (I): Interface Design

PIC microcontroller (Peripheral Interface Controller) is an integrated circuit (IC) used to develop and control peripheral devices. Now the application field of PIC microcontroller is quite extensive. In order to facilitate engineers to learn PIC microcontroller well, Electronics Enthusiasts Network has sorted out the relevant knowledge and application of PIC microcontroller. Now let's learn the application of PIC microcontroller in interface design.

1. Interface design between SPI serial EEPROM and PIC microcontroller   

There are many types of microcontrollers on the market that are used in embedded control system designs, and a large part of these embedded control systems require non-volatile memory. Serial EEPROM has become the first choice for non-volatile memory due to its small package size, flexible storage capacity, low I/O pin requirements, low power consumption and low cost.

2. Interface design between touch sensor QST108 and PIC microcontroller

QST108 is a capacitive touch sensor launched by STMicroelectronics for touch button control of human-machine interface.

Its working principle adopts the patented charge transfer capacitor technology (QProx) of Quantum Corporation of the United States. It supports 8 independent buttons and can choose two normal working modes: button state detection output or I2C bus control. At the same time, it can enter low power mode through software commands and can be awakened when a button is pressed. The unique adjacent button suppression algorithm of QST108 makes other buttons in an invalid state when a button is pressed but not released; the self-calibration and automatic drift compensation functions make it unnecessary to calibrate manually, thus further reducing the application difficulty of QST108. The pin configuration is shown in Figure 1, and the functions of each pin are listed in Table 1.