Demystifying AVR microcontroller high-performance portable instrument circuit - circuit diagram reading every day (75)

Single chip microcomputer STM32L151CCU6

With computer technology. With the development of microelectronics technology, industrial instrumentation has gradually developed into an intelligent instrument with a microprocessor system. Portable smart meters are easy to carry. Easy to operate. Friendly interface. Rich man-machine interface. Low power consumption makes it more and more popular in today's life. This paper designs a high-reliability, low-power, multi-purpose portable instrumentation circuit based on the high-performance AVR microcontroller ATXmega128A1 produced by ATMEL, and analyzes its hardware.

Wireless communication circuit design

In the process of using the instrument, when the two instruments need to communicate with each other or are not convenient for wired connection with the PC, the data needs to be transmitted wirelessly. The ability to perform wireless transmission has also become a multi-condition for many instruments. Multi-functional embodiment. Zigbee is an emerging wireless network communication technology standard in recent years, with low power consumption. Low cost and outstanding advantages in applications. The connection time is short, which greatly reduces the collision probability of communication data; the maximum can reach 65,535 network nodes, which makes it have superior networking capability; its data transmission is encrypted, and thus has high network security performance.

Zigbee wireless transmission technology has a wide application prospect. The design uses the AT86RF212 chip, which is a low power consumption. Low-voltage 700/800/900 MHz band wireless transceiver, providing a complete radio interface between antenna and MCU, supporting ZigBee technology IEEE 802.15.4 standard, supporting 6LoW PAN technology and high data transmission rate ISM application, its periphery The circuit connection is shown in Figure 2.

Signal acquisition circuit design

This module uses TLV2543 as the voltage amplitude acquisition, and the necessary voltage conversion is required before data is collected. The chip interface connection is shown in Figure 3. The multi-channel data acquisition channel expands the deficiencies of the MCU. It can use single or multi-channel signal acquisition in the control. It has 11 conversion channels, 12bits voltage conversion accuracy, and up to 10靤 conversion rate. AD chip The data is transmitted using the SPI1 interface of the microcontroller, and its reference voltage is provided by the REF3030 chip.
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