CEIDI laboratory power design and installation is an important part of laboratory decoration design. Not only should the power supply voltage be 220V or 380V, but also the size of the power supply should be considered to avoid affecting the normal use of equipment. Therefore, the design and installation of laboratory power needs to first determine the circuit form of each internal module and analyze it. Shanghai laboratory construction experts will provide you with detailed explanations of 16 common module circuit analysis in the laboratory.

CEIDI laboratory power design and installation: modular circuit

1. RS232 communication circuit

Two-way 232 communication circuit: 3-wire connection, corresponding to a female connector, working voltage 5V, MAX202 or MAX232 can be used.

2. Transistor serial communication

Triode serial communication: A simple circuit built with a triode, with good effect and low cost, generally very good at low baud rates.

3. Single RS232 communication

Single-channel 232 communication circuit: three-wire mode, 5V power supply, the effect is the same as the triode serial port communication.

4. USB to RS232

USB to 232 circuit: PL2303HX is used, which has low cost and good stability.

5. Reset circuit

SP706S reset circuit: with watchdog and manual reset, the price of common brands is very cheap, R4 is used for debugging, and R4 is welded after debugging.

6. SD card module circuit

SD card module circuit (with lock): Control the power of the SD card through the port, which is relatively complete and can be used for 5V and 3.3V. Knowledge should be noted that the use of 5V and 3.3V is different for some specific devices.

7. LCM12864 liquid crystal display circuit

LCM12864 liquid crystal module (ST7920): the common 12864 circuit, the price is cheap, and there is a Chinese character library. You can select whether the working mode is serial or parallel by the level of the PSB port, and it has a backlight control function.

8. LCD1602 liquid crystal display circuit

LCD1602 character liquid crystal module (KS0066): The most commonly used character liquid crystal module, the function is relatively simple, only display numbers and characters, can be controlled by 4 or 8 bits, with backlight function.

9. Full duplex RS485 circuit

Full-duplex RS485 circuit (with protection function): with protection function, full-duplex 4-wire communication mode, suitable for long-distance communication.

10. Half-duplex RS485 circuit

RS485 half-duplex communication module: You can choose different ports to adjust the direction of data transmission, with protection power, and can only work at 5V.

11. JTAG emulation interface

ARM JTAG simulation interface circuit: relatively complete, often used under ARM chips, with automatic download function.

12. DC5V output circuit

5V power module: the circuit is simple, the direct plug can reach 1.5A, and the patch can reach 1A.

13. DC3.3V power output circuit

3.3 Power module: It can reach 800mA, the price is cheap, and there are corresponding 1.8/1.2 chips for direct replacement.

14. Commonly used switching power supply circuits

Commonly used switching power supply circuit: The power supply can reach 3A, and the IC can be replaced, but the circuit needs to be adjusted partially while being replaced.

15. DS1302 clock circuit

DS1302 digital clock: a very popular clock circuit, easy to use, low cost.

16. AT24C02 communication circuit

AT24C02 (EEPROM): The most commonly used EEPROM circuit.

The above is a detailed analysis of important knowledge about laboratory power design and installation. This article explains in detail the circuit analysis of 16 common modules in the laboratory. For more detailed analysis of the relevant knowledge of laboratory power design and installation, please click "Technical Support" to view.