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1, if the power supply of the high-voltage area and low-voltage area have been common ground, the GND in this module only needs to be connected to 1 ground.
2, the conversion module is equivalent to a straight line, each port corresponds to each other, only the voltage on both sides is not the same, so as to achieve the communication between different levels.
3, this module can not be used as a voltage regulator or transformer function, can only be used for small current communication between IO port levels.
4、This module has no soldered pins, but has matching.
Product Characteristics:
Due to some microcontroller development board and equipment is 3.3V work, and there are also microcontroller development board and equipment, sensors, etc. is the 5.0V working power, so when the two need to communicate, there is a working voltage inconsistency, so that the user is not convenient to use. This product is designed to address this issue and solve this problem. This module provides feasibility in different devices of 3.3V and 5.0V and plays the role of bridging.
Product Parameters:
Self-contained 3.3V voltage output with power indicator, power input with anti-reverse connection protection, and can provide no more than 150mA external current. Stable communication baud rate within 28800bps. Module is compatible with breadboard, can be directly plugged into the breadboard to use.
Product application scope:
1, 5V microcontroller and 3.3V microcontroller serial communication.
2, 3.3V serial port downloader and 5V microcontroller serial port communication.
3, 5V microcontroller and 3.3V application module serial communication.
4、It can realise 5V and 3.3V level communication of serial port directly.
5, can achieve UART, IIC, 1-wire, SPI and other bus signals 3V-5V level bidirectional conversion.
Jcat
Reviewed in the United States on September 7, 2024
These are compact and simple bi-directional level shifters, but limited in their switching speed. The pins are normally held at the supply voltage on either side, but drop to ~1mv when the opposite side is pulled low. I haven't directly tested switching speed, as I'm just using this for simple triggering, but I've seen numerous reports of the BSS138s being the source of problems when used in I2C and other higher-speed signals. The product page lists a maximum rate of 28,000 bit per second, which is quite slow (it's literally 1990's modem speeds...). If you're trying to bridge a com bus, you may be better served by a different part. For what it's worth, the pins were easily soldered for breadboarding. These were really inexpensive, but do their stated job well.In passing, the underlying mosfet in these boards appears to be a BSS138, which should be capable of faster switching speeds (several MHz) than stated in the product page, but there are apparently other factors in the board's design that may limit the signal rate.
Kyle
Reviewed in the United States on September 27, 2024
These logic level converters are essential for interfacing devices with different voltage levels. The bi-directional capability allows for communication in both directions, and the support for I2C, I2C, UART, and SPI protocols makes them versatile for a wide range of applications. I've used them to connect 3.3V sensors to 5V microcontrollers without any issues. They're a reliable and convenient solution for ensuring seamless communication between devices with different voltage requirements.
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