Boardoza LSF0204D Bidirectional Logic Level Translator Breakout Board

This board is a 4-channel bidirectional voltage level translator based on the LSF0204DPWR. It is designed to enable safe and reliable digital communication between systems operating at different logic voltage domains.

The circuit uses two independent reference voltages: V_LOW (Vref_A) and V_HIGH (Vref_B). V_LOW defines the logic HIGH level of the low-voltage domain (e.g., 1.8V / 3.3V MCU systems), while V_HIGH defines the logic HIGH level of the high-voltage domain (e.g., 3.3V / 5V systems). This allows direct interfacing between devices with different logic levels.

The device is based on a passive NMOS architecture, which only actively transfers the LOW state. HIGH levels are defined by external pull-up resistors on both sides, resulting in an open-drain-like behavior. The integrated auto-direction sensing eliminates the need for an external direction control pin.

The EN pin enables or disables the device; when driven LOW, all channels enter a high-impedance (Hi-Z) state, effectively isolating both voltage domains. Signal performance is dependent on the pull-up resistor values and line capacitance, forming an RC time constant that determines rise time.

This module is particularly suitable for I²C, GPIO, and other low-to-medium speed digital interfaces. It also includes onboard pull-up resistors and power indicator LEDs for improved usability and system debugging.