Overview

lev4 is a 4 channels bidirectional level shifter (5V / 3.3V) designed to solve voltage compatibility problems between devices, including I2C and SPI buses. lev4 is built around a Texas Instruments TXS0104E chip.

lev4 also provides a LDO regulator ( 3.3V, 500mA ) to supply power for external 3.3V devices.

Technical details

• Based on Texas Instruments TXS0104E.
• Input voltage : 3.6V ≤ VCCB ≤ 5.5V
• Output voltage : 3.3V +/- 1%, 500mA max.
• Port B voltage : 3.6V ≤ VCCB ≤ 5.5V

• Port A voltage : 1.65V ≤ VCCB ≤ 3.3V

• 4 level shifting channels for logical signals with internal "pull-up" 10 KOhms resistors. Channels are designed for classical "open-drain" applications but may also translate push-pull CMOS logic outputs .

• Data rate in "open-drain" applications : 2 Mbps . A bit more if you dare.

• 1 integrated green LED ( voltage indicator light )

• Connector 6 pins : 4 port B signals, 1 pin input power supply 5V, 1 pin GND. ( 6 pos. female header connector provided but not soldered)

• Connector 8 pins : 4 port A signals, 2 pins output power supply 3.3V, 2 pins GND. ( 8 pos. female header connector provided but not soldered)

• The level shifter is wired in "enable" mode by default. By removing (de-soldering or cutting) R2 resistor, the "enable/disable" mode may be remotely controlled by an external controller port. A 2 pins connector is ready for this application. In "disable" mode , all level shifter ports are placed in a high impedance state.

Dimensions

PCB: 50mm x 30mm