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- Manufacturer: Pololu
- Order number: EXP-R25-370
- Manufacturer part number: 2595
- Availability: 41
- country of origin: US
- HS code: 85439000
- Weight (kg): 0.01
The logic high levels on each side of the shifter are achieved by 10 kΩ pull-up resistors to their respective supplies; these provide quick enough rise times to allow decent conversion of fast mode (400 kHz) I²C signals or other similarly fast digital interfaces (e.g. SPI or asynchronous TTL serial). External pull-ups can be added to speed up the rise time further at the expense of higher current draw. See the schematic diagram below for more information.
- Dual-supply bus translation:
- Lower-voltage (LV) supply can be 1.5 V to 7 V
- Higher-voltage (HV) supply can be LV to 18 V
- Four bidirectional channels
- Small size: 0.4″ × 0.5″ × 0.08″ (13 mm × 10 mm × 2 mm)
- Breadboard-compatible pin spacing
This logic level converter requires two supply voltages: the lower-voltage logic supply (1.5 V to 7 V) connects to the LV pin and the higher-voltage supply (LV to 18 V) connects to the HV pin. The HV supply must be higher than the LV supply for proper operation. Logic low voltages will pass directly from Hx to the corresponding Lx (and vice versa), while logic high voltages will be converted between the HV level to the LV level as the signal passes from Hx to Lx or Lx to Hx.
The level shifter circuit does not require a ground connection to either device, so there are no ground pins on the board. (Some competing level shifter modules provide ground connections that simply act as a pass-through; we have opted to leave these off and make the board smaller.) The two devices being connected through the level shifter must still share a common ground.