Vref_A

Vref_B

EN

A1

A2

B1

B2

LSF010x

200 k

Vcc

Vcc

Rpu

GPIO

GPIO

GPIO

GPIO

Vref(A) = 1.8 V

Vpu = 5.0 V

Rpu

Rpu

Vpu = 3.3 V

GPIO

GPIO

1.8 V

A3

A4

B3

B4

A5

A6

B5

B6

SCL

SDA

GPIO

GPIO

MDIO

MDC

SCL

SDA

MDIO

MDC

Rpu

Rpu

SW

SW

SW

SW

SW

SW

SW

SW

Vcc

Figure 8-4. Multi-Voltage Translation with the LSF010x

8.2.3 Single Supply Translation

Sometimes, an external device will have an unknown voltage that could be above or below the desired

translation voltage, preventing a normal connection of the LSF. Resistors are added on the A side in place

of the second supply in this case – this is an example of when LSF single supply operation is utilized, shown in

Figure 9-5. In the following figure, a single 3.3V supply is used to translate between a 3.3V device and a device

that can change between 1.8V and 5.0V. R1 and R2 are added in place of the second supply. Note that due to

some current coming out of the Vref_A pin, this cannot be treated as a simple voltage divider.

LSF0102

SDLS972B – APRIL 2023 – REVISED APRIL 2024

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