SW

SW

LSF0102-Q1

8

6

2

7

3

4

5

EN

B1

B2

A2

A1

Vref_A

Vref_B

1

GPIO1

GPIO2

Vref_A = 1.2 V

GPIO3

GPIO3

Vpu3 = 2.5 V

Vpu1 = 3.3 V

Rpu

Rpu

Rpu

200

NŸ

GND

GND

GND

VB_Pullup = 3.3 V

10

LSF0102-Q1

SDLS969 – MAY 2018

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Product Folder Links: LSF0102-Q1

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Copyright © 2018, Texas Instruments Incorporated

8.4 Device Functional Modes

When the An or Bn port is LOW, the switch is in the ON-state and a low resistance connection exists between

and signal distortion. Assuming the higher voltage is on the Bn port when the Bn port is HIGH, the voltage on the

An port is limited to the voltage set by Vref_A. When the An port is HIGH, the Bn port is pulled to the drain pull-

and lower voltages selected by the user without the need for direction control. For additional details on the

functional operation of the LSF0102-Q1, see the Down Translation with the LSF Family and Up Translation with

the LSF Family videos.

9 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

9.1 Application Information

SPI, UART, MDIO, SDIO, and GPIO.

9.2 Typical Application

9.2.1 Bidirectional Translation

Figure 7. Bidirectional Translation to Multiple Voltage Levels

9.2.1.1 Design Requirements

9.2.1.1.1

Enable, Disable, and Reference Voltage Guidelines

The LSF0102-Q1 device has an EN input that is used to disable the device by setting EN LOW, which places all

I/Os in the high-impedance state. Since LSF family is switch-type voltage translator, the power consumption is

very low. It is recommended to always enable LSF0102-Q1 device for bidirectional applications by connecting

the EN pin to the Vref_B pin, as shown in Figure 7. For additional details on setting up the Vref_A, Vref_B, and

EN pins, see the Understanding the Bias Circuit for the LSF Family video.