Q: I'll be using your Level Shifter Board to connect the Beagle I2C/SPI Protocol Analyzer to a 1.8V  MCU on an SPI bus. I have two questions:

• Do I need to connect the TPWR jumper on the Level Shifter?
• Do I need to wire Target Power to the Target connector?

A: Thanks for your questions! The Beagle I2C/SPI Protocol Analyzer operates at 3.3V signal levels.  The Level Shifter board supports the voltage levels of 1.2V, 1.5V, 2.5V, 3.0V and 3.3V, and can provide power to downstream devices. Using the Level Shifter board between the Beagle analyzer and the MCU will provide the correct signal levels to both the Beagle analyzer and the target device.

Figure 1: Level Shifter Board

For your question, the following steps will configure the Level Shifter to interface the Beagle I2C/SPI Protocol Analyzer to your 1.8V MCU on an SPI bus. In addition to the Level Shifter Board and Beagle analyzer, you will be using a Total Phase software tool, either Data Center Software or Beagle Software API. The software tools are free.

1. Remove all the jumpers from the Level Shifter board.
2. Connect the Beagle I2C/SPI Protocol Analyzer connector to the Level Shifter board ADAPTER connector.
3. Connect  the 1.8V SPI target device SPI connector to the Level Shifter board TARGET1 connector.
4. Enable the target power with the Total Phase software tool, either Data Center Software or Beagle Software API.

   • The adapter side must be powered with 5V.
   • Target power control in the Total Phase tool enables supplying 5V to the board through the +5V pins in the ADAPTER connector.

5. Ensure the green Power led is on.
6. Install a jumper for 1.8V.
7. Install  a jumper for MONITOR.
8. Install a jumper for TPWR.
9. Make sure the amber Target led is on—this indicates the Target Device is powered with 1.8V by the Level Shifter board.

For additional information about configuring the Level Shifter board, such as controlling the direction of SPI level shifting logic, please refer to Chapter 4 of the  Level Shifter Board Manual.

For more information about our products, you can refer to:

Level Shifter Board

Protocol Analyzer

Beagle I2C/SPI drivers and API

Data Center

Total Phase Products

Product Selector Guide

We hope this answers your question. If you have other questions about our Host Adapters or other Total Phase products, feel free to email us at sales@totalphase.com or support@totalphase.com.