CAPTIVATE-ISO

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The CAPTIVATE-ISO is available if you need to isolate the programming and communication signals between the target MCU and a connected PC.

This chapter of the CapTIvate Technology Guide contains the following sections:

  1. Overview

  2. Hardware

  3. Schematics

  4. Layout

To order a CAPTIVATE-ISO, visit the tool folder.

Overview

The CAPTIVATE-ISO PCB provides isolated UART, I2C, IRQ, and Spy-by-Wire signals as well as isolated GND and +3.3V power planes. This may be required when developing battery powered applications or performing conducted noise testing. For additional information about noise immunity, refer to the conducted noise testing chapter.

CAPTIVATE-ISO PCB

Fig. 339 CAPTIVATE-ISO PCB

Key Features

The CAPTIVATE-ISO has the following key features:

  • Provides galvanic isolation for SBW programming/debug, I2C and UART communications

    • TI low power digital isolators

      • ISO1541 for Spy-by-Wire

      • ISO7131 for UART

      • ISO1540 for I2C

    • No shared power or grounds

  • Use when performing

    • Tuning battery powered applications

    • Conducted noise testing

What’s Included

  • 1 CAPTIVATE-ISO isolation board

Block Diagram

The functional block diagram for the CAPTIVATE-ISO is shown below.

Block Diagram

Fig. 340 Block Diagram

Hardware

The CAPTIVATE-ISO PCB provides isolated Spy-Bi-Wire programming and debugging. Due to the added delays in the SBW timing,, it is recommended to use the default medium JTAG/SBW speed or slower. JTAG/SBW speed = FAST is not supported at this time.

Typical Isolated Setup

The diagram below illustrates a typical setup using an isolated power supply or battery to power the CAPTIVATE-FR2633 MCU target PCB.

Typical Setup

Fig. 341 Typical Setup

Minimum Operating Voltages

Isolator

Min Operating VCC

TI ISO1540

3.0

TI ISO1541

3.0

TI ISO7131

2.7

Important: To guarantee proper operation, power the “Target” side of the CAPTIVATE-ISO PCB with an external power source that meets the VCC minimum operating voltages shown in the table below. These values are provided for convenience only. Please consult the isolator’s device’s datasheet for additional information. The maximum “Target” side voltage should not exceed the MSP430FR2633 VCC maximum operating voltage 3.6 VDC.

Schematics

CAPTIVATE- Schematic

Fig. 342 CAPTIVATE- Schematic

Layout

CAPTIVATE-ISO Top Layer

Fig. 343 CAPTIVATE-ISO Top Layer

CAPTIVATE-ISO Bottom Layer

Fig. 344 CAPTIVATE-ISO Bottom Layer