AN726 データシートの表示（PDF） - Silicon Laboratories

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AN726

UTILITY CLASS-D TOOLSTICK USER’S GUIDE

Silicon Laboratories 

AN726

4. Class-D ToolStick Hardware Overview

The Class-D ToolStick board enables Class-D application development on the SiM3U164 MCU. In addition to

providing a development platform for Class-D applications, the Class-D ToolStick board serves as a low-cost,

general-purpose development platform for the SiM3U1xx USB MCUs.

Figure 5 shows the Utility Class-D ToolStick board features. Full schematics for the board can be found in

7. "Schematics‚" on page 22

ToolStick Debug

Adapter

Testpoint Pin Access

for General-Purpose

Development

Optional High

Power Components

Audio Inputs

Class-D Output

Filters and

Speaker Header

Stereo Jack and

Microphone Gain/Bias

Capacitive Sensing

Slider and LED User

Interface

Figure 5. Utility Class-D ToolStick Board Features

4.1. Push-Button Switches and LEDs (S1-2, DS1-DS8)

The Class-D ToolStick board has two push-button switches and eight LEDs summarized in Table 1. The switches

connect to PB0.6 (S1) and PB0.7 (S2) and are currently unused in the Class-D firmware. The switches are

normally open and pull the pin voltage to ground when pressed.

Port pins PB0.1, PB0.2, PB0.4, PB0.5, PB0.10, and PB0.11 connect to six blue LEDs (DS1-DS6). Pin PB3.3

connects to the red LED (DS8). The green LED, POWER (DS7), turns on when USB power is applied to the board

from either USB connector. The LEDs connect to VIO through a current limiting resistor.

Table 1. Class-D ToolStick Switches and LEDs

GPIO Pin

PB0.6

PB0.7

PB0.1

PB0.2

PB0.4

Switch or LED

Push-Button Switch (S1)

Push-Button Switch (S2)

Blue LED (DS1)

Blue LED (DS2)

Blue LED (DS3)

Rev. 0.1

5

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