Silicon Laboratories SiM3U1xx Manual do Utilizador descarregar pdf (Página 6)

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6 Rev. 0.1

4.2. Class-D Output Network, Terminal (J4), Header (JP1), and Jack (J5)

The four high drive I/O pins on the SiM3U164 40-pin QFN package connect to the J4 terminals after going through

the Class-D output network, allowing these pins to directly drive the speaker(s). The JP1 1x2 header connects to

R+ and R– to interface with the kit speaker. The output jack (J5) connects R+ and R– to both channels and does

not provide true mono sound. To create a mono output, connect the L_IN and R_IN test points together in the

stereo jack and microphone gain/bias section of the board.

The output network consists of a ferrite bead, LC, and grounding caps for each pair of channels, R+/R– and L+/L–.

These components should be tuned for the specific application speaker as discussed in 6. "Tuning the Class-D

Output Network‚" on page 18.

4.3. ToolStick Debug Adapter (U3)

The Class-D ToolStick board features a debug adapter via the mini-B USB connector (J3) labeled DEBUG. This

debug adapter can be used with the Precision32 (1.0.2 and higher) and ARM uVision IDEs (4.54 and higher).

When using an older version of the IDEs, the debug adapter DLLs in the IDE directories must be replaced to

support the ToolStick Debug Adapter. Contact technical support (“Contact Information” section) for more

information.

4.4. USB Connection Options (J2)

The Class-D ToolStick board features a USB connection via the mini-B USB connector (J2) labeled DEVICE. This

USB connector provides the USB Audio features of the board and facilitates general-purpose USB development on

the SiM3U164 device.

PB0.5 Blue LED (DS4)

PB0.10 Blue LED (DS5)

PB0.11 Blue LED (DS6)

PB3.3 Red LED (DS8)

— Green POWER LED (DS7)

Table 2. Terminal Block Pin Descriptions (J4)

Pin I/O

1 PB4.0 / R+

2 PB4.1 / R–

3 PB4.2 / L+

4 PB4.3 / L–

Table 1. Class-D ToolStick Switches and LEDs (Continued)

GPIO Pin Switch or LED

1 2 3 4 5 6 7 8 9 10 11 ... 27 28

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