AN726 データシートの表示（PDF） - Silicon Laboratories
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AN726 Datasheet PDF : 28 Pages
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AN726
Table 1. Class-D ToolStick Switches and LEDs (Continued)
GPIO Pin
PB0.5
Switch or LED
Blue LED (DS4)
PB0.10
PB0.11
PB3.3
—
Blue LED (DS5)
Blue LED (DS6)
Red LED (DS8)
Green POWER LED (DS7)
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.
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–
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.
6
Rev. 0.1
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