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

4.5. Capacitive Sensing Buttons and Slider (CS1)

Four capacitive sensing buttons and one slider comprised of six segments are included on the board to provide the

user interface. Six GPIO pins are connected to the slider as shown in Table 3. The GPIO pins are connected to the

slider in descending order from the location labeled MODE to the location labeled PLAY on the board.

The test points above the slider facilitate adding grounded or shrouded connectors to measure the capacitive

sensing pins.

Table 3. Capacitive Sensing GPIO Connections

Location

MODE

—

Pin

PB1.1

PB1.0

ERASE

—

REC

PLAY

PB0.15

PB0.14

PB0.13

PB0.12

4.6. Analog Audio Inputs (J1 and MK1)

The stereo jack on the board (J1) allows the board to measure stereo inputs from an input source. The microphone

(MK1) enables the device to measure voice data directly. These signals are conditioned by a bias and gain circuit

provided by a quad op-amp IC (U1), resistors, and capacitors to a range appropriate for the SiM3U164 SARADC

modules.

Rev. 0.1

7

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