FreeCalypso > hg > freecalypso-schem2

annotate venus/src/periph/loudspeaker.v @ 83:c27854430cb3

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add 3-pin header for possible external boot control
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 08 Dec 2021 05:32:47 +0000
parents 66d99b5be8a3
children
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59
66d99b5be8a3 loudspeaker block implemented
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1 /* Loudspeaker circuit following Leonardo schematics */
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2
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3 module loudspeaker (GND, VBAT, Input_pos, Input_neg, GPIO_enable);
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4
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5 input GND, VBAT;
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6 input Input_pos, Input_neg;
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7 input GPIO_enable;
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8
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9 wire PA_in_pos, PA_in_neg;
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10 wire Out_pos, Out_neg;
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11 wire BYPASS;
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12
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13 /* instantiate the audio PA */
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14 pkg_TPA6203A1 apa (.BYPASS(BYPASS),
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15 .GND(GND),
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16 .In_neg(PA_in_neg),
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17 .In_pos(PA_in_pos),
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18 .SHUTDOWN(GPIO_enable),
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19 .VDD(VBAT),
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20 .Out_pos(Out_pos),
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21 .Out_neg(Out_neg)
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22 );
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23
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24 /* input resistors: the inversion is per Leonardo schematics */
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25 resistor R33xA (Input_pos, PA_in_neg);
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26 resistor R33xB (Input_neg, PA_in_pos);
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27
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28 /* feedback resistors */
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29 resistor R331 (Out_neg, PA_in_pos);
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30 resistor R332 (Out_pos, PA_in_neg);
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31
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32 /* bypass and supply decoupling caps */
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33 capacitor C319 (BYPASS, GND);
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34 capacitor C330 (VBAT, GND);
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35
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36 /* small output capacitors */
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37 capacitor C331 (Out_neg, GND);
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38 capacitor C332 (Out_pos, GND);
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39
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40 /* the speaker itself! */
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41 header_2pin spkr_connector (Out_pos, Out_neg);
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42
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43 /* pull-down on the GPIO control line */
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44 resistor R338 (GPIO_enable, GND);
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45
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46 endmodule