EESchema Schematic File Version 4
EELAYER 30 0
EELAYER END
$Descr A4 11693 8268
encoding utf-8
Sheet 5 5
Title "Black Pill uSDX"
Date "2020-08-25"
Rev "2.0.3"
Comp ""
Comment1 ""
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
Text HLabel 3150 2700 2    50   Input ~ 0
UART_RX
Text HLabel 3150 2800 2    50   Output ~ 0
UART_TX
Text HLabel 1550 5750 0    50   Input ~ 0
AUDIO_L
Text HLabel 1550 5850 0    50   Input ~ 0
AUDIO_R
Text HLabel 3750 6200 3    50   Output ~ 0
MIC
$Comp
L Device:C C519
U 1 1 5F5E1B0C
P 9950 5450
F 0 "C519" H 10065 5496 50  0000 L CNN
F 1 "1u" H 10065 5405 50  0000 L CNN
F 2 "Capacitors_SMD:C_0805" H 9988 5300 50  0001 C CNN
F 3 "~" H 9950 5450 50  0001 C CNN
	1    9950 5450
	1    0    0    -1  
$EndComp
$Comp
L Device:C C520
U 1 1 5F5E2176
P 10350 5350
F 0 "C520" H 10465 5396 50  0000 L CNN
F 1 "100n" H 10465 5305 50  0000 L CNN
F 2 "Capacitors_SMD:C_0805" H 10388 5200 50  0001 C CNN
F 3 "~" H 10350 5350 50  0001 C CNN
	1    10350 5350
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0538
U 1 1 5F5E2BAE
P 10200 5650
F 0 "#PWR0538" H 10200 5400 50  0001 C CNN
F 1 "GND" H 10205 5477 50  0000 C CNN
F 2 "" H 10200 5650 50  0001 C CNN
F 3 "" H 10200 5650 50  0001 C CNN
	1    10200 5650
	1    0    0    -1  
$EndComp
Wire Wire Line
	9950 5600 10200 5600
Wire Wire Line
	10350 5600 10350 5500
Wire Wire Line
	10200 5650 10200 5600
Connection ~ 10200 5600
Wire Wire Line
	10200 5600 10350 5600
$Comp
L power:GND #PWR0527
U 1 1 5F5E79EE
P 6050 4575
F 0 "#PWR0527" H 6050 4325 50  0001 C CNN
F 1 "GND" H 6055 4402 50  0000 C CNN
F 2 "" H 6050 4575 50  0001 C CNN
F 3 "" H 6050 4575 50  0001 C CNN
	1    6050 4575
	1    0    0    -1  
$EndComp
$Comp
L uSDX:USB2422 U503
U 1 1 5F5E1447
P 8000 3800
F 0 "U503" H 7950 3965 50  0000 C CNN
F 1 "USB2422" H 7950 3874 50  0000 C CNN
F 2 "Housings_DFN_QFN:QFN-24-1EP_4x4mm_Pitch0.5mm" H 8000 3800 50  0001 C CNN
F 3 "" H 8000 3800 50  0001 C CNN
	1    8000 3800
	1    0    0    -1  
$EndComp
$Comp
L Device:R_US R508
U 1 1 5F5E89CC
P 7000 5100
F 0 "R508" V 7205 5100 50  0000 C CNN
F 1 "10k" V 7114 5100 50  0000 C CNN
F 2 "Resistors_SMD:R_0805" V 7040 5090 50  0001 C CNN
F 3 "~" H 7000 5100 50  0001 C CNN
	1    7000 5100
	0    -1   -1   0   
$EndComp
$Comp
L Device:R_US R506
U 1 1 5F5E929D
P 7000 4500
F 0 "R506" V 6795 4500 50  0000 C CNN
F 1 "10k" V 6886 4500 50  0000 C CNN
F 2 "Resistors_SMD:R_0805" V 7040 4490 50  0001 C CNN
F 3 "~" H 7000 4500 50  0001 C CNN
	1    7000 4500
	0    1    1    0   
$EndComp
$Comp
L Device:R_US R507
U 1 1 5F5E9E3B
P 7000 4800
F 0 "R507" V 6795 4800 50  0000 C CNN
F 1 "10k" V 6886 4800 50  0000 C CNN
F 2 "Resistors_SMD:R_0805" V 7040 4790 50  0001 C CNN
F 3 "~" H 7000 4800 50  0001 C CNN
	1    7000 4800
	0    1    1    0   
$EndComp
Wire Wire Line
	7150 4500 7250 4500
Wire Wire Line
	7250 4500 7250 4600
Wire Wire Line
	7250 4600 7300 4600
Wire Wire Line
	7300 4800 7150 4800
Wire Wire Line
	7150 5100 7150 4900
Wire Wire Line
	7150 4900 7300 4900
$Comp
L power:GND #PWR0529
U 1 1 5F5EE6A5
P 6850 4800
F 0 "#PWR0529" H 6850 4550 50  0001 C CNN
F 1 "GND" V 6855 4672 50  0000 R CNN
F 2 "" H 6850 4800 50  0001 C CNN
F 3 "" H 6850 4800 50  0001 C CNN
	1    6850 4800
	0    1    1    0   
$EndComp
$Comp
L power:GND #PWR0528
U 1 1 5F5EEA13
P 6850 4500
F 0 "#PWR0528" H 6850 4250 50  0001 C CNN
F 1 "GND" V 6855 4372 50  0000 R CNN
F 2 "" H 6850 4500 50  0001 C CNN
F 3 "" H 6850 4500 50  0001 C CNN
	1    6850 4500
	0    1    1    0   
$EndComp
$Comp
L Device:R_US R505
U 1 1 5F5EEE40
P 6900 3900
F 0 "R505" V 6695 3900 50  0000 C CNN
F 1 "100k" V 6786 3900 50  0000 C CNN
F 2 "Resistors_SMD:R_0805" V 6940 3890 50  0001 C CNN
F 3 "~" H 6900 3900 50  0001 C CNN
	1    6900 3900
	0    1    1    0   
$EndComp
$Comp
L Device:R_US R509
U 1 1 5F5EF5DC
P 7150 3750
F 0 "R509" H 7082 3704 50  0000 R CNN
F 1 "100k" H 7082 3795 50  0000 R CNN
F 2 "Resistors_SMD:R_0805" V 7190 3740 50  0001 C CNN
F 3 "~" H 7150 3750 50  0001 C CNN
	1    7150 3750
	-1   0    0    1   
$EndComp
Wire Wire Line
	7150 3900 7150 4000
Wire Wire Line
	7150 4000 7300 4000
Connection ~ 7150 3900
$Comp
L power:GND #PWR0532
U 1 1 5F5F05F7
P 7150 3600
F 0 "#PWR0532" H 7150 3350 50  0001 C CNN
F 1 "GND" H 7155 3427 50  0000 C CNN
F 2 "" H 7150 3600 50  0001 C CNN
F 3 "" H 7150 3600 50  0001 C CNN
	1    7150 3600
	-1   0    0    1   
$EndComp
$Comp
L Device:Crystal Y502
U 1 1 5F5F0F5A
P 6950 5400
F 0 "Y502" V 6904 5531 50  0000 L CNN
F 1 "24MHz" V 6995 5531 50  0000 L CNN
F 2 "Crystals:Crystal_SMD_Abracon_ABM3-2pin_5.0x3.2mm" H 6950 5400 50  0001 C CNN
F 3 "~" H 6950 5400 50  0001 C CNN
	1    6950 5400
	0    1    1    0   
$EndComp
Wire Wire Line
	7300 5200 6950 5200
Wire Wire Line
	6950 5200 6950 5250
Wire Wire Line
	7300 5300 7300 5550
Wire Wire Line
	7300 5550 7100 5550
$Comp
L Device:C C516
U 1 1 5F5F2FE9
P 7100 5700
F 0 "C516" H 6985 5654 50  0000 R CNN
F 1 "10p" H 6985 5745 50  0000 R CNN
F 2 "Capacitors_SMD:C_0805" H 7138 5550 50  0001 C CNN
F 3 "~" H 7100 5700 50  0001 C CNN
	1    7100 5700
	-1   0    0    1   
$EndComp
Connection ~ 7100 5550
Wire Wire Line
	7100 5550 6950 5550
$Comp
L Device:C C515
U 1 1 5F5F490C
P 6650 5700
F 0 "C515" H 6535 5654 50  0000 R CNN
F 1 "10p" H 6535 5745 50  0000 R CNN
F 2 "Capacitors_SMD:C_0805" H 6688 5550 50  0001 C CNN
F 3 "~" H 6650 5700 50  0001 C CNN
	1    6650 5700
	-1   0    0    1   
$EndComp
Wire Wire Line
	6650 5550 6650 5200
Wire Wire Line
	6650 5200 6950 5200
Connection ~ 6950 5200
$Comp
L power:GND #PWR0531
U 1 1 5F5F7100
P 6900 5850
F 0 "#PWR0531" H 6900 5600 50  0001 C CNN
F 1 "GND" H 6905 5677 50  0000 C CNN
F 2 "" H 6900 5850 50  0001 C CNN
F 3 "" H 6900 5850 50  0001 C CNN
	1    6900 5850
	1    0    0    -1  
$EndComp
Wire Wire Line
	6650 5850 6900 5850
Connection ~ 6900 5850
Wire Wire Line
	6900 5850 7100 5850
$Comp
L Device:R_US R510
U 1 1 5F5F8B20
P 8800 4050
F 0 "R510" H 8732 4004 50  0000 R CNN
F 1 "100k" H 8732 4095 50  0000 R CNN
F 2 "Resistors_SMD:R_0805" V 8840 4040 50  0001 C CNN
F 3 "~" H 8800 4050 50  0001 C CNN
	1    8800 4050
	-1   0    0    1   
$EndComp
$Comp
L power:GND #PWR0533
U 1 1 5F5FC0B7
P 8600 5800
F 0 "#PWR0533" H 8600 5550 50  0001 C CNN
F 1 "GND" H 8605 5627 50  0000 C CNN
F 2 "" H 8600 5800 50  0001 C CNN
F 3 "" H 8600 5800 50  0001 C CNN
	1    8600 5800
	1    0    0    -1  
$EndComp
$Comp
L Device:C C517
U 1 1 5F5FC472
P 9200 5750
F 0 "C517" H 9315 5796 50  0000 L CNN
F 1 "1u" H 9315 5705 50  0000 L CNN
F 2 "Capacitors_SMD:C_0805" H 9238 5600 50  0001 C CNN
F 3 "~" H 9200 5750 50  0001 C CNN
	1    9200 5750
	1    0    0    -1  
$EndComp
Wire Wire Line
	8600 5200 8800 5200
Wire Wire Line
	9950 5300 8800 5300
Wire Wire Line
	8800 5400 8600 5400
Wire Wire Line
	8800 5400 8800 5300
Connection ~ 8800 5300
Wire Wire Line
	8800 5300 8600 5300
Wire Wire Line
	8800 5300 8800 5200
Connection ~ 8800 5200
Wire Wire Line
	8800 5200 10350 5200
$Comp
L Device:R_US R512
U 1 1 5F606033
P 8900 5850
F 0 "R512" H 8832 5804 50  0000 R CNN
F 1 "12k" H 8832 5895 50  0000 R CNN
F 2 "Resistors_SMD:R_0805" V 8940 5840 50  0001 C CNN
F 3 "~" H 8900 5850 50  0001 C CNN
	1    8900 5850
	-1   0    0    1   
$EndComp
Wire Wire Line
	8600 5600 9200 5600
Wire Wire Line
	8900 5700 8600 5700
$Comp
L power:GND #PWR0537
U 1 1 5F609603
P 9200 6050
F 0 "#PWR0537" H 9200 5800 50  0001 C CNN
F 1 "GND" H 9205 5877 50  0000 C CNN
F 2 "" H 9200 6050 50  0001 C CNN
F 3 "" H 9200 6050 50  0001 C CNN
	1    9200 6050
	1    0    0    -1  
$EndComp
Wire Wire Line
	8900 6000 9200 6000
Wire Wire Line
	9200 6050 9200 6000
Connection ~ 9200 6000
Wire Wire Line
	9200 6000 9200 5900
$Comp
L Device:R_US R511
U 1 1 5F60D1C6
P 8800 4650
F 0 "R511" H 8732 4604 50  0000 R CNN
F 1 "100k" H 8732 4695 50  0000 R CNN
F 2 "Resistors_SMD:R_0805" V 8840 4640 50  0001 C CNN
F 3 "~" H 8800 4650 50  0001 C CNN
	1    8800 4650
	-1   0    0    1   
$EndComp
$Comp
L Device:R_US R514
U 1 1 5F60D9F2
P 9050 4750
F 0 "R514" H 8982 4704 50  0000 R CNN
F 1 "100k" H 8982 4795 50  0000 R CNN
F 2 "Resistors_SMD:R_0805" V 9090 4740 50  0001 C CNN
F 3 "~" H 9050 4750 50  0001 C CNN
	1    9050 4750
	-1   0    0    1   
$EndComp
Wire Wire Line
	8800 4500 9050 4500
Wire Wire Line
	9050 4600 9050 4500
Connection ~ 9050 4500
Wire Wire Line
	9050 4500 9100 4500
Wire Wire Line
	9050 4900 8600 4900
Wire Wire Line
	8800 4800 8600 4800
Wire Wire Line
	8600 4200 8800 4200
Wire Wire Line
	8800 3800 8800 3850
Wire Wire Line
	8800 3850 9000 3850
Wire Wire Line
	9000 3850 9000 4000
Connection ~ 8800 3850
Wire Wire Line
	8800 3850 8800 3900
Text Label 8600 4800 0    50   ~ 0
D1+
Text Label 8600 4900 0    50   ~ 0
D1-
Text Label 8600 4200 0    50   ~ 0
D2+
Text Label 8600 4300 0    50   ~ 0
D2-
Wire Wire Line
	9200 6000 9500 6000
Wire Wire Line
	9500 6000 9500 5800
Wire Wire Line
	8600 5500 9500 5500
$Comp
L Device:C C518
U 1 1 5F5FFCF6
P 9500 5650
F 0 "C518" H 9615 5696 50  0000 L CNN
F 1 "100n" H 9615 5605 50  0000 L CNN
F 2 "Capacitors_SMD:C_0805" H 9538 5500 50  0001 C CNN
F 3 "~" H 9500 5650 50  0001 C CNN
	1    9500 5650
	1    0    0    -1  
$EndComp
$Comp
L Interface_USB:MCP2221AxSL U501
U 1 1 5F622234
P 2750 2900
F 0 "U501" H 2750 2211 50  0000 C CNN
F 1 "MCP2221AxSL" H 2750 2120 50  0000 C CNN
F 2 "Housings_SOIC:SOIC-14_3.9x8.7mm_Pitch1.27mm" H 2750 3900 50  0001 C CNN
F 3 "http://ww1.microchip.com/downloads/en/DeviceDoc/20005565B.pdf" H 2750 3600 50  0001 C CNN
	1    2750 2900
	1    0    0    -1  
$EndComp
Text Label 2350 2800 2    50   ~ 0
D1+
Text Label 2350 2900 2    50   ~ 0
D1-
$Comp
L Device:C C507
U 1 1 5F6245D2
P 3100 2150
F 0 "C507" V 2848 2150 50  0000 C CNN
F 1 "100n" V 2939 2150 50  0000 C CNN
F 2 "Capacitors_SMD:C_0805" H 3138 2000 50  0001 C CNN
F 3 "~" H 3100 2150 50  0001 C CNN
	1    3100 2150
	0    1    1    0   
$EndComp
$Comp
L power:GND #PWR0511
U 1 1 5F625E71
P 2750 3500
F 0 "#PWR0511" H 2750 3250 50  0001 C CNN
F 1 "GND" H 2755 3327 50  0000 C CNN
F 2 "" H 2750 3500 50  0001 C CNN
F 3 "" H 2750 3500 50  0001 C CNN
	1    2750 3500
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0513
U 1 1 5F6266D6
P 3250 2150
F 0 "#PWR0513" H 3250 1900 50  0001 C CNN
F 1 "GND" H 3255 1977 50  0000 C CNN
F 2 "" H 3250 2150 50  0001 C CNN
F 3 "" H 3250 2150 50  0001 C CNN
	1    3250 2150
	1    0    0    -1  
$EndComp
Wire Wire Line
	2950 2150 2850 2150
Wire Wire Line
	2750 2150 2750 2200
Wire Wire Line
	2850 2200 2850 2150
Connection ~ 2850 2150
Wire Wire Line
	2850 2150 2750 2150
Wire Wire Line
	2850 2000 2850 2150
$Comp
L uSDX:PCM2903 U502
U 1 1 5F62FD23
P 3000 4450
F 0 "U502" H 3050 4615 50  0000 C CNN
F 1 "PCM2903" H 3050 4524 50  0000 C CNN
F 2 "Housings_SSOP:TSSOP-28_4.4x9.7mm_Pitch0.65mm" H 3000 4450 50  0001 C CNN
F 3 "" H 3000 4450 50  0001 C CNN
	1    3000 4450
	1    0    0    -1  
$EndComp
$Comp
L Device:C C508
U 1 1 5F630F66
P 3750 6050
F 0 "C508" H 3865 6096 50  0000 L CNN
F 1 "10n" H 3865 6005 50  0000 L CNN
F 2 "Capacitors_SMD:C_0805" H 3788 5900 50  0001 C CNN
F 3 "~" H 3750 6050 50  0001 C CNN
	1    3750 6050
	1    0    0    -1  
$EndComp
$Comp
L power:GNDA #PWR0503
U 1 1 5F63422E
P 1600 6600
F 0 "#PWR0503" H 1600 6350 50  0001 C CNN
F 1 "GNDA" H 1605 6427 50  0000 C CNN
F 2 "" H 1600 6600 50  0001 C CNN
F 3 "" H 1600 6600 50  0001 C CNN
	1    1600 6600
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0510
U 1 1 5F634C83
P 2500 5650
F 0 "#PWR0510" H 2500 5400 50  0001 C CNN
F 1 "GND" V 2505 5522 50  0000 R CNN
F 2 "" H 2500 5650 50  0001 C CNN
F 3 "" H 2500 5650 50  0001 C CNN
	1    2500 5650
	0    1    1    0   
$EndComp
$Comp
L power:GND #PWR0516
U 1 1 5F64003E
P 3600 5650
F 0 "#PWR0516" H 3600 5400 50  0001 C CNN
F 1 "GND" V 3605 5522 50  0000 R CNN
F 2 "" H 3600 5650 50  0001 C CNN
F 3 "" H 3600 5650 50  0001 C CNN
	1    3600 5650
	0    -1   -1   0   
$EndComp
Text Label 2500 4750 2    50   ~ 0
D2-
Wire Wire Line
	7050 3900 7150 3900
Text Label 6700 3900 2    50   ~ 0
Vbus
Text Label 2500 5450 2    50   ~ 0
Vbus
$Comp
L Device:R_US R501
U 1 1 5F65584E
P 1450 6200
F 0 "R501" V 1655 6200 50  0000 C CNN
F 1 "1k" V 1564 6200 50  0000 C CNN
F 2 "Resistors_SMD:R_0805" V 1490 6190 50  0001 C CNN
F 3 "~" H 1450 6200 50  0001 C CNN
	1    1450 6200
	0    -1   -1   0   
$EndComp
$Comp
L Device:R_US R502
U 1 1 5F65641C
P 1600 6350
F 0 "R502" H 1532 6304 50  0000 R CNN
F 1 "1k" H 1532 6395 50  0000 R CNN
F 2 "Resistors_SMD:R_0805" V 1640 6340 50  0001 C CNN
F 3 "~" H 1600 6350 50  0001 C CNN
	1    1600 6350
	-1   0    0    1   
$EndComp
$Comp
L Device:C C503
U 1 1 5F65BA3B
P 1950 6400
F 0 "C503" H 2065 6446 50  0000 L CNN
F 1 "10u" H 2065 6355 50  0000 L CNN
F 2 "Capacitors_SMD:C_0805" H 1988 6250 50  0001 C CNN
F 3 "~" H 1950 6400 50  0001 C CNN
	1    1950 6400
	1    0    0    -1  
$EndComp
Wire Wire Line
	1600 6200 1950 6200
Connection ~ 1600 6200
Wire Wire Line
	1950 6250 1950 6200
Wire Wire Line
	1950 6550 1600 6550
Wire Wire Line
	1600 6550 1600 6600
Wire Wire Line
	1600 6500 1600 6550
Connection ~ 1600 6550
$Comp
L Device:C C506
U 1 1 5F66B880
P 2000 5750
F 0 "C506" V 2050 5650 50  0000 C CNN
F 1 "100n" V 1950 5625 50  0000 C CNN
F 2 "Capacitors_SMD:C_0805" H 2038 5600 50  0001 C CNN
F 3 "~" H 2000 5750 50  0001 C CNN
	1    2000 5750
	0    -1   -1   0   
$EndComp
$Comp
L Device:C C502
U 1 1 5F66BDF3
P 1750 5850
F 0 "C502" V 1800 5750 50  0000 C CNN
F 1 "100n" V 1700 5725 50  0000 C CNN
F 2 "Capacitors_SMD:C_0805" H 1788 5700 50  0001 C CNN
F 3 "~" H 1750 5850 50  0001 C CNN
	1    1750 5850
	0    -1   -1   0   
$EndComp
Wire Wire Line
	2150 5750 2500 5750
Wire Wire Line
	1550 5850 1600 5850
Wire Wire Line
	1550 5750 1850 5750
Connection ~ 1950 6200
Wire Wire Line
	1200 6200 1300 6200
Wire Wire Line
	1950 5950 1950 6200
$Comp
L Device:C C510
U 1 1 5F682842
P 4000 5150
F 0 "C510" V 4252 5150 50  0000 C CNN
F 1 "10u" V 4161 5150 50  0000 C CNN
F 2 "Capacitors_SMD:C_0805" H 4038 5000 50  0001 C CNN
F 3 "~" H 4000 5150 50  0001 C CNN
	1    4000 5150
	0    -1   -1   0   
$EndComp
$Comp
L power:GND #PWR0515
U 1 1 5F6837A2
P 3600 5250
F 0 "#PWR0515" H 3600 5000 50  0001 C CNN
F 1 "GND" V 3605 5122 50  0000 R CNN
F 2 "" H 3600 5250 50  0001 C CNN
F 3 "" H 3600 5250 50  0001 C CNN
	1    3600 5250
	0    -1   -1   0   
$EndComp
$Comp
L power:GND #PWR0521
U 1 1 5F687295
P 4150 5150
F 0 "#PWR0521" H 4150 4900 50  0001 C CNN
F 1 "GND" H 4155 4977 50  0000 C CNN
F 2 "" H 4150 5150 50  0001 C CNN
F 3 "" H 4150 5150 50  0001 C CNN
	1    4150 5150
	1    0    0    -1  
$EndComp
$Comp
L Device:C C509
U 1 1 5F68822F
P 4000 4750
F 0 "C509" V 4252 4750 50  0000 C CNN
F 1 "10u" V 4161 4750 50  0000 C CNN
F 2 "Capacitors_SMD:C_0805" H 4038 4600 50  0001 C CNN
F 3 "~" H 4000 4750 50  0001 C CNN
	1    4000 4750
	0    -1   -1   0   
$EndComp
$Comp
L power:GND #PWR0514
U 1 1 5F688239
P 3600 4850
F 0 "#PWR0514" H 3600 4600 50  0001 C CNN
F 1 "GND" V 3605 4722 50  0000 R CNN
F 2 "" H 3600 4850 50  0001 C CNN
F 3 "" H 3600 4850 50  0001 C CNN
	1    3600 4850
	0    -1   -1   0   
$EndComp
$Comp
L power:GND #PWR0520
U 1 1 5F688246
P 4150 4750
F 0 "#PWR0520" H 4150 4500 50  0001 C CNN
F 1 "GND" H 4155 4577 50  0000 C CNN
F 2 "" H 4150 4750 50  0001 C CNN
F 3 "" H 4150 4750 50  0001 C CNN
	1    4150 4750
	1    0    0    -1  
$EndComp
$Comp
L Device:C C511
U 1 1 5F697098
P 4150 6050
F 0 "C511" V 4200 5950 50  0000 C CNN
F 1 "10u" V 4300 6050 50  0000 C CNN
F 2 "Capacitors_SMD:C_0805" H 4188 5900 50  0001 C CNN
F 3 "~" H 4150 6050 50  0001 C CNN
	1    4150 6050
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0523
U 1 1 5F6970A5
P 4150 6200
F 0 "#PWR0523" H 4150 5950 50  0001 C CNN
F 1 "GND" H 4155 6027 50  0000 C CNN
F 2 "" H 4150 6200 50  0001 C CNN
F 3 "" H 4150 6200 50  0001 C CNN
	1    4150 6200
	1    0    0    -1  
$EndComp
$Comp
L Device:C C504
U 1 1 5F6AFA41
P 1800 4850
F 0 "C504" V 2052 4850 50  0000 C CNN
F 1 "10u" V 1961 4850 50  0000 C CNN
F 2 "Capacitors_SMD:C_0805" H 1838 4700 50  0001 C CNN
F 3 "~" H 1800 4850 50  0001 C CNN
	1    1800 4850
	0    1    -1   0   
$EndComp
$Comp
L power:GND #PWR0509
U 1 1 5F6AFA4B
P 2500 4950
F 0 "#PWR0509" H 2500 4700 50  0001 C CNN
F 1 "GND" V 2505 4822 50  0000 R CNN
F 2 "" H 2500 4950 50  0001 C CNN
F 3 "" H 2500 4950 50  0001 C CNN
	1    2500 4950
	0    1    -1   0   
$EndComp
$Comp
L power:GND #PWR0504
U 1 1 5F6AFA58
P 1650 4850
F 0 "#PWR0504" H 1650 4600 50  0001 C CNN
F 1 "GND" H 1655 4677 50  0000 C CNN
F 2 "" H 1650 4850 50  0001 C CNN
F 3 "" H 1650 4850 50  0001 C CNN
	1    1650 4850
	-1   0    0    -1  
$EndComp
$Comp
L power:GND #PWR0502
U 1 1 5F6C0A52
P 1400 5550
F 0 "#PWR0502" H 1400 5300 50  0001 C CNN
F 1 "GND" V 1405 5422 50  0000 R CNN
F 2 "" H 1400 5550 50  0001 C CNN
F 3 "" H 1400 5550 50  0001 C CNN
	1    1400 5550
	0    1    -1   0   
$EndComp
$Comp
L Device:C C505
U 1 1 5F6CA631
P 2000 5300
F 0 "C505" V 2252 5300 50  0000 C CNN
F 1 "10u" V 2161 5300 50  0000 C CNN
F 2 "Capacitors_SMD:C_0805" H 2038 5150 50  0001 C CNN
F 3 "~" H 2000 5300 50  0001 C CNN
	1    2000 5300
	0    1    -1   0   
$EndComp
$Comp
L power:GND #PWR0505
U 1 1 5F6CA63D
P 1850 5300
F 0 "#PWR0505" H 1850 5050 50  0001 C CNN
F 1 "GND" H 1855 5127 50  0000 C CNN
F 2 "" H 1850 5300 50  0001 C CNN
F 3 "" H 1850 5300 50  0001 C CNN
	1    1850 5300
	-1   0    0    -1  
$EndComp
Wire Wire Line
	2400 5300 2400 5350
Wire Wire Line
	2400 5350 2500 5350
$Comp
L Device:C C501
U 1 1 5F6C0A46
P 1550 5550
F 0 "C501" V 1802 5550 50  0000 C CNN
F 1 "10u" V 1711 5550 50  0000 C CNN
F 2 "Capacitors_SMD:C_0805" H 1588 5400 50  0001 C CNN
F 3 "~" H 1550 5550 50  0001 C CNN
	1    1550 5550
	0    1    -1   0   
$EndComp
$Comp
L Connector:USB_B_Micro J501
U 1 1 5F562D59
P 6100 4100
F 0 "J501" H 5870 4089 50  0000 R CNN
F 1 "USB_B_Micro" H 5870 3998 50  0000 R CNN
F 2 "Connectors:USB_Micro-B" H 6250 4050 50  0001 C CNN
F 3 "~" H 6250 4050 50  0001 C CNN
	1    6100 4100
	1    0    0    -1  
$EndComp
Wire Wire Line
	3600 5750 4150 5750
$Comp
L Device:C C512
U 1 1 5F71AC8B
P 4600 6050
F 0 "C512" V 4650 5950 50  0000 C CNN
F 1 "10u" V 4750 6050 50  0000 C CNN
F 2 "Capacitors_SMD:C_0805" H 4638 5900 50  0001 C CNN
F 3 "~" H 4600 6050 50  0001 C CNN
	1    4600 6050
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0525
U 1 1 5F71AC95
P 4600 6200
F 0 "#PWR0525" H 4600 5950 50  0001 C CNN
F 1 "GND" H 4605 6027 50  0000 C CNN
F 2 "" H 4600 6200 50  0001 C CNN
F 3 "" H 4600 6200 50  0001 C CNN
	1    4600 6200
	1    0    0    -1  
$EndComp
Wire Wire Line
	3600 5550 4600 5550
Wire Wire Line
	4150 5750 4150 5900
Wire Wire Line
	4600 5550 4600 5900
Wire Wire Line
	3750 5850 3750 5900
$Comp
L Device:Crystal Y501
U 1 1 5F7414CD
P 5000 5300
F 0 "Y501" V 4954 5431 50  0000 L CNN
F 1 "12MHz" V 5045 5431 50  0000 L CNN
F 2 "Crystals:Crystal_SMD_Abracon_ABM3-2pin_5.0x3.2mm" H 5000 5300 50  0001 C CNN
F 3 "~" H 5000 5300 50  0001 C CNN
	1    5000 5300
	0    1    1    0   
$EndComp
Wire Wire Line
	3600 5450 4650 5450
Wire Wire Line
	5000 5150 4650 5150
Wire Wire Line
	4550 5150 4550 5350
Wire Wire Line
	4550 5350 3600 5350
$Comp
L Device:R_US R504
U 1 1 5F74ED43
P 4650 5300
F 0 "R504" H 4582 5254 50  0000 R CNN
F 1 "1M" H 4582 5345 50  0000 R CNN
F 2 "Resistors_SMD:R_0805" V 4690 5290 50  0001 C CNN
F 3 "~" H 4650 5300 50  0001 C CNN
	1    4650 5300
	-1   0    0    1   
$EndComp
Connection ~ 4650 5450
Wire Wire Line
	4650 5450 5000 5450
Connection ~ 4650 5150
Wire Wire Line
	4650 5150 4550 5150
$Comp
L Device:C C514
U 1 1 5F752D8B
P 5200 5550
F 0 "C514" V 5250 5450 50  0000 C CNN
F 1 "10p" V 5350 5550 50  0000 C CNN
F 2 "Capacitors_SMD:C_0805" H 5238 5400 50  0001 C CNN
F 3 "~" H 5200 5550 50  0001 C CNN
	1    5200 5550
	0    1    1    0   
$EndComp
$Comp
L Device:C C513
U 1 1 5F753575
P 5200 5000
F 0 "C513" V 5250 4900 50  0000 C CNN
F 1 "10p" V 5350 5000 50  0000 C CNN
F 2 "Capacitors_SMD:C_0805" H 5238 4850 50  0001 C CNN
F 3 "~" H 5200 5000 50  0001 C CNN
	1    5200 5000
	0    1    1    0   
$EndComp
Wire Wire Line
	5050 5000 5000 5000
Wire Wire Line
	5000 5000 5000 5150
Connection ~ 5000 5150
Wire Wire Line
	5000 5450 5000 5550
Wire Wire Line
	5000 5550 5050 5550
Connection ~ 5000 5450
$Comp
L power:GND #PWR0526
U 1 1 5F75AE81
P 5450 5600
F 0 "#PWR0526" H 5450 5350 50  0001 C CNN
F 1 "GND" H 5455 5427 50  0000 C CNN
F 2 "" H 5450 5600 50  0001 C CNN
F 3 "" H 5450 5600 50  0001 C CNN
	1    5450 5600
	1    0    0    -1  
$EndComp
Wire Wire Line
	5350 5000 5450 5000
Wire Wire Line
	5450 5000 5450 5550
Wire Wire Line
	5350 5550 5450 5550
Connection ~ 5450 5550
Wire Wire Line
	5450 5550 5450 5600
$Comp
L Device:R_US R503
U 1 1 5F76B834
P 3950 4350
F 0 "R503" V 3745 4350 50  0000 C CNN
F 1 "100k" V 3836 4350 50  0000 C CNN
F 2 "Resistors_SMD:R_0805" V 3990 4340 50  0001 C CNN
F 3 "~" H 3950 4350 50  0001 C CNN
	1    3950 4350
	0    1    1    0   
$EndComp
Wire Wire Line
	3800 4350 3600 4350
Wire Wire Line
	3600 4350 3600 4650
Wire Wire Line
	4100 4350 4150 4350
Text Notes 3600 6200 2    50   ~ 0
Input impedance: 30k Ohms\nOutput impedance: 10k Ohms
Wire Wire Line
	8600 4300 9000 4300
$Comp
L Device:R_US R513
U 1 1 5F60CC78
P 9000 4150
F 0 "R513" H 8932 4104 50  0000 R CNN
F 1 "100k" H 8932 4195 50  0000 R CNN
F 2 "Resistors_SMD:R_0805" V 9040 4140 50  0001 C CNN
F 3 "~" H 9000 4150 50  0001 C CNN
	1    9000 4150
	-1   0    0    1   
$EndComp
Wire Wire Line
	3600 5850 3750 5850
Wire Wire Line
	6000 4500 6050 4500
Wire Wire Line
	6050 4500 6050 4575
Connection ~ 6050 4500
Wire Wire Line
	6050 4500 6100 4500
$Comp
L power:+3.3V #PWR0530
U 1 1 5FA9F1C7
P 6850 5100
F 0 "#PWR0530" H 6850 4950 50  0001 C CNN
F 1 "+3.3V" V 6865 5228 50  0000 L CNN
F 2 "" H 6850 5100 50  0001 C CNN
F 3 "" H 6850 5100 50  0001 C CNN
	1    6850 5100
	0    -1   -1   0   
$EndComp
$Comp
L power:+3.3V #PWR0535
U 1 1 5FA9FA38
P 8800 5200
F 0 "#PWR0535" H 8800 5050 50  0001 C CNN
F 1 "+3.3V" H 8815 5373 50  0000 C CNN
F 2 "" H 8800 5200 50  0001 C CNN
F 3 "" H 8800 5200 50  0001 C CNN
	1    8800 5200
	1    0    0    -1  
$EndComp
$Comp
L power:+3.3V #PWR0536
U 1 1 5FA9FC25
P 9100 4500
F 0 "#PWR0536" H 9100 4350 50  0001 C CNN
F 1 "+3.3V" V 9115 4628 50  0000 L CNN
F 2 "" H 9100 4500 50  0001 C CNN
F 3 "" H 9100 4500 50  0001 C CNN
	1    9100 4500
	0    1    1    0   
$EndComp
$Comp
L power:+3.3V #PWR0534
U 1 1 5FAA00CB
P 8800 3800
F 0 "#PWR0534" H 8800 3650 50  0001 C CNN
F 1 "+3.3V" H 8815 3973 50  0000 C CNN
F 2 "" H 8800 3800 50  0001 C CNN
F 3 "" H 8800 3800 50  0001 C CNN
	1    8800 3800
	1    0    0    -1  
$EndComp
$Comp
L power:+3.3V #PWR0512
U 1 1 5FAA1469
P 2850 2000
F 0 "#PWR0512" H 2850 1850 50  0001 C CNN
F 1 "+3.3V" H 2865 2173 50  0000 C CNN
F 2 "" H 2850 2000 50  0001 C CNN
F 3 "" H 2850 2000 50  0001 C CNN
	1    2850 2000
	1    0    0    -1  
$EndComp
$Comp
L power:+3.3V #PWR0517
U 1 1 5FAA2563
P 3750 4750
F 0 "#PWR0517" H 3750 4600 50  0001 C CNN
F 1 "+3.3V" H 3765 4923 50  0000 C CNN
F 2 "" H 3750 4750 50  0001 C CNN
F 3 "" H 3750 4750 50  0001 C CNN
	1    3750 4750
	1    0    0    -1  
$EndComp
Wire Wire Line
	3600 4750 3750 4750
Wire Wire Line
	3600 5150 3750 5150
Connection ~ 3750 4750
Wire Wire Line
	3750 4750 3850 4750
$Comp
L power:+3.3V #PWR0518
U 1 1 5FAA2F9A
P 3750 5150
F 0 "#PWR0518" H 3750 5000 50  0001 C CNN
F 1 "+3.3V" H 3765 5323 50  0000 C CNN
F 2 "" H 3750 5150 50  0001 C CNN
F 3 "" H 3750 5150 50  0001 C CNN
	1    3750 5150
	1    0    0    -1  
$EndComp
Connection ~ 3750 5150
Wire Wire Line
	3750 5150 3850 5150
$Comp
L power:+3.3V #PWR0501
U 1 1 5FAA408B
P 1200 6200
F 0 "#PWR0501" H 1200 6050 50  0001 C CNN
F 1 "+3.3V" H 1215 6373 50  0000 C CNN
F 2 "" H 1200 6200 50  0001 C CNN
F 3 "" H 1200 6200 50  0001 C CNN
	1    1200 6200
	1    0    0    -1  
$EndComp
$Comp
L power:+3.3V #PWR0522
U 1 1 5FAA4ADD
P 4150 5750
F 0 "#PWR0522" H 4150 5600 50  0001 C CNN
F 1 "+3.3V" V 4165 5878 50  0000 L CNN
F 2 "" H 4150 5750 50  0001 C CNN
F 3 "" H 4150 5750 50  0001 C CNN
	1    4150 5750
	0    1    1    0   
$EndComp
Connection ~ 4150 5750
Wire Wire Line
	1950 4850 2000 4850
Wire Wire Line
	2150 5300 2200 5300
$Comp
L power:+3.3V #PWR0506
U 1 1 5FAA57FD
P 2000 4850
F 0 "#PWR0506" H 2000 4700 50  0001 C CNN
F 1 "+3.3V" H 2015 5023 50  0000 C CNN
F 2 "" H 2000 4850 50  0001 C CNN
F 3 "" H 2000 4850 50  0001 C CNN
	1    2000 4850
	1    0    0    -1  
$EndComp
Connection ~ 2000 4850
$Comp
L power:+3.3V #PWR0507
U 1 1 5FAA5C5A
P 2200 5300
F 0 "#PWR0507" H 2200 5150 50  0001 C CNN
F 1 "+3.3V" H 2215 5473 50  0000 C CNN
F 2 "" H 2200 5300 50  0001 C CNN
F 3 "" H 2200 5300 50  0001 C CNN
	1    2200 5300
	1    0    0    -1  
$EndComp
Connection ~ 2200 5300
Wire Wire Line
	2200 5300 2400 5300
Wire Wire Line
	1700 5550 2200 5550
$Comp
L power:+3.3V #PWR0508
U 1 1 5FAA5F6E
P 2200 5550
F 0 "#PWR0508" H 2200 5400 50  0001 C CNN
F 1 "+3.3V" H 2215 5723 50  0000 C CNN
F 2 "" H 2200 5550 50  0001 C CNN
F 3 "" H 2200 5550 50  0001 C CNN
	1    2200 5550
	1    0    0    -1  
$EndComp
Connection ~ 2200 5550
Wire Wire Line
	2200 5550 2500 5550
$Comp
L power:+3.3V #PWR0524
U 1 1 5FAA686A
P 4600 5550
F 0 "#PWR0524" H 4600 5400 50  0001 C CNN
F 1 "+3.3V" V 4615 5678 50  0000 L CNN
F 2 "" H 4600 5550 50  0001 C CNN
F 3 "" H 4600 5550 50  0001 C CNN
	1    4600 5550
	0    1    1    0   
$EndComp
Connection ~ 4600 5550
$Comp
L power:+3.3V #PWR0519
U 1 1 5FAA6B86
P 4150 4350
F 0 "#PWR0519" H 4150 4200 50  0001 C CNN
F 1 "+3.3V" H 4165 4523 50  0000 C CNN
F 2 "" H 4150 4350 50  0001 C CNN
F 3 "" H 4150 4350 50  0001 C CNN
	1    4150 4350
	1    0    0    -1  
$EndComp
NoConn ~ 6400 4300
NoConn ~ 8600 4000
NoConn ~ 8600 4100
NoConn ~ 8600 4600
NoConn ~ 8600 4700
NoConn ~ 2500 5050
NoConn ~ 2500 5150
NoConn ~ 2500 5250
NoConn ~ 3150 3000
NoConn ~ 3150 3100
NoConn ~ 3150 3200
NoConn ~ 3150 3300
NoConn ~ 3150 2500
NoConn ~ 3150 2400
NoConn ~ 2350 2400
NoConn ~ 3600 5950
NoConn ~ 3600 5050
NoConn ~ 3600 4950
NoConn ~ 7300 4700
Wire Wire Line
	6400 3900 6750 3900
Wire Wire Line
	6400 4100 7300 4100
Wire Wire Line
	6400 4200 7300 4200
Wire Wire Line
	1900 5850 2500 5850
Wire Wire Line
	1950 5950 2500 5950
Text Label 2500 4650 2    50   ~ 0
D2+
Wire Wire Line
	2000 4850 2500 4850
$EndSCHEMATC