ESPTiny1614.sch

EESchema Schematic File Version 4
EELAYER 30 0
EELAYER END
$Descr A4 11693 8268
encoding utf-8
Sheet 1 1
Title "ESP01 Attiny1614 board"
Date "2021-09-19"
Rev "2.1"
Comp "http://www.v7f.eu"
Comment1 ""
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
$Comp
L ESP8266:ESP-01v090 U1
U 1 1 60CDAFCF
P 6750 4650
F 0 "U1" H 6750 5165 50  0000 C CNN
F 1 "ESP-01v090" H 6750 5074 50  0000 C CNN
F 2 "ESP8266:ESP-01" H 6750 4650 50  0001 C CNN
F 3 "http://l0l.org.uk/2014/12/esp8266-modules-hardware-guide-gotta-catch-em-all/" H 6750 4650 50  0001 C CNN
	1    6750 4650
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR02
U 1 1 60CDC58A
P 7700 4500
F 0 "#PWR02" H 7700 4250 50  0001 C CNN
F 1 "GND" V 7705 4372 50  0000 R CNN
F 2 "" H 7700 4500 50  0001 C CNN
F 3 "" H 7700 4500 50  0001 C CNN
	1    7700 4500
	0    -1   -1   0   
$EndComp
$Comp
L Connector:Conn_01x10_Male J1
U 1 1 60CDCA2E
P 6700 3450
F 0 "J1" V 6627 3378 50  0000 C CNN
F 1 "Conn_01x10_Male" V 6536 3378 50  0000 C CNN
F 2 "Connector_PinHeader_2.54mm:PinHeader_1x10_P2.54mm_Vertical" H 6700 3450 50  0001 C CNN
F 3 "~" H 6700 3450 50  0001 C CNN
	1    6700 3450
	0    -1   -1   0   
$EndComp
$Comp
L Diode:BAT85 D2
U 1 1 60CE9D54
P 2200 3600
F 0 "D2" V 2154 3680 50  0000 L CNN
F 1 "BAT85" V 2245 3680 50  0000 L CNN
F 2 "Diode_THT:D_DO-35_SOD27_P2.54mm_Vertical_AnodeUp" H 2200 3425 50  0001 C CNN
F 3 "https://assets.nexperia.com/documents/data-sheet/BAT85.pdf" H 2200 3600 50  0001 C CNN
	1    2200 3600
	0    1    1    0   
$EndComp
$Comp
L Device:C C3
U 1 1 60CEAC44
P 2200 1400
F 0 "C3" H 2315 1446 50  0000 L CNN
F 1 "100n" H 2315 1355 50  0000 L CNN
F 2 "Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm" H 2238 1250 50  0001 C CNN
F 3 "~" H 2200 1400 50  0001 C CNN
	1    2200 1400
	1    0    0    -1  
$EndComp
$Comp
L Device:LED D1
U 1 1 60CEC3FD
P 2900 4700
F 0 "D1" V 2939 4582 50  0000 R CNN
F 1 "LED" V 2848 4582 50  0000 R CNN
F 2 "LED_THT:LED_D3.0mm" H 2900 4700 50  0001 C CNN
F 3 "~" H 2900 4700 50  0001 C CNN
	1    2900 4700
	0    -1   -1   0   
$EndComp
$Comp
L Device:R R1
U 1 1 60CEC878
P 2900 4400
F 0 "R1" H 2970 4446 50  0000 L CNN
F 1 "220" H 2970 4355 50  0000 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical" V 2830 4400 50  0001 C CNN
F 3 "~" H 2900 4400 50  0001 C CNN
	1    2900 4400
	1    0    0    -1  
$EndComp
$Comp
L Connector:Conn_01x10_Male J2
U 1 1 60CECE1E
P 6800 2200
F 0 "J2" V 6635 2128 50  0000 C CNN
F 1 "Conn_01x10_Male" V 6726 2128 50  0000 C CNN
F 2 "Connector_PinHeader_2.54mm:PinHeader_1x10_P2.54mm_Vertical" H 6800 2200 50  0001 C CNN
F 3 "~" H 6800 2200 50  0001 C CNN
	1    6800 2200
	0    1    1    0   
$EndComp
$Comp
L Regulator_Linear:MCP1700-3302E_TO92 U3
U 1 1 60CEDF15
P 2050 2900
F 0 "U3" V 2096 2795 50  0000 R CNN
F 1 "MCP1700-3302E_TO92" V 2005 2795 50  0000 R CNN
F 2 "Package_TO_SOT_THT:TO-92_Inline" H 2050 2700 50  0001 C CIN
F 3 "http://ww1.microchip.com/downloads/en/DeviceDoc/20001826D.pdf" H 2050 2900 50  0001 C CNN
	1    2050 2900
	0    -1   -1   0   
$EndComp
$Comp
L Device:C C1
U 1 1 60CEE919
P 1600 1400
F 0 "C1" H 1715 1446 50  0000 L CNN
F 1 "1u" H 1715 1355 50  0000 L CNN
F 2 "Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm" H 1638 1250 50  0001 C CNN
F 3 "~" H 1600 1400 50  0001 C CNN
	1    1600 1400
	1    0    0    -1  
$EndComp
$Comp
L Connector:Conn_01x04_Male J3
U 1 1 60CEFE49
P 1350 3600
F 0 "J3" H 1458 3881 50  0000 C CNN
F 1 "Conn_01x04_Male" H 1458 3790 50  0000 C CNN
F 2 "Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical" H 1350 3600 50  0001 C CNN
F 3 "~" H 1350 3600 50  0001 C CNN
	1    1350 3600
	1    0    0    -1  
$EndComp
Wire Wire Line
	1550 3600 1550 3650
Wire Wire Line
	1550 3650 1700 3650
Connection ~ 1550 3650
Wire Wire Line
	1550 3650 1550 3700
$Comp
L power:GND #PWR0101
U 1 1 60CF80DF
P 1700 3650
F 0 "#PWR0101" H 1700 3400 50  0001 C CNN
F 1 "GND" V 1705 3522 50  0000 R CNN
F 2 "" H 1700 3650 50  0001 C CNN
F 3 "" H 1700 3650 50  0001 C CNN
	1    1700 3650
	0    -1   -1   0   
$EndComp
Wire Wire Line
	1550 3800 2200 3800
Wire Wire Line
	2200 3800 2200 3750
Wire Wire Line
	2200 3450 2050 3450
Wire Wire Line
	1850 3450 1850 3500
Wire Wire Line
	1850 3500 1550 3500
$Comp
L power:+BATT #PWR0102
U 1 1 60D02099
P 1850 3450
F 0 "#PWR0102" H 1850 3300 50  0001 C CNN
F 1 "+BATT" H 1865 3623 50  0000 C CNN
F 2 "" H 1850 3450 50  0001 C CNN
F 3 "" H 1850 3450 50  0001 C CNN
	1    1850 3450
	1    0    0    -1  
$EndComp
Connection ~ 1850 3450
Wire Wire Line
	2050 3200 2050 3350
Connection ~ 2050 3450
Wire Wire Line
	2050 3450 1850 3450
$Comp
L power:GND #PWR0103
U 1 1 60D0DD00
P 1750 2900
F 0 "#PWR0103" H 1750 2650 50  0001 C CNN
F 1 "GND" V 1755 2772 50  0000 R CNN
F 2 "" H 1750 2900 50  0001 C CNN
F 3 "" H 1750 2900 50  0001 C CNN
	1    1750 2900
	0    1    1    0   
$EndComp
$Comp
L power:+3V3 #PWR0104
U 1 1 60D0F4BC
P 2050 2600
F 0 "#PWR0104" H 2050 2450 50  0001 C CNN
F 1 "+3V3" H 2065 2773 50  0000 C CNN
F 2 "" H 2050 2600 50  0001 C CNN
F 3 "" H 2050 2600 50  0001 C CNN
	1    2050 2600
	1    0    0    -1  
$EndComp
$Comp
L power:+3V3 #PWR0106
U 1 1 60D11503
P 2200 1250
F 0 "#PWR0106" H 2200 1100 50  0001 C CNN
F 1 "+3V3" H 2215 1423 50  0000 C CNN
F 2 "" H 2200 1250 50  0001 C CNN
F 3 "" H 2200 1250 50  0001 C CNN
	1    2200 1250
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0107
U 1 1 60D11D03
P 2200 1550
F 0 "#PWR0107" H 2200 1300 50  0001 C CNN
F 1 "GND" H 2205 1377 50  0000 C CNN
F 2 "" H 2200 1550 50  0001 C CNN
F 3 "" H 2200 1550 50  0001 C CNN
	1    2200 1550
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0109
U 1 1 60D12AC8
P 1600 1550
F 0 "#PWR0109" H 1600 1300 50  0001 C CNN
F 1 "GND" H 1605 1377 50  0000 C CNN
F 2 "" H 1600 1550 50  0001 C CNN
F 3 "" H 1600 1550 50  0001 C CNN
	1    1600 1550
	1    0    0    -1  
$EndComp
$Comp
L power:+BATT #PWR0110
U 1 1 60D130BC
P 1600 1250
F 0 "#PWR0110" H 1600 1100 50  0001 C CNN
F 1 "+BATT" H 1615 1423 50  0000 C CNN
F 2 "" H 1600 1250 50  0001 C CNN
F 3 "" H 1600 1250 50  0001 C CNN
	1    1600 1250
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0111
U 1 1 60D2167D
P 2900 4850
F 0 "#PWR0111" H 2900 4600 50  0001 C CNN
F 1 "GND" H 2905 4677 50  0000 C CNN
F 2 "" H 2900 4850 50  0001 C CNN
F 3 "" H 2900 4850 50  0001 C CNN
	1    2900 4850
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0112
U 1 1 60D3C9B2
P 3800 1550
F 0 "#PWR0112" H 3800 1300 50  0001 C CNN
F 1 "GND" H 3805 1377 50  0000 C CNN
F 2 "" H 3800 1550 50  0001 C CNN
F 3 "" H 3800 1550 50  0001 C CNN
	1    3800 1550
	1    0    0    -1  
$EndComp
$Comp
L power:PWR_FLAG #FLG0101
U 1 1 60D3D2CE
P 3800 1250
F 0 "#FLG0101" H 3800 1325 50  0001 C CNN
F 1 "PWR_FLAG" H 3800 1423 50  0000 C CNN
F 2 "" H 3800 1250 50  0001 C CNN
F 3 "~" H 3800 1250 50  0001 C CNN
	1    3800 1250
	1    0    0    -1  
$EndComp
Wire Wire Line
	3800 1250 3800 1550
Wire Wire Line
	2900 3950 2900 4250
Text Label 7700 4700 0    50   ~ 0
SDA-B1
Text Label 7700 4600 0    50   ~ 0
SCL-B0
$Comp
L power:+3V3 #PWR0116
U 1 1 60D7060A
P 5800 4800
F 0 "#PWR0116" H 5800 4650 50  0001 C CNN
F 1 "+3V3" V 5815 4928 50  0000 L CNN
F 2 "" H 5800 4800 50  0001 C CNN
F 3 "" H 5800 4800 50  0001 C CNN
	1    5800 4800
	0    -1   -1   0   
$EndComp
Text Label 5800 4500 2    50   ~ 0
TX
Text Label 5800 4700 2    50   ~ 0
RST
Text Label 7700 4800 0    50   ~ 0
RX
$Comp
L power:+3V3 #PWR0118
U 1 1 60D8FC87
P 7200 3250
F 0 "#PWR0118" H 7200 3100 50  0001 C CNN
F 1 "+3V3" V 7215 3378 50  0000 L CNN
F 2 "" H 7200 3250 50  0001 C CNN
F 3 "" H 7200 3250 50  0001 C CNN
	1    7200 3250
	0    1    1    0   
$EndComp
$Comp
L power:GND #PWR0119
U 1 1 60D907C8
P 7200 2400
F 0 "#PWR0119" H 7200 2150 50  0001 C CNN
F 1 "GND" V 7205 2272 50  0000 R CNN
F 2 "" H 7200 2400 50  0001 C CNN
F 3 "" H 7200 2400 50  0001 C CNN
	1    7200 2400
	0    -1   -1   0   
$EndComp
Text Label 7100 3250 1    50   ~ 0
RST
Text Label 7000 2400 3    50   ~ 0
RX
Text Label 7100 2400 3    50   ~ 0
TX
Text Label 6800 2400 3    50   ~ 0
SCL-B0
Text Label 7000 3250 1    50   ~ 0
B2
Text Label 6400 2400 3    50   ~ 0
A3
Text Label 6500 2400 3    50   ~ 0
A2
Text Label 6600 2400 3    50   ~ 0
A1
Text Label 6700 2400 3    50   ~ 0
TRST
Text Label 6900 2400 3    50   ~ 0
SDA-B1
Text Label 6500 3250 1    50   ~ 0
A4
Text Label 6600 3250 1    50   ~ 0
A5
Text Label 6800 3250 1    50   ~ 0
A7
Text Label 6700 3250 1    50   ~ 0
A6
Text Label 6900 3250 1    50   ~ 0
B3
$Comp
L power:GND #PWR0120
U 1 1 60D95E9C
P 6300 2500
F 0 "#PWR0120" H 6300 2250 50  0001 C CNN
F 1 "GND" V 6305 2372 50  0000 R CNN
F 2 "" H 6300 2500 50  0001 C CNN
F 3 "" H 6300 2500 50  0001 C CNN
	1    6300 2500
	0    1    1    0   
$EndComp
$Comp
L power:+3V3 #PWR0121
U 1 1 60D968BD
P 6300 3250
F 0 "#PWR0121" H 6300 3100 50  0001 C CNN
F 1 "+3V3" V 6315 3378 50  0000 L CNN
F 2 "" H 6300 3250 50  0001 C CNN
F 3 "" H 6300 3250 50  0001 C CNN
	1    6300 3250
	0    -1   -1   0   
$EndComp
$Comp
L power:GND #PWR0122
U 1 1 60D98913
P 6400 3000
F 0 "#PWR0122" H 6400 2750 50  0001 C CNN
F 1 "GND" V 6405 2872 50  0000 R CNN
F 2 "" H 6400 3000 50  0001 C CNN
F 3 "" H 6400 3000 50  0001 C CNN
	1    6400 3000
	0    1    1    0   
$EndComp
Wire Wire Line
	6300 2400 6300 2500
Wire Wire Line
	6400 3000 6400 3250
$Comp
L power:PWR_FLAG #FLG0103
U 1 1 60DA3A21
P 4250 1550
F 0 "#FLG0103" H 4250 1625 50  0001 C CNN
F 1 "PWR_FLAG" H 4250 1723 50  0000 C CNN
F 2 "" H 4250 1550 50  0001 C CNN
F 3 "~" H 4250 1550 50  0001 C CNN
	1    4250 1550
	-1   0    0    1   
$EndComp
$Comp
L power:+BATT #PWR0123
U 1 1 60DA4A9F
P 4250 1250
F 0 "#PWR0123" H 4250 1100 50  0001 C CNN
F 1 "+BATT" H 4265 1423 50  0000 C CNN
F 2 "" H 4250 1250 50  0001 C CNN
F 3 "" H 4250 1250 50  0001 C CNN
	1    4250 1250
	1    0    0    -1  
$EndComp
Wire Wire Line
	4250 1250 4250 1550
$Comp
L Device:R R2
U 1 1 60ECB325
P 2200 3350
F 0 "R2" V 1993 3350 50  0000 C CNN
F 1 "1M" V 2084 3350 50  0000 C CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical" V 2130 3350 50  0001 C CNN
F 3 "~" H 2200 3350 50  0001 C CNN
	1    2200 3350
	0    1    1    0   
$EndComp
Connection ~ 2050 3350
Wire Wire Line
	2050 3350 2050 3450
$Comp
L Device:R R3
U 1 1 60ECBBB2
P 2700 3350
F 0 "R3" V 2493 3350 50  0000 C CNN
F 1 "1M" V 2584 3350 50  0000 C CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical" V 2630 3350 50  0001 C CNN
F 3 "~" H 2700 3350 50  0001 C CNN
	1    2700 3350
	0    1    1    0   
$EndComp
$Comp
L power:GND #PWR01
U 1 1 60ECC287
P 2850 3350
F 0 "#PWR01" H 2850 3100 50  0001 C CNN
F 1 "GND" V 2855 3222 50  0000 R CNN
F 2 "" H 2850 3350 50  0001 C CNN
F 3 "" H 2850 3350 50  0001 C CNN
	1    2850 3350
	0    -1   -1   0   
$EndComp
Text Label 2400 3350 0    50   ~ 0
A3
Wire Wire Line
	2350 3350 2550 3350
$Comp
L power:+3V3 #PWR03
U 1 1 60DC1CF3
P 5250 1250
F 0 "#PWR03" H 5250 1100 50  0001 C CNN
F 1 "+3V3" H 5265 1423 50  0000 C CNN
F 2 "" H 5250 1250 50  0001 C CNN
F 3 "" H 5250 1250 50  0001 C CNN
	1    5250 1250
	1    0    0    -1  
$EndComp
$Comp
L Device:R R4
U 1 1 60DC2CEA
P 5250 1400
F 0 "R4" H 5320 1446 50  0000 L CNN
F 1 "4k7" H 5320 1355 50  0000 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical" V 5180 1400 50  0001 C CNN
F 3 "~" H 5250 1400 50  0001 C CNN
	1    5250 1400
	1    0    0    -1  
$EndComp
Text Label 5250 1550 3    50   ~ 0
SDA-B1
$Comp
L power:+3V3 #PWR04
U 1 1 60DC3C00
P 5600 1250
F 0 "#PWR04" H 5600 1100 50  0001 C CNN
F 1 "+3V3" H 5615 1423 50  0000 C CNN
F 2 "" H 5600 1250 50  0001 C CNN
F 3 "" H 5600 1250 50  0001 C CNN
	1    5600 1250
	1    0    0    -1  
$EndComp
$Comp
L Device:R R5
U 1 1 60DC4A30
P 5600 1400
F 0 "R5" H 5670 1446 50  0000 L CNN
F 1 "4k7" H 5670 1355 50  0000 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical" V 5530 1400 50  0001 C CNN
F 3 "~" H 5600 1400 50  0001 C CNN
	1    5600 1400
	1    0    0    -1  
$EndComp
Text Label 5600 1550 3    50   ~ 0
SCL-B0
$Comp
L Jumper:SolderJumper_2_Bridged JP1
U 1 1 60DEB11A
P 3600 4350
F 0 "JP1" H 3600 4555 50  0000 C CNN
F 1 "SolderJumper_2" H 3600 4464 50  0000 C CNN
F 2 "Jumper:SolderJumper-2_P1.3mm_Bridged_RoundedPad1.0x1.5mm" H 3600 4350 50  0001 C CNN
F 3 "~" H 3600 4350 50  0001 C CNN
	1    3600 4350
	1    0    0    -1  
$EndComp
Text Label 3450 4350 2    50   ~ 0
A5
Text Label 3750 4350 0    50   ~ 0
RST
$Comp
L Jumper:SolderJumper_2_Open JP2
U 1 1 60E6A894
P 2700 2550
F 0 "JP2" H 2700 2755 50  0000 C CNN
F 1 "SolderJumper_2_Open" H 2700 2664 50  0000 C CNN
F 2 "Jumper:SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm" H 2700 2550 50  0001 C CNN
F 3 "~" H 2700 2550 50  0001 C CNN
	1    2700 2550
	1    0    0    -1  
$EndComp
$Comp
L power:+BATT #PWR07
U 1 1 60E6B378
P 2850 2550
F 0 "#PWR07" H 2850 2400 50  0001 C CNN
F 1 "+BATT" H 2865 2723 50  0000 C CNN
F 2 "" H 2850 2550 50  0001 C CNN
F 3 "" H 2850 2550 50  0001 C CNN
	1    2850 2550
	-1   0    0    1   
$EndComp
$Comp
L power:+3V3 #PWR06
U 1 1 60E6CDE9
P 2550 2550
F 0 "#PWR06" H 2550 2400 50  0001 C CNN
F 1 "+3V3" H 2565 2723 50  0000 C CNN
F 2 "" H 2550 2550 50  0001 C CNN
F 3 "" H 2550 2550 50  0001 C CNN
	1    2550 2550
	-1   0    0    1   
$EndComp
Text Notes 2100 2200 0    50   ~ 0
Jumper J2 connects the battery directly to\n3V3 when a regulator is not needed.
$Comp
L MyJumper:SolderJumper_3_Bridged12 JP3
U 1 1 60EC5FD3
P 5300 4600
F 0 "JP3" V 5346 4668 50  0000 L CNN
F 1 "SolderJumper_3_Bridged12" V 5255 4668 50  0000 L CNN
F 2 "Jumper:SolderJumper-3_P1.3mm_Bridged12_RoundedPad1.0x1.5mm_NumberLabels" H 5300 4600 50  0001 C CNN
F 3 "~" H 5300 4600 50  0001 C CNN
	1    5300 4600
	0    -1   -1   0   
$EndComp
$Comp
L power:+3V3 #PWR05
U 1 1 60EF28CB
P 5300 4850
F 0 "#PWR05" H 5300 4700 50  0001 C CNN
F 1 "+3V3" V 5315 4978 50  0000 L CNN
F 2 "" H 5300 4850 50  0001 C CNN
F 3 "" H 5300 4850 50  0001 C CNN
	1    5300 4850
	-1   0    0    1   
$EndComp
Text Label 2900 4150 0    50   ~ 0
A7
Text Label 5300 4400 0    50   ~ 0
A6
Wire Wire Line
	5900 4600 5800 4600
Wire Wire Line
	5300 4850 5300 4800
$Comp
L MCU_Microchip_ATtiny:ATtiny1614-SS U2
U 1 1 60ED8371
P 4700 3050
F 0 "U2" H 4700 3931 50  0000 C CNN
F 1 "ATtiny1614-SS" H 4700 3840 50  0000 C CNN
F 2 "Package_SO:SOIC-14_3.9x8.7mm_P1.27mm" H 4700 3050 50  0001 C CIN
F 3 "http://ww1.microchip.com/downloads/en/DeviceDoc/ATtiny1614-data-sheet-40001995A.pdf" H 4700 3050 50  0001 C CNN
	1    4700 3050
	1    0    0    -1  
$EndComp
Text Label 4100 2650 2    50   ~ 0
SCL-B0
Text Label 4100 2750 2    50   ~ 0
SDA-B1
Text Label 4100 2850 2    50   ~ 0
B2
Text Label 4100 2950 2    50   ~ 0
B3
Text Label 5300 2650 0    50   ~ 0
TRST
Text Label 5300 2750 0    50   ~ 0
A1
Text Label 5300 2850 0    50   ~ 0
A2
Text Label 5300 2950 0    50   ~ 0
A3
Text Label 5300 3050 0    50   ~ 0
A4
Text Label 5300 3150 0    50   ~ 0
A5
Text Label 5300 3250 0    50   ~ 0
A6
Text Label 5300 3350 0    50   ~ 0
A7
$Comp
L power:+3V3 #PWR0113
U 1 1 60EDC899
P 4700 2350
F 0 "#PWR0113" H 4700 2200 50  0001 C CNN
F 1 "+3V3" V 4715 2478 50  0000 L CNN
F 2 "" H 4700 2350 50  0001 C CNN
F 3 "" H 4700 2350 50  0001 C CNN
	1    4700 2350
	0    -1   -1   0   
$EndComp
$Comp
L power:GND #PWR0114
U 1 1 60EDD4B8
P 4700 3750
F 0 "#PWR0114" H 4700 3500 50  0001 C CNN
F 1 "GND" H 4705 3577 50  0000 C CNN
F 2 "" H 4700 3750 50  0001 C CNN
F 3 "" H 4700 3750 50  0001 C CNN
	1    4700 3750
	1    0    0    -1  
$EndComp
Connection ~ 5800 4600
Wire Wire Line
	5800 4600 5450 4600
$Comp
L Device:Crystal Y1
U 1 1 6124C799
P 2100 5950
F 0 "Y1" H 2100 6218 50  0000 C CNN
F 1 "Crystal 32.768kHz" H 2100 6127 50  0000 C CNN
F 2 "Crystal:Crystal_Round_D3.0mm_Vertical" H 2100 5950 50  0001 C CNN
F 3 "~" H 2100 5950 50  0001 C CNN
	1    2100 5950
	1    0    0    -1  
$EndComp
Text Label 1950 5950 2    50   ~ 0
B2
Text Label 2250 5950 0    50   ~ 0
B3
Text Notes 2500 5950 0    50   ~ 0
Optional crystal
$Comp
L Device:C C5
U 1 1 614724FD
P 2250 6100
F 0 "C5" H 2365 6146 50  0000 L CNN
F 1 "10p" H 2365 6055 50  0000 L CNN
F 2 "Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm" H 2288 5950 50  0001 C CNN
F 3 "~" H 2250 6100 50  0001 C CNN
	1    2250 6100
	1    0    0    -1  
$EndComp
$Comp
L Device:C C4
U 1 1 61474B5A
P 1950 6100
F 0 "C4" H 1700 6150 50  0000 L CNN
F 1 "10p" H 1700 6050 50  0000 L CNN
F 2 "Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm" H 1988 5950 50  0001 C CNN
F 3 "~" H 1950 6100 50  0001 C CNN
	1    1950 6100
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0115
U 1 1 6147542A
P 2250 6250
F 0 "#PWR0115" H 2250 6000 50  0001 C CNN
F 1 "GND" H 2255 6077 50  0000 C CNN
F 2 "" H 2250 6250 50  0001 C CNN
F 3 "" H 2250 6250 50  0001 C CNN
	1    2250 6250
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0117
U 1 1 61475D6F
P 1950 6250
F 0 "#PWR0117" H 1950 6000 50  0001 C CNN
F 1 "GND" H 1955 6077 50  0000 C CNN
F 2 "" H 1950 6250 50  0001 C CNN
F 3 "" H 1950 6250 50  0001 C CNN
	1    1950 6250
	1    0    0    -1  
$EndComp
$EndSCHEMATC