EESchema Schematic File Version 4 EELAYER 30 0 EELAYER END $Descr A4 11693 8268 encoding utf-8 Sheet 1 2 Title "ROM development board" Date "2020-05-18" Rev "1" Comp "" Comment1 "" Comment2 "" Comment3 "License: Creative Commons Attribution Share-Alike (CC BY-SA)" Comment4 "Copyright (C) 2020 John Tsiombikas " $EndDescr $Comp L Connector:USB_B_Micro J2 U 1 1 5EC163C7 P 1600 5100 F 0 "J2" H 1370 5089 50 0000 R CNN F 1 "USB_B_Micro" H 1370 4998 50 0000 R CNN F 2 "Connector_USB:USB_Micro-B_Molex-105017-0001" H 1750 5050 50 0001 C CNN F 3 "~" H 1750 5050 50 0001 C CNN 1 1600 5100 1 0 0 -1 $EndComp $Comp L Device:Crystal_Small Y1 U 1 1 5EC18BB4 P 1550 2450 F 0 "Y1" V 1550 2350 50 0000 R CNN F 1 "14.7456" V 1700 2600 50 0000 R CNN F 2 "Crystal:Crystal_SMD_ECS_CSM3X-2Pin_7.6x4.1mm" H 1550 2450 50 0001 C CNN F 3 "~" H 1550 2450 50 0001 C CNN 1 1550 2450 0 1 1 0 $EndComp $Comp L power:GND #PWR02 U 1 1 5EC26DD6 P 1100 2550 F 0 "#PWR02" H 1100 2300 50 0001 C CNN F 1 "GND" H 1100 2400 50 0000 C CNN F 2 "" H 1100 2550 50 0001 C CNN F 3 "" H 1100 2550 50 0001 C CNN 1 1100 2550 1 0 0 -1 $EndComp $Comp L Device:C_Small C2 U 1 1 5EC2AB68 P 1300 2550 F 0 "C2" V 1250 2450 50 0000 C CNN F 1 "22pF" V 1450 2550 50 0000 C CNN F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 1300 2550 50 0001 C CNN F 3 "~" H 1300 2550 50 0001 C CNN 1 1300 2550 0 1 1 0 $EndComp $Comp L Device:C_Small C1 U 1 1 5EC2D7FC P 1300 2350 F 0 "C1" V 1350 2250 50 0000 C CNN F 1 "22pF" V 1450 2350 50 0000 C CNN F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 1300 2350 50 0001 C CNN F 3 "~" H 1300 2350 50 0001 C CNN 1 1300 2350 0 1 -1 0 $EndComp $Comp L emurom:sram_um61512ak U6 U 1 1 5EC358D5 P 5550 2150 F 0 "U6" H 5650 3250 60 0000 C CNN F 1 "sram_um61512ak" V 5550 2200 60 0000 C CNN F 2 "Package_DIP:DIP-32_W7.62mm" H 5450 1350 60 0001 C CNN F 3 "" H 5450 1350 60 0000 C CNN 1 5550 2150 1 0 0 -1 $EndComp $Comp L 74xx:74LS595 U4 U 1 1 5EC37092 P 4050 1550 F 0 "U4" H 4150 2100 50 0000 C CNN F 1 "74HCT595" H 3800 900 50 0000 C CNN F 2 "Package_SO:SOIC-16_3.9x9.9mm_P1.27mm" H 4050 1550 50 0001 C CNN F 3 "http://www.ti.com/lit/gpn/sn74ls595" H 4050 1550 50 0001 C CNN 1 4050 1550 1 0 0 -1 $EndComp $Comp L emurom:mcp2221 U2 U 1 1 5EC41AB3 P 2700 5500 F 0 "U2" H 2800 6000 50 0000 C CNN F 1 "mcp2221" V 2700 5500 50 0000 C CNN F 2 "Package_SO:SOIC-14_3.9x8.7mm_P1.27mm" H 2700 5200 50 0001 C CNN F 3 "" H 2700 5200 50 0001 C CNN 1 2700 5500 -1 0 0 -1 $EndComp Wire Wire Line 1900 5100 2200 5100 Wire Wire Line 2200 5200 1900 5200 Wire Wire Line 1900 4900 2300 4900 Wire Wire Line 2300 4900 2300 4850 Wire Wire Line 2300 4850 2700 4850 $Comp L power:VCC #PWR08 U 1 1 5EC4ADDD P 2700 4850 F 0 "#PWR08" H 2700 4700 50 0001 C CNN F 1 "VCC" H 2700 5000 50 0000 C CNN F 2 "" H 2700 4850 50 0001 C CNN F 3 "" H 2700 4850 50 0001 C CNN 1 2700 4850 -1 0 0 -1 $EndComp Connection ~ 2700 4850 $Comp L power:GND #PWR09 U 1 1 5EC4C3CB P 2700 6150 F 0 "#PWR09" H 2700 5900 50 0001 C CNN F 1 "GND" H 2700 6000 50 0000 C CNN F 2 "" H 2700 6150 50 0001 C CNN F 3 "" H 2700 6150 50 0001 C CNN 1 2700 6150 -1 0 0 -1 $EndComp $Comp L Device:C_Small C4 U 1 1 5EC4CE51 P 2150 6050 F 0 "C4" H 2050 6100 50 0000 R CNN F 1 "0.1uF" H 2200 6200 50 0000 R CNN F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 2150 6050 50 0001 C CNN F 3 "~" H 2150 6050 50 0001 C CNN 1 2150 6050 -1 0 0 1 $EndComp Connection ~ 2700 6150 $Comp L Device:C_Small C3 U 1 1 5EC560E6 P 2000 6050 F 0 "C3" H 1900 6100 50 0000 R CNN F 1 "0.1uF" H 2050 6200 50 0000 R CNN F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 2000 6050 50 0001 C CNN F 3 "~" H 2000 6050 50 0001 C CNN 1 2000 6050 1 0 0 1 $EndComp Wire Wire Line 2700 6150 2150 6150 Connection ~ 2150 6150 Wire Wire Line 2150 6150 2000 6150 Wire Wire Line 2000 5950 2000 5900 Wire Wire Line 2000 5900 2150 5900 Wire Wire Line 2150 5950 2150 5900 Connection ~ 2150 5900 Wire Wire Line 2150 5900 2200 5900 NoConn ~ 1500 5500 $Comp L power:GND #PWR05 U 1 1 5EC5CA0E P 1600 5500 F 0 "#PWR05" H 1600 5250 50 0001 C CNN F 1 "GND" H 1600 5350 50 0000 C CNN F 2 "" H 1600 5500 50 0001 C CNN F 3 "" H 1600 5500 50 0001 C CNN 1 1600 5500 -1 0 0 -1 $EndComp Wire Wire Line 2200 5400 1850 5400 Wire Wire Line 1850 5400 1850 5750 Wire Wire Line 2200 5500 1900 5500 Wire Wire Line 1900 5500 1900 5900 Wire Wire Line 1900 5900 1400 5900 Wire Wire Line 1850 5750 1400 5750 $Comp L Device:LED D2 U 1 1 5EC5A868 P 1250 5900 F 0 "D2" H 1250 6100 50 0000 C CNN F 1 "TxLED" H 1250 6000 50 0000 C CNN F 2 "LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 1250 5900 50 0001 C CNN F 3 "~" H 1250 5900 50 0001 C CNN 1 1250 5900 -1 0 0 1 $EndComp $Comp L Device:LED D1 U 1 1 5EC5A43E P 1250 5750 F 0 "D1" H 1250 5550 50 0000 C CNN F 1 "RxLED" H 1250 5650 50 0000 C CNN F 2 "LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 1250 5750 50 0001 C CNN F 3 "~" H 1250 5750 50 0001 C CNN 1 1250 5750 -1 0 0 1 $EndComp $Comp L power:VCC #PWR01 U 1 1 5EC76B82 P 750 5650 F 0 "#PWR01" H 750 5500 50 0001 C CNN F 1 "VCC" H 750 5800 50 0000 C CNN F 2 "" H 750 5650 50 0001 C CNN F 3 "" H 750 5650 50 0001 C CNN 1 750 5650 -1 0 0 -1 $EndComp $Comp L Device:R R1 U 1 1 5EC77908 P 900 5750 F 0 "R1" V 800 5750 50 0000 C CNN F 1 "330R" V 900 5750 50 0000 C CNN F 2 "Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder" V 830 5750 50 0001 C CNN F 3 "~" H 900 5750 50 0001 C CNN 1 900 5750 0 -1 1 0 $EndComp $Comp L Device:R R2 U 1 1 5EC77DF4 P 900 5900 F 0 "R2" V 800 5900 50 0000 C CNN F 1 "330R" V 900 5900 50 0000 C CNN F 2 "Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder" V 830 5900 50 0001 C CNN F 3 "~" H 900 5900 50 0001 C CNN 1 900 5900 0 1 -1 0 $EndComp Wire Wire Line 1050 5750 1100 5750 Wire Wire Line 1050 5900 1100 5900 Wire Wire Line 750 5650 750 5750 Connection ~ 750 5750 Wire Wire Line 750 5750 750 5900 NoConn ~ 2200 5600 NoConn ~ 2200 5700 NoConn ~ 3200 5400 NoConn ~ 3200 5500 Wire Wire Line 3200 5650 3400 5650 Text Label 3400 5650 2 50 ~ 0 ~RST Text Label 2850 3150 0 50 ~ 0 ~RST Wire Wire Line 2800 2150 3050 2150 Wire Wire Line 2800 3650 3150 3650 Wire Wire Line 2800 3750 3150 3750 Wire Wire Line 2800 3850 3150 3850 Wire Wire Line 2800 3950 3150 3950 Wire Wire Line 2800 4050 3150 4050 Wire Wire Line 2800 4150 3150 4150 Text Label 2850 3650 0 50 ~ 0 D2 Text Label 2850 3750 0 50 ~ 0 D3 Text Label 2850 3850 0 50 ~ 0 D4 Text Label 2850 3950 0 50 ~ 0 D5 Text Label 2850 4050 0 50 ~ 0 D6 Text Label 2850 4150 0 50 ~ 0 D7 Text Label 2850 1950 0 50 ~ 0 ~SS $Comp L 74xx:74HC244 U9 U 1 1 5ECDEAC2 P 7200 2550 F 0 "U9" H 7300 3200 50 0000 C CNN F 1 "74HCT244" H 7400 1900 50 0000 C CNN F 2 "Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm" H 7200 2550 50 0001 C CNN F 3 "https://assets.nexperia.com/documents/data-sheet/74HC_HCT244.pdf" H 7200 2550 50 0001 C CNN 1 7200 2550 1 0 0 -1 $EndComp Text Label 2850 1850 0 50 ~ 0 D1 Text Label 2850 1750 0 50 ~ 0 D0 Wire Wire Line 2800 1850 3150 1850 Wire Wire Line 2800 1750 3150 1750 $Comp L emurom:ATmega328P-AU U1 U 1 1 5ED09330 P 2200 2950 F 0 "U1" H 2350 1500 50 0000 C CNN F 1 "ATmega328P-AU" V 2050 2750 50 0000 C CNN F 2 "Package_QFP:TQFP-32_7x7mm_P0.8mm" H 2200 3050 50 0001 C CIN F 3 "http://ww1.microchip.com/downloads/en/DeviceDoc/ATmega328_P%20AVR%20MCU%20with%20picoPower%20Technology%20Data%20Sheet%2040001984A.pdf" H 2200 2950 50 0001 C CNN 1 2200 2950 1 0 0 -1 $EndComp Wire Wire Line 1550 2350 1600 2350 Wire Wire Line 1550 2550 1600 2550 Wire Wire Line 1400 2350 1550 2350 Connection ~ 1550 2350 Wire Wire Line 1400 2550 1550 2550 Connection ~ 1550 2550 Wire Wire Line 1200 2550 1100 2550 Wire Wire Line 1100 2550 1100 2350 Wire Wire Line 1100 2350 1200 2350 Connection ~ 1100 2550 NoConn ~ 1600 1750 NoConn ~ 1600 1950 NoConn ~ 1600 2050 $Comp L power:VCC #PWR06 U 1 1 5ED3898C P 2200 1450 F 0 "#PWR06" H 2200 1300 50 0001 C CNN F 1 "VCC" H 2200 1600 50 0000 C CNN F 2 "" H 2200 1450 50 0001 C CNN F 3 "" H 2200 1450 50 0001 C CNN 1 2200 1450 1 0 0 -1 $EndComp Wire Wire Line 2200 1450 2300 1450 Connection ~ 2200 1450 $Comp L power:GND #PWR07 U 1 1 5ED3B644 P 2200 4450 F 0 "#PWR07" H 2200 4200 50 0001 C CNN F 1 "GND" H 2200 4300 50 0000 C CNN F 2 "" H 2200 4450 50 0001 C CNN F 3 "" H 2200 4450 50 0001 C CNN 1 2200 4450 1 0 0 -1 $EndComp Entry Wire Line 3150 1850 3250 1750 Entry Wire Line 3150 1750 3250 1650 Entry Wire Line 3150 4150 3250 4250 Entry Wire Line 3150 4050 3250 4150 Entry Wire Line 3150 3950 3250 4050 Entry Wire Line 3150 3850 3250 3950 Entry Wire Line 3150 3750 3250 3850 Entry Wire Line 3150 3650 3250 3750 $Comp L power:VCC #PWR013 U 1 1 5ED7402F P 4050 950 F 0 "#PWR013" H 4050 800 50 0001 C CNN F 1 "VCC" H 4050 1100 50 0000 C CNN F 2 "" H 4050 950 50 0001 C CNN F 3 "" H 4050 950 50 0001 C CNN 1 4050 950 1 0 0 -1 $EndComp $Comp L power:GND #PWR014 U 1 1 5EDA0BB4 P 4050 2250 F 0 "#PWR014" H 4050 2000 50 0001 C CNN F 1 "GND" H 4050 2100 50 0000 C CNN F 2 "" H 4050 2250 50 0001 C CNN F 3 "" H 4050 2250 50 0001 C CNN 1 4050 2250 1 0 0 -1 $EndComp $Comp L 74xx:74LS595 U5 U 1 1 5EDE23C3 P 4050 3250 F 0 "U5" H 4150 3800 50 0000 C CNN F 1 "74HCT595" H 3800 2600 50 0000 C CNN F 2 "Package_SO:SOIC-16_3.9x9.9mm_P1.27mm" H 4050 3250 50 0001 C CNN F 3 "http://www.ti.com/lit/gpn/sn74ls595" H 4050 3250 50 0001 C CNN 1 4050 3250 1 0 0 -1 $EndComp $Comp L power:VCC #PWR015 U 1 1 5EDE23CD P 4050 2650 F 0 "#PWR015" H 4050 2500 50 0001 C CNN F 1 "VCC" H 4050 2800 50 0000 C CNN F 2 "" H 4050 2650 50 0001 C CNN F 3 "" H 4050 2650 50 0001 C CNN 1 4050 2650 1 0 0 -1 $EndComp $Comp L power:GND #PWR016 U 1 1 5EDE23D7 P 4050 3950 F 0 "#PWR016" H 4050 3700 50 0001 C CNN F 1 "GND" H 4050 3800 50 0000 C CNN F 2 "" H 4050 3950 50 0001 C CNN F 3 "" H 4050 3950 50 0001 C CNN 1 4050 3950 1 0 0 -1 $EndComp Wire Wire Line 3400 2050 3400 1150 Wire Wire Line 3400 1150 3650 1150 Wire Wire Line 3450 1350 3650 1350 Wire Wire Line 3450 3050 3650 3050 Connection ~ 3450 2250 Wire Wire Line 2800 1950 3500 1950 Wire Wire Line 3500 1650 3650 1650 Wire Wire Line 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1450 7150 50 0001 C CNN F 1 "GND" H 1450 7250 50 0000 C CNN F 2 "" H 1450 7400 50 0001 C CNN F 3 "" H 1450 7400 50 0001 C CNN 1 1450 7400 -1 0 0 -1 $EndComp Wire Wire Line 1950 6800 2250 6800 Wire Wire Line 1950 6900 2250 6900 Wire Wire Line 1950 7000 2250 7000 Wire Wire Line 1950 7100 2250 7100 Text Label 2000 6800 0 50 ~ 0 MISO Text Label 2000 6900 0 50 ~ 0 MOSI Text Label 2000 7000 0 50 ~ 0 SCK Text Label 2000 7100 0 50 ~ 0 ~RST Text Label 4750 5100 1 50 ~ 0 A[0..15] $Comp L emurom:conn32k U11 U 1 1 5FAB03BB P 9500 5050 F 0 "U11" H 9600 5950 50 0000 C CNN F 1 "conn32k" V 9500 5100 50 0000 C CNN F 2 "emurom:conn32k" H 9500 5050 50 0001 C CNN F 3 "" H 9500 5050 50 0001 C CNN 1 9500 5050 1 0 0 -1 $EndComp $Sheet S 600 3450 850 900 U 5FAB6BE4 F0 "dipconn" 50 F1 "dipconn.sch" 50 $EndSheet $Comp L emurom:conn2k U10 U 1 1 5FBD48AD P 9500 2600 F 0 "U10" H 9600 3350 50 0000 C CNN F 1 "conn2k" V 9500 2600 50 0000 C CNN F 2 "emurom:conn2k" H 9500 2450 50 0001 C CNN F 3 "" H 9500 2450 50 0001 C CNN 1 9500 2600 1 0 0 -1 $EndComp $Comp L power:GND #PWR028 U 1 1 5FBF502D P 9500 3500 F 0 "#PWR028" H 9500 3250 50 0001 C CNN F 1 "GND" H 9500 3350 50 0000 C CNN F 2 "" H 9500 3500 50 0001 C CNN F 3 "" H 9500 3500 50 0001 C CNN 1 9500 3500 -1 0 0 -1 $EndComp $Comp L power:GND #PWR029 U 1 1 5FBF6302 P 9500 6000 F 0 "#PWR029" H 9500 5750 50 0001 C CNN F 1 "GND" H 9500 5850 50 0000 C CNN F 2 "" H 9500 6000 50 0001 C CNN F 3 "" H 9500 6000 50 0001 C CNN 1 9500 6000 -1 0 0 -1 $EndComp $Comp L Device:Jumper JP1 U 1 1 5FBF8329 P 10550 1400 F 0 "JP1" V 10504 1526 50 0000 L CNN F 1 "VCCOUT" V 10595 1526 50 0000 L CNN F 2 "Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical" H 10550 1400 50 0001 C CNN F 3 "~" H 10550 1400 50 0001 C CNN 1 10550 1400 0 1 1 0 $EndComp Entry Wire Line 8000 2750 8100 2650 Entry Wire Line 8000 2650 8100 2550 Entry Wire Line 8000 2550 8100 2450 Entry Wire Line 8000 2450 8100 2350 Entry Wire Line 8000 2350 8100 2250 Entry Wire Line 8000 2250 8100 2150 Entry Wire 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Wire Line 8650 3000 8750 2900 Entry Wire Line 8650 2900 8750 2800 Entry Wire Line 8650 2800 8750 2700 Entry Wire Line 8650 2700 8750 2600 Entry Wire Line 8650 2600 8750 2500 Entry Wire Line 8650 2500 8750 2400 Entry Wire Line 8650 2400 8750 2300 Entry Wire Line 8650 2300 8750 2200 Entry Wire Line 8650 2200 8750 2100 Entry Wire Line 8650 2100 8750 2000 Entry Wire Line 8650 5800 8750 5700 Entry Wire Line 8650 5700 8750 5600 Entry Wire Line 8650 5600 8750 5500 Entry Wire Line 8650 5500 8750 5400 Entry Wire Line 8650 5400 8750 5300 Entry Wire Line 8650 5300 8750 5200 Entry Wire Line 8650 5200 8750 5100 Entry Wire Line 8650 5100 8750 5000 Entry Wire Line 8650 5000 8750 4900 Entry Wire Line 8650 4900 8750 4800 Entry Wire Line 8650 4800 8750 4700 Entry Wire Line 8650 4700 8750 4600 Entry Wire Line 8650 4600 8750 4500 Entry Wire Line 8650 4500 8750 4400 Entry Wire Line 8650 4400 8750 4300 Entry Wire Line 6550 3850 6650 3950 Entry Wire Line 6550 3950 6650 4050 Entry Wire Line 6550 4050 6650 4150 Entry Wire Line 6550 4150 6650 4250 Entry Wire Line 6550 4250 6650 4350 Entry Wire Line 6550 4350 6650 4450 Entry Wire Line 6550 4450 6650 4550 Entry Wire Line 6550 4550 6650 4650 Entry Wire Line 6550 5550 6650 5650 Entry Wire Line 6550 5650 6650 5750 Entry Wire Line 6550 5750 6650 5850 Entry Wire Line 6550 5850 6650 5950 Entry Wire Line 6550 5950 6650 6050 Entry Wire Line 6550 6050 6650 6150 Entry Wire Line 6550 6150 6650 6250 Wire Bus Line 6650 6450 8650 6450 Wire Bus Line 8100 1500 10350 1500 $Comp L power:VCC #PWR030 U 1 1 60254125 P 10550 1100 F 0 "#PWR030" H 10550 950 50 0001 C CNN F 1 "VCC" H 10550 1250 50 0000 C CNN F 2 "" H 10550 1100 50 0001 C CNN F 3 "" H 10550 1100 50 0001 C CNN 1 10550 1100 -1 0 0 -1 $EndComp Wire Wire Line 10550 1700 9500 1700 Wire Wire Line 10550 1700 10550 4000 Wire Wire Line 10550 4000 9500 4000 Connection ~ 10550 1700 Text Label 9550 1700 0 50 ~ 0 VCCOUT Text Label 9550 4000 0 50 ~ 0 VCCOUT Text Label 8800 1500 0 50 ~ 0 SYSD[0..7] Text Label 7300 6450 0 50 ~ 0 SYSA[0..14] NoConn ~ 9950 3200 NoConn ~ 9950 5600 Wire Wire Line 2800 2550 2950 2550 Text Label 2800 2550 0 50 ~ 0 PGM Wire Wire Line 6500 4750 6300 4750 Text Label 6300 4750 0 50 ~ 0 PGM Text Label 6050 6450 0 50 ~ 0 PGM Wire Wire Line 5000 2900 4800 2900 Text Label 9950 5500 0 50 ~ 0 ~SYSOE Wire Wire Line 9950 5500 10200 5500 Text Label 9950 3100 0 50 ~ 0 ~SYSOE Wire Wire Line 9950 3100 10200 3100 $Comp L 74xx:74LS157 U3 U 1 1 603A2A56 P 3900 6550 F 0 "U3" H 4000 7300 50 0000 C CNN F 1 "74HCT157" V 3900 6550 50 0000 C CNN F 2 "Package_SO:SOIC-16_4.55x10.3mm_P1.27mm" H 3900 6550 50 0001 C CNN F 3 "http://www.ti.com/lit/gpn/sn74LS157" H 3900 6550 50 0001 C CNN 1 3900 6550 1 0 0 -1 $EndComp $Comp L power:VCC #PWR011 U 1 1 603C3810 P 3900 5650 F 0 "#PWR011" H 3900 5500 50 0001 C CNN F 1 "VCC" H 3900 5800 50 0000 C CNN F 2 "" H 3900 5650 50 0001 C CNN F 3 "" H 3900 5650 50 0001 C CNN 1 3900 5650 -1 0 0 -1 $EndComp $Comp L power:GND #PWR012 U 1 1 603C515C P 3900 7550 F 0 "#PWR012" H 3900 7300 50 0001 C CNN F 1 "GND" H 3900 7400 50 0000 C CNN F 2 "" H 3900 7550 50 0001 C CNN F 3 "" H 3900 7550 50 0001 C CNN 1 3900 7550 -1 0 0 -1 $EndComp Wire Wire Line 2800 2650 2950 2650 Wire Wire Line 2800 2750 2950 2750 Text Label 2800 2650 0 50 ~ 0 ~CS Wire Wire Line 3400 7150 3200 7150 Text Label 3200 7150 0 50 ~ 0 PGM Wire Wire Line 3400 5950 3150 5950 Wire Wire Line 3400 6050 3150 6050 Text Label 3150 5950 0 50 ~ 0 ~SYSOE Text Label 2800 2750 0 50 ~ 0 ~WR Wire Wire Line 2800 2850 2950 2850 Text Label 2800 2850 0 50 ~ 0 ~OE Text Label 3250 6050 0 50 ~ 0 ~OE Wire Wire Line 3150 6250 3400 6250 Wire Wire Line 3150 6350 3400 6350 Text Label 3250 6350 0 50 ~ 0 ~CS Text Label 3150 6250 0 50 ~ 0 ~SYSCS Wire Wire Line 9950 5700 10200 5700 Text Label 9950 5700 0 50 ~ 0 ~SYSCS Wire Wire Line 8800 3200 9050 3200 Text Label 8800 3200 0 50 ~ 0 ~SYSCS Wire Wire Line 5000 3000 4850 3000 Text Label 4900 3000 0 50 ~ 0 ~WR Text Label 4800 2900 0 50 ~ 0 ~RAMOE Wire Wire Line 5000 3100 4800 3100 Text Label 4800 3100 0 50 ~ 0 ~RAMCS $Comp L power:VCC #PWR017 U 1 1 60708BFD P 4900 3300 F 0 "#PWR017" H 4900 3150 50 0001 C CNN F 1 "VCC" H 4900 3450 50 0000 C CNN F 2 "" H 4900 3300 50 0001 C CNN F 3 "" H 4900 3300 50 0001 C CNN 1 4900 3300 -1 0 0 -1 $EndComp Wire Wire Line 4900 3300 5000 3300 Wire Wire Line 5000 3300 5000 3200 Connection ~ 5550 6850 Wire Wire Line 4400 5950 4650 5950 Text Label 4400 5950 0 50 ~ 0 ~RAMOE Wire Wire Line 4400 6250 4650 6250 Text Label 4400 6250 0 50 ~ 0 ~RAMCS NoConn ~ 4400 6550 NoConn ~ 4400 6850 $Comp L power:GND #PWR010 U 1 1 607F5969 P 3200 6550 F 0 "#PWR010" H 3200 6300 50 0001 C CNN F 1 "GND" H 3200 6400 50 0000 C CNN F 2 "" H 3200 6550 50 0001 C CNN F 3 "" H 3200 6550 50 0001 C CNN 1 3200 6550 -1 0 0 -1 $EndComp Wire Wire Line 3400 6550 3400 6650 Connection ~ 3400 6650 Wire Wire Line 3400 6650 3400 6850 Connection ~ 3400 6850 Wire Wire Line 3400 6850 3400 6950 Wire Wire Line 3200 6550 3400 6550 Connection ~ 3400 6550 Wire Wire Line 3400 7250 3400 7550 Wire Wire Line 3400 7550 3900 7550 Connection ~ 3900 7550 $Comp L Device:C C5 U 1 1 608712E4 P 7000 950 F 0 "C5" H 6950 1150 50 0000 L CNN F 1 "0.1uF" H 6900 750 50 0000 L CNN F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 7038 800 50 0001 C CNN F 3 "~" H 7000 950 50 0001 C CNN 1 7000 950 1 0 0 -1 $EndComp $Comp L Device:C C6 U 1 1 6087551A P 7250 950 F 0 "C6" H 7200 1150 50 0000 L CNN F 1 "0.1uF" H 7150 750 50 0000 L CNN F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 7288 800 50 0001 C CNN F 3 "~" H 7250 950 50 0001 C CNN 1 7250 950 1 0 0 -1 $EndComp $Comp L Device:C C7 U 1 1 608757E2 P 7500 950 F 0 "C7" H 7450 1150 50 0000 L CNN F 1 "0.1uF" H 7400 750 50 0000 L CNN F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 7538 800 50 0001 C CNN F 3 "~" H 7500 950 50 0001 C CNN 1 7500 950 1 0 0 -1 $EndComp $Comp L Device:C C8 U 1 1 6087734E P 7750 950 F 0 "C8" H 7700 1150 50 0000 L CNN F 1 "0.1uF" H 7650 750 50 0000 L CNN F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 7788 800 50 0001 C CNN F 3 "~" H 7750 950 50 0001 C CNN 1 7750 950 1 0 0 -1 $EndComp $Comp L Device:C C9 U 1 1 608775E5 P 8000 950 F 0 "C9" H 7950 1150 50 0000 L CNN F 1 "0.1uF" H 7900 750 50 0000 L CNN F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 8038 800 50 0001 C CNN F 3 "~" H 8000 950 50 0001 C CNN 1 8000 950 1 0 0 -1 $EndComp $Comp L Device:C C10 U 1 1 60877E21 P 8250 950 F 0 "C10" H 8200 1150 50 0000 L CNN F 1 "0.1uF" H 8150 750 50 0000 L CNN F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 8288 800 50 0001 C CNN F 3 "~" H 8250 950 50 0001 C CNN 1 8250 950 1 0 0 -1 $EndComp $Comp L Device:C C11 U 1 1 6087803A P 8500 950 F 0 "C11" H 8450 1150 50 0000 L CNN F 1 "0.1uF" H 8400 750 50 0000 L CNN F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 8538 800 50 0001 C CNN F 3 "~" H 8500 950 50 0001 C CNN 1 8500 950 1 0 0 -1 $EndComp $Comp L Device:C C12 U 1 1 60878368 P 8750 950 F 0 "C12" H 8700 1150 50 0000 L CNN F 1 "0.1uF" H 8650 750 50 0000 L CNN F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 8788 800 50 0001 C CNN F 3 "~" H 8750 950 50 0001 C CNN 1 8750 950 1 0 0 -1 $EndComp $Comp L Device:C C13 U 1 1 60893FC1 P 9000 950 F 0 "C13" H 8950 1150 50 0000 L CNN F 1 "0.1uF" H 8900 750 50 0000 L CNN F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 9038 800 50 0001 C CNN F 3 "~" H 9000 950 50 0001 C CNN 1 9000 950 1 0 0 -1 $EndComp $Comp L power:GND #PWR025 U 1 1 60895593 P 6850 1100 F 0 "#PWR025" H 6850 850 50 0001 C CNN F 1 "GND" H 6850 950 50 0000 C CNN F 2 "" H 6850 1100 50 0001 C CNN F 3 "" H 6850 1100 50 0001 C CNN 1 6850 1100 -1 0 0 -1 $EndComp $Comp L power:VCC #PWR024 U 1 1 6089701F P 6850 800 F 0 "#PWR024" H 6850 650 50 0001 C CNN F 1 "VCC" H 6850 950 50 0000 C CNN F 2 "" H 6850 800 50 0001 C CNN F 3 "" H 6850 800 50 0001 C CNN 1 6850 800 -1 0 0 -1 $EndComp Wire Wire Line 6850 800 7000 800 Connection ~ 7000 800 Wire Wire Line 7000 800 7250 800 Connection ~ 7250 800 Wire Wire Line 7250 800 7500 800 Connection ~ 7500 800 Wire Wire Line 7500 800 7750 800 Connection ~ 7750 800 Wire Wire Line 7750 800 8000 800 Connection ~ 8000 800 Wire Wire Line 8000 800 8250 800 Connection ~ 8250 800 Wire Wire Line 8250 800 8500 800 Connection ~ 8500 800 Wire Wire Line 8500 800 8750 800 Connection ~ 8750 800 Wire Wire Line 8750 800 9000 800 Wire Wire Line 6850 1100 7000 1100 Connection ~ 7000 1100 Wire Wire Line 7000 1100 7250 1100 Connection ~ 7250 1100 Wire Wire Line 7250 1100 7500 1100 Connection ~ 7500 1100 Wire Wire Line 7500 1100 7750 1100 Connection ~ 7750 1100 Wire Wire Line 7750 1100 8000 1100 Connection ~ 8000 1100 Wire Wire Line 8000 1100 8250 1100 Connection ~ 8250 1100 Wire Wire Line 8250 1100 8500 1100 Connection ~ 8500 1100 Wire Wire Line 8500 1100 8750 1100 Connection ~ 8750 1100 Wire Wire Line 8750 1100 9000 1100 Text Notes 7750 650 0 50 ~ 0 bypass capacitors NoConn ~ 1900 5300 Text Label 2800 3050 0 50 ~ 0 ~SYSRST $Comp L Connector:Conn_01x01_Male J7 U 1 1 60C37FAA P 3150 2750 F 0 "J7" V 3100 2700 50 0000 L CNN F 1 "SYSRST" H 3150 2800 50 0000 L CNN F 2 "Connector_PinSocket_2.54mm:PinSocket_1x01_P2.54mm_Vertical" H 3150 2750 50 0001 C CNN F 3 "~" H 3150 2750 50 0001 C CNN 1 3150 2750 0 1 1 0 $EndComp Wire Wire Line 3150 3050 3150 2950 Wire Wire Line 2800 3050 3150 3050 $Comp L Device:R R3 U 1 1 60D2872F P 7200 5000 F 0 "R3" V 7200 4750 50 0000 C CNN F 1 "4K7" V 7200 5000 50 0000 C CNN F 2 "Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder" V 7130 5000 50 0001 C CNN F 3 "~" H 7200 5000 50 0001 C CNN 1 7200 5000 0 -1 1 0 $EndComp Wire Wire Line 6250 6450 6050 6450 Wire Wire Line 6050 6250 6400 6250 Wire Wire Line 6400 6250 6400 6850 Entry Wire Line 6650 4900 6750 5000 Entry Wire Line 6650 5000 6750 5100 Entry Wire Line 6650 5100 6750 5200 Entry Wire Line 6650 5200 6750 5300 Wire Wire Line 6750 5000 7050 5000 Wire Wire Line 6750 5100 7050 5100 Wire Wire Line 6750 5200 7050 5200 Wire Wire Line 6750 5300 7050 5300 Text Label 6750 5000 0 50 ~ 0 SYSA11 Text Label 6750 5100 0 50 ~ 0 SYSA12 Text Label 6750 5200 0 50 ~ 0 SYSA13 Text Label 6750 5300 0 50 ~ 0 SYSA14 $Comp L Device:R R4 U 1 1 60E87D8E P 7200 5100 F 0 "R4" V 7200 4850 50 0000 C CNN F 1 "4K7" V 7200 5100 50 0000 C CNN F 2 "Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder" V 7130 5100 50 0001 C CNN F 3 "~" H 7200 5100 50 0001 C CNN 1 7200 5100 0 -1 1 0 $EndComp $Comp L Device:R R5 U 1 1 60E87FB4 P 7200 5200 F 0 "R5" V 7200 4950 50 0000 C CNN F 1 "4K7" V 7200 5200 50 0000 C CNN F 2 "Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder" V 7130 5200 50 0001 C CNN F 3 "~" H 7200 5200 50 0001 C CNN 1 7200 5200 0 -1 1 0 $EndComp $Comp L Device:R R6 U 1 1 60E8815F P 7200 5300 F 0 "R6" V 7200 5050 50 0000 C CNN F 1 "4K7" V 7200 5300 50 0000 C CNN F 2 "Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder" V 7130 5300 50 0001 C CNN F 3 "~" H 7200 5300 50 0001 C CNN 1 7200 5300 0 -1 1 0 $EndComp $Comp L power:GND #PWR031 U 1 1 60E8A6A5 P 7350 5350 F 0 "#PWR031" H 7350 5100 50 0001 C CNN F 1 "GND" H 7350 5200 50 0000 C CNN F 2 "" H 7350 5350 50 0001 C CNN F 3 "" H 7350 5350 50 0001 C CNN 1 7350 5350 -1 0 0 -1 $EndComp Wire Wire Line 7350 5350 7350 5300 Connection ~ 7350 5100 Wire Wire Line 7350 5100 7350 5000 Connection ~ 7350 5200 Wire Wire Line 7350 5200 7350 5100 Connection ~ 7350 5300 Wire Wire Line 7350 5300 7350 5200 NoConn ~ 2800 2950 Connection ~ 3500 3350 Wire Wire Line 3500 3450 3500 3350 Wire Wire Line 3650 3450 3500 3450 Wire Wire Line 3500 1750 3500 1950 Wire Wire Line 3500 1650 3500 1750 Connection ~ 3500 1750 Wire Wire Line 3650 1750 3500 1750 Text Notes 1250 1200 0 50 ~ 0 Note: firmware drives ~SS~ high when not in\nprogramming mode (PGM low) to avoid contention\nwhen the system drives the address bus. $Comp L Device:R R7 U 1 1 60FC7770 P 3350 2950 F 0 "R7" H 3400 3100 50 0000 C CNN F 1 "4K7" V 3350 2950 50 0000 C CNN F 2 "Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder" V 3280 2950 50 0001 C CNN F 3 "~" H 3350 2950 50 0001 C CNN 1 3350 2950 1 0 0 1 $EndComp Wire Wire Line 3350 3150 3350 3100 Wire Wire Line 2800 3150 3350 3150 $Comp L power:VCC #PWR032 U 1 1 60FE6889 P 3350 2800 F 0 "#PWR032" H 3350 2650 50 0001 C CNN F 1 "VCC" H 3350 2950 50 0000 C CNN F 2 "" H 3350 2800 50 0001 C CNN F 3 "" H 3350 2800 50 0001 C CNN 1 3350 2800 1 0 0 -1 $EndComp Wire Wire Line 3300 3550 2800 3550 Wire Wire Line 3350 3450 2800 3450 Wire Wire Line 3350 3450 3350 5200 Wire Wire Line 5550 6850 6400 6850 Wire Wire Line 6300 4850 6300 4750 Connection ~ 6300 4750 Wire Wire Line 6050 6550 6050 6450 Connection ~ 6050 6450 Wire Wire Line 6700 3050 6700 2950 $Comp L Diode:1N4148 D3 U 1 1 5F8C7D7E P 6250 3300 F 0 "D3" V 6350 3150 50 0000 L CNN F 1 "1N4148" H 6000 3200 50 0000 L CNN F 2 "Diode_SMD:D_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 6250 3125 50 0001 C CNN F 3 "https://assets.nexperia.com/documents/data-sheet/1N4148_1N4448.pdf" H 6250 3300 50 0001 C CNN 1 6250 3300 0 1 1 0 $EndComp $Comp L Diode:1N4148 D4 U 1 1 5F89552F P 6450 3300 F 0 "D4" V 6550 3300 50 0000 L CNN F 1 "1N4148" H 6200 3200 50 0000 L CNN F 2 "Diode_SMD:D_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 6450 3125 50 0001 C CNN F 3 "https://assets.nexperia.com/documents/data-sheet/1N4148_1N4448.pdf" H 6450 3300 50 0001 C CNN 1 6450 3300 0 1 1 0 $EndComp Connection ~ 6700 3050 Text Label 6550 3550 0 50 ~ 0 ~SYSCS Text Label 6550 3650 0 50 ~ 0 ~SYSOE Wire Wire Line 6800 3550 6450 3550 Wire Wire Line 6450 3550 6450 3450 Wire Wire Line 6800 3650 6250 3650 Wire Wire Line 6250 3650 6250 3450 Wire Wire Line 6250 3150 6250 3050 Wire Wire Line 6250 3050 6450 3050 Wire Wire Line 6450 3150 6450 3050 Connection ~ 6450 3050 Wire Wire Line 6450 3050 6700 3050 Wire Wire Line 6700 3350 6700 3050 $Comp L Device:R R8 U 1 1 5FB4A123 P 6950 3350 F 0 "R8" V 7050 3350 50 0000 C CNN F 1 "4K7" V 6950 3350 50 0000 C CNN F 2 "Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder" V 6880 3350 50 0001 C CNN F 3 "~" H 6950 3350 50 0001 C CNN 1 6950 3350 0 -1 1 0 $EndComp Wire Wire Line 6800 3350 6700 3350 Wire Wire Line 7100 3350 7200 3350 Wire Bus Line 8100 1500 8100 2650 Wire Bus Line 3250 650 3250 4250 Wire Bus Line 6400 650 6400 2650 Wire Bus Line 10350 1500 10350 4900 Wire Bus Line 6650 3950 6650 6450 Wire Bus Line 8650 2100 8650 6450 Wire Bus Line 4750 1250 4750 6150 Connection ~ 7200 3350 $EndSCHEMATC