1 EESchema Schematic File Version 4
7 Title "ROM development board"
13 Comment3 "License: Creative Commons Attribution Share-Alike (CC BY-SA)"
14 Comment4 "Copyright (C) 2020 John Tsiombikas <nuclear@member.fsf.org>"
17 L Connector:USB_B_Micro J2
20 F 0 "J2" H 1370 5089 50 0000 R CNN
21 F 1 "USB_B_Micro" H 1370 4998 50 0000 R CNN
22 F 2 "Connector_USB:USB_Micro-B_Molex-105017-0001" H 1750 5050 50 0001 C CNN
23 F 3 "~" H 1750 5050 50 0001 C CNN
28 L Device:Crystal_Small Y1
31 F 0 "Y1" V 1550 2350 50 0000 R CNN
32 F 1 "14.7456" V 1700 2600 50 0000 R CNN
33 F 2 "Crystal:Crystal_SMD_ECS_CSM3X-2Pin_7.6x4.1mm" H 1550 2450 50 0001 C CNN
34 F 3 "~" H 1550 2450 50 0001 C CNN
42 F 0 "#PWR02" H 1100 2300 50 0001 C CNN
43 F 1 "GND" H 1100 2400 50 0000 C CNN
44 F 2 "" H 1100 2550 50 0001 C CNN
45 F 3 "" H 1100 2550 50 0001 C CNN
53 F 0 "C2" V 1250 2450 50 0000 C CNN
54 F 1 "22pF" V 1450 2550 50 0000 C CNN
55 F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 1300 2550 50 0001 C CNN
56 F 3 "~" H 1300 2550 50 0001 C CNN
64 F 0 "C1" V 1350 2250 50 0000 C CNN
65 F 1 "22pF" V 1450 2350 50 0000 C CNN
66 F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 1300 2350 50 0001 C CNN
67 F 3 "~" H 1300 2350 50 0001 C CNN
72 L romdev:sram_um61512ak U6
75 F 0 "U6" H 5650 3250 60 0000 C CNN
76 F 1 "sram_um61512ak" V 5550 2200 60 0000 C CNN
77 F 2 "Package_DIP:DIP-32_W7.62mm" H 5450 1350 60 0001 C CNN
78 F 3 "" H 5450 1350 60 0000 C CNN
86 F 0 "U4" H 4150 2100 50 0000 C CNN
87 F 1 "74HCT595" H 3800 900 50 0000 C CNN
88 F 2 "Package_SO:SOIC-16_3.9x9.9mm_P1.27mm" H 4050 1550 50 0001 C CNN
89 F 3 "http://www.ti.com/lit/gpn/sn74ls595" H 4050 1550 50 0001 C CNN
97 F 0 "U2" H 2800 6000 50 0000 C CNN
98 F 1 "mcp2221" V 2700 5500 50 0000 C CNN
99 F 2 "Package_SO:SOIC-14_3.9x8.7mm_P1.27mm" H 2700 5200 50 0001 C CNN
100 F 3 "" H 2700 5200 50 0001 C CNN
118 F 0 "#PWR08" H 2700 4700 50 0001 C CNN
119 F 1 "VCC" H 2700 5000 50 0000 C CNN
120 F 2 "" H 2700 4850 50 0001 C CNN
121 F 3 "" H 2700 4850 50 0001 C CNN
125 Connection ~ 2700 4850
130 F 0 "#PWR09" H 2700 5900 50 0001 C CNN
131 F 1 "GND" H 2700 6000 50 0000 C CNN
132 F 2 "" H 2700 6150 50 0001 C CNN
133 F 3 "" H 2700 6150 50 0001 C CNN
141 F 0 "C4" H 2050 6100 50 0000 R CNN
142 F 1 "0.1uF" H 2200 6200 50 0000 R CNN
143 F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 2150 6050 50 0001 C CNN
144 F 3 "~" H 2150 6050 50 0001 C CNN
148 Connection ~ 2700 6150
153 F 0 "C3" H 1900 6100 50 0000 R CNN
154 F 1 "0.1uF" H 2050 6200 50 0000 R CNN
155 F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 2000 6050 50 0001 C CNN
156 F 3 "~" H 2000 6050 50 0001 C CNN
162 Connection ~ 2150 6150
171 Connection ~ 2150 5900
179 F 0 "#PWR05" H 1600 5250 50 0001 C CNN
180 F 1 "GND" H 1600 5350 50 0000 C CNN
181 F 2 "" H 1600 5500 50 0001 C CNN
182 F 3 "" H 1600 5500 50 0001 C CNN
202 F 0 "D2" H 1250 6100 50 0000 C CNN
203 F 1 "TxLED" H 1250 6000 50 0000 C CNN
204 F 2 "LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 1250 5900 50 0001 C CNN
205 F 3 "~" H 1250 5900 50 0001 C CNN
213 F 0 "D1" H 1250 5550 50 0000 C CNN
214 F 1 "RxLED" H 1250 5650 50 0000 C CNN
215 F 2 "LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 1250 5750 50 0001 C CNN
216 F 3 "~" H 1250 5750 50 0001 C CNN
224 F 0 "#PWR01" H 750 5500 50 0001 C CNN
225 F 1 "VCC" H 750 5800 50 0000 C CNN
226 F 2 "" H 750 5650 50 0001 C CNN
227 F 3 "" H 750 5650 50 0001 C CNN
235 F 0 "R1" V 800 5750 50 0000 C CNN
236 F 1 "330R" V 900 5750 50 0000 C CNN
237 F 2 "Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder" V 830 5750 50 0001 C CNN
238 F 3 "~" H 900 5750 50 0001 C CNN
246 F 0 "R2" V 800 5900 50 0000 C CNN
247 F 1 "330R" V 900 5900 50 0000 C CNN
248 F 2 "Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder" V 830 5900 50 0001 C CNN
249 F 3 "~" H 900 5900 50 0001 C CNN
259 Connection ~ 750 5750
268 Text Label 3400 5650 2 50 ~ 0
270 Text Label 2850 3150 0 50 ~ 0
286 Text Label 2850 3650 0 50 ~ 0
288 Text Label 2850 3750 0 50 ~ 0
290 Text Label 2850 3850 0 50 ~ 0
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304 F 0 "U9" H 7300 3200 50 0000 C CNN
305 F 1 "74HCT244" H 7400 1900 50 0000 C CNN
306 F 2 "Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm" H 7200 2550 50 0001 C CNN
307 F 3 "https://assets.nexperia.com/documents/data-sheet/74HC_HCT244.pdf" H 7200 2550 50 0001 C CNN
311 Text Label 2850 1850 0 50 ~ 0
313 Text Label 2850 1750 0 50 ~ 0
320 L romdev:ATmega328P-AU U1
323 F 0 "U1" H 2350 1500 50 0000 C CNN
324 F 1 "ATmega328P-AU" V 2050 2750 50 0000 C CNN
325 F 2 "Package_QFP:TQFP-32_7x7mm_P0.8mm" H 2200 3050 50 0001 C CIN
326 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
336 Connection ~ 1550 2350
339 Connection ~ 1550 2550
346 Connection ~ 1100 2550
354 F 0 "#PWR06" H 2200 1300 50 0001 C CNN
355 F 1 "VCC" H 2200 1600 50 0000 C CNN
356 F 2 "" H 2200 1450 50 0001 C CNN
357 F 3 "" H 2200 1450 50 0001 C CNN
363 Connection ~ 2200 1450
368 F 0 "#PWR07" H 2200 4200 50 0001 C CNN
369 F 1 "GND" H 2200 4300 50 0000 C CNN
370 F 2 "" H 2200 4450 50 0001 C CNN
371 F 3 "" H 2200 4450 50 0001 C CNN
395 F 0 "#PWR013" H 4050 800 50 0001 C CNN
396 F 1 "VCC" H 4050 1100 50 0000 C CNN
397 F 2 "" H 4050 950 50 0001 C CNN
398 F 3 "" H 4050 950 50 0001 C CNN
406 F 0 "#PWR014" H 4050 2000 50 0001 C CNN
407 F 1 "GND" H 4050 2100 50 0000 C CNN
408 F 2 "" H 4050 2250 50 0001 C CNN
409 F 3 "" H 4050 2250 50 0001 C CNN
417 F 0 "U5" H 4150 3800 50 0000 C CNN
418 F 1 "74HCT595" H 3800 2600 50 0000 C CNN
419 F 2 "Package_SO:SOIC-16_3.9x9.9mm_P1.27mm" H 4050 3250 50 0001 C CNN
420 F 3 "http://www.ti.com/lit/gpn/sn74ls595" H 4050 3250 50 0001 C CNN
428 F 0 "#PWR015" H 4050 2500 50 0001 C CNN
429 F 1 "VCC" H 4050 2800 50 0000 C CNN
430 F 2 "" H 4050 2650 50 0001 C CNN
431 F 3 "" H 4050 2650 50 0001 C CNN
439 F 0 "#PWR016" H 4050 3700 50 0001 C CNN
440 F 1 "GND" H 4050 3800 50 0000 C CNN
441 F 2 "" H 4050 3950 50 0001 C CNN
442 F 3 "" H 4050 3950 50 0001 C CNN
454 Connection ~ 3450 2250
461 Connection ~ 3500 1950
468 Connection ~ 4050 950
475 Connection ~ 4050 2650
476 Text Label 4500 1150 0 50 ~ 0
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585 F 0 "U8" H 5700 5000 50 0000 C CNN
586 F 1 "74HCT244" H 5600 3700 50 0000 C CNN
587 F 2 "Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm" H 5800 4350 50 0001 C CNN
588 F 3 "https://assets.nexperia.com/documents/data-sheet/74HC_HCT244.pdf" H 5800 4350 50 0001 C CNN
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762 F 0 "#PWR022" H 5800 3400 50 0001 C CNN
763 F 1 "VCC" H 5800 3700 50 0000 C CNN
764 F 2 "" H 5800 3550 50 0001 C CNN
765 F 3 "" H 5800 3550 50 0001 C CNN
773 F 0 "#PWR023" H 5800 4900 50 0001 C CNN
774 F 1 "GND" H 5800 5000 50 0000 C CNN
775 F 2 "" H 5800 5150 50 0001 C CNN
776 F 3 "" H 5800 5150 50 0001 C CNN
784 F 0 "#PWR019" H 5550 3200 50 0001 C CNN
785 F 1 "GND" H 5550 3300 50 0000 C CNN
786 F 2 "" H 5550 3450 50 0001 C CNN
787 F 3 "" H 5550 3450 50 0001 C CNN
795 F 0 "#PWR018" H 5550 750 50 0001 C CNN
796 F 1 "VCC" H 5550 1050 50 0000 C CNN
797 F 2 "" H 5550 900 50 0001 C CNN
798 F 3 "" H 5550 900 50 0001 C CNN
806 F 0 "U7" H 5450 6700 50 0000 C CNN
807 F 1 "74HCT244" H 5350 5400 50 0000 C CNN
808 F 2 "Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm" H 5550 6050 50 0001 C CNN
809 F 3 "https://assets.nexperia.com/documents/data-sheet/74HC_HCT244.pdf" H 5550 6050 50 0001 C CNN
817 F 0 "#PWR020" H 5550 5100 50 0001 C CNN
818 F 1 "VCC" H 5550 5400 50 0000 C CNN
819 F 2 "" H 5550 5250 50 0001 C CNN
820 F 3 "" H 5550 5250 50 0001 C CNN
828 F 0 "#PWR021" H 5550 6600 50 0001 C CNN
829 F 1 "GND" H 5550 6700 50 0000 C CNN
830 F 2 "" H 5550 6850 50 0001 C CNN
831 F 3 "" H 5550 6850 50 0001 C CNN
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1061 F 0 "#PWR026" H 7200 1600 50 0001 C CNN
1062 F 1 "VCC" H 7200 1900 50 0000 C CNN
1063 F 2 "" H 7200 1750 50 0001 C CNN
1064 F 3 "" H 7200 1750 50 0001 C CNN
1072 F 0 "#PWR027" H 7200 3100 50 0001 C CNN
1073 F 1 "GND" H 7200 3200 50 0000 C CNN
1074 F 2 "" H 7200 3350 50 0001 C CNN
1075 F 3 "" H 7200 3350 50 0001 C CNN
1080 L Connector:AVR-ISP-6 J1
1083 F 0 "J1" H 1221 7096 50 0000 R CNN
1084 F 1 "AVR-ISP" H 1221 7005 50 0000 R CNN
1085 F 2 "Connector_IDC:IDC-Header_2x03_P2.54mm_Vertical" V 1300 7050 50 0001 C CNN
1086 F 3 " ~" H 275 6450 50 0001 C CNN
1094 F 0 "#PWR03" H 1450 6350 50 0001 C CNN
1095 F 1 "VCC" H 1450 6650 50 0000 C CNN
1096 F 2 "" H 1450 6500 50 0001 C CNN
1097 F 3 "" H 1450 6500 50 0001 C CNN
1101 Text Label 2850 2250 0 50 ~ 0
1105 Text Label 2850 2150 0 50 ~ 0
1107 Text Label 2850 2050 0 50 ~ 0
1115 F 0 "#PWR04" H 1450 7150 50 0001 C CNN
1116 F 1 "GND" H 1450 7250 50 0000 C CNN
1117 F 2 "" H 1450 7400 50 0001 C CNN
1118 F 3 "" H 1450 7400 50 0001 C CNN
1130 Text Label 2000 6800 0 50 ~ 0
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1134 Text Label 2000 7000 0 50 ~ 0
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1141 L romdev:conn32k U11
1144 F 0 "U11" H 9600 5950 50 0000 C CNN
1145 F 1 "conn32k" V 9500 5100 50 0000 C CNN
1146 F 2 "romdev:conn32k" H 9500 5050 50 0001 C CNN
1147 F 3 "" H 9500 5050 50 0001 C CNN
1161 F 0 "U10" H 9600 3350 50 0000 C CNN
1162 F 1 "conn2k" V 9500 2600 50 0000 C CNN
1163 F 2 "romdev:conn2k" H 9500 2450 50 0001 C CNN
1164 F 3 "" H 9500 2450 50 0001 C CNN
1172 F 0 "#PWR028" H 9500 3250 50 0001 C CNN
1173 F 1 "GND" H 9500 3350 50 0000 C CNN
1174 F 2 "" H 9500 3500 50 0001 C CNN
1175 F 3 "" H 9500 3500 50 0001 C CNN
1183 F 0 "#PWR029" H 9500 5750 50 0001 C CNN
1184 F 1 "GND" H 9500 5850 50 0000 C CNN
1185 F 2 "" H 9500 6000 50 0001 C CNN
1186 F 3 "" H 9500 6000 50 0001 C CNN
1194 F 0 "JP1" V 10504 1526 50 0000 L CNN
1195 F 1 "VCCOUT" V 10595 1526 50 0000 L CNN
1196 F 2 "Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical" H 10550 1400 50 0001 C CNN
1197 F 3 "~" H 10550 1400 50 0001 C CNN
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1523 F 0 "#PWR030" H 10550 950 50 0001 C CNN
1524 F 1 "VCC" H 10550 1250 50 0000 C CNN
1525 F 2 "" H 10550 1100 50 0001 C CNN
1526 F 3 "" H 10550 1100 50 0001 C CNN
1531 10550 1700 9500 1700
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1536 Connection ~ 10550 1700
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1575 F 0 "U3" H 4000 7300 50 0000 C CNN
1576 F 1 "74HCT157" V 3900 6550 50 0000 C CNN
1577 F 2 "Package_SO:SOIC-16_4.55x10.3mm_P1.27mm" H 3900 6550 50 0001 C CNN
1578 F 3 "http://www.ti.com/lit/gpn/sn74LS157" H 3900 6550 50 0001 C CNN
1586 F 0 "#PWR011" H 3900 5500 50 0001 C CNN
1587 F 1 "VCC" H 3900 5800 50 0000 C CNN
1588 F 2 "" H 3900 5650 50 0001 C CNN
1589 F 3 "" H 3900 5650 50 0001 C CNN
1597 F 0 "#PWR012" H 3900 7300 50 0001 C CNN
1598 F 1 "GND" H 3900 7400 50 0000 C CNN
1599 F 2 "" H 3900 7550 50 0001 C CNN
1600 F 3 "" H 3900 7550 50 0001 C CNN
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1658 F 0 "#PWR017" H 4900 3150 50 0001 C CNN
1659 F 1 "VCC" H 4900 3450 50 0000 C CNN
1660 F 2 "" H 4900 3300 50 0001 C CNN
1661 F 3 "" H 4900 3300 50 0001 C CNN
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1698 F 0 "#PWR010" H 3200 6300 50 0001 C CNN
1699 F 1 "GND" H 3200 6400 50 0000 C CNN
1700 F 2 "" H 3200 6550 50 0001 C CNN
1701 F 3 "" H 3200 6550 50 0001 C CNN
1707 Connection ~ 3400 6650
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1715 Connection ~ 3400 6550
1720 Connection ~ 3900 7550
1725 F 0 "C5" H 6950 1150 50 0000 L CNN
1726 F 1 "0.1uF" H 6900 750 50 0000 L CNN
1727 F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 7038 800 50 0001 C CNN
1728 F 3 "~" H 7000 950 50 0001 C CNN
1736 F 0 "C6" H 7200 1150 50 0000 L CNN
1737 F 1 "0.1uF" H 7150 750 50 0000 L CNN
1738 F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 7288 800 50 0001 C CNN
1739 F 3 "~" H 7250 950 50 0001 C CNN
1747 F 0 "C7" H 7450 1150 50 0000 L CNN
1748 F 1 "0.1uF" H 7400 750 50 0000 L CNN
1749 F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 7538 800 50 0001 C CNN
1750 F 3 "~" H 7500 950 50 0001 C CNN
1758 F 0 "C8" H 7700 1150 50 0000 L CNN
1759 F 1 "0.1uF" H 7650 750 50 0000 L CNN
1760 F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 7788 800 50 0001 C CNN
1761 F 3 "~" H 7750 950 50 0001 C CNN
1769 F 0 "C9" H 7950 1150 50 0000 L CNN
1770 F 1 "0.1uF" H 7900 750 50 0000 L CNN
1771 F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 8038 800 50 0001 C CNN
1772 F 3 "~" H 8000 950 50 0001 C CNN
1780 F 0 "C10" H 8200 1150 50 0000 L CNN
1781 F 1 "0.1uF" H 8150 750 50 0000 L CNN
1782 F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 8288 800 50 0001 C CNN
1783 F 3 "~" H 8250 950 50 0001 C CNN
1791 F 0 "C11" H 8450 1150 50 0000 L CNN
1792 F 1 "0.1uF" H 8400 750 50 0000 L CNN
1793 F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 8538 800 50 0001 C CNN
1794 F 3 "~" H 8500 950 50 0001 C CNN
1802 F 0 "C12" H 8700 1150 50 0000 L CNN
1803 F 1 "0.1uF" H 8650 750 50 0000 L CNN
1804 F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 8788 800 50 0001 C CNN
1805 F 3 "~" H 8750 950 50 0001 C CNN
1813 F 0 "C13" H 8950 1150 50 0000 L CNN
1814 F 1 "0.1uF" H 8900 750 50 0000 L CNN
1815 F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 9038 800 50 0001 C CNN
1816 F 3 "~" H 9000 950 50 0001 C CNN
1824 F 0 "#PWR025" H 6850 850 50 0001 C CNN
1825 F 1 "GND" H 6850 950 50 0000 C CNN
1826 F 2 "" H 6850 1100 50 0001 C CNN
1827 F 3 "" H 6850 1100 50 0001 C CNN
1835 F 0 "#PWR024" H 6850 650 50 0001 C CNN
1836 F 1 "VCC" H 6850 950 50 0000 C CNN
1837 F 2 "" H 6850 800 50 0001 C CNN
1838 F 3 "" H 6850 800 50 0001 C CNN
1844 Connection ~ 7000 800
1847 Connection ~ 7250 800
1850 Connection ~ 7500 800
1853 Connection ~ 7750 800
1856 Connection ~ 8000 800
1859 Connection ~ 8250 800
1862 Connection ~ 8500 800
1865 Connection ~ 8750 800
1870 Connection ~ 7000 1100
1873 Connection ~ 7250 1100
1876 Connection ~ 7500 1100
1879 Connection ~ 7750 1100
1882 Connection ~ 8000 1100
1885 Connection ~ 8250 1100
1888 Connection ~ 8500 1100
1891 Connection ~ 8750 1100
1894 Text Notes 7750 650 0 50 ~ 0
1896 Connection ~ 6050 6850
1898 Text Label 2800 3050 0 50 ~ 0
1901 L Connector:Conn_01x01_Male J7
1904 F 0 "J7" V 3100 2700 50 0000 L CNN
1905 F 1 "SYSRST" H 3150 2800 50 0000 L CNN
1906 F 2 "Connector_PinSocket_2.54mm:PinSocket_1x01_P2.54mm_Vertical" H 3150 2750 50 0001 C CNN
1907 F 3 "~" H 3150 2750 50 0001 C CNN
1919 F 0 "R3" V 7200 4750 50 0000 C CNN
1920 F 1 "4K7" V 7200 5000 50 0000 C CNN
1921 F 2 "Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder" V 7130 5000 50 0001 C CNN
1922 F 3 "~" H 7200 5000 50 0001 C CNN
1950 Text Label 6750 5000 0 50 ~ 0
1952 Text Label 6750 5100 0 50 ~ 0
1954 Text Label 6750 5200 0 50 ~ 0
1956 Text Label 6750 5300 0 50 ~ 0
1962 F 0 "R4" V 7200 4850 50 0000 C CNN
1963 F 1 "4K7" V 7200 5100 50 0000 C CNN
1964 F 2 "Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder" V 7130 5100 50 0001 C CNN
1965 F 3 "~" H 7200 5100 50 0001 C CNN
1973 F 0 "R5" V 7200 4950 50 0000 C CNN
1974 F 1 "4K7" V 7200 5200 50 0000 C CNN
1975 F 2 "Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder" V 7130 5200 50 0001 C CNN
1976 F 3 "~" H 7200 5200 50 0001 C CNN
1984 F 0 "R6" V 7200 5050 50 0000 C CNN
1985 F 1 "4K7" V 7200 5300 50 0000 C CNN
1986 F 2 "Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder" V 7130 5300 50 0001 C CNN
1987 F 3 "~" H 7200 5300 50 0001 C CNN
1995 F 0 "#PWR031" H 7350 5100 50 0001 C CNN
1996 F 1 "GND" H 7350 5200 50 0000 C CNN
1997 F 2 "" H 7350 5350 50 0001 C CNN
1998 F 3 "" H 7350 5350 50 0001 C CNN
2004 Connection ~ 7350 5100
2007 Connection ~ 7350 5200
2010 Connection ~ 7350 5300
2014 Connection ~ 3500 3350
2023 Connection ~ 3500 1750
2026 Text Notes 1250 1200 0 50 ~ 0
2027 Note: firmware drives ~SS~ high when not in\nprogramming mode (PGM low) to avoid contention\nwhen the system drives the address bus.
2032 F 0 "R7" H 3400 3100 50 0000 C CNN
2033 F 1 "4K7" V 3350 2950 50 0000 C CNN
2034 F 2 "Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder" V 3280 2950 50 0001 C CNN
2035 F 3 "~" H 3350 2950 50 0001 C CNN
2050 10350 1500 10350 4900
2061 F 0 "#PWR032" H 3350 2650 50 0001 C CNN
2062 F 1 "VCC" H 3350 2950 50 0000 C CNN
2063 F 2 "" H 3350 2800 50 0001 C CNN
2064 F 3 "" H 3350 2800 50 0001 C CNN