analog input pin protection

AlexSleepy · Oct 8, 2022 · 428a7de · 428a7de
1 parent cc717a7
commit 428a7de
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Showing 2 changed files with 74 additions and 4 deletions.
diff --git a/clock/clock/clock-cache.lib b/clock/clock/clock-cache.lib
@@ -166,6 +166,26 @@ X ~ 2 0 -150 50 U 50 50 1 1 P
 ENDDRAW
 ENDDEF
 #
+# Diode_1N4148
+#
+DEF Diode_1N4148 D 0 40 N N 1 F N
+F0 "D" 0 100 50 H V C CNN
+F1 "Diode_1N4148" 0 -100 50 H V C CNN
+F2 "Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal" 0 -175 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+ALIAS 1N4448 1N4149 1N4151 1N914 BA243 BA244 BA282 BA283 BAV17 BAV18 BAV19 BAV20 BAV21 BAW75 BAW76 BAY93
+$FPLIST
+ D*DO?35*
+$ENDFPLIST
+DRAW
+P 2 0 1 10 -50 50 -50 -50 N
+P 2 0 1 0 50 0 -50 0 N
+P 4 0 1 10 50 50 50 -50 -50 0 50 50 N
+X K 1 -150 0 100 R 50 50 1 1 P
+X A 2 150 0 100 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
 # MCU_Microchip_ATmega_ATmega328P-PU
 #
 DEF MCU_Microchip_ATmega_ATmega328P-PU U 0 20 Y Y 1 F N

diff --git a/clock/clock/clock.sch b/clock/clock/clock.sch
@@ -683,10 +683,8 @@ F 3 "~" H 6750 5200 50  0001 C CNN
 	1    6750 5200
 	1    0    0    1   
 $EndComp
-Text Label 7150 5200 0    50   ~ 0
+Text Label 8150 5700 0    50   ~ 0
 CV_IN
-Wire Wire Line
-	7150 5200 6950 5200
 Text Label 2700 3650 0    50   ~ 0
 B_CV_IN
 Text Label 2700 2950 0    50   ~ 0
@@ -1195,7 +1193,7 @@ Text Label 6250 3400 1    50   ~ 0
 AVCC
 Text Label 5250 6250 3    50   ~ 0
 AGND
-Text Label 7150 5300 0    50   ~ 0
+Text Label 7850 6200 0    50   ~ 0
 AGND
 Text Label 5250 5200 1    50   ~ 0
 AVCC
@@ -1355,4 +1353,56 @@ Text Label 7150 5100 0    50   ~ 0
 AGND
 Wire Wire Line
 	7150 5100 6950 5100
+$Comp
+L Diode:1N4148 D?
+U 1 1 6342DA40
+P 7600 5200
+F 0 "D?" H 7600 4983 50  0000 C CNN
+F 1 "1N4148" H 7600 5074 50  0000 C CNN
+F 2 "Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal" H 7600 5025 50  0001 C CNN
+F 3 "https://assets.nexperia.com/documents/data-sheet/1N4148_1N4448.pdf" H 7600 5200 50  0001 C CNN
+	1    7600 5200
+	-1   0    0    1   
+$EndComp
+$Comp
+L Device:R R?
+U 1 1 6342F08D
+P 7850 5450
+F 0 "R?" H 7920 5496 50  0000 L CNN
+F 1 "180K" H 7920 5405 50  0000 L CNN
+F 2 "" V 7780 5450 50  0001 C CNN
+F 3 "~" H 7850 5450 50  0001 C CNN
+	1    7850 5450
+	1    0    0    -1  
+$EndComp
+$Comp
+L Device:R R?
+U 1 1 6342F86A
+P 7850 5900
+F 0 "R?" H 7920 5946 50  0000 L CNN
+F 1 "100K" H 7920 5855 50  0000 L CNN
+F 2 "" V 7780 5900 50  0001 C CNN
+F 3 "~" H 7850 5900 50  0001 C CNN
+	1    7850 5900
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	7850 6200 7850 6050
+Wire Wire Line
+	7850 5750 7850 5700
+Wire Wire Line
+	7850 5300 7850 5200
+Wire Wire Line
+	7850 5200 7750 5200
+Wire Wire Line
+	6950 5200 7450 5200
+Wire Wire Line
+	8150 5700 7850 5700
+Connection ~ 7850 5700
+Wire Wire Line
+	7850 5700 7850 5600
+Text Label 7150 5300 0    50   ~ 0
+AGND
+Text Notes 7800 5150 0    50   ~ 0
+bound input CV to 0-5V
 $EndSCHEMATC