MAX driver protection

* Adjust label position for readability
* Protected R1OUT-R3OUT of MAX driver with OR gate

1 files changed, 503 insertions, 0 deletions

diff --git a/kicad/rs232.sch b/kicad/rs232.sch
new file mode 100644
index 0000000..1307642
--- /dev/null
+++ b/kicad/rs232.sch
@@ -0,0 +1,503 @@
+EESchema Schematic File Version 4
+EELAYER 30 0
+EELAYER END
+$Descr A4 11693 8268
+encoding utf-8
+Sheet 4 5
+Title "cat-a-hack"
+Date ""
+Rev "r2"
+Comp "Vasile Vilvoiu (YO7JBP)"
+Comment1 "CAT and audio hackable isolation board"
+Comment2 "RS232 driver for UART interface"
+Comment3 ""
+Comment4 ""
+$EndDescr
+$Comp
+L Device:C_Small C?
+U 1 1 6072AC90
+P 6250 2100
+AR Path="/6072AC90" Ref="C?"  Part="1" 
+AR Path="/5F9E7705/6072AC90" Ref="C?"  Part="1" 
+AR Path="/5F9E7705/606D9B1D/6072AC90" Ref="C16"  Part="1" 
+F 0 "C16" V 6350 2100 50  0000 C CNN
+F 1 "100n" V 6150 2100 50  0000 C CNN
+F 2 "" H 6250 2100 50  0001 C CNN
+F 3 "~" H 6250 2100 50  0001 C CNN
+	1    6250 2100
+	0    -1   -1   0   
+$EndComp
+Text GLabel 6550 2500 2    50   Input ~ 0
+XCVR_GND
+$Comp
+L Device:C_Small C?
+U 1 1 6072AC97
+P 6250 2500
+AR Path="/6072AC97" Ref="C?"  Part="1" 
+AR Path="/5F9E7705/6072AC97" Ref="C?"  Part="1" 
+AR Path="/5F9E7705/606D9B1D/6072AC97" Ref="C17"  Part="1" 
+F 0 "C17" V 6350 2500 50  0000 C CNN
+F 1 "100n" V 6150 2500 50  0000 C CNN
+F 2 "" H 6250 2500 50  0001 C CNN
+F 3 "~" H 6250 2500 50  0001 C CNN
+	1    6250 2500
+	0    -1   -1   0   
+$EndComp
+Wire Wire Line
+	6450 2100 6350 2100
+Wire Wire Line
+	6450 2500 6350 2500
+$Comp
+L custom:MAX3387ECUG+ U?
+U 1 1 6072ACA5
+P 4500 2100
+AR Path="/5F9E7705/6072ACA5" Ref="U?"  Part="1" 
+AR Path="/5F9E7705/606D9B1D/6072ACA5" Ref="U8"  Part="1" 
+F 0 "U8" H 5250 1600 50  0000 C CNN
+F 1 "MAX3387ECUG+" H 5250 1500 50  0000 C CNN
+F 2 "SOP65P640X110-24N" H 7900 2100 50  0001 L CNN
+F 3 "" H 6300 2700 50  0001 L CNN
+F 4 "MAX3387ECUG+, Multichannel Line Transceiver, EIA/TIA-232, RS-232, V.24, V.28 3 3 3 250kbit/s, 3  5.5 V, 24-Pin" H 7850 1750 50  0001 L CNN "Description"
+F 5 "1.1" H 6300 2500 50  0001 L CNN "Height"
+F 6 "700-MAX3387ECUG" H 7900 2200 50  0001 L CNN "Mouser Part Number"
+F 7 "https://www.mouser.co.uk/ProductDetail/Maxim-Integrated/MAX3387ECUG%2b?qs=1THa7WoU59HIOZvt2U3ItQ%3D%3D" H 7850 1450 50  0001 L CNN "Mouser Price/Stock"
+F 8 "Maxim Integrated" H 7900 2000 50  0001 L CNN "Manufacturer_Name"
+F 9 "MAX3387ECUG+" H 7900 1900 50  0001 L CNN "Manufacturer_Part_Number"
+	1    4500 2100
+	1    0    0    -1  
+$EndComp
+Text Notes 800  900  0    157  ~ 31
+RS232 line driver
+$Comp
+L Device:C_Small C?
+U 1 1 6072ACAC
+P 4200 2100
+AR Path="/6072ACAC" Ref="C?"  Part="1" 
+AR Path="/5F9E7705/6072ACAC" Ref="C?"  Part="1" 
+AR Path="/5F9E7705/606D9B1D/6072ACAC" Ref="C14"  Part="1" 
+F 0 "C14" V 4150 2000 50  0000 C CNN
+F 1 "100n" V 4150 2250 50  0000 C CNN
+F 2 "" H 4200 2100 50  0001 C CNN
+F 3 "~" H 4200 2100 50  0001 C CNN
+	1    4200 2100
+	0    1    1    0   
+$EndComp
+Wire Wire Line
+	4500 2100 4300 2100
+Wire Wire Line
+	4100 2100 4050 2100
+Wire Wire Line
+	4050 2100 4050 2200
+Wire Wire Line
+	4050 2200 4500 2200
+$Comp
+L Device:C_Small C?
+U 1 1 6072ACB6
+P 4200 2400
+AR Path="/6072ACB6" Ref="C?"  Part="1" 
+AR Path="/5F9E7705/6072ACB6" Ref="C?"  Part="1" 
+AR Path="/5F9E7705/606D9B1D/6072ACB6" Ref="C15"  Part="1" 
+F 0 "C15" V 4150 2300 50  0000 C CNN
+F 1 "100n" V 4150 2550 50  0000 C CNN
+F 2 "" H 4200 2400 50  0001 C CNN
+F 3 "~" H 4200 2400 50  0001 C CNN
+	1    4200 2400
+	0    1    1    0   
+$EndComp
+Wire Wire Line
+	4300 2400 4500 2400
+Wire Wire Line
+	4100 2400 4050 2400
+Wire Wire Line
+	4050 2400 4050 2500
+Wire Wire Line
+	4050 2500 4500 2500
+Wire Wire Line
+	6000 2500 6150 2500
+Wire Wire Line
+	6150 2100 6000 2100
+Wire Wire Line
+	6450 2100 6450 2500
+Wire Wire Line
+	6450 2500 6550 2500
+Connection ~ 6450 2500
+Wire Wire Line
+	5150 4000 5150 4100
+Text GLabel 3900 2700 0    50   Input ~ 0
+XCVR_UART_RX
+Wire Bus Line
+	3900 2700 4000 2700
+Entry Wire Line
+	4000 2950 4100 2850
+Entry Wire Line
+	4000 3050 4100 2950
+Entry Wire Line
+	4000 3150 4100 3050
+Wire Wire Line
+	4100 2850 4500 2850
+Wire Wire Line
+	4100 2950 4500 2950
+Wire Wire Line
+	4100 3050 4500 3050
+Text Label 4100 2850 0    50   ~ 0
+XCVR_RXD
+$Comp
+L Connector_Generic:Conn_01x08 J?
+U 1 1 6072ACCF
+P 7450 4300
+AR Path="/6072ACCF" Ref="J?"  Part="1" 
+AR Path="/5F9E7705/6072ACCF" Ref="J?"  Part="1" 
+AR Path="/5F9E7705/606D9B1D/6072ACCF" Ref="J7"  Part="1" 
+F 0 "J7" H 7350 4700 50  0000 L CNN
+F 1 "XCVR_CAT_RS232" H 6900 3800 50  0000 L CNN
+F 2 "" H 7450 4300 50  0001 C CNN
+F 3 "~" H 7450 4300 50  0001 C CNN
+	1    7450 4300
+	1    0    0    -1  
+$EndComp
+Text GLabel 8000 4800 3    50   Input ~ 0
+XCVR_GND
+Text GLabel 8000 3700 1    50   Input ~ 0
+XCVR_13V8
+Entry Wire Line
+	6600 2850 6700 2950
+Entry Wire Line
+	6600 2950 6700 3050
+Entry Wire Line
+	6600 3050 6700 3150
+Entry Wire Line
+	6600 3300 6700 3400
+Entry Wire Line
+	6600 3400 6700 3500
+Entry Wire Line
+	6600 3500 6700 3600
+Text Label 4100 2950 0    50   ~ 0
+XCVR_CTS
+Text Label 4100 3050 0    50   ~ 0
+XCVR_DSR
+Text Label 6050 3300 0    50   ~ 0
+RS232_TXD
+Text Label 6050 3400 0    50   ~ 0
+RS232_RTS
+Text Label 6050 3500 0    50   ~ 0
+RS232_DTR
+Text Label 6050 2850 0    50   ~ 0
+RS232_RXD
+Text Label 6050 2950 0    50   ~ 0
+RS232_CTS
+Text Label 6050 3050 0    50   ~ 0
+RS232_DSR
+Wire Wire Line
+	6000 2850 6600 2850
+Wire Wire Line
+	6000 2950 6600 2950
+Wire Wire Line
+	6000 3050 6600 3050
+Wire Wire Line
+	6000 3300 6600 3300
+Wire Wire Line
+	6000 3400 6600 3400
+Wire Wire Line
+	6000 3500 6600 3500
+Entry Wire Line
+	6700 4000 6800 4100
+Entry Wire Line
+	6700 4100 6800 4200
+Entry Wire Line
+	6700 4600 6800 4700
+Entry Wire Line
+	6700 4300 6800 4400
+Entry Wire Line
+	6700 4400 6800 4500
+Entry Wire Line
+	6700 4500 6800 4600
+Text Label 6800 4100 0    50   ~ 0
+RS232_TXD
+Text Label 6800 4200 0    50   ~ 0
+RS232_RXD
+Text Label 6800 4400 0    50   ~ 0
+RS232_RTS
+Text Label 6800 4500 0    50   ~ 0
+RS232_CTS
+Text Label 6800 4600 0    50   ~ 0
+RS232_DTR
+Text Label 6800 4700 0    50   ~ 0
+RS232_DSR
+Text GLabel 6850 1650 2    50   Input ~ 0
+XCVR_5V
+$Comp
+L Device:C_Small C?
+U 1 1 6072ACF8
+P 6450 1900
+AR Path="/6072ACF8" Ref="C?"  Part="1" 
+AR Path="/5F9E7705/6072ACF8" Ref="C?"  Part="1" 
+AR Path="/5F9E7705/606D9B1D/6072ACF8" Ref="C18"  Part="1" 
+F 0 "C18" H 6300 1900 50  0000 C CNN
+F 1 "100n" H 6300 2000 50  0000 C CNN
+F 2 "" H 6450 1900 50  0001 C CNN
+F 3 "~" H 6450 1900 50  0001 C CNN
+	1    6450 1900
+	-1   0    0    1   
+$EndComp
+Wire Wire Line
+	6450 2000 6450 2100
+Connection ~ 6450 2100
+Wire Wire Line
+	5150 1700 5150 1650
+Wire Wire Line
+	5150 1650 5250 1650
+Wire Wire Line
+	6450 1650 6450 1800
+Wire Wire Line
+	5250 1700 5250 1650
+Connection ~ 5250 1650
+Wire Wire Line
+	5250 1650 5350 1650
+Wire Wire Line
+	5350 1700 5350 1650
+Connection ~ 5350 1650
+Wire Wire Line
+	5350 1650 6450 1650
+Wire Wire Line
+	6450 1650 6550 1650
+Connection ~ 6450 1650
+Wire Wire Line
+	7650 4300 7650 4250
+Wire Wire Line
+	7650 4050 7650 4000
+$Comp
+L Device:C_Small C?
+U 1 1 6072AD0D
+P 7650 4150
+AR Path="/5F9E817D/6072AD0D" Ref="C?"  Part="1" 
+AR Path="/5F9E7705/6072AD0D" Ref="C?"  Part="1" 
+AR Path="/5F9E7705/606D9B1D/6072AD0D" Ref="C19"  Part="1" 
+F 0 "C19" H 7700 4200 50  0000 L CNN
+F 1 "100n" H 7700 4100 50  0000 L CNN
+F 2 "" H 7650 4150 50  0001 C CNN
+F 3 "~" H 7650 4150 50  0001 C CNN
+	1    7650 4150
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	7650 4000 7250 4000
+Wire Wire Line
+	5350 4000 5350 4400
+Wire Wire Line
+	5350 4400 5250 4400
+Connection ~ 5250 4400
+Wire Wire Line
+	5250 4400 5250 4000
+Wire Wire Line
+	5150 4400 5250 4400
+Wire Wire Line
+	5150 4300 5150 4400
+Text GLabel 5600 4400 2    50   Input ~ 0
+XCVR_GND
+$Comp
+L Device:R_Small R?
+U 1 1 6072AD1D
+P 5150 4200
+AR Path="/6072AD1D" Ref="R?"  Part="1" 
+AR Path="/5F9E7705/6072AD1D" Ref="R?"  Part="1" 
+AR Path="/5F9E7705/606D9B1D/6072AD1D" Ref="R28"  Part="1" 
+F 0 "R28" H 5250 4200 50  0000 C CNN
+F 1 "10k" H 5250 4300 50  0000 C CNN
+F 2 "" H 5150 4200 50  0001 C CNN
+F 3 "~" H 5150 4200 50  0001 C CNN
+	1    5150 4200
+	-1   0    0    1   
+$EndComp
+Wire Wire Line
+	7650 4300 7250 4300
+Text Notes 7000 4900 0    39   Italic 0
+Screw terminal
+$Comp
+L Device:Ferrite_Bead_Small FB?
+U 1 1 6072AD26
+P 6650 1650
+AR Path="/6072AD26" Ref="FB?"  Part="1" 
+AR Path="/5F9D7A3C/6072AD26" Ref="FB?"  Part="1" 
+AR Path="/5F9E7705/6072AD26" Ref="FB?"  Part="1" 
+AR Path="/5F9E7705/606D9B1D/6072AD26" Ref="FB6"  Part="1" 
+F 0 "FB6" V 6700 1750 50  0000 C CNN
+F 1 "Fe" V 6550 1600 50  0000 C CNN
+F 2 "" V 6580 1650 50  0001 C CNN
+F 3 "~" H 6650 1650 50  0001 C CNN
+	1    6650 1650
+	0    -1   -1   0   
+$EndComp
+Wire Wire Line
+	6750 1650 6850 1650
+$Comp
+L Device:D_Schottky_Small D?
+U 1 1 6072AD2D
+P 8000 3850
+AR Path="/5F9E7705/6072AD2D" Ref="D?"  Part="1" 
+AR Path="/5F9E7705/606D9B1D/6072AD2D" Ref="D7"  Part="1" 
+F 0 "D7" V 8000 3700 50  0000 C CNN
+F 1 "TBD" V 8000 4000 50  0000 C CNN
+F 2 "" V 8000 3850 50  0001 C CNN
+F 3 "~" V 8000 3850 50  0001 C CNN
+	1    8000 3850
+	0    1    1    0   
+$EndComp
+Connection ~ 7650 4300
+Wire Wire Line
+	7250 4100 6800 4100
+Wire Wire Line
+	6800 4200 7250 4200
+Wire Wire Line
+	6800 4400 7250 4400
+Wire Wire Line
+	6800 4500 7250 4500
+Wire Wire Line
+	6800 4600 7250 4600
+Wire Wire Line
+	6800 4700 7250 4700
+Wire Wire Line
+	7650 4000 8000 4000
+Wire Wire Line
+	8000 4000 8000 3950
+Wire Wire Line
+	8000 3750 8000 3700
+$Comp
+L Device:R_Small R?
+U 1 1 6072AD3E
+P 8000 4150
+AR Path="/6072AD3E" Ref="R?"  Part="1" 
+AR Path="/5F9D7A3C/6072AD3E" Ref="R?"  Part="1" 
+AR Path="/5F9E7705/6072AD3E" Ref="R?"  Part="1" 
+AR Path="/5F9E7705/606D9B1D/6072AD3E" Ref="R29"  Part="1" 
+F 0 "R29" H 8100 4200 50  0000 C CNN
+F 1 "2.2k" H 8150 4100 50  0000 C CNN
+F 2 "" H 8000 4150 50  0001 C CNN
+F 3 "~" H 8000 4150 50  0001 C CNN
+	1    8000 4150
+	1    0    0    -1  
+$EndComp
+$Comp
+L Device:LED D?
+U 1 1 6072AD44
+P 8000 4450
+AR Path="/6072AD44" Ref="D?"  Part="1" 
+AR Path="/5F9D7A3C/6072AD44" Ref="D?"  Part="1" 
+AR Path="/5F9E7705/6072AD44" Ref="D?"  Part="1" 
+AR Path="/5F9E7705/606D9B1D/6072AD44" Ref="D8"  Part="1" 
+F 0 "D8" V 8000 4550 50  0000 C CNN
+F 1 "BG1102W-TR" H 7900 4300 50  0000 C CNN
+F 2 "" H 8000 4450 50  0001 C CNN
+F 3 "~" H 8000 4450 50  0001 C CNN
+	1    8000 4450
+	0    -1   -1   0   
+$EndComp
+Wire Wire Line
+	8000 4050 8000 4000
+Connection ~ 8000 4000
+Wire Wire Line
+	8000 4300 8000 4250
+Wire Wire Line
+	7650 4650 8000 4650
+Wire Wire Line
+	8000 4650 8000 4600
+Wire Wire Line
+	7650 4300 7650 4650
+Wire Wire Line
+	8000 4800 8000 4650
+Connection ~ 8000 4650
+Text GLabel 2900 3900 0    50   Input ~ 0
+XCVR_UART_TX_DRV
+Wire Bus Line
+	2900 3900 3000 3900
+Entry Wire Line
+	3000 3400 3100 3300
+Entry Wire Line
+	3000 3500 3100 3400
+Entry Wire Line
+	3000 3600 3100 3500
+Text Label 4100 3300 0    50   ~ 0
+XCVR_TXD
+Text Label 4100 3400 0    50   ~ 0
+XCVR_RTS
+Text Label 4100 3500 0    50   ~ 0
+XCVR_DTR
+Connection ~ 7650 4000
+$Comp
+L Device:R_Small R25
+U 1 1 6078CA95
+P 3400 3700
+F 0 "R25" H 3200 3750 50  0000 L CNN
+F 1 "10M" H 3200 3650 50  0000 L CNN
+F 2 "" H 3400 3700 50  0001 C CNN
+F 3 "~" H 3400 3700 50  0001 C CNN
+	1    3400 3700
+	1    0    0    -1  
+$EndComp
+$Comp
+L Device:R_Small R26
+U 1 1 607905A0
+P 3650 3950
+F 0 "R26" H 3450 4000 50  0000 L CNN
+F 1 "10M" H 3450 3900 50  0000 L CNN
+F 2 "" H 3650 3950 50  0001 C CNN
+F 3 "~" H 3650 3950 50  0001 C CNN
+	1    3650 3950
+	1    0    0    -1  
+$EndComp
+$Comp
+L Device:R_Small R27
+U 1 1 6079137B
+P 3900 4200
+F 0 "R27" H 3700 4250 50  0000 L CNN
+F 1 "10M" H 3700 4150 50  0000 L CNN
+F 2 "" H 3900 4200 50  0001 C CNN
+F 3 "~" H 3900 4200 50  0001 C CNN
+	1    3900 4200
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	3100 3300 3400 3300
+Wire Wire Line
+	3100 3400 3650 3400
+Wire Wire Line
+	3100 3500 3900 3500
+Wire Wire Line
+	5150 4400 3900 4400
+Connection ~ 5150 4400
+Wire Wire Line
+	3400 3600 3400 3300
+Connection ~ 3400 3300
+Wire Wire Line
+	3400 3300 4500 3300
+Wire Wire Line
+	3650 3850 3650 3400
+Connection ~ 3650 3400
+Wire Wire Line
+	3650 3400 4500 3400
+Wire Wire Line
+	3900 4100 3900 3500
+Connection ~ 3900 3500
+Wire Wire Line
+	3900 3500 4500 3500
+Wire Wire Line
+	3900 4300 3900 4400
+Connection ~ 3900 4400
+Wire Wire Line
+	3900 4400 3650 4400
+Wire Wire Line
+	3650 4050 3650 4400
+Connection ~ 3650 4400
+Wire Wire Line
+	3650 4400 3400 4400
+Wire Wire Line
+	3400 3800 3400 4400
+Wire Wire Line
+	5350 4400 5600 4400
+Connection ~ 5350 4400
+Wire Bus Line
+	4000 2700 4000 3150
+Wire Bus Line
+	3000 3400 3000 3900
+Wire Bus Line
+	6700 2950 6700 4600
+$EndSCHEMATC