reflow-oven-control-pcb/frontend.sch

EESchema Schematic File Version 4
EELAYER 30 0
EELAYER END
$Descr A4 11693 8268
encoding utf-8
Sheet 2 3
Title "Reflow Oven Controller"
Date "2019-09-02"
Rev "v1.0"
Comp "Shimatta"
Comment1 ""
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
$Comp
L Amplifier_Operational:MCP6401UT-xOT U304
U 1 1 5D8C684C
P 3450 1400
F 0 "U304" H 3350 1400 50  0000 L CNN
F 1 "MCP6V31U" H 3450 1200 50  0000 L CNN
F 2 "Package_TO_SOT_SMD:SOT-23-5_HandSoldering" H 3450 1400 50  0001 L CNN
F 3 "http://ww1.microchip.com/downloads/en/devicedoc/22229d.pdf" H 3450 1400 50  0001 C CNN
	1    3450 1400
	1    0    0    -1  
$EndComp
Text HLabel 10000 1300 2    50   Output ~ 0
FORCE+
Text HLabel 10000 1600 2    50   Output ~ 0
FORCE-
Text HLabel 10000 1400 2    50   Input ~ 0
SENS+
Text HLabel 10000 1500 2    50   Output ~ 0
SENS-
Wire Wire Line
	10000 1500 9550 1500
Wire Wire Line
	10000 1400 9050 1400
Wire Wire Line
	9050 1400 9050 1800
Connection ~ 9050 1400
Wire Wire Line
	9550 1500 9550 1800
Connection ~ 9550 1500
$Comp
L Device:C C311
U 1 1 5D8EB53F
P 9050 1950
F 0 "C311" H 9165 1996 50  0000 L CNN
F 1 "100n" H 9165 1905 50  0000 L CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 9088 1800 50  0001 C CNN
F 3 "~" H 9050 1950 50  0001 C CNN
	1    9050 1950
	1    0    0    -1  
$EndComp
$Comp
L Device:C C312
U 1 1 5D8ECC3D
P 9550 1950
F 0 "C312" H 9665 1996 50  0000 L CNN
F 1 "100n" H 9665 1905 50  0000 L CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 9588 1800 50  0001 C CNN
F 3 "~" H 9550 1950 50  0001 C CNN
	1    9550 1950
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0322
U 1 1 5D8EE226
P 9050 2350
F 0 "#PWR0322" H 9050 2100 50  0001 C CNN
F 1 "GND" H 9055 2177 50  0000 C CNN
F 2 "" H 9050 2350 50  0001 C CNN
F 3 "" H 9050 2350 50  0001 C CNN
	1    9050 2350
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0323
U 1 1 5D8EE831
P 9550 2350
F 0 "#PWR0323" H 9550 2100 50  0001 C CNN
F 1 "GND" H 9555 2177 50  0000 C CNN
F 2 "" H 9550 2350 50  0001 C CNN
F 3 "" H 9550 2350 50  0001 C CNN
	1    9550 2350
	1    0    0    -1  
$EndComp
Wire Wire Line
	9550 2350 9550 2100
Wire Wire Line
	9050 2350 9050 2100
Text Label 7150 1300 0    50   ~ 0
F+
Text Label 7150 1400 0    50   ~ 0
S+
Text Label 7150 1500 0    50   ~ 0
S-
Text Label 7150 1600 0    50   ~ 0
F-
Wire Wire Line
	3150 1500 3100 1500
Wire Wire Line
	3100 1500 3100 1800
Wire Wire Line
	3100 1800 4100 1800
Text Label 4950 1800 2    50   ~ 0
F-
Wire Wire Line
	4650 1800 4650 1850
Connection ~ 4650 1800
Wire Wire Line
	4650 1800 4950 1800
$Comp
L Device:R R311
U 1 1 5D90BA7B
P 4650 2000
F 0 "R311" H 4720 2046 50  0000 L CNN
F 1 "1k 0.1%" H 4720 1955 50  0000 L CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 4580 2000 50  0001 C CNN
F 3 "~" H 4650 2000 50  0001 C CNN
	1    4650 2000
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0315
U 1 1 5D90C0A7
P 4650 2200
F 0 "#PWR0315" H 4650 1950 50  0001 C CNN
F 1 "GND" H 4655 2027 50  0000 C CNN
F 2 "" H 4650 2200 50  0001 C CNN
F 3 "" H 4650 2200 50  0001 C CNN
	1    4650 2200
	1    0    0    -1  
$EndComp
Wire Wire Line
	4650 2200 4650 2150
Wire Wire Line
	3350 1700 3350 2200
$Comp
L power:GND #PWR0313
U 1 1 5D90E0AF
P 3350 2200
F 0 "#PWR0313" H 3350 1950 50  0001 C CNN
F 1 "GND" H 3355 2027 50  0000 C CNN
F 2 "" H 3350 2200 50  0001 C CNN
F 3 "" H 3350 2200 50  0001 C CNN
	1    3350 2200
	1    0    0    -1  
$EndComp
Wire Wire Line
	3350 1100 3350 950 
Wire Wire Line
	3350 950  3550 950 
Connection ~ 3350 950 
Wire Wire Line
	3350 950  3350 850 
$Comp
L Device:C C306
U 1 1 5D910C4E
P 3700 950
F 0 "C306" V 3448 950 50  0000 C CNN
F 1 "100n" V 3539 950 50  0000 C CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 3738 800 50  0001 C CNN
F 3 "~" H 3700 950 50  0001 C CNN
	1    3700 950 
	0    1    1    0   
$EndComp
Wire Wire Line
	3850 950  4000 950 
Wire Wire Line
	4000 950  4000 1000
$Comp
L power:GND #PWR0314
U 1 1 5D912645
P 4000 1000
F 0 "#PWR0314" H 4000 750 50  0001 C CNN
F 1 "GND" H 4005 827 50  0000 C CNN
F 2 "" H 4000 1000 50  0001 C CNN
F 3 "" H 4000 1000 50  0001 C CNN
	1    4000 1000
	1    0    0    -1  
$EndComp
Wire Wire Line
	3750 1400 4100 1400
Text Label 4950 1400 2    50   ~ 0
F+
$Comp
L Device:C C309
U 1 1 5D918057
P 4100 1600
F 0 "C309" H 4215 1646 50  0000 L CNN
F 1 "1n" H 4215 1555 50  0000 L CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 4138 1450 50  0001 C CNN
F 3 "~" H 4100 1600 50  0001 C CNN
	1    4100 1600
	1    0    0    -1  
$EndComp
Wire Wire Line
	4100 1750 4100 1800
Connection ~ 4100 1800
Wire Wire Line
	4100 1800 4650 1800
Wire Wire Line
	4100 1450 4100 1400
Connection ~ 4100 1400
Wire Wire Line
	4100 1400 4950 1400
$Comp
L Reference_Voltage:TL431PK U301
U 1 1 5D927A1A
P 1900 1650
F 0 "U301" V 1946 1580 50  0000 R CNN
F 1 "TL431PK" V 1855 1580 50  0000 R CNN
F 2 "Package_TO_SOT_SMD:SOT-89-3" H 1900 1500 50  0001 C CIN
F 3 "http://www.ti.com/lit/ds/symlink/tl431.pdf" H 1900 1650 50  0001 C CIN
	1    1900 1650
	0    -1   -1   0   
$EndComp
$Comp
L Device:R R301
U 1 1 5D929598
P 1900 1000
F 0 "R301" H 1970 1046 50  0000 L CNN
F 1 "680" H 1970 955 50  0000 L CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 1830 1000 50  0001 C CNN
F 3 "~" H 1900 1000 50  0001 C CNN
	1    1900 1000
	1    0    0    -1  
$EndComp
Wire Wire Line
	1800 1650 1750 1650
Wire Wire Line
	1700 1650 1700 1400
Wire Wire Line
	1700 1400 1900 1400
Connection ~ 1900 1400
Wire Wire Line
	1900 1400 1900 1550
Wire Wire Line
	1900 1750 1900 1900
$Comp
L power:GND #PWR0302
U 1 1 5D92E1A1
P 1900 2200
F 0 "#PWR0302" H 1900 1950 50  0001 C CNN
F 1 "GND" H 1905 2027 50  0000 C CNN
F 2 "" H 1900 2200 50  0001 C CNN
F 3 "" H 1900 2200 50  0001 C CNN
	1    1900 2200
	1    0    0    -1  
$EndComp
Wire Wire Line
	1900 1900 2450 1900
Wire Wire Line
	2450 1900 2450 1750
Connection ~ 1900 1900
Wire Wire Line
	1900 1900 1900 2200
$Comp
L Device:C C301
U 1 1 5D932D1C
P 2450 1600
F 0 "C301" H 2565 1646 50  0000 L CNN
F 1 "1u" H 2565 1555 50  0000 L CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 2488 1450 50  0001 C CNN
F 3 "~" H 2450 1600 50  0001 C CNN
	1    2450 1600
	1    0    0    -1  
$EndComp
Wire Wire Line
	2450 1450 2450 1300
Wire Wire Line
	2450 1300 2750 1300
Wire Wire Line
	1900 1150 1900 1300
Wire Wire Line
	1900 1300 2000 1300
Connection ~ 1900 1300
Wire Wire Line
	1900 1300 1900 1400
$Comp
L Device:R R303
U 1 1 5D9371CC
P 2200 1300
F 0 "R303" V 1993 1300 50  0000 C CNN
F 1 "24k 0.1%" V 2084 1300 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 2130 1300 50  0001 C CNN
F 3 "~" H 2200 1300 50  0001 C CNN
	1    2200 1300
	0    1    1    0   
$EndComp
Wire Wire Line
	2350 1300 2450 1300
Connection ~ 2450 1300
Wire Wire Line
	1900 800  1900 850 
Wire Wire Line
	2750 1300 2750 1450
Connection ~ 2750 1300
Wire Wire Line
	2750 1300 3150 1300
$Comp
L Device:R R306
U 1 1 5D947159
P 2750 1600
F 0 "R306" H 2820 1646 50  0000 L CNN
F 1 "1k 0.1%" H 2820 1555 50  0000 L CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 2680 1600 50  0001 C CNN
F 3 "~" H 2750 1600 50  0001 C CNN
	1    2750 1600
	1    0    0    -1  
$EndComp
Wire Wire Line
	2750 1750 2750 1900
Wire Wire Line
	2750 1900 2450 1900
Connection ~ 2450 1900
Wire Wire Line
	7150 1600 10000 1600
Wire Wire Line
	7150 1500 9550 1500
Wire Wire Line
	7150 1400 9050 1400
Wire Wire Line
	7150 1300 10000 1300
Wire Wire Line
	2000 1300 2000 900 
Wire Wire Line
	2000 900  2150 900 
Connection ~ 2000 1300
Wire Wire Line
	2000 1300 2050 1300
$Comp
L Device:R R305
U 1 1 5D9B187D
P 2300 900
F 0 "R305" V 2093 900 50  0000 C CNN
F 1 "1" V 2184 900 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 2230 900 50  0001 C CNN
F 3 "~" H 2300 900 50  0001 C CNN
	1    2300 900 
	0    1    1    0   
$EndComp
Text Label 2700 900  2    50   ~ 0
VREF
$Comp
L Device:C C304
U 1 1 5D9BF43F
P 2850 900
F 0 "C304" V 2598 900 50  0000 C CNN
F 1 "1u" V 2689 900 50  0000 C CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 2888 750 50  0001 C CNN
F 3 "~" H 2850 900 50  0001 C CNN
	1    2850 900 
	0    1    1    0   
$EndComp
Wire Wire Line
	2450 900  2700 900 
$Comp
L power:GND #PWR0310
U 1 1 5D9BFEE1
P 3100 950
F 0 "#PWR0310" H 3100 700 50  0001 C CNN
F 1 "GND" H 3105 777 50  0000 C CNN
F 2 "" H 3100 950 50  0001 C CNN
F 3 "" H 3100 950 50  0001 C CNN
	1    3100 950 
	1    0    0    -1  
$EndComp
Wire Wire Line
	3100 950  3100 900 
Wire Wire Line
	3100 900  3000 900 
Wire Wire Line
	9150 1050 10000 1050
Text HLabel 10000 1050 2    50   Output ~ 0
VREF
Text Label 9150 1050 0    50   ~ 0
VREF
Wire Wire Line
	2650 3500 2650 3550
Wire Wire Line
	2650 3550 2800 3550
Connection ~ 2650 3550
Wire Wire Line
	2650 3550 2650 3600
$Comp
L Device:C C303
U 1 1 5DA18039
P 2950 3550
F 0 "C303" V 2698 3550 50  0000 C CNN
F 1 "100n" V 2789 3550 50  0000 C CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 2988 3400 50  0001 C CNN
F 3 "~" H 2950 3550 50  0001 C CNN
	1    2950 3550
	0    1    1    0   
$EndComp
Wire Wire Line
	3100 3550 3250 3550
Wire Wire Line
	3250 3550 3250 3600
Text Label 1600 3700 0    50   ~ 0
S+
Text Label 1600 4100 0    50   ~ 0
S-
Wire Wire Line
	4250 3900 4250 3650
$Comp
L power:+3V3 #PWR0320
U 1 1 5DB05D58
P 4250 3300
F 0 "#PWR0320" H 4250 3150 50  0001 C CNN
F 1 "+3V3" H 4265 3473 50  0000 C CNN
F 2 "" H 4250 3300 50  0001 C CNN
F 3 "" H 4250 3300 50  0001 C CNN
	1    4250 3300
	1    0    0    -1  
$EndComp
$Comp
L Diode:1N4448W D301
U 1 1 5DB075CB
P 4250 3500
F 0 "D301" V 4204 3580 50  0000 L CNN
F 1 "1N4448W" V 4295 3580 50  0000 L CNN
F 2 "Diode_SMD:D_SOD-123" H 4250 3325 50  0001 C CNN
F 3 "https://www.vishay.com/docs/85722/1n4448w.pdf" H 4250 3500 50  0001 C CNN
	1    4250 3500
	0    1    1    0   
$EndComp
Wire Wire Line
	4250 3350 4250 3300
$Comp
L Device:R R314
U 1 1 5DB0C2DA
P 4050 3900
F 0 "R314" V 3843 3900 50  0000 C CNN
F 1 "10" V 3934 3900 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 3980 3900 50  0001 C CNN
F 3 "~" H 4050 3900 50  0001 C CNN
	1    4050 3900
	0    1    1    0   
$EndComp
Text HLabel 4900 3900 2    50   Output ~ 0
TEMP_OUT
Wire Wire Line
	4200 3900 4250 3900
Connection ~ 4250 3900
Wire Wire Line
	4250 3900 4900 3900
$Comp
L power:+5VA #PWR0301
U 1 1 5D89CDE5
P 1900 800
F 0 "#PWR0301" H 1900 650 50  0001 C CNN
F 1 "+5VA" H 1915 973 50  0000 C CNN
F 2 "" H 1900 800 50  0001 C CNN
F 3 "" H 1900 800 50  0001 C CNN
	1    1900 800 
	1    0    0    -1  
$EndComp
$Comp
L power:+5VA #PWR0312
U 1 1 5D89F047
P 3350 850
F 0 "#PWR0312" H 3350 700 50  0001 C CNN
F 1 "+5VA" H 3365 1023 50  0000 C CNN
F 2 "" H 3350 850 50  0001 C CNN
F 3 "" H 3350 850 50  0001 C CNN
	1    3350 850 
	1    0    0    -1  
$EndComp
$Comp
L power:+5VA #PWR0305
U 1 1 5D8A308A
P 2650 3500
F 0 "#PWR0305" H 2650 3350 50  0001 C CNN
F 1 "+5VA" H 2665 3673 50  0000 C CNN
F 2 "" H 2650 3500 50  0001 C CNN
F 3 "" H 2650 3500 50  0001 C CNN
	1    2650 3500
	1    0    0    -1  
$EndComp
$Comp
L power:+5VA #PWR0325
U 1 1 5D8B0C95
P 10150 3650
F 0 "#PWR0325" H 10150 3500 50  0001 C CNN
F 1 "+5VA" H 10165 3823 50  0000 C CNN
F 2 "" H 10150 3650 50  0001 C CNN
F 3 "" H 10150 3650 50  0001 C CNN
	1    10150 3650
	1    0    0    -1  
$EndComp
$Comp
L power:+5V #PWR0321
U 1 1 5D8B40C4
P 8900 3650
F 0 "#PWR0321" H 8900 3500 50  0001 C CNN
F 1 "+5V" H 8915 3823 50  0000 C CNN
F 2 "" H 8900 3650 50  0001 C CNN
F 3 "" H 8900 3650 50  0001 C CNN
	1    8900 3650
	1    0    0    -1  
$EndComp
$Comp
L Device:L_Small L301
U 1 1 5D8B5422
P 9400 3700
F 0 "L301" V 9585 3700 50  0000 C CNN
F 1 "1u" V 9494 3700 50  0000 C CNN
F 2 "Inductor_SMD:L_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 9400 3700 50  0001 C CNN
F 3 "~" H 9400 3700 50  0001 C CNN
	1    9400 3700
	0    -1   -1   0   
$EndComp
$Comp
L Device:R R315
U 1 1 5D8D4A65
P 9800 3700
F 0 "R315" V 9593 3700 50  0000 C CNN
F 1 "10" V 9684 3700 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 9730 3700 50  0001 C CNN
F 3 "~" H 9800 3700 50  0001 C CNN
	1    9800 3700
	0    1    1    0   
$EndComp
Wire Wire Line
	8900 3650 8900 3700
Wire Wire Line
	8900 3700 9300 3700
Wire Wire Line
	9500 3700 9650 3700
Wire Wire Line
	10150 3700 10150 3650
Wire Wire Line
	9950 3700 10000 3700
$Comp
L Device:C C313
U 1 1 5D8F201B
P 10000 3950
F 0 "C313" H 10115 3996 50  0000 L CNN
F 1 "10u" H 10115 3905 50  0000 L CNN
F 2 "Capacitor_SMD:C_1210_3225Metric" H 10038 3800 50  0001 C CNN
F 3 "~" H 10000 3950 50  0001 C CNN
	1    10000 3950
	1    0    0    -1  
$EndComp
Wire Wire Line
	10000 3800 10000 3700
Connection ~ 10000 3700
Wire Wire Line
	10000 3700 10150 3700
Wire Wire Line
	10000 4100 10000 4200
$Comp
L power:GND #PWR0324
U 1 1 5D903DD6
P 10000 4200
F 0 "#PWR0324" H 10000 3950 50  0001 C CNN
F 1 "GND" H 10005 4027 50  0000 C CNN
F 2 "" H 10000 4200 50  0001 C CNN
F 3 "" H 10000 4200 50  0001 C CNN
	1    10000 4200
	1    0    0    -1  
$EndComp
$Comp
L Device:C C307
U 1 1 5E051281
P 1750 2050
F 0 "C307" H 1865 2096 50  0000 L CNN
F 1 "10u" H 1865 2005 50  0000 L CNN
F 2 "Capacitor_SMD:C_0805_2012Metric" H 1788 1900 50  0001 C CNN
F 3 "~" H 1750 2050 50  0001 C CNN
	1    1750 2050
	1    0    0    -1  
$EndComp
Wire Wire Line
	1750 2200 1900 2200
Connection ~ 1900 2200
Wire Wire Line
	1750 1900 1750 1650
Connection ~ 1750 1650
Wire Wire Line
	1750 1650 1700 1650
$Comp
L Sensor_Temperature:DS18B20 U306
U 1 1 5E08DC55
P 5350 6850
F 0 "U306" H 5120 6896 50  0000 R CNN
F 1 "DS18B20" H 5120 6805 50  0000 R CNN
F 2 "Package_TO_SOT_THT:TO-92_Inline" H 4350 6600 50  0001 C CNN
F 3 "http://datasheets.maximintegrated.com/en/ds/DS18B20.pdf" H 5200 7100 50  0001 C CNN
	1    5350 6850
	-1   0    0    -1  
$EndComp
$Comp
L Device:C C314
U 1 1 5E096137
P 6050 6850
F 0 "C314" V 5798 6850 50  0000 C CNN
F 1 "100n" V 5889 6850 50  0000 C CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 6088 6700 50  0001 C CNN
F 3 "~" H 6050 6850 50  0001 C CNN
	1    6050 6850
	-1   0    0    1   
$EndComp
Wire Wire Line
	6050 7000 6050 7250
Wire Wire Line
	6050 7250 5350 7250
Wire Wire Line
	5350 7250 5350 7150
Wire Wire Line
	5350 7250 5350 7350
Connection ~ 5350 7250
Wire Wire Line
	6050 6700 6050 6400
Wire Wire Line
	6050 6400 5350 6400
Wire Wire Line
	5350 6400 5350 6550
Wire Wire Line
	5350 6400 5350 6300
Connection ~ 5350 6400
$Comp
L power:+3V3 #PWR0130
U 1 1 5E0AC49E
P 5350 6200
F 0 "#PWR0130" H 5350 6050 50  0001 C CNN
F 1 "+3V3" H 5365 6373 50  0000 C CNN
F 2 "" H 5350 6200 50  0001 C CNN
F 3 "" H 5350 6200 50  0001 C CNN
	1    5350 6200
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0131
U 1 1 5E0AE6F5
P 5350 7350
F 0 "#PWR0131" H 5350 7100 50  0001 C CNN
F 1 "GND" H 5355 7177 50  0000 C CNN
F 2 "" H 5350 7350 50  0001 C CNN
F 3 "" H 5350 7350 50  0001 C CNN
	1    5350 7350
	1    0    0    -1  
$EndComp
Wire Wire Line
	5050 6850 4700 6850
$Comp
L Device:R R316
U 1 1 5E0B45CD
P 4700 6600
F 0 "R316" H 4770 6646 50  0000 L CNN
F 1 "4k7" H 4770 6555 50  0000 L CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 4630 6600 50  0001 C CNN
F 3 "~" H 4700 6600 50  0001 C CNN
	1    4700 6600
	1    0    0    -1  
$EndComp
Wire Wire Line
	4700 6750 4700 6850
Connection ~ 4700 6850
Wire Wire Line
	4700 6850 4600 6850
Wire Wire Line
	4700 6450 4700 6300
Wire Wire Line
	4700 6300 5350 6300
Connection ~ 5350 6300
Wire Wire Line
	5350 6300 5350 6200
Text HLabel 4600 6850 0    50   BiDi ~ 0
FRONTEND_TEMP
Wire Notes Line
	6500 5750 6500 7700
Wire Notes Line
	6500 7700 3800 7700
Wire Notes Line
	3800 7700 3800 5750
Wire Notes Line
	3800 5750 6500 5750
Text Notes 3850 6000 0    50   ~ 0
Optional. Presence is detected in SW\nPopulate this circuitry, if a temperature compensation\nof the frontend is wanted
Text Notes 5450 750  0    100  ~ 20
Use low drift types for the marked resistors
Wire Notes Line
	4500 1750 4500 2200
Wire Notes Line
	4500 2200 5150 2200
Wire Notes Line
	5150 2200 5150 1750
Wire Notes Line
	5150 1750 4500 1750
Wire Notes Line
	2600 1450 3150 1450
Wire Notes Line
	3150 1450 3150 1800
Wire Notes Line
	3150 1800 2600 1800
Wire Notes Line
	2600 1800 2600 1450
Wire Notes Line
	2000 1000 2000 1400
Wire Notes Line
	2000 1400 2350 1400
Wire Notes Line
	2350 1400 2350 1050
Wire Notes Line
	2350 1050 2000 1050
Text Notes 6950 4400 0    50   ~ 0
High performance ADC (optional)
Wire Wire Line
	9700 5150 9700 5250
$Comp
L Device:C C211
U 1 1 5E0AB55E
P 9700 5400
F 0 "C211" H 9815 5446 50  0000 L CNN
F 1 "1u" H 9815 5355 50  0000 L CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 9738 5250 50  0001 C CNN
F 3 "~" H 9700 5400 50  0001 C CNN
	1    9700 5400
	1    0    0    -1  
$EndComp
$Comp
L Device:C C212
U 1 1 5E0AC008
P 10050 5400
F 0 "C212" H 10165 5446 50  0000 L CNN
F 1 "100n" H 10165 5355 50  0000 L CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 10088 5250 50  0001 C CNN
F 3 "~" H 10050 5400 50  0001 C CNN
	1    10050 5400
	1    0    0    -1  
$EndComp
Wire Wire Line
	9700 5150 10050 5150
Wire Wire Line
	10050 5150 10050 5250
Connection ~ 9700 5150
Wire Wire Line
	10050 5550 10050 5600
Wire Wire Line
	9700 5600 9700 5550
Wire Wire Line
	9700 5600 9700 5650
Connection ~ 9700 5600
$Comp
L power:GND #PWR0134
U 1 1 5E0BF770
P 9700 5650
F 0 "#PWR0134" H 9700 5400 50  0001 C CNN
F 1 "GND" H 9705 5477 50  0000 C CNN
F 2 "" H 9700 5650 50  0001 C CNN
F 3 "" H 9700 5650 50  0001 C CNN
	1    9700 5650
	1    0    0    -1  
$EndComp
$Comp
L Analog_ADC:MCP3551-EMS U201
U 1 1 5E0C26AA
P 8600 5650
F 0 "U201" H 8600 6139 50  0000 C CNN
F 1 "MCP3551-EMS" H 8600 6230 50  0000 C CNN
F 2 "Package_SO:SO-8_3.9x4.9mm_P1.27mm" H 8600 5650 50  0001 C CIN
F 3 "http://ww1.microchip.com/downloads/en/devicedoc/21950c.pdf" H 8600 5650 50  0001 C CNN
	1    8600 5650
	-1   0    0    1   
$EndComp
Wire Wire Line
	9550 5750 9100 5750
Wire Wire Line
	9100 5550 9300 5550
Wire Wire Line
	9500 5550 9500 5600
Wire Wire Line
	9500 5600 9700 5600
Wire Wire Line
	8500 6050 10100 6050
Wire Wire Line
	10600 6050 10600 5150
Wire Wire Line
	10600 5150 10050 5150
Connection ~ 10050 5150
Text Label 8700 5000 0    50   ~ 0
VREF
Wire Wire Line
	8500 5250 8500 5100
Wire Wire Line
	8500 5100 8350 5100
Wire Wire Line
	8350 5100 8350 5200
$Comp
L power:GND #PWR0135
U 1 1 5E110225
P 8350 5200
F 0 "#PWR0135" H 8350 4950 50  0001 C CNN
F 1 "GND" H 8355 5027 50  0000 C CNN
F 2 "" H 8350 5200 50  0001 C CNN
F 3 "" H 8350 5200 50  0001 C CNN
	1    8350 5200
	1    0    0    -1  
$EndComp
Wire Wire Line
	8100 5550 7900 5550
Text HLabel 7750 5550 0    50   Input ~ 0
ADC_CS
Text HLabel 7800 5650 0    50   Input ~ 0
ADC_SDO
Text HLabel 7800 5750 0    50   Input ~ 0
ADC_SCK
Wire Wire Line
	7800 5750 8100 5750
Wire Wire Line
	8100 5650 7800 5650
Wire Wire Line
	7900 5550 7900 5450
Connection ~ 7900 5550
Wire Wire Line
	7900 5550 7750 5550
$Comp
L Device:R R201
U 1 1 5E14363F
P 7900 5300
F 0 "R201" H 7970 5346 50  0000 L CNN
F 1 "10k" H 7970 5255 50  0000 L CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 7830 5300 50  0001 C CNN
F 3 "~" H 7900 5300 50  0001 C CNN
	1    7900 5300
	1    0    0    -1  
$EndComp
Text Label 10250 5150 0    50   ~ 0
ADC_VDD
Text Label 7500 5100 0    50   ~ 0
ADC_VDD
Wire Wire Line
	7500 5100 7900 5100
Wire Wire Line
	7900 5100 7900 5150
$Comp
L Regulator_Linear:AP1117-33 U204
U 1 1 5E20AB26
P 9300 5150
F 0 "U204" H 9300 5392 50  0000 C CNN
F 1 "AP1117-33" H 9300 5301 50  0000 C CNN
F 2 "Package_TO_SOT_SMD:SOT-223-3_TabPin2" H 9300 5350 50  0001 C CNN
F 3 "http://www.diodes.com/datasheets/AP1117.pdf" H 9400 4900 50  0001 C CNN
	1    9300 5150
	1    0    0    -1  
$EndComp
Wire Wire Line
	9600 5150 9700 5150
Wire Wire Line
	9300 5450 9300 5550
Connection ~ 9300 5550
Wire Wire Line
	9300 5550 9500 5550
Wire Wire Line
	9000 5150 8950 5150
Wire Wire Line
	8950 5150 8950 4750
$Comp
L power:+5VA #PWR0133
U 1 1 5E22FC84
P 8950 4750
F 0 "#PWR0133" H 8950 4600 50  0001 C CNN
F 1 "+5VA" H 8965 4923 50  0000 C CNN
F 2 "" H 8950 4750 50  0001 C CNN
F 3 "" H 8950 4750 50  0001 C CNN
	1    8950 4750
	1    0    0    -1  
$EndComp
Text Label 9550 5750 2    50   ~ 0
ADC_TEMP
$Comp
L Device:R R203
U 1 1 5E26BBD2
P 10100 5900
F 0 "R203" H 10170 5946 50  0000 L CNN
F 1 "R_LOAD" H 10170 5855 50  0000 L CNN
F 2 "Resistor_SMD:R_1206_3216Metric" V 10030 5900 50  0001 C CNN
F 3 "~" H 10100 5900 50  0001 C CNN
	1    10100 5900
	1    0    0    -1  
$EndComp
Connection ~ 10100 6050
Wire Wire Line
	10100 6050 10600 6050
Wire Wire Line
	10100 5750 10100 5600
Wire Wire Line
	9700 5600 10050 5600
Connection ~ 10050 5600
Wire Wire Line
	10050 5600 10100 5600
Wire Notes Line
	6950 4500 6950 6550
Wire Notes Line
	6950 4500 11200 4500
Wire Wire Line
	8700 4700 8400 4700
Wire Wire Line
	8700 4700 8700 5250
$Comp
L Device:C C221
U 1 1 5E36C216
P 8250 4700
F 0 "C221" V 8502 4700 50  0000 C CNN
F 1 "100n" V 8411 4700 50  0000 C CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 8288 4550 50  0001 C CNN
F 3 "~" H 8250 4700 50  0001 C CNN
	1    8250 4700
	0    -1   -1   0   
$EndComp
Wire Wire Line
	8100 4700 8000 4700
Wire Wire Line
	8000 4700 8000 5100
Wire Wire Line
	8000 5100 8350 5100
Connection ~ 8350 5100
$Comp
L Amplifier_Instrumentation:INA128 U205
U 1 1 5E153C60
P 2650 3900
F 0 "U205" H 3094 3946 50  0000 L CNN
F 1 "INA126" H 3094 3855 50  0000 L CNN
F 2 "Package_SO:SO-8_3.9x4.9mm_P1.27mm" H 2750 3900 50  0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/ina128.pdf" H 2750 3900 50  0001 C CNN
	1    2650 3900
	1    0    0    -1  
$EndComp
Text Label 3800 3900 2    50   ~ 0
ADC_TEMP
Wire Wire Line
	3050 3900 3900 3900
$Comp
L Device:R R213
U 1 1 5E17F6CD
P 2000 3900
F 0 "R213" H 2070 3946 50  0000 L CNN
F 1 "16k" H 2070 3855 50  0000 L CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 1930 3900 50  0001 C CNN
F 3 "~" H 2000 3900 50  0001 C CNN
	1    2000 3900
	1    0    0    -1  
$EndComp
Wire Wire Line
	1600 3700 2350 3700
Wire Wire Line
	2350 4100 1600 4100
Wire Wire Line
	2000 4050 2300 4050
Wire Wire Line
	2300 4050 2300 4000
Wire Wire Line
	2300 4000 2350 4000
Wire Wire Line
	2350 3800 2300 3800
Wire Wire Line
	2300 3800 2300 3750
Wire Wire Line
	2300 3750 2000 3750
Wire Wire Line
	2650 4200 2650 4250
Wire Wire Line
	2650 4250 2700 4250
Wire Wire Line
	2750 4250 2750 4200
Wire Wire Line
	2700 4250 2700 4350
Connection ~ 2700 4250
Wire Wire Line
	2700 4250 2750 4250
$Comp
L power:GND #PWR0141
U 1 1 5E1B0C0A
P 2700 4350
F 0 "#PWR0141" H 2700 4100 50  0001 C CNN
F 1 "GND" H 2705 4177 50  0000 C CNN
F 2 "" H 2700 4350 50  0001 C CNN
F 3 "" H 2700 4350 50  0001 C CNN
	1    2700 4350
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0142
U 1 1 5E1B21BD
P 3250 3600
F 0 "#PWR0142" H 3250 3350 50  0001 C CNN
F 1 "GND" H 3255 3427 50  0000 C CNN
F 2 "" H 3250 3600 50  0001 C CNN
F 3 "" H 3250 3600 50  0001 C CNN
	1    3250 3600
	1    0    0    -1  
$EndComp
$EndSCHEMATC