pcb/reflow-oven-control-pcb
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fa6782c21d
reflow-oven-control-pcb/frontend.sch
Mario Hüttel fa6782c21d Prepare for v1.2 
* Remove voltage buffer Opamp after TL431PK because it may oscillate
* Replace TL431PK with TL431LI. Stabilized by very large capacitance (> 10uF)
* Add panic passives to differential amplifier in order to avoid oscillaton. Values as they are now should work.
* Remove external ADC. Tests with version v1.1 show that the precision of the STM's ADC is sufficient, (once all oscillations are damped by modifying the circuit)
* Power whole OpAmp circuit with 3.3 volts in order to eliminate the need for the clamping diode at the ADC pin. This diode showed a high reverse current over temperature, which affected the measurement.
2020-02-05 18:30:34 +01:00

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EESchema Schematic File Version 4
EELAYER 30 0
EELAYER END
$Descr A4 11693 8268
encoding utf-8
Sheet 3 3
Title "Reflow Oven Controller"
Date "2019-09-02"
Rev "v1.0"
Comp "Shimatta"
Comment1 ""
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
$Comp
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Optional. Presence is detected in SW\nPopulate this circuitry, if a temperature compensation\nof the frontend is wanted
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Use low drift types for the marked resistors
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Wire Wire Line
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$Comp
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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F 0 "#PWR0141" H 5450 3350 50 0001 C CNN
F 1 "GND" H 5455 3427 50 0000 C CNN
F 2 "" H 5450 3600 50 0001 C CNN
F 3 "" H 5450 3600 50 0001 C CNN
1 5450 3600
1 0 0 -1
$EndComp
$Comp
L Amplifier_Operational:MCP6401UT-xOT U209
U 1 1 5E2E5D52
P 4950 3900
F 0 "U209" H 4850 3900 50 0000 L CNN
F 1 "MCP6V31U" H 4950 3700 50 0000 L CNN
F 2 "Package_TO_SOT_SMD:SOT-353_SC-70-5" H 4950 3900 50 0001 L CNN
F 3 "http://ww1.microchip.com/downloads/en/devicedoc/22229d.pdf" H 4950 3900 50 0001 C CNN
1 4950 3900
1 0 0 -1
$EndComp
Wire Wire Line
5250 3900 5600 3900
Wire Wire Line
4850 4200 4850 4550
$Comp
L power:GND #PWR0142
U 1 1 5E3229FE
P 4850 4550
F 0 "#PWR0142" H 4850 4300 50 0001 C CNN
F 1 "GND" H 4855 4377 50 0000 C CNN
F 2 "" H 4850 4550 50 0001 C CNN
F 3 "" H 4850 4550 50 0001 C CNN
1 4850 4550
1 0 0 -1
$EndComp
$Comp
L Device:R R215
U 1 1 5E333B2A
P 3600 3600
F 0 "R215" H 3670 3646 50 0000 L CNN
F 1 "1k 0.1%" H 3670 3555 50 0000 L CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 3530 3600 50 0001 C CNN
F 3 "~" H 3600 3600 50 0001 C CNN
1 3600 3600
0 1 1 0
$EndComp
Wire Wire Line
2950 3600 3450 3600
Wire Wire Line
3750 3600 4000 3600
Wire Wire Line
4000 3600 4000 3800
Wire Wire Line
4000 3800 4550 3800
Wire Wire Line
4000 3800 4000 4200
Connection ~ 4000 3800
$Comp
L Device:R R216
U 1 1 5E352DB6
P 4000 4350
F 0 "R216" H 4070 4396 50 0000 L CNN
F 1 "5k 0.1%" H 4070 4305 50 0000 L CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 3930 4350 50 0001 C CNN
F 3 "~" H 4000 4350 50 0001 C CNN
1 4000 4350
-1 0 0 1
$EndComp
Wire Wire Line
4000 4500 4000 4550
$Comp
L power:GND #PWR0143
U 1 1 5E35E6EA
P 4000 4550
F 0 "#PWR0143" H 4000 4300 50 0001 C CNN
F 1 "GND" H 4005 4377 50 0000 C CNN
F 2 "" H 4000 4550 50 0001 C CNN
F 3 "" H 4000 4550 50 0001 C CNN
1 4000 4550
1 0 0 -1
$EndComp
Wire Wire Line
4350 5550 4350 5400
Wire Wire Line
2900 5550 4350 5550
$Comp
L Device:R R217
U 1 1 5E381FD9
P 4350 5250
F 0 "R217" H 4200 5300 50 0000 L CNN
F 1 "1k 0.1%" H 4000 5200 50 0000 L CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 4280 5250 50 0001 C CNN
F 3 "~" H 4350 5250 50 0001 C CNN
1 4350 5250
-1 0 0 1
$EndComp
Wire Wire Line
4350 5100 4350 4350
Wire Wire Line
4350 4350 5600 4350
Wire Wire Line
5600 4350 5600 4250
Connection ~ 4350 4350
Wire Wire Line
4350 4350 4350 4000
$Comp
L Device:R R218
U 1 1 5E3A5DAA
P 5600 4100
F 0 "R218" H 5670 4146 50 0000 L CNN
F 1 "5k 0.1%" H 5670 4055 50 0000 L CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 5530 4100 50 0001 C CNN
F 3 "~" H 5600 4100 50 0001 C CNN
1 5600 4100
-1 0 0 1
$EndComp
Wire Wire Line
5600 3950 5600 3900
Connection ~ 5600 3900
Wire Notes Line
5250 3950 5700 3950
Wire Notes Line
5700 3950 5700 4300
Wire Notes Line
5700 4300 5250 4300
Wire Notes Line
5250 4300 5250 3950
Wire Notes Line
3550 4100 4100 4100
Wire Notes Line
4100 4100 4100 4500
Wire Notes Line
4100 4500 3550 4500
Wire Notes Line
3550 4500 3550 4100
Wire Notes Line
3800 4000 2850 4000
Wire Notes Line
2850 4000 2850 3400
Wire Notes Line
2850 3400 3800 3400
Wire Notes Line
3800 3400 3800 4000
Wire Notes Line
1050 6150 1050 6500
Wire Notes Line
1050 6500 1750 6500
Wire Notes Line
1750 6500 1750 6150
Wire Notes Line
1050 6150 1750 6150
Wire Notes Line
2750 5450 2750 6150
Wire Notes Line
2750 6150 3350 6150
Wire Notes Line
3350 6150 3350 5450
Wire Notes Line
3350 5450 2750 5450
Wire Notes Line
4200 5100 4200 5400
Wire Notes Line
4200 5400 4750 5400
Wire Notes Line
4750 5400 4750 5100
Wire Notes Line
4750 5100 4200 5100
$Comp
L power:+3.3VA #PWR0145
U 1 1 5E4EDCE6
P 10350 2500
F 0 "#PWR0145" H 10350 2350 50 0001 C CNN
F 1 "+3.3VA" H 10365 2673 50 0000 C CNN
F 2 "" H 10350 2500 50 0001 C CNN
F 3 "" H 10350 2500 50 0001 C CNN
1 10350 2500
1 0 0 -1
$EndComp
$Comp
L Reference_Voltage:TL431DBZ U201
U 1 1 5E5592F3
P 2700 1550
F 0 "U201" V 2746 1480 50 0000 R CNN
F 1 "TL431LI-DBZ" V 2655 1480 50 0000 R CNN
F 2 "Package_TO_SOT_SMD:SOT-23" H 2700 1400 50 0001 C CIN
F 3 "http://www.ti.com/lit/ds/symlink/tl431.pdf" H 2700 1550 50 0001 C CIN
1 2700 1550
0 -1 -1 0
$EndComp
$Comp
L Device:C C201
U 1 1 5E55CA76
P 2400 1900
F 0 "C201" H 2515 1946 50 0000 L CNN
F 1 "10u" H 2515 1855 50 0000 L CNN
F 2 "Capacitor_SMD:C_1210_3225Metric" H 2438 1750 50 0001 C CNN
F 3 "~" H 2400 1900 50 0001 C CNN
1 2400 1900
1 0 0 -1
$EndComp
Wire Wire Line
2700 1050 2700 1200
Wire Wire Line
2700 1200 3400 1200
Connection ~ 2700 1200
Wire Wire Line
2700 1200 2700 1300
Connection ~ 3400 1200
Wire Wire Line
3400 1200 3400 850
$Comp
L power:+3.3VA #PWR0146
U 1 1 5E58A8D7
P 2700 700
F 0 "#PWR0146" H 2700 550 50 0001 C CNN
F 1 "+3.3VA" H 2715 873 50 0000 C CNN
F 2 "" H 2700 700 50 0001 C CNN
F 3 "" H 2700 700 50 0001 C CNN
1 2700 700
1 0 0 -1
$EndComp
$Comp
L power:+3.3VA #PWR0147
U 1 1 5E58CB8A
P 4750 800
F 0 "#PWR0147" H 4750 650 50 0001 C CNN
F 1 "+3.3VA" H 4765 973 50 0000 C CNN
F 2 "" H 4750 800 50 0001 C CNN
F 3 "" H 4750 800 50 0001 C CNN
1 4750 800
1 0 0 -1
$EndComp
$Comp
L power:+3.3VA #PWR0148
U 1 1 5E593950
P 1700 3200
F 0 "#PWR0148" H 1700 3050 50 0001 C CNN
F 1 "+3.3VA" H 1715 3373 50 0000 C CNN
F 2 "" H 1700 3200 50 0001 C CNN
F 3 "" H 1700 3200 50 0001 C CNN
1 1700 3200
1 0 0 -1
$EndComp
$Comp
L power:+3.3VA #PWR0149
U 1 1 5E598A9D
P 1650 5150
F 0 "#PWR0149" H 1650 5000 50 0001 C CNN
F 1 "+3.3VA" H 1665 5323 50 0000 C CNN
F 2 "" H 1650 5150 50 0001 C CNN
F 3 "" H 1650 5150 50 0001 C CNN
1 1650 5150
1 0 0 -1
$EndComp
$Comp
L power:+3.3VA #PWR0150
U 1 1 5E59E961
P 4850 3500
F 0 "#PWR0150" H 4850 3350 50 0001 C CNN
F 1 "+3.3VA" H 4865 3673 50 0000 C CNN
F 2 "" H 4850 3500 50 0001 C CNN
F 3 "" H 4850 3500 50 0001 C CNN
1 4850 3500
1 0 0 -1
$EndComp
Wire Wire Line
7650 1400 7650 2000
Connection ~ 7650 1400
Wire Wire Line
7650 1400 9050 1400
Wire Wire Line
8050 1500 8050 2000
Connection ~ 8050 1500
Wire Wire Line
8050 1500 9550 1500
$Comp
L Device:R R209
U 1 1 5E5C0B2B
P 7850 2000
F 0 "R209" V 7643 2000 50 0000 C CNN
F 1 "2M" V 7734 2000 50 0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 7780 2000 50 0001 C CNN
F 3 "~" H 7850 2000 50 0001 C CNN
1 7850 2000
0 1 1 0
$EndComp
Wire Wire Line
7650 2000 7700 2000
Wire Wire Line
8000 2000 8050 2000
Wire Wire Line
9050 1400 9050 1850
Wire Wire Line
9550 1500 9550 1850
$Comp
L Device:C C202
U 1 1 5E656F7C
P 9300 1850
F 0 "C202" H 9415 1896 50 0000 L CNN
F 1 "22n" H 9415 1805 50 0000 L CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 9338 1700 50 0001 C CNN
F 3 "~" H 9300 1850 50 0001 C CNN
1 9300 1850
0 1 1 0
$EndComp
Wire Wire Line
9150 1850 9050 1850
Wire Wire Line
9450 1850 9550 1850
Wire Wire Line
6250 4500 6250 4350
$Comp
L Device:R R211
U 1 1 5E696A10
P 5950 3900
F 0 "R211" V 5743 3900 50 0000 C CNN
F 1 "0" V 5834 3900 50 0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 5880 3900 50 0001 C CNN
F 3 "~" H 5950 3900 50 0001 C CNN
1 5950 3900
0 -1 -1 0
$EndComp
Wire Wire Line
5600 3900 5800 3900
Wire Wire Line
4350 4000 4350 3350
Connection ~ 4350 4000
$Comp
L Device:R R210
U 1 1 5E6BEB7A
P 4350 3200
F 0 "R210" H 4420 3246 50 0000 L CNN
F 1 "DNP" H 4420 3155 50 0000 L CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 4280 3200 50 0001 C CNN
F 3 "~" H 4350 3200 50 0001 C CNN
1 4350 3200
-1 0 0 1
$EndComp
$Comp
L Device:C C210
U 1 1 5E6BF72D
P 4550 3200
F 0 "C210" V 4298 3200 50 0000 C CNN
F 1 "DNP" V 4389 3200 50 0000 C CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 4588 3050 50 0001 C CNN
F 3 "~" H 4550 3200 50 0001 C CNN
1 4550 3200
-1 0 0 1
$EndComp
Wire Wire Line
4350 4000 4650 4000
Wire Wire Line
4550 3800 4550 3350
Connection ~ 4550 3800
Wire Wire Line
4550 3800 4650 3800
Wire Wire Line
4550 3050 4550 3000
Wire Wire Line
4550 3000 4350 3000
Wire Wire Line
4350 3000 4350 3050
Connection ~ 6250 3900
Wire Wire Line
6100 3900 6250 3900
Wire Wire Line
6250 3900 6900 3900
$Comp
L Device:R R206
U 1 1 5DB0C2DA
P 6250 4050
F 0 "R206" V 6043 4050 50 0000 C CNN
F 1 "220" V 6134 4050 50 0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 6180 4050 50 0001 C CNN
F 3 "~" H 6250 4050 50 0001 C CNN
1 6250 4050
-1 0 0 1
$EndComp
$Comp
L Device:C C?
U 1 1 5E82B184
P 6700 4650
F 0 "C?" V 6952 4650 50 0000 C CNN
F 1 "2u2" V 6861 4650 50 0000 C CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 6738 4500 50 0001 C CNN
F 3 "~" H 6700 4650 50 0001 C CNN
1 6700 4650
1 0 0 -1
$EndComp
Wire Wire Line
6700 4500 6700 4350
Wire Wire Line
6700 4350 6250 4350
Connection ~ 6250 4350
Wire Wire Line
6250 4350 6250 4200
Wire Wire Line
6700 4800 6700 4900
$Comp
L power:GND #PWR?
U 1 1 5E8423F6
P 6700 4900
F 0 "#PWR?" H 6700 4650 50 0001 C CNN
F 1 "GND" H 6705 4727 50 0000 C CNN
F 2 "" H 6700 4900 50 0001 C CNN
F 3 "" H 6700 4900 50 0001 C CNN
1 6700 4900
1 0 0 -1
$EndComp
$EndSCHEMATC
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