EESchema Schematic File Version 2 LIBS:power LIBS:device LIBS:transistors LIBS:conn LIBS:linear LIBS:regul LIBS:74xx LIBS:cmos4000 LIBS:adc-dac LIBS:memory LIBS:xilinx LIBS:special LIBS:microcontrollers LIBS:dsp LIBS:microchip LIBS:analog_switches LIBS:motorola LIBS:texas LIBS:intel LIBS:audio LIBS:interface LIBS:digital-audio LIBS:philips LIBS:display LIBS:cypress LIBS:siliconi LIBS:opto LIBS:atmel LIBS:contrib LIBS:valves LIBS:max31855 LIBS:thermocouple_module-cache EELAYER 27 0 EELAYER END $Descr A4 11693 8268 encoding utf-8 Sheet 1 1 Title "Electronic Industrial Temperature Interface (EITI)" Date "28 may 2014" Rev ".001" Comp "Mrk Industries" Comment1 "" Comment2 "" Comment3 "" Comment4 "" $EndDescr NoConn ~ 4075 4350 NoConn ~ 3875 4350 $Comp L VIA V802 U 1 1 4F629521 P 3875 4350 F 0 "V802" V 3900 4450 20 0000 C CNN F 1 "VIA" H 3875 4550 60 0001 C CNN F 2 "1pin" H 3875 4650 60 0001 C CNN F 3 "" H 3875 4350 60 0001 C CNN 1 3875 4350 0 1 1 0 $EndComp Text Notes 3900 4950 0 40 ~ 0 We want a big mass of copper in the\nTCPL joints, to dampen the cold junction\ntemperature and to make it more measurable\nwith this IC Text Notes 3725 4450 0 40 ~ 0 Via for cable tie $Comp L VIA V801 U 1 1 4F627FCA P 4075 4350 F 0 "V801" V 4100 4450 20 0000 C CNN F 1 "VIA" H 4075 4550 60 0001 C CNN F 2 "1pin" H 4075 4350 60 0001 C CNN F 3 "" H 4075 4350 60 0001 C CNN 1 4075 4350 0 1 1 0 $EndComp Connection ~ 4800 4650 Wire Wire Line 4800 4550 4800 4650 Wire Wire Line 4700 4050 5150 4050 Wire Wire Line 5150 4050 5150 4350 Wire Wire Line 5150 4350 5400 4350 Wire Wire Line 4700 4650 5150 4650 Wire Wire Line 5150 4650 5150 4450 Wire Wire Line 5150 4450 5400 4450 Wire Wire Line 4800 4150 4800 4050 Connection ~ 4800 4050 $Comp L C C21 U 1 1 4E4C6B54 P 4800 4350 F 0 "C21" H 4850 4450 50 0000 L CNN F 1 "10nF" H 4850 4250 50 0000 L CNN F 2 "SM0805-SM0603" H 4850 4350 50 0001 C CNN F 3 "" H 4800 4350 60 0001 C CNN 1 4800 4350 1 0 0 -1 $EndComp Text Notes 7250 4350 0 30 ~ 0 Care must be taken with the conector\nchosen for the TCPL to avoid inaccuracies.\n\nAlso, the connector must be as close as\npossible to the cold-juntion compensation. Text Notes 5500 3650 0 40 ~ 0 MAX31855\nCold-Junction Compensated\nThermocouple-to-Digital Converter Text Notes 5600 4900 0 30 ~ 0 Datasheet:\nhttp://datasheets.maxim-ic.com/en/ds/MAX31855.pdf NoConn ~ 6500 4250 $Comp L GND #PWR01 U 1 1 4E13FFF9 P 7000 4000 F 0 "#PWR01" H 7000 4000 30 0001 C CNN F 1 "GND" H 7000 3930 30 0001 C CNN F 2 "" H 7000 4000 60 0001 C CNN F 3 "" H 7000 4000 60 0001 C CNN 1 7000 4000 1 0 0 -1 $EndComp Text GLabel 7000 3600 0 40 Input ~ 0 3.3v $Comp L C C8 U 1 1 4E13FFE2 P 7000 3800 F 0 "C8" H 7050 3900 50 0000 L CNN F 1 "100nF" H 7050 3700 50 0000 L CNN F 2 "SM0805-SM0603" H 7050 3800 50 0001 C CNN F 3 "" H 7000 3800 60 0001 C CNN 1 7000 3800 1 0 0 -1 $EndComp $Comp L GND #PWR02 U 1 1 4E13FFDB P 5400 4250 F 0 "#PWR02" H 5400 4250 30 0001 C CNN F 1 "GND" H 5400 4180 30 0001 C CNN F 2 "" H 5400 4250 60 0001 C CNN F 3 "" H 5400 4250 60 0001 C CNN 1 5400 4250 1 0 0 -1 $EndComp Text GLabel 5400 4550 0 40 Input ~ 0 3.3v $Comp L MAX31855 U5 U 1 1 4E13FF86 P 5950 4400 F 0 "U5" H 5950 4650 60 0000 C CNN F 1 "MAX31855KASA" H 5950 4150 60 0000 C CNN F 2 "SO8E" H 5950 4200 60 0001 C CNN F 3 "" H 5950 4400 60 0001 C CNN F 4 "MAX31855KASA+" H 5950 4400 60 0001 C CNN "mfg#" 1 5950 4400 1 0 0 -1 $EndComp $Comp L CONN_2 P1 U 1 1 535A15DB P 4350 4350 F 0 "P1" V 4300 4350 40 0000 C CNN F 1 "CONN_2" V 4400 4350 40 0000 C CNN F 2 "tcpl_PCC-SMP" H 4350 4350 60 0001 C CNN F 3 "" H 4350 4350 60 0000 C CNN 1 4350 4350 -1 0 0 -1 $EndComp Wire Wire Line 4700 4450 4700 4650 Wire Wire Line 4700 4250 4700 4050 $Comp L CONN_4 P3 U 1 1 535A166C P 7100 4550 F 0 "P3" V 7050 4550 50 0000 C CNN F 1 "CONN_4" V 7150 4550 50 0000 C CNN F 2 "SIL-4" H 7100 4550 60 0001 C CNN F 3 "" H 7100 4550 60 0000 C CNN 1 7100 4550 1 0 0 -1 $EndComp Wire Wire Line 6500 4350 6500 4400 Wire Wire Line 6500 4400 6750 4400 Wire Wire Line 6500 4450 6500 4500 Wire Wire Line 6500 4500 6750 4500 Wire Wire Line 6500 4550 6500 4600 Wire Wire Line 6500 4600 6750 4600 Wire Wire Line 5400 4550 5400 4700 Wire Wire Line 5400 4700 6750 4700 $Comp L CONN_1 P2 U 1 1 535A1737 P 5400 4100 F 0 "P2" H 5480 4100 40 0000 L CNN F 1 "CONN_1" H 5400 4155 30 0001 C CNN F 2 "SIL-1" H 5400 4100 60 0001 C CNN F 3 "" H 5400 4100 60 0000 C CNN 1 5400 4100 0 -1 -1 0 $EndComp Connection ~ 5400 4250 $Comp L CONN_2 P4 U 1 1 535A1B1D P 4350 3650 F 0 "P4" V 4300 3650 40 0000 C CNN F 1 "CONN_2" V 4400 3650 40 0000 C CNN F 2 "SIL-2" H 4350 3650 60 0001 C CNN F 3 "" H 4350 3650 60 0000 C CNN 1 4350 3650 -1 0 0 1 $EndComp Text Label 4700 4250 1 40 ~ 0 TCPL- Text Label 4700 4650 1 40 ~ 0 TCPL+ Text Label 4700 3550 0 40 ~ 0 TCPL- Text Label 4700 3750 0 40 ~ 0 TCPL+ Text Label 6500 4350 2 40 ~ 0 MISO Text Label 6500 4450 2 40 ~ 0 /CS Text Label 6500 4550 2 40 ~ 0 SCK $EndSCHEMATC