RFIDr_Open_PMU_CORE.sch

EESchema Schematic File Version 4
EELAYER 30 0
EELAYER END
$Descr A 11000 8500
encoding utf-8
Sheet 11 17
Title "RFIDr_Open_PMU_CORE"
Date "2020-05-21"
Rev "A"
Comp "Superlative Semiconductor LLC"
Comment1 "Copyright 2021 Superlative Semiconductor LLC."
Comment2 "Licensed under CERN-OHL-P v2 or later."
Comment3 "This source provided WITHOUT ANY EXPRESS OR IMPLIED WARRANTY."
Comment4 "Author: E. Keehr"
$EndDescr
$Comp
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F 1 "BQ24073" H 6100 3450 60  0000 C CNN
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F 3 "" H 5300 3350 60  0000 C CNN
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	1    0    0    -1  
$EndComp
Text Label 2075 3550 0    60   ~ 0
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L Device:R R41
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F 1 "0" V 4525 3850 50  0000 C CNN
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F 3 "" H 4525 3850 30  0000 C CNN
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$EndComp
Text Label 4725 3650 0    60   ~ 0
VBAT
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$Comp
L Device:R R44
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F 1 "0" V 5250 4300 50  0000 C CNN
F 2 "Resistors_SMD:R_0402" V 5400 4300 30  0000 C CNN
F 3 "" H 5250 4300 30  0000 C CNN
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	0    1    1    0   
$EndComp
$Comp
L Device:R R45
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F 1 "0" V 5250 4550 50  0000 C CNN
F 2 "Resistors_SMD:R_0402" V 5400 4550 30  0000 C CNN
F 3 "" H 5250 4550 30  0000 C CNN
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	0    1    1    0   
$EndComp
$Comp
L Device:R R49
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F 1 "1.1k" V 6875 3550 50  0000 C CNN
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F 3 "" H 6875 3550 30  0000 C CNN
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	0    -1   -1   0   
$EndComp
$Comp
L Device:R R46
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F 1 "1.13k" V 5500 2700 50  0000 C CNN
F 2 "Resistors_SMD:R_0402" V 5425 2350 30  0000 C CNN
F 3 "" H 5500 2700 30  0000 C CNN
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	-1   0    0    1   
$EndComp
$Comp
L Device:R R48
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F 1 "46.8k" V 5925 2700 50  0000 C CNN
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F 3 "" H 5925 2700 30  0000 C CNN
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$EndComp
Text Label 5500 3150 1    60   ~ 0
ISET
Text Label 5700 3175 1    60   ~ 0
TMR
Text Label 6375 3550 0    60   ~ 0
ILIM
Text HLabel 7850 3100 2    60   BiDi ~ 0
VBUS
$Comp
L Device:R R47
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F 1 "0" V 5700 2700 50  0000 C CNN
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F 3 "" H 5700 2700 30  0000 C CNN
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	-1   0    0    1   
$EndComp
Text Label 5600 3150 1    60   ~ 0
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$Comp
L Device:C_Small C44
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F 3 "" H 7625 3300 60  0000 C CNN
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$EndComp
$Comp
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F 3 "" H 3350 3550 30  0000 C CNN
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$EndComp
$Comp
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F 1 "15k" V 3600 3825 50  0000 C CNN
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F 3 "" H 3600 3825 30  0000 C CNN
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$EndComp
$Comp
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F 1 "TESTPOINT" H 3000 3300 30  0001 C CNN
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F 3 "" H 3000 3350 60  0000 C CNN
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	0    1    1    0   
$EndComp
$Comp
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F 1 "GND" H 3600 3875 50  0000 C CNN
F 2 "" H 3600 4025 60  0000 C CNN
F 3 "" H 3600 4025 60  0000 C CNN
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$EndComp
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F 1 "GND" V 5500 2325 50  0000 C CNN
F 2 "" H 5500 2500 60  0000 C CNN
F 3 "" H 5500 2500 60  0000 C CNN
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	-1   0    0    1   
$EndComp
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F 1 "GND" V 5700 2325 50  0000 C CNN
F 2 "" H 5700 2500 60  0000 C CNN
F 3 "" H 5700 2500 60  0000 C CNN
	1    5700 2500
	-1   0    0    1   
$EndComp
$Comp
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F 1 "GND" V 5925 2325 50  0000 C CNN
F 2 "" H 5925 2500 60  0000 C CNN
F 3 "" H 5925 2500 60  0000 C CNN
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$EndComp
$Comp
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F 1 "GND" V 7675 3375 50  0000 C CNN
F 2 "" H 7675 3550 60  0000 C CNN
F 3 "" H 7675 3550 60  0000 C CNN
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	0    -1   -1   0   
$EndComp
$Comp
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F 1 "GND" H 4325 3700 50  0000 C CNN
F 2 "" H 4325 3850 60  0000 C CNN
F 3 "" H 4325 3850 60  0000 C CNN
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	0    1    1    0   
$EndComp
$Comp
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F 2 "" H 5050 4550 60  0000 C CNN
F 3 "" H 5050 4550 60  0000 C CNN
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	0    1    1    0   
$EndComp
$Comp
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F 2 "" H 5800 4275 60  0000 C CNN
F 3 "" H 5800 4275 60  0000 C CNN
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	1    0    0    -1  
$EndComp
$Comp
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F 1 "GND" V 5275 2325 50  0000 C CNN
F 2 "" H 5275 2500 60  0000 C CNN
F 3 "" H 5275 2500 60  0000 C CNN
	1    5275 2500
	-1   0    0    1   
$EndComp
Text Label 3900 3550 2    60   ~ 0
TS
Text HLabel 4500 3650 0    60   BiDi ~ 0
VBAT
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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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Wire Wire Line
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Wire Wire Line
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Connection ~ 7625 3550
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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Wire Wire Line
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Wire Wire Line
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Connection ~ 4650 3650
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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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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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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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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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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Wire Wire Line
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Connection ~ 6550 3750
Wire Wire Line
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Wire Wire Line
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Connection ~ 7625 3100
Wire Wire Line
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Wire Wire Line
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Connection ~ 3600 3550
Wire Wire Line
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Wire Wire Line
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Connection ~ 2900 3550
Connection ~ 5700 5350
Wire Wire Line
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Connection ~ 6400 5050
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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Wire Wire Line
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Text Label 5225 5050 0    60   ~ 0
CHGB
Text Label 5200 5350 0    60   ~ 0
PGOODB
$Comp
L RFIDr_Open_Lib:LED-RFIDr_Open D5
U 1 1 5E2FF32D
P 4975 5350
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F 1 "LED_YLW" H 4975 5250 50  0000 C CNN
F 2 "RFIDr_Open:LED_0603" H 4950 5525 30  0000 C CNN
F 3 "" H 4975 5350 60  0000 C CNN
	1    4975 5350
	-1   0    0    1   
$EndComp
$Comp
L RFIDr_Open_Lib:LED-RFIDr_Open D4
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F 1 "LED_GRN" H 4975 4950 50  0000 C CNN
F 2 "RFIDr_Open:LED_0603" H 4975 4875 30  0000 C CNN
F 3 "" H 4975 5050 60  0000 C CNN
	1    4975 5050
	-1   0    0    1   
$EndComp
$Comp
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P 4475 5050
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F 1 "470" V 4475 5050 50  0000 C CNN
F 2 "Resistors_SMD:R_0402" V 4525 4675 30  0000 C CNN
F 3 "" H 4475 5050 30  0000 C CNN
	1    4475 5050
	0    1    1    0   
$EndComp
$Comp
L Device:R R40
U 1 1 5E2FF342
P 4475 5350
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F 1 "470" V 4475 5350 50  0000 C CNN
F 2 "Resistors_SMD:R_0402" V 4525 4975 30  0000 C CNN
F 3 "" H 4475 5350 30  0000 C CNN
	1    4475 5350
	0    1    1    0   
$EndComp
Text HLabel 6400 5400 3    60   Output ~ 0
CHGB
Text HLabel 5700 5400 3    60   Output ~ 0
PGOODB
$Comp
L Device:C_Small C124
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P 7625 3950
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F 1 "10u" H 7650 3875 50  0000 L CNN
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F 3 "" H 7625 3950 60  0000 C CNN
	1    7625 3950
	1    0    0    -1  
$EndComp
$Comp
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F 1 "GND" H 7625 4000 50  0000 C CNN
F 2 "" H 7625 4150 60  0000 C CNN
F 3 "" H 7625 4150 60  0000 C CNN
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$EndComp
Wire Wire Line
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Wire Wire Line
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Connection ~ 7625 3750
Text HLabel 2050 3550 0    60   BiDi ~ 0
THERMOCOUPLE
Text HLabel 8950 3750 2    60   BiDi ~ 0
OUT
Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Connection ~ 8650 3750
Connection ~ 3725 5350
Connection ~ 3725 5050
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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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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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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Text Notes 6375 2375 0    50   ~ 0
Design Note: EN2=HI, EN1=LO means ILIM=K_ILIM/R_ILIM=1500/1.1kOhm=1.36A.\nNote that this does not give much margin to the 1A required for PA operation.\nHowever, this is the minimum R_ILIM resistor value available.
Text Notes 6375 2750 0    50   ~ 0
Design Note: Battery Fast Charge Current is K_ISET/R_SET=(797 to 975)/1,13kOhms=0.7A to 0.86A.\nThe 1.13kOhm value was taken from the BQ24073 data sheet typical application circuit.
Text Notes 3725 6475 0    50   ~ 0
Design Note: LED resistors should probably be increased to 2kOhms \nin future iterations to save current/reduce LED brightness.
Text Notes 950  4125 0    50   ~ 0
Design Note: R42 emulates the resistance of the thermistor.\nIf the real thermistor is not present, a dummy thermistor \nto ground must be present for the BQ24073 to work. \nOn second inspection, R42 should have been 10kOhms.
Text Notes 6725 6550 0    50   ~ 0
Design Note: For Input below the OVP threshold and above 4.4V, output is 4.4V.\nWhen the input is out of the operation range, OUT is connected to the battery.\n(From BQ24073 data sheet).\n
Wire Notes Line
	3675 6275 3675 6525
Wire Notes Line
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Wire Notes Line
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Wire Notes Line
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Wire Notes Line
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Wire Notes Line
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Wire Notes Line
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Wire Notes Line
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Wire Notes Line
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Wire Notes Line
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Wire Notes Line
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Wire Notes Line
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Wire Notes Line
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Wire Notes Line
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Wire Notes Line
	10350 2800 10350 2550
Wire Notes Line
	10350 2550 6325 2550
Text Notes 925  1850 0    100  ~ 0
Schematic Summary: PMU_CORE\nThis schematic encapsulates the BQ24073 and its associated passives.\nBQ24073 is an integrated Li-Ion charging solution which accepts power\nfrom a 5V source which it can use to charge a battery or to power a device.\nIn the absence of external power, the BQ24073 routes battery power to the\ndevice's internal circuity. Operation of the reader with battery has not yet\nbeen tested.
Wire Notes Line
	875  700  875  1925
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	875  1925 7000 1925
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	7000 1925 7000 700 
Wire Notes Line
	7000 700  875  700 
Text Notes 3750 3300 0    100  ~ 0
BQ24073 Li-Ion\nCharge Management\nASIC
$EndSCHEMATC