EESchema Schematic File Version 4
EELAYER 30 0
EELAYER END
$Descr A4 11693 8268
encoding utf-8
Sheet 4 4
Title ""
Date ""
Rev ""
Comp ""
Comment1 ""
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
$Comp
L Device:Battery BT1
U 1 1 5C046A78
P 2400 4900
F 0 "BT1" H 2508 4946 50  0000 L CNN
F 1 "Battery" H 2508 4855 50  0000 L CNN
F 2 "Connector_Wire:SolderWirePad_1x02_P3.81mm_Drill0.8mm" V 2400 4960 50  0001 C CNN
F 3 "~" V 2400 4960 50  0001 C CNN
	1    2400 4900
	1    0    0    -1  
$EndComp
Text HLabel 8800 3900 2    50   Input ~ 0
EN_5V
Text HLabel 8800 2800 2    50   Output ~ 0
5V
Text HLabel 8800 4400 2    50   Output ~ 0
3V
Text HLabel 8800 4900 2    50   Output ~ 0
GND
$Comp
L Power_Supervisor:TPS3839DBZ U4
U 1 1 5C04AEDD
P 3650 4800
F 0 "U4" H 3520 4846 50  0000 R CNN
F 1 "TPS3839K33DBZR" H 3520 4755 50  0000 R CNN
F 2 "Package_TO_SOT_SMD:SOT-23" H 3650 4800 50  0001 C CNN
F 3 "http://www.ti.com/lit/ds/sbvs193d/sbvs193d.pdf" H 3650 4800 50  0001 C CNN
F 4 "TPS3839L30DBZR" H 3650 4800 50  0001 C CNN "Mfg. ID"
F 5 "296-35473-1-ND" H 3650 4800 50  0001 C CNN "Digikey"
	1    3650 4800
	1    0    0    -1  
$EndComp
Wire Wire Line
	2400 4700 2400 4400
Wire Wire Line
	2400 4400 3650 4400
Wire Wire Line
	3650 4400 3650 4500
Wire Wire Line
	2400 5100 2400 5200
Wire Wire Line
	2400 5200 3650 5200
Wire Wire Line
	3650 5200 3650 5100
$Comp
L Device:Q_NMOS_GSD Q1
U 1 1 5C04B166
P 4600 4800
F 0 "Q1" H 4806 4846 50  0000 L CNN
F 1 "IRFML8244" H 4806 4755 50  0000 L CNN
F 2 "Package_TO_SOT_SMD:SOT-23_Handsoldering" H 4800 4900 50  0001 C CNN
F 3 "~" H 4600 4800 50  0001 C CNN
F 4 "IRFML8244TRPBF" H 4600 4800 50  0001 C CNN "Mfg. ID"
F 5 "IRFML8244TRPBFCT-ND" H 4600 4800 50  0001 C CNN "Digikey"
	1    4600 4800
	1    0    0    -1  
$EndComp
Wire Wire Line
	4050 4800 4200 4800
Wire Wire Line
	3650 5200 4200 5200
Wire Wire Line
	4700 5200 4700 5000
Connection ~ 3650 5200
Text Notes 3900 5400 0    50   ~ 0
disconnect battery when\nvoltage drops below 3V
$Comp
L Regulator_Linear:MCP1700-3302E_SOT89 U5
U 1 1 5C04B605
P 6400 4400
F 0 "U5" H 6400 4642 50  0000 C CNN
F 1 "MCP1700-3302E_SOT89" H 6400 4551 50  0000 C CNN
F 2 "Package_TO_SOT_SMD:SOT-89-3" H 6400 4600 50  0001 C CNN
F 3 "http://ww1.microchip.com/downloads/en/DeviceDoc/20001826C.pdf" H 6400 4350 50  0001 C CNN
F 4 "MCP1700T-3302E/MB" H 6400 4400 50  0001 C CNN "Mfg. ID"
F 5 "MCP1700T3302EMBCT-ND" H 6400 4400 50  0001 C CNN "Digikey"
	1    6400 4400
	1    0    0    -1  
$EndComp
$Comp
L Device:C C6
U 1 1 5C04B886
P 6000 4650
F 0 "C6" H 5886 4604 50  0000 R CNN
F 1 "10uF" H 5886 4695 50  0000 R CNN
F 2 "Capacitor_SMD:C_0805_2012Metric" H 6038 4500 50  0001 C CNN
F 3 "~" H 6000 4650 50  0001 C CNN
	1    6000 4650
	1    0    0    1   
$EndComp
$Comp
L Device:C C7
U 1 1 5C04BAA8
P 6800 4650
F 0 "C7" H 6915 4696 50  0000 L CNN
F 1 "10uF" H 6915 4605 50  0000 L CNN
F 2 "Capacitor_SMD:C_0805_2012Metric" H 6838 4500 50  0001 C CNN
F 3 "~" H 6800 4650 50  0001 C CNN
F 4 "LMK212F106ZG-T" H 6800 4650 50  0001 C CNN "Mfg. ID"
F 5 "587-1312-1-ND" H 6800 4650 50  0001 C CNN "Digikey"
	1    6800 4650
	1    0    0    -1  
$EndComp
Wire Wire Line
	6100 4400 6000 4400
Wire Wire Line
	6000 4400 6000 4500
Wire Wire Line
	6700 4400 6800 4400
Wire Wire Line
	6800 4400 6800 4500
Connection ~ 6800 4400
Wire Wire Line
	6800 4800 6800 4900
Wire Wire Line
	6800 4900 6400 4900
Wire Wire Line
	6000 4900 6000 4800
Wire Wire Line
	6400 4700 6400 4900
Connection ~ 6400 4900
Wire Wire Line
	6400 4900 6000 4900
Wire Wire Line
	6800 4900 8700 4900
Connection ~ 6800 4900
$Comp
L Regulator_Switching:MCP1640CH U6
U 1 1 5C04CA8E
P 6900 3200
F 0 "U6" H 6900 3667 50  0000 C CNN
F 1 "MCP1640T-I/CHY" H 6900 3576 50  0000 C CNN
F 2 "Package_TO_SOT_SMD:SOT-23-6" H 6950 2950 50  0001 L CIN
F 3 "http://ww1.microchip.com/downloads/en/DeviceDoc/20002234D.pdf" H 6650 3650 50  0001 C CNN
F 4 "MCP1640T-I/CHY" H 6900 3200 50  0001 C CNN "Mfg. ID"
F 5 "MCP1640T-I/CHYCT-ND" H 6900 3200 50  0001 C CNN "Digikey"
	1    6900 3200
	1    0    0    -1  
$EndComp
$Comp
L Device:C C5
U 1 1 5C04CDCE
P 6000 3350
F 0 "C5" H 5886 3304 50  0000 R CNN
F 1 "10uF" H 5886 3395 50  0000 R CNN
F 2 "Capacitor_SMD:C_0805_2012Metric" H 6038 3200 50  0001 C CNN
F 3 "~" H 6000 3350 50  0001 C CNN
	1    6000 3350
	1    0    0    1   
$EndComp
$Comp
L Device:L L1
U 1 1 5C04CECD
P 6850 2600
F 0 "L1" V 7040 2600 50  0000 C CNN
F 1 "4.7uH" V 6949 2600 50  0000 C CNN
F 2 "Inductor_SMD:L_Taiyo-Yuden_NR-40xx" H 6850 2600 50  0001 C CNN
F 3 "~" H 6850 2600 50  0001 C CNN
F 4 "Taiyo Yuden  NRS4018T4R7MDGJ" H 6850 2600 50  0001 C CNN "Mfg. ID"
F 5 "587-2893-1-ND" V 6850 2600 50  0001 C CNN "Digikey"
	1    6850 2600
	0    -1   -1   0   
$EndComp
$Comp
L Device:R R1
U 1 1 5C04CF6D
P 7800 3050
F 0 "R1" H 7870 3096 50  0000 L CNN
F 1 "976K" H 7870 3005 50  0000 L CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 7730 3050 50  0001 C CNN
F 3 "~" H 7800 3050 50  0001 C CNN
	1    7800 3050
	1    0    0    -1  
$EndComp
$Comp
L Device:R R2
U 1 1 5C04D017
P 7800 3550
F 0 "R2" H 7870 3596 50  0000 L CNN
F 1 "309K" H 7870 3505 50  0000 L CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 7730 3550 50  0001 C CNN
F 3 "~" H 7800 3550 50  0001 C CNN
	1    7800 3550
	1    0    0    -1  
$EndComp
$Comp
L Device:C C8
U 1 1 5C04D070
P 8200 3300
F 0 "C8" H 8315 3346 50  0000 L CNN
F 1 "10uF" H 8315 3255 50  0000 L CNN
F 2 "Capacitor_SMD:C_0805_2012Metric" H 8238 3150 50  0001 C CNN
F 3 "~" H 8200 3300 50  0001 C CNN
	1    8200 3300
	1    0    0    -1  
$EndComp
Wire Wire Line
	7300 3000 7400 3000
Wire Wire Line
	7400 3000 7400 2600
Wire Wire Line
	7400 2600 7000 2600
Wire Wire Line
	6700 2600 6400 2600
Wire Wire Line
	6400 2600 6400 3000
Wire Wire Line
	6400 3000 6500 3000
Wire Wire Line
	7800 3200 7800 3300
Wire Wire Line
	7800 3300 7300 3300
Connection ~ 7800 3300
Wire Wire Line
	7800 3300 7800 3400
Wire Wire Line
	7800 3700 7800 3800
Wire Wire Line
	7800 3800 6900 3800
Wire Wire Line
	6900 3800 6900 3500
Wire Wire Line
	7800 3800 8200 3800
Wire Wire Line
	8200 3800 8200 3450
Connection ~ 7800 3800
Wire Wire Line
	8200 3150 8200 2800
Wire Wire Line
	8200 2800 7800 2800
Wire Wire Line
	7800 2800 7800 2900
Connection ~ 8200 2800
Wire Wire Line
	7800 2800 7600 2800
Wire Wire Line
	7600 2800 7600 3100
Wire Wire Line
	7600 3100 7300 3100
Connection ~ 7800 2800
Wire Wire Line
	6400 3000 6000 3000
Wire Wire Line
	6000 3000 6000 3200
Connection ~ 6400 3000
Wire Wire Line
	6900 3800 6000 3800
Wire Wire Line
	6000 3800 6000 3500
Connection ~ 6900 3800
Wire Wire Line
	4100 4400 4100 3000
Wire Wire Line
	4100 3000 6000 3000
Connection ~ 3650 4400
Connection ~ 6000 3000
Connection ~ 6000 4400
Wire Wire Line
	4700 4600 4700 4500
Wire Wire Line
	4700 4500 5600 4500
Wire Wire Line
	5600 4500 5600 4900
Wire Wire Line
	5600 4900 6000 4900
Connection ~ 6000 4900
Wire Wire Line
	4700 4500 4700 3800
Wire Wire Line
	4700 3800 6000 3800
Connection ~ 6000 3800
Wire Wire Line
	8800 3900 6400 3900
Wire Wire Line
	6400 3900 6400 3200
Wire Wire Line
	6400 3200 6500 3200
Text Notes 6200 2400 0    50   ~ 0
5V is only needed for the LEDs and can\nbe switched off when the LEDs are off
Wire Notes Line
	2850 5400 2850 4300
Wire Notes Line
	2850 4300 5300 4300
Wire Notes Line
	5300 4300 5300 5400
Wire Notes Line
	5300 5400 2850 5400
Connection ~ 4700 4500
Wire Wire Line
	4100 4400 6000 4400
Wire Wire Line
	3650 4400 4100 4400
Wire Notes Line
	5700 4000 5700 2200
Wire Notes Line
	5700 2200 8500 2200
Wire Notes Line
	8500 2200 8500 4000
Wire Notes Line
	8500 4000 5700 4000
Wire Notes Line
	5500 4100 5500 5000
Wire Notes Line
	5500 5000 7100 5000
Wire Notes Line
	7100 5000 7100 4100
Wire Notes Line
	7100 4100 5500 4100
$Comp
L Device:D_Zener_Small D1
U 1 1 5C061381
P 4200 5000
F 0 "D1" V 4154 5068 50  0000 L CNN
F 1 "ESD3Z12" V 4245 5068 50  0000 L CNN
F 2 "Diode_SMD:D_SOD-323_HandSoldering" V 4200 5000 50  0001 C CNN
F 3 "~" V 4200 5000 50  0001 C CNN
	1    4200 5000
	0    1    1    0   
$EndComp
Connection ~ 4100 4400
Wire Wire Line
	4200 4800 4200 4900
Connection ~ 4200 4800
Wire Wire Line
	4200 4800 4400 4800
Wire Wire Line
	4200 5100 4200 5200
Connection ~ 4200 5200
Wire Wire Line
	4200 5200 4700 5200
$Comp
L power:PWR_FLAG #FLG0103
U 1 1 5EE2DDEB
P 8700 4900
F 0 "#FLG0103" H 8700 4975 50  0001 C CNN
F 1 "PWR_FLAG" H 8700 5073 50  0000 C CNN
F 2 "" H 8700 4900 50  0001 C CNN
F 3 "~" H 8700 4900 50  0001 C CNN
	1    8700 4900
	1    0    0    -1  
$EndComp
Connection ~ 8700 4900
Wire Wire Line
	8700 4900 8800 4900
$Comp
L power:PWR_FLAG #FLG0104
U 1 1 5EE31D89
P 2400 4400
F 0 "#FLG0104" H 2400 4475 50  0001 C CNN
F 1 "PWR_FLAG" H 2400 4573 50  0000 C CNN
F 2 "" H 2400 4400 50  0001 C CNN
F 3 "~" H 2400 4400 50  0001 C CNN
	1    2400 4400
	1    0    0    -1  
$EndComp
Connection ~ 2400 4400
Wire Wire Line
	6800 4400 8800 4400
Wire Wire Line
	8200 2800 8800 2800
$Comp
L power:PWR_FLAG #FLG0101
U 1 1 5EE39E09
P 2400 5200
F 0 "#FLG0101" H 2400 5275 50  0001 C CNN
F 1 "PWR_FLAG" H 2400 5373 50  0000 C CNN
F 2 "" H 2400 5200 50  0001 C CNN
F 3 "~" H 2400 5200 50  0001 C CNN
	1    2400 5200
	-1   0    0    1   
$EndComp
Connection ~ 2400 5200
$EndSCHEMATC