EESchema Schematic File Version 4
LIBS:batterystation-cache
EELAYER 26 0
EELAYER END
$Descr A4 11693 8268
encoding utf-8
Sheet 6 9
Title ""
Date ""
Rev ""
Comp ""
Comment1 ""
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
$Comp
L conn:CONN_01X08 P19
U 1 1 5CBC6E54
P 6550 3150
F 0 "P19" H 6628 3191 50  0000 L CNN
F 1 "LT1512" H 6628 3100 50  0000 L CNN
F 2 "Housings_DIP:DIP-8_W7.62mm" H 6627 3054 50  0001 L CNN
F 3 "" H 6550 3150 50  0000 C CNN
	1    6550 3150
	1    0    0    -1  
$EndComp
Wire Wire Line
	5200 3100 6350 3100
Text Label 5200 3100 0    50   ~ 0
ShutdownPin
Wire Wire Line
	6350 2900 6200 2900
Wire Wire Line
	6350 3000 5950 3000
Text Label 5200 2800 0    50   ~ 0
Vcomp
Text Label 5200 2900 0    50   ~ 0
Feedback
Text Label 5200 3000 0    50   ~ 0
I_Feedback
Text Label 5200 3200 0    50   ~ 0
Vcc
Text Label 5200 3300 0    50   ~ 0
GND_S
Text Label 5200 3400 0    50   ~ 0
GND
Text Label 5200 3500 0    50   ~ 0
Vsw
Text HLabel 5200 3100 0    50   Input ~ 0
LTShutdownPin
Wire Wire Line
	4200 3200 4200 2650
Wire Wire Line
	4200 3200 4350 3200
$Comp
L power:+5V #PWR0129
U 1 1 5CBC7AC2
P 4200 2650
F 0 "#PWR0129" H 4200 2500 50  0001 C CNN
F 1 "+5V" H 4215 2823 50  0000 C CNN
F 2 "" H 4200 2650 50  0000 C CNN
F 3 "" H 4200 2650 50  0000 C CNN
	1    4200 2650
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0130
U 1 1 5CBC7C61
P 3600 3400
F 0 "#PWR0130" H 3600 3150 50  0001 C CNN
F 1 "GND" H 3605 3227 50  0000 C CNN
F 2 "" H 3600 3400 50  0000 C CNN
F 3 "" H 3600 3400 50  0000 C CNN
	1    3600 3400
	1    0    0    -1  
$EndComp
$Comp
L device:C_Small C6
U 1 1 5CBC7FC7
P 4350 3300
F 0 "C6" H 4442 3346 50  0000 L CNN
F 1 "2.2uF" H 4442 3255 50  0000 L CNN
F 2 "Capacitors_SMD:C_0805_HandSoldering" H 4350 3300 50  0001 C CNN
F 3 "" H 4350 3300 50  0000 C CNN
	1    4350 3300
	1    0    0    -1  
$EndComp
Connection ~ 4350 3200
Wire Wire Line
	4350 3200 6350 3200
Connection ~ 4350 3400
Wire Wire Line
	4350 3400 4950 3400
Wire Wire Line
	3600 3400 4350 3400
$Comp
L pspice:INDUCTOR L1
U 1 1 5CBC842B
P 4250 3750
F 0 "L1" H 4250 3965 50  0000 C CNN
F 1 "33uH" H 4250 3874 50  0000 C CNN
F 2 "Inductors:Inductor_Taiyo-Yuden_NR-60xx_HandSoldering" H 4250 3750 50  0001 C CNN
F 3 "" H 4250 3750 50  0000 C CNN
	1    4250 3750
	1    0    0    -1  
$EndComp
Wire Wire Line
	4000 3750 4000 3200
Wire Wire Line
	4000 3200 4200 3200
Connection ~ 4200 3200
Wire Wire Line
	4500 3500 4500 3750
Wire Wire Line
	4500 3500 5200 3500
Wire Wire Line
	4950 3300 4950 3400
Wire Wire Line
	4950 3300 6350 3300
Connection ~ 4950 3400
Wire Wire Line
	4950 3400 6350 3400
$Comp
L device:C_Small C8
U 1 1 5CBC8B80
P 5600 2350
F 0 "C8" V 5371 2350 50  0000 C CNN
F 1 "0.1uF" V 5462 2350 50  0000 C CNN
F 2 "Capacitors_SMD:C_0805_HandSoldering" H 5600 2350 50  0001 C CNN
F 3 "" H 5600 2350 50  0000 C CNN
	1    5600 2350
	0    1    1    0   
$EndComp
$Comp
L device:R R12
U 1 1 5CBC8C04
P 5850 2350
F 0 "R12" V 5643 2350 50  0000 C CNN
F 1 "1K" V 5734 2350 50  0000 C CNN
F 2 "Capacitors_SMD:C_0805_HandSoldering" V 5780 2350 50  0001 C CNN
F 3 "" H 5850 2350 50  0000 C CNN
	1    5850 2350
	0    1    1    0   
$EndComp
Wire Wire Line
	5500 2350 5150 2350
Wire Wire Line
	5150 2350 5150 2800
Wire Wire Line
	5150 2800 6350 2800
$Comp
L power:GND #PWR0131
U 1 1 5CBC8E91
P 6150 2350
F 0 "#PWR0131" H 6150 2100 50  0001 C CNN
F 1 "GND" H 6155 2177 50  0000 C CNN
F 2 "" H 6150 2350 50  0000 C CNN
F 3 "" H 6150 2350 50  0000 C CNN
	1    6150 2350
	1    0    0    -1  
$EndComp
Wire Wire Line
	6150 2350 6000 2350
Connection ~ 5950 3000
Wire Wire Line
	5950 3000 5200 3000
$Comp
L pspice:INDUCTOR L2
U 1 1 5CBCA135
P 5200 4150
F 0 "L2" V 5154 4228 50  0000 L CNN
F 1 "33uH" V 5245 4228 50  0000 L CNN
F 2 "Inductors:Inductor_Taiyo-Yuden_NR-60xx_HandSoldering" H 5200 4150 50  0001 C CNN
F 3 "" H 5200 4150 50  0000 C CNN
	1    5200 4150
	0    1    1    0   
$EndComp
$Comp
L device:C_Small C7
U 1 1 5CBCA445
P 5200 3750
F 0 "C7" H 4950 3650 50  0000 L CNN
F 1 "2.2uF" H 4900 3800 50  0000 L CNN
F 2 "Capacitors_SMD:C_0805_HandSoldering" H 5200 3750 50  0001 C CNN
F 3 "" H 5200 3750 50  0000 C CNN
	1    5200 3750
	1    0    0    -1  
$EndComp
Wire Wire Line
	5200 3650 5200 3500
Connection ~ 5200 3500
Wire Wire Line
	5200 3500 6350 3500
Wire Wire Line
	5200 3850 5200 3900
$Comp
L device:R R11
U 1 1 5CBCAC52
P 5450 4400
F 0 "R11" V 5550 4350 50  0000 C CNN
F 1 "24" V 5550 4500 50  0000 C CNN
F 2 "Capacitors_SMD:C_0805_HandSoldering" V 5380 4400 50  0001 C CNN
F 3 "" H 5450 4400 50  0000 C CNN
	1    5450 4400
	0    1    1    0   
$EndComp
Wire Wire Line
	5300 4400 5200 4400
Wire Wire Line
	5600 4400 5950 4400
$Comp
L device:C C9
U 1 1 5CBC988F
P 5950 4550
F 0 "C9" H 6065 4596 50  0000 L CNN
F 1 "0.22uF" H 6065 4505 50  0000 L CNN
F 2 "Capacitors_SMD:C_0805_HandSoldering" H 5988 4400 50  0001 C CNN
F 3 "" H 5950 4550 50  0000 C CNN
	1    5950 4550
	1    0    0    -1  
$EndComp
Connection ~ 5950 4400
Wire Wire Line
	5950 3000 5950 4400
$Comp
L power:GND #PWR0132
U 1 1 5CBCB68D
P 5950 4700
F 0 "#PWR0132" H 5950 4450 50  0001 C CNN
F 1 "GND" H 5955 4527 50  0000 C CNN
F 2 "" H 5950 4700 50  0000 C CNN
F 3 "" H 5950 4700 50  0000 C CNN
	1    5950 4700
	1    0    0    -1  
$EndComp
Wire Wire Line
	5200 4400 5200 4750
Connection ~ 5200 4400
$Comp
L device:R R10
U 1 1 5CBCBDA1
P 5200 4900
F 0 "R10" H 5270 4946 50  0000 L CNN
F 1 "0.2" H 5270 4855 50  0000 L CNN
F 2 "Capacitors_SMD:C_0805_HandSoldering" V 5130 4900 50  0001 C CNN
F 3 "" H 5200 4900 50  0000 C CNN
	1    5200 4900
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0133
U 1 1 5CBCC005
P 5200 5050
F 0 "#PWR0133" H 5200 4800 50  0001 C CNN
F 1 "GND" H 5205 4877 50  0000 C CNN
F 2 "" H 5200 5050 50  0000 C CNN
F 3 "" H 5200 5050 50  0000 C CNN
	1    5200 5050
	1    0    0    -1  
$EndComp
$Comp
L device:D_Schottky D2
U 1 1 5CBCC66F
P 5350 3900
F 0 "D2" H 5350 3684 50  0000 C CNN
F 1 "D_Schottky" H 5050 3750 50  0000 C CNN
F 2 "Diodes_SMD:SOD-323_HandSoldering" H 5350 3900 50  0001 C CNN
F 3 "" H 5350 3900 50  0000 C CNN
	1    5350 3900
	-1   0    0    1   
$EndComp
Connection ~ 5200 3900
Wire Wire Line
	5500 3900 6800 3900
Wire Wire Line
	7000 3900 7000 4100
$Comp
L device:R_Variable R9
U 1 1 5CBCD72A
P 3100 6500
F 0 "R9" H 2992 6454 50  0000 R CNN
F 1 "100K" H 2992 6545 50  0000 R CNN
F 2 "Pin_Headers:Pin_Header_Straight_1x04" V 3030 6500 50  0001 C CNN
F 3 "" H 3100 6500 50  0000 C CNN
	1    3100 6500
	-1   0    0    1   
$EndComp
$Comp
L device:R R13
U 1 1 5CBCD7D5
P 6800 4850
F 0 "R13" H 6870 4896 50  0000 L CNN
F 1 "12.4K" H 6870 4805 50  0000 L CNN
F 2 "Capacitors_SMD:C_0805_HandSoldering" V 6730 4850 50  0001 C CNN
F 3 "" H 6800 4850 50  0000 C CNN
	1    6800 4850
	1    0    0    -1  
$EndComp
Wire Wire Line
	6800 4600 6800 4650
Wire Wire Line
	6800 4650 6550 4650
Wire Wire Line
	6550 4650 6550 3700
Wire Wire Line
	6550 3700 6200 3700
Wire Wire Line
	6200 3700 6200 2900
Connection ~ 6800 4650
Wire Wire Line
	6800 4650 6800 4700
Connection ~ 6200 2900
Wire Wire Line
	6200 2900 5200 2900
Wire Wire Line
	7000 4100 7100 4100
Wire Wire Line
	7100 4100 7100 5250
Wire Wire Line
	7100 4100 7400 4100
Wire Wire Line
	7400 4100 7400 4500
Connection ~ 7100 4100
$Comp
L device:C_Small C10
U 1 1 5CBCF221
P 7400 4600
F 0 "C10" H 7492 4646 50  0000 L CNN
F 1 "22uF" H 7492 4555 50  0000 L CNN
F 2 "Capacitors_Tantalum_SMD:Tantalum_Case-C_EIA-6032-28_Hand" H 7400 4600 50  0001 C CNN
F 3 "" H 7400 4600 50  0000 C CNN
	1    7400 4600
	1    0    0    -1  
$EndComp
Text Notes 7500 3500 0    50   ~ 0
Two 22uF capacitors, \nare marked as electrolytic \non data sheet.\nRest can be ceramic.
Text Notes 3600 4550 0    50   ~ 0
I should've searched for \nthis symbol online first.
$Comp
L power:GND #PWR0134
U 1 1 5CBD1864
P 6800 5000
F 0 "#PWR0134" H 6800 4750 50  0001 C CNN
F 1 "GND" H 6805 4827 50  0000 C CNN
F 2 "" H 6800 5000 50  0000 C CNN
F 3 "" H 6800 5000 50  0000 C CNN
	1    6800 5000
	1    0    0    -1  
$EndComp
Text Notes 7200 2150 0    50   ~ 0
How this is tuned:\nThe V divider on Feedback pin\ndetermines float voltage.\nThe R downstream of I_feedback \n(after 24 ohm resistor)\ndetermines current (100mV / R)\nSee data sheet for more details.\nEssentially: Set float voltage on r divider\nand make sure current resistor is high enough\nto be low current.
Wire Wire Line
	6550 3700 7950 3700
Connection ~ 6550 3700
Text HLabel 7950 3700 2    50   Output ~ 0
LT_FloatVoltage
$Comp
L power:GND #PWR0135
U 1 1 5CBD2B70
P 7400 4700
F 0 "#PWR0135" H 7400 4450 50  0001 C CNN
F 1 "GND" H 7405 4527 50  0000 C CNN
F 2 "" H 7400 4700 50  0000 C CNN
F 3 "" H 7400 4700 50  0000 C CNN
	1    7400 4700
	1    0    0    -1  
$EndComp
Text HLabel 7100 5250 2    50   Input ~ 0
LT_BATCHRG
Text Notes 8150 5400 0    50   ~ 0
Example calculation for R1:\nR1 = (R2(Vbat - 1.245) )\ (1.245+R2(0.3uA))\nwith default R2 at 12,400\nDesired Vbat float of 13.8 (lead)\n(13.8 - 1.245) * 12400 == 155682\n1.245 + (12400 * .000003) == .03720 + 1.245 == 1.2822\n155682/1.2822 == 121417\n\nIt would be evil for them to put 0.3uA and\nexpect you to convert that to 0.000003A\nBut that's what they did. At least they\ngive an example to check.\n\nFive zeros on that.\n\nSee docs for more details.\n\n\n\n
Text Notes 5900 5950 0    50   ~ 0
Variable Resistor should be\na max of 120K, for lead battery\nLowest, of 1.3V for nicd (must\nbe over 1.245) would be 532\nso a 536 (E48) resistor.\n
$Comp
L device:R R5
U 1 1 5CBD3F6D
P 1950 6650
F 0 "R5" H 2020 6696 50  0000 L CNN
F 1 "536" H 2020 6605 50  0000 L CNN
F 2 "Capacitors_SMD:C_0805_HandSoldering" V 1880 6650 50  0001 C CNN
F 3 "" H 1950 6650 50  0000 C CNN
	1    1950 6650
	1    0    0    -1  
$EndComp
Wire Wire Line
	6800 3900 6800 4000
Connection ~ 6800 3900
Wire Wire Line
	6800 3900 7000 3900
Text Label 6800 4000 0    50   ~ 0
VDIVIN
Text Label 6800 4600 0    50   ~ 0
VDIVOUT
Text Notes 2800 5050 0    50   ~ 0
Voltage Divider
Text Notes 3350 5700 0    50   ~ 0
Allows switching between\n1)536 ohm for 1.3V nicad\n2)4.2lithium ion (28700ohm, use 0.1%)\n3)6V lead\n4)12V lead, but variable\n(to 20K plus 100K variable\nresistor)\n
Wire Notes Line
	4850 7050 1500 7050
Wire Notes Line
	1500 7050 1500 4850
Wire Notes Line
	1500 4850 4850 4850
Wire Notes Line
	4850 4850 4850 7050
$Comp
L device:R R8
U 1 1 5CBD820D
P 3100 6050
F 0 "R8" H 3170 6096 50  0000 L CNN
F 1 "2K" H 3170 6005 50  0000 L CNN
F 2 "Capacitors_SMD:C_0805_HandSoldering" V 3030 6050 50  0001 C CNN
F 3 "" H 3100 6050 50  0000 C CNN
	1    3100 6050
	1    0    0    -1  
$EndComp
Wire Wire Line
	3100 6350 3100 6200
Wire Wire Line
	3100 6800 3100 6650
Wire Wire Line
	2900 5700 3100 5700
Wire Wire Line
	3100 5700 3100 5900
Wire Wire Line
	2150 6300 1950 6300
Wire Wire Line
	1950 6300 1950 6500
Wire Wire Line
	2800 5300 2800 5200
Wire Wire Line
	2800 6800 3100 6800
Text Label 2800 6900 0    50   ~ 0
VDIVOUT
Text Label 2800 5200 0    50   ~ 0
VDIVIN
$Comp
L switches:SW_SP3T SW2
U 1 1 5CBDE680
P 2800 5500
F 0 "SW2" V 2754 5646 50  0000 L CNN
F 1 "SW_SP3T" V 2845 5646 50  0000 L CNN
F 2 "Buttons_Switches_SMD:SW_SP3T_PCM13" H 2175 5675 50  0001 C CNN
F 3 "" H 2175 5675 50  0000 C CNN
	1    2800 5500
	0    1    1    0   
$EndComp
$Comp
L switches:SW_DPDT_x2 SW1
U 1 1 5CBE02E2
P 2250 6100
F 0 "SW1" V 2204 6248 50  0000 L CNN
F 1 "SW_DPDT_x2" V 2150 5550 50  0000 L CNN
F 2 "Buttons_Switches_SMD:SW_SPDT_PCM12" H 2250 6100 50  0001 C CNN
F 3 "" H 2250 6100 50  0000 C CNN
	1    2250 6100
	0    1    1    0   
$EndComp
$Comp
L device:R R6
U 1 1 5CBE0901
P 2350 6650
F 0 "R6" H 2420 6696 50  0000 L CNN
F 1 "28.7K 1%" H 2420 6605 50  0000 L CNN
F 2 "Capacitors_SMD:C_0805_HandSoldering" V 2280 6650 50  0001 C CNN
F 3 "" H 2350 6650 50  0000 C CNN
	1    2350 6650
	1    0    0    -1  
$EndComp
Wire Wire Line
	1950 6800 2350 6800
Wire Wire Line
	2350 6800 2700 6800
Connection ~ 2350 6800
Connection ~ 2800 6800
Wire Wire Line
	2350 6500 2350 6300
Wire Wire Line
	2250 5900 2700 5900
Wire Wire Line
	2700 5900 2700 5700
Wire Wire Line
	2800 6800 2800 6900
$Comp
L device:R R7
U 1 1 5CBE4866
P 2700 6300
F 0 "R7" H 2770 6346 50  0000 L CNN
F 1 "54.9K" H 2770 6255 50  0000 L CNN
F 2 "Capacitors_SMD:C_0805_HandSoldering" V 2630 6300 50  0001 C CNN
F 3 "" H 2700 6300 50  0000 C CNN
	1    2700 6300
	1    0    0    -1  
$EndComp
Wire Wire Line
	2700 6150 2700 5900
Connection ~ 2700 5900
Wire Wire Line
	2700 6450 2700 6800
Connection ~ 2700 6800
Wire Wire Line
	2700 6800 2800 6800
Text HLabel 5200 4400 0    50   Input ~ 0
LT_IFEEDBACK
Text Notes 2650 3050 0    50   ~ 0
Data Sheet mentions that input surges \ncan fry 22uf input\nbut a 2.2uf ceramic will work \n(keep it close to ic).\n22uf on output should be tantalum.
$EndSCHEMATC