EESchema Schematic File Version 4 EELAYER 30 0 EELAYER END $Descr USLetter 11000 8500 encoding utf-8 Sheet 1 1 Title "HP-28S Calculator Battery Upgrade" Date "2021-10-14" Rev "1.1" Comp "tomcircuit@gmail.com" Comment1 "https://github.com/tomcircuit/HP28_Calculator" Comment2 "https://hackaday.io/project/181957-hp-28s-lipo-battery" Comment3 "" Comment4 "" $EndDescr $Comp L Battery_Management:MCP73831-2-OT U1 U 1 1 5FA2FB74 P 5000 3900 F 0 "U1" H 5000 4500 50 0000 C CNN F 1 "MCP73831-2-OT" H 5000 4400 50 0000 C CNN F 2 "Package_TO_SOT_SMD:SOT-23-5_HandSoldering" H 5050 3650 50 0001 L CIN F 3 "http://ww1.microchip.com/downloads/en/DeviceDoc/20001984g.pdf" H 4850 3850 50 0001 C CNN F 4 "Microchip MCP73831T-2ACI/OT" H 5000 3900 50 0001 C CNN "MPN" F 5 "MCP73831T-2ACI/OTCT-ND" H 5000 3900 50 0001 C CNN "DigiKey" 1 5000 3900 1 0 0 -1 $EndComp $Comp L HP28S_battery-rescue:USB_B_Micro-Connector-HP28S_battery-rescue J1 U 1 1 5FA30285 P 3300 3700 F 0 "J1" H 3357 4167 50 0000 C CNN F 1 "USB_B_Micro" H 3357 4076 50 0000 C CNN F 2 "Connector_USB:USB_Micro-B_Molex-105017-0001" H 3450 3650 50 0001 C CNN F 3 "~" H 3450 3650 50 0001 C CNN F 4 "Molex 105017001" H 3300 3700 50 0001 C CNN "MPN" F 5 "WM10134CT-ND" H 3300 3700 50 0001 C CNN "DigiKey" 1 3300 3700 1 0 0 -1 $EndComp $Comp L Device:R R1 U 1 1 5FA320F0 P 4450 4250 F 0 "R1" H 4520 4296 50 0000 L CNN F 1 "10K" H 4520 4205 50 0000 L CNN F 2 "Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder" V 4380 4250 50 0001 C CNN F 3 "~" H 4450 4250 50 0001 C CNN 1 4450 4250 1 0 0 -1 $EndComp $Comp L power:GND #PWR04 U 1 1 5FA32E41 P 5000 4500 F 0 "#PWR04" H 5000 4250 50 0001 C CNN F 1 "GND" H 5005 4327 50 0000 C CNN F 2 "" H 5000 4500 50 0001 C CNN F 3 "" H 5000 4500 50 0001 C CNN 1 5000 4500 1 0 0 -1 $EndComp $Comp L power:GND #PWR03 U 1 1 5FA334E1 P 4450 4500 F 0 "#PWR03" H 4450 4250 50 0001 C CNN F 1 "GND" H 4455 4327 50 0000 C CNN F 2 "" H 4450 4500 50 0001 C CNN F 3 "" H 4450 4500 50 0001 C CNN 1 4450 4500 1 0 0 -1 $EndComp Wire Wire Line 4450 4500 4450 4400 Wire Wire Line 4450 4100 4450 4000 Wire Wire Line 4450 4000 4600 4000 Wire Wire Line 5000 4200 5000 4500 Wire Wire Line 5400 4000 5550 4000 Wire Wire Line 5000 3500 5000 3600 $Comp L power:GND #PWR02 U 1 1 5FA361D6 P 4050 4500 F 0 "#PWR02" H 4050 4250 50 0001 C CNN F 1 "GND" H 4055 4327 50 0000 C CNN F 2 "" H 4050 4500 50 0001 C CNN F 3 "" H 4050 4500 50 0001 C CNN 1 4050 4500 1 0 0 -1 $EndComp Connection ~ 5000 3500 Wire Wire Line 5400 3800 6050 3800 $Comp L Device:C_Small C1 U 1 1 5FA386FD P 4050 4000 F 0 "C1" H 4142 4046 50 0000 L CNN F 1 "4.7uF" H 4142 3955 50 0000 L CNN F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 4050 4000 50 0001 C CNN F 3 "~" H 4050 4000 50 0001 C CNN F 4 "16V" H 4200 3850 50 0000 C CNN "WVDC" F 5 "MuRata GRM21BR71C475KE51L" H 4050 4000 50 0001 C CNN "MPN" F 6 "490-14466-1-ND" H 4050 4000 50 0001 C CNN "DigiKey" 1 4050 4000 1 0 0 -1 $EndComp Wire Wire Line 4050 3500 4050 3900 Wire Wire Line 6050 3500 6350 3500 Wire Wire Line 6050 3500 6050 3800 $Comp L power:GND #PWR05 U 1 1 5FA3C234 P 6350 4500 F 0 "#PWR05" H 6350 4250 50 0001 C CNN F 1 "GND" H 6355 4327 50 0000 C CNN F 2 "" H 6350 4500 50 0001 C CNN F 3 "" H 6350 4500 50 0001 C CNN 1 6350 4500 1 0 0 -1 $EndComp Wire Wire Line 6350 3900 6350 3500 Wire Wire Line 3200 4100 3200 4200 Wire Wire Line 3200 4200 3300 4200 Wire Wire Line 3300 4200 3300 4100 $Comp L power:GND #PWR01 U 1 1 5FA3F829 P 3300 4500 F 0 "#PWR01" H 3300 4250 50 0001 C CNN F 1 "GND" H 3305 4327 50 0000 C CNN F 2 "" H 3300 4500 50 0001 C CNN F 3 "" H 3300 4500 50 0001 C CNN 1 3300 4500 1 0 0 -1 $EndComp Wire Wire Line 3300 4200 3300 4400 Connection ~ 3300 4200 Wire Wire Line 4050 4100 4050 4500 Text Label 3800 3500 0 50 ~ 0 VUSB Text Label 6500 3500 0 50 ~ 0 POS Wire Wire Line 5550 4550 5850 4550 Wire Wire Line 5850 4550 5850 4400 Wire Wire Line 5550 4000 5550 4100 Wire Wire Line 5550 4400 5550 4550 Wire Wire Line 5850 3500 5000 3500 Wire Wire Line 5850 4100 5850 3500 Connection ~ 3300 4400 Wire Wire Line 3300 4400 3300 4500 Wire Wire Line 6350 3500 6750 3500 Connection ~ 6350 3500 Wire Wire Line 3600 3900 3750 3900 Wire Wire Line 3750 4400 3750 3900 Wire Wire Line 3300 4400 3750 4400 Wire Wire Line 6750 3500 6750 3400 Wire Wire Line 3600 3700 3750 3700 Wire Wire Line 3750 3700 3750 3800 Wire Wire Line 3750 3800 3600 3800 Text Notes 4100 5050 0 75 ~ 0 R1 = 10K sets\n100mA CC $Comp L Device:C_Small C2 U 1 1 5FB54FB6 P 6350 4000 F 0 "C2" H 6442 4046 50 0000 L CNN F 1 "4.7uF" H 6442 3955 50 0000 L CNN F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 6350 4000 50 0001 C CNN F 3 "~" H 6350 4000 50 0001 C CNN F 4 "16V" H 6500 3850 50 0000 C CNN "WVDC" F 5 "MuRata GRM21BR71C475KE51L" H 6350 4000 50 0001 C CNN "MPN" F 6 "490-14466-1-ND" H 6350 4000 50 0001 C CNN "DigiKey" 1 6350 4000 1 0 0 -1 $EndComp Text Notes 7100 3450 0 75 ~ 0 POS is positive \nLiPo pad Text Notes 7100 2700 0 75 ~ 0 NEG is negative\nLiPo pad Connection ~ 4050 3500 Wire Wire Line 3600 3500 4050 3500 Wire Wire Line 4050 3500 5000 3500 Wire Notes Line 7050 3500 8050 3500 Wire Notes Line 8050 3500 8050 3200 Wire Notes Line 8050 3200 7050 3200 Wire Notes Line 7050 3200 7050 3500 $Comp L Connector:TestPoint TP1 U 1 1 5FA6481C P 6750 2600 F 0 "TP1" H 6808 2718 50 0000 L CNN F 1 "GND" H 6808 2627 50 0000 L CNN F 2 "TestPoint:TestPoint_THTPad_D2.0mm_Drill1.0mm" H 6950 2600 50 0001 C CNN F 3 "~" H 6950 2600 50 0001 C CNN 1 6750 2600 1 0 0 -1 $EndComp Wire Wire Line 6750 2600 6750 2700 Wire Notes Line 7050 2450 7050 2750 Wire Notes Line 7050 2750 8100 2750 Wire Notes Line 8100 2750 8100 2450 Wire Notes Line 8100 2450 7050 2450 Wire Wire Line 6350 4100 6350 4500 $Comp L power:GND #PWR0101 U 1 1 6154F114 P 6750 2700 F 0 "#PWR0101" H 6750 2450 50 0001 C CNN F 1 "GND" H 6755 2527 50 0000 C CNN F 2 "" H 6750 2700 50 0001 C CNN F 3 "" H 6750 2700 50 0001 C CNN 1 6750 2700 1 0 0 -1 $EndComp Text Notes 8700 2700 0 75 ~ 0 NEG is negative\nterminal pad Wire Wire Line 8350 2600 8350 2700 Wire Notes Line 8650 2450 8650 2750 Wire Notes Line 8650 2750 9700 2750 Wire Notes Line 9700 2750 9700 2450 Wire Notes Line 9700 2450 8650 2450 $Comp L power:GND #PWR0102 U 1 1 6154FCBF P 8350 2700 F 0 "#PWR0102" H 8350 2450 50 0001 C CNN F 1 "GND" H 8355 2527 50 0000 C CNN F 2 "" H 8350 2700 50 0001 C CNN F 3 "" H 8350 2700 50 0001 C CNN 1 8350 2700 1 0 0 -1 $EndComp $Comp L Device:R R2 U 1 1 5FA33B5B P 5550 4250 F 0 "R2" H 5620 4296 50 0000 L CNN F 1 "470" H 5620 4205 50 0000 L CNN F 2 "Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder" V 5480 4250 50 0001 C CNN F 3 "~" H 5550 4250 50 0001 C CNN 1 5550 4250 1 0 0 -1 $EndComp $Comp L Device:LED_ALT D1 U 1 1 5FA329BC P 5850 4250 F 0 "D1" V 5934 4132 50 0000 R CNN F 1 "LED" V 5843 4132 50 0000 R CNN F 2 "LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 5850 4250 50 0001 C CNN F 3 "https://katalog.we-online.de/led/datasheet/156120VS75300.pdf" H 5850 4250 50 0001 C CNN F 4 "CHARGE" V 5752 4132 50 0000 R CNN "Function" F 5 "GREEN" V 5850 4250 50 0001 C CNN "Color" F 6 "Wuerth 156120VS75300" V 5850 4250 50 0001 C CNN "MPN" F 7 "732-5033-1-ND" V 5850 4250 50 0001 C CNN "DigiKey" 1 5850 4250 0 -1 -1 0 $EndComp $Comp L Connector:TestPoint TP3 U 1 1 615553B3 P 8350 2600 F 0 "TP3" H 8408 2718 50 0000 L CNN F 1 "GND" H 8408 2627 50 0000 L CNN F 2 "TestPoint:TestPoint_THTPad_D2.0mm_Drill1.0mm" H 8550 2600 50 0001 C CNN F 3 "~" H 8550 2600 50 0001 C CNN 1 8350 2600 1 0 0 -1 $EndComp $Comp L Connector:TestPoint TP2 U 1 1 61555C90 P 6750 3400 F 0 "TP2" H 6808 3518 50 0000 L CNN F 1 "POS" H 6808 3427 50 0000 L CNN F 2 "TestPoint:TestPoint_THTPad_D2.0mm_Drill1.0mm" H 6950 3400 50 0001 C CNN F 3 "~" H 6950 3400 50 0001 C CNN 1 6750 3400 1 0 0 -1 $EndComp $Comp L Mechanical:MountingHole H1 U 1 1 615566D4 P 7300 4050 F 0 "H1" H 7400 4096 50 0000 L CNN F 1 "MountingHole" H 7400 4005 50 0000 L CNN F 2 "MountingHole:MountingHole_2mm" H 7300 4050 50 0001 C CNN F 3 "~" H 7300 4050 50 0001 C CNN 1 7300 4050 1 0 0 -1 $EndComp $Comp L Mechanical:MountingHole H2 U 1 1 615571E5 P 7300 4300 F 0 "H2" H 7400 4346 50 0000 L CNN F 1 "MountingHole" H 7400 4255 50 0000 L CNN F 2 "MountingHole:MountingHole_2mm" H 7300 4300 50 0001 C CNN F 3 "~" H 7300 4300 50 0001 C CNN 1 7300 4300 1 0 0 -1 $EndComp $EndSCHEMATC