Low Cost Variant¶
The low cost variant is a variant with different and cheap components. It does not fulfill the requirements 100% but still is low power.
Schematics
Top View
Charging Module
Charger IO
RTC cut-off
Regulator
Battery and Protection
MCU
Bill of Main IC Components¶
Reference |
Quantity |
Value |
Datasheet |
Footprint |
LCSC |
|---|---|---|---|---|---|
U1 |
1 |
FS312F-G |
https://www.ic-fortune.com/upload/Download/FS312F-G-DS-12_EN.pdf |
Package_TO_SOT_SMD:SOT-23-6_Handsoldering |
C82736 |
U10 |
1 |
FP6291LR |
www.feeling-tech.com.tw/km-master/ezcatfiles/cust/img/img/24/fp6291v064.pdf |
Package_TO_SOT_SMD:SOT-23-6_Handsoldering |
C18701 |
U11 U12 |
2 |
ME6210A33P |
https://datasheet.lcsc.com/szlcsc/1810201611_MICRONE-Nanjing-Micro-One-Elec-ME6210A33PG_C85233.pdf |
Package_TO_SOT_SMD:SOT-89-3_Handsoldering |
C85233 |
U13 |
1 |
ESP32-WROOM32 |
https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32_datasheet_en.pdf |
RF_Module:ESP32-WROOM-32 |
C82899 |
U2 |
1 |
FS8205A |
https://www.ic-fortune.com/upload/Download/FS8205A-DS-12_EN.pdf |
Package_SO:TSSOP-8_4.4x3mm_P0.65mm |
C16052 |
U3 |
1 |
LC709203FQH |
Package_DFN_QFN:WDFN-8-1EP_4x3mm_P0.65mm_EP2.4x1.8mm |
C152311 |
|
U4 |
1 |
TP4056 |
https://dlnmh9ip6v2uc.cloudfront.net/datasheets/Prototyping/TP4056.pdf |
Package_SO:SOP-8_3.9x4.9mm_P1.27mm |
C16581 |
U5 |
1 |
CH340G |
Package_SO:SOP-16_4.55x10.3mm_P1.27mm |
C14267 |
|
U6 |
1 |
AMS1117-3.3 |
Package_TO_SOT_SMD:SOT-223-3_TabPin2 |
C6186 |
|
U7 |
1 |
PCF8563T |
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm |
C7440 |
|
U8 |
1 |
XC6206P332MR |
Package_TO_SOT_SMD:SOT-23_Handsoldering |
C5446 |
|
U9 |
1 |
TCA6408A |
Package_SO:TSSOP-16_4.4x5mm_P0.65mm |
C206177 |
|
Y1 |
1 |
12MHZ |
https://datasheet.lcsc.com/szlcsc/Yangxing-Tech-X322512MSB4SI_C9002.pdf |
Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm_HandSoldering |
C9002 |
Y2 |
1 |
32.768KHz |
1901081604_Seiko-Epson-Q13FC1350000400_C32346.pdf |
Crystal:Crystal_SMD_3215-2Pin_3.2x1.5mm |
C32346 |
Full Bill of Materials¶
Reference |
Quantity |
Value |
Datasheet |
Footprint |
LCSC |
|---|---|---|---|---|---|
C1 C2 C8 C9 C14 C15 C19 C20 |
8 |
0.1µF |
~ |
Capacitor_SMD:C_0603_1608Metric_Pad1.05x0.95mm_HandSolder |
C14858 |
C3 C5 C10 C11 C12 C13 C21 |
7 |
1µF |
~ |
Capacitor_SMD:C_0603_1608Metric_Pad1.05x0.95mm_HandSolder |
C15849 |
C4 C16 C17 C18 |
4 |
10µF |
~ |
Capacitor_SMD:C_0603_1608Metric_Pad1.05x0.95mm_HandSolder |
C19702 |
C6 C7 |
2 |
22pF |
~ |
Capacitor_SMD:C_0603_1608Metric_Pad1.05x0.95mm_HandSolder |
C1653 |
D1 D2 |
2 |
LED |
~ |
LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder |
C2286 |
D3 |
1 |
SM4007 |
http://cdn-reichelt.de/documents/datenblatt/A400/SMD1N400%23DIO.pdf |
Diode_SMD:D_MELF |
C64898 |
D4 |
1 |
D_Schottky |
https://datasheet.lcsc.com/szlcsc/1903051003_MDD-Jiangsu-Yutai-Elec-SS34_C8678.pdf |
Diode_SMD:D_SMA_Handsoldering |
C8678 |
J1 |
1 |
Battery connector |
https://datasheet.lcsc.com/szlcsc/1811051822_JST-Sales-America-S2B-XH-A-LF-SN_C157931.pdf |
Connector_JST:JST_EH_S2B-EH_1x02_P2.50mm_Horizontal |
C157931 |
J2 |
1 |
Thermistor |
https://datasheet.lcsc.com/szlcsc/TDK-NTCG163JF103FT1_C76589.pdf |
Resistor_SMD:R_0603_1608Metric_Pad1.05x0.95mm_HandSolder |
C76589 |
J3 |
1 |
USB_C_Receptacle_USB2.0 |
https://www.usb.org/sites/default/files/documents/usb_type-c.zip |
||
J4 |
1 |
Solar in |
https://datasheet.lcsc.com/szlcsc/1811051822_JST-Sales-America-S2B-XH-A-LF-SN_C157931.pdf |
Connector_JST:JST_EH_S2B-EH_1x02_P2.50mm_Horizontal |
C157931 |
J5 J6 |
2 |
main pin header |
~ |
Connector_PinHeader_2.54mm:PinHeader_1x16_P2.54mm_Vertical |
|
J7 |
1 |
IO expander pins |
~ |
Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical |
|
JP1 |
1 |
CHRG_Jumper |
~ |
Jumper:SolderJumper-3_P1.3mm_Open_Pad1.0x1.5mm |
|
JP2 |
1 |
INT override |
~ |
Jumper:SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm |
|
JP3 |
1 |
MCULDO_override |
~ |
Jumper:SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm |
|
L1 |
1 |
3.3u |
~ |
Inductor_SMD:L_0805_2012Metric_Pad1.15x1.40mm_HandSolder |
C51725 |
Q1 Q2 Q7 |
3 |
2N7002 |
Package_TO_SOT_SMD:SOT-23 |
C8545 |
|
Q3 Q4 |
2 |
S8050 |
Package_TO_SOT_SMD:SOT-23_Handsoldering |
C111272 |
|
Q5 Q6 |
2 |
AO3401A |
Package_TO_SOT_SMD:SOT-23_Handsoldering |
C347476 |
|
R1 R10 R18 |
3 |
1k |
~ |
Resistor_SMD:R_0603_1608Metric_Pad1.05x0.95mm_HandSolder |
C21190 |
R15 R17 |
2 |
22k |
~ |
Resistor_SMD:R_0603_1608Metric_Pad1.05x0.95mm_HandSolder |
C17560 |
R19 R20 |
2 |
5.1k |
~ |
Resistor_SMD:R_0603_1608Metric_Pad1.05x0.95mm_HandSolder |
C23186 |
R2 |
1 |
100 |
~ |
Resistor_SMD:R_0603_1608Metric_Pad1.05x0.95mm_HandSolder |
C22775 |
R3 R8 R9 R11 R12 |
5 |
10k |
~ |
Resistor_SMD:R_0603_1608Metric_Pad1.05x0.95mm_HandSolder |
C25804 |
R4 R5 |
2 |
1.8k |
~ |
Resistor_SMD:R_0603_1608Metric_Pad1.05x0.95mm_HandSolder |
C4177 |
R6 R13 R14 R16 |
4 |
180k |
~ |
Resistor_SMD:R_0603_1608Metric_Pad1.05x0.95mm_HandSolder |
C22827 |
R7 |
1 |
1M |
~ |
Resistor_SMD:R_0603_1608Metric_Pad1.05x0.95mm_HandSolder |
C22935 |
U1 |
1 |
FS312F-G |
https://www.ic-fortune.com/upload/Download/FS312F-G-DS-12_EN.pdf |
Package_TO_SOT_SMD:SOT-23-6_Handsoldering |
C82736 |
U10 |
1 |
FP6291LR |
www.feeling-tech.com.tw/km-master/ezcatfiles/cust/img/img/24/fp6291v064.pdf |
Package_TO_SOT_SMD:SOT-23-6_Handsoldering |
C18701 |
U11 U12 |
2 |
ME6210A33P |
https://datasheet.lcsc.com/szlcsc/1810201611_MICRONE-Nanjing-Micro-One-Elec-ME6210A33PG_C85233.pdf |
Package_TO_SOT_SMD:SOT-89-3_Handsoldering |
C85233 |
U13 |
1 |
ESP32-WROOM32 |
https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32_datasheet_en.pdf |
RF_Module:ESP32-WROOM-32 |
C82899 |
U2 |
1 |
FS8205A |
https://www.ic-fortune.com/upload/Download/FS8205A-DS-12_EN.pdf |
Package_SO:TSSOP-8_4.4x3mm_P0.65mm |
C16052 |
U3 |
1 |
LC709203FQH |
Package_DFN_QFN:WDFN-8-1EP_4x3mm_P0.65mm_EP2.4x1.8mm |
C152311 |
|
U4 |
1 |
TP4056 |
https://dlnmh9ip6v2uc.cloudfront.net/datasheets/Prototyping/TP4056.pdf |
Package_SO:SOP-8_3.9x4.9mm_P1.27mm |
C16581 |
U5 |
1 |
CH340G |
Package_SO:SOP-16_4.55x10.3mm_P1.27mm |
C14267 |
|
U6 |
1 |
AMS1117-3.3 |
Package_TO_SOT_SMD:SOT-223-3_TabPin2 |
C6186 |
|
U7 |
1 |
PCF8563T |
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm |
C7440 |
|
U8 |
1 |
XC6206P332MR |
Package_TO_SOT_SMD:SOT-23_Handsoldering |
C5446 |
|
U9 |
1 |
TCA6408A |
Package_SO:TSSOP-16_4.4x5mm_P0.65mm |
C206177 |
|
Y1 |
1 |
12MHZ |
https://datasheet.lcsc.com/szlcsc/Yangxing-Tech-X322512MSB4SI_C9002.pdf |
Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm_HandSoldering |
C9002 |
Y2 |
1 |
32.768KHz |
1901081604_Seiko-Epson-Q13FC1350000400_C32346.pdf |
Crystal:Crystal_SMD_3215-2Pin_3.2x1.5mm |
C32346 |