# BMS ## Description DIY BMS using ATTINY841-SSU this hardware has a higher balance current, fuse and TVS diode to help with voltage spikes. Most importantly, an external crystal to the micro controller (attiny841) which means the device is more reliable in low voltage situations ## Project Details - **Owner:** adrian95 - **Created:** 9/21/2022 - **Last Updated:** 7/22/2024 - **Visibility:** Public - **Stars:** 14 - **Forks:** 17 - **Copies:** 21 ## Key Components ### D1 — [AZ432ANTR-E1](https://www.flux.ai/adrian95/az432antr-e1~0ck.md) - Part Type: Integrated Circuit - Manufacturer Part Number: AZ432ANTR-E1 - Manufacturer Name: Diodes Incorporated - Datasheet URL: https://www.diodes.com/assets/Datasheets/products_inactive_data/AZ432.pdf **Pins:** - P1 - P2 - P3 ### D2 — [SMBJ5.0A](https://www.flux.ai/adrian95/smbj50a~a9w.md) - Datasheet URL: https://www.littelfuse.com/~/media/electronics/datasheets/tvs_diodes/littelfuse_tvs_diode_smbj_datasheet.pdf.pdf - Manufacturer Name: Littelfuse Inc. - Part Type: Diode - Manufacturer Part Number: SMBJ5.0A **Pins:** - A - K ### EXTTEMP1 — [S2B-PH-K-S(LF)(SN)](https://www.flux.ai/adrian95/s2b-ph-k-slfsn~brb.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: S2B-PH-K-S(LF)(SN) - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf - Part Type: Connector - Manufacturer Name: JST Sales America Inc. **Pins:** - P1 [pin 1] - P2 [pin 2] ### F1 — [Fuse_1812_4532Metric](https://www.flux.ai/adrian95/fuse18124532metric~yh8.md) - Current: 1.5A - Manufacturer Name: Shenzhen Jinkaisheng Elec - Datasheet URL: https://datasheet.lcsc.com/lcsc/1912111437_Shenzhen-Jinkaisheng-Elec-JK-nSMD150SF_C369553.pdf - Manufacturer Part Number: JK-nSMD150SF - Voltage: 8V **Pins:** - P1 - P2 ### H1 — [MountingHole 7.4mm Pad 3.2mm drill](https://www.flux.ai/adrian95/mountinghole-74mm-pad-32mm-drill~7o1.md) - Manufacturer Part Number: MountingHole_Pad **Pins:** - 1 ### H2 — [MountingHole 7.4mm Pad 3.2mm drill](https://www.flux.ai/adrian95/mountinghole-74mm-pad-32mm-drill~7o1.md) - Manufacturer Part Number: MountingHole_Pad **Pins:** - 1 ### H3 — [Mounting Hole 3.2mm DIN965 Pad](https://www.flux.ai/adrian95/mounting-hole-32mm-din965-pad~aio.md) - Part Type: Connector **Pins:** - Pin_1 [pin 1] ### J2 — [Pin Socket 02x03 2.54mm Vertical](https://www.flux.ai/adrian95/pin-socket-02x03-254mm-vertical~gq.md) - Manufacturer Part Number: Nextron(Nextronics Engineering) - Manufacturer Name: Z-100063200100100 - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://datasheet.lcsc.com/lcsc/2202082130_Nextron-Nextronics-Engineering-Z-100063200100100_C190817.pdf **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] - Pin_5 [pin 5] - Pin_6 [pin 6] ### POWER — [S2B-PH-K-S(LF)(SN)](https://www.flux.ai/adrian95/s2b-ph-k-slfsn~brb.md) - Part Type: Connector - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf - Manufacturer Name: JST Sales America Inc. - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: S2B-PH-K-S(LF)(SN) **Pins:** - P1 [pin 1] - P2 [pin 2] ### Q1 — [AO3400A](https://www.flux.ai/adrian95/ao3400a~ug9.md) - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/Alpha%20&%20Omega/AO3400A_ds.pdf - Manufacturer Part Number: AO3400A - Part Type: Transistor - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Alpha & Omega Semiconductor Inc. **Pins:** - D [pin 3] - G [pin 1] - S [pin 2] ### REMOTE — [Pin Header 01x02 2.54mm Vertical](https://www.flux.ai/jharwinbarrozo/pin-header-01x02-254mm-vertical~4uy.md) - Part Type: Connector - Manufacturer Name: JST Sales America - Manufacturer Part Number: RE-H022TD-1190(LF)(SN) - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://datasheet.lcsc.com/lcsc/1811151527_JST-Sales-America-RE-H022TD-1190-LF-SN_C160332.pdf **Pins:** - P1 [pin 1] - P2 [pin 2] ### RX — [S2B-PH-K-S(LF)(SN)](https://www.flux.ai/adrian95/s2b-ph-k-slfsn~brb.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: S2B-PH-K-S(LF)(SN) - Manufacturer Name: JST Sales America Inc. - Part Type: Connector - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf **Pins:** - P1 [pin 1] - P2 [pin 2] ### TX — [S2B-PH-K-S(LF)(SN)](https://www.flux.ai/adrian95/s2b-ph-k-slfsn~brb.md) - Part Type: Connector - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf - Manufacturer Name: JST Sales America Inc. - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: S2B-PH-K-S(LF)(SN) **Pins:** - P1 [pin 1] - P2 [pin 2] ### U1 — [ATTINY841-SSU](https://www.flux.ai/adrian95/attiny841-ssu~xgr.md) - Manufacturer Name: Microchip - Manufacturer Part Number: ATTINY841-SSU - Datasheet URL: https://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-8495-8-bit-AVR-Microcontrollers-ATtiny441-ATtiny841_Datasheet-Summary.pdf - Part Type: Microcontroller - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - ~RESET~/PB3 [pin 4] - AREF/PA0 [pin 13] - GND [pin 14] - PA1 [pin 12] - PA2 [pin 11] - PA3 [pin 10] - PA4 [pin 9] - PA5 [pin 8] - PA6 [pin 7] - PA7 [pin 6] - PB2 [pin 5] - VCC [pin 1] - XTAL1/PB0 [pin 2] - XTAL2/PB1 [pin 3] ### U2 — [EL3H7(B)(TA)-G](https://www.flux.ai/adrian95/el3h7bta-g~gxd.md) - Part Type: Transistor - Datasheet URL: https://everlightamericas.com/index.php?controller=attachment&id_attachment=2584 - Manufacturer Part Number: EL3H7(B)(TA)-G - Manufacturer Name: Everlight Electronics Co Ltd - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - P1 [pin 1] - P2 [pin 2] - P3 [pin 3] - P4 [pin 4] ### Y1 — [Crystal SMD 5032 2PIN](https://www.flux.ai/adrian95/crystal-smd-5032-2pin~v9u.md) - Frequency: 8MHz - Manufacturer Part Number: CSTNE8M00G55A000R0 - Manufacturer Name: Murata Electronics - Part Type: Oscillator - Datasheet URL: https://datasheet.lcsc.com/lcsc/2008251032_Murata-Electronics-CSTNE8M00G55A000R0_C341523.pdf **Pins:** - P1 - P2 - P3 - P4 *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/adrian95/bms~q8s](https://www.flux.ai/adrian95/bms~q8s).* --- *Generated from [https://www.flux.ai/adrian95/bms~q8s](https://www.flux.ai/adrian95/bms~q8s)*