# [Example] Battery Management System ATTINY841 ## Description DIY BMS using ATTINY841-SSU. This 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:** jharwinbarrozo - **Created:** 10/4/2022 - **Last Updated:** 10/4/2022 - **Visibility:** Public ## Key Components ### D1 — [AZ432ANTR-E1](https://www.flux.ai/adrian95/az432antr-e1~0ck.md) - Manufacturer Part Number: AZ432ANTR-E1 - Datasheet URL: https://www.diodes.com/assets/Datasheets/products_inactive_data/AZ432.pdf - Part Type: Integrated Circuit - Manufacturer Name: Diodes Incorporated **Pins:** - P1 - P2 - P3 ### D2 — [SMBJ5.0A](https://www.flux.ai/adrian95/smbj50a~a9w.md) - Manufacturer Part Number: SMBJ5.0A - Manufacturer Name: Littelfuse Inc. - Datasheet URL: https://www.littelfuse.com/~/media/electronics/datasheets/tvs_diodes/littelfuse_tvs_diode_smbj_datasheet.pdf.pdf - Part Type: Diode **Pins:** - A - K ### EXTTEMP1 — [S2B-PH-K-S(LF)(SN)](https://www.flux.ai/adrian95/s2b-ph-k-slfsn~brb.md) - Manufacturer Part Number: S2B-PH-K-S(LF)(SN) - Part Type: Connector - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf - Manufacturer Name: JST Sales America Inc. **Pins:** - P1 - P2 ### F1 — [Fuse_1812_4532Metric](https://www.flux.ai/adrian95/fuse18124532metric~yh8.md) **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 ### J2 — [Pin Socket 02x03 2.54mm Vertical](https://www.flux.ai/adrian95/pin-socket-02x03-254mm-vertical~gq.md) - Part Type: Connector **Pins:** - Pin_1 - Pin_2 - Pin_3 - Pin_4 - Pin_5 - Pin_6 ### LED3 — [LED 0805 (2012 Metric)](https://www.flux.ai/jharwinbarrozo/led-0805-2012-metric~ph.md) - Part Type: LED **Pins:** - A - K ### LED4 — [LED 0805 (2012 Metric)](https://www.flux.ai/jharwinbarrozo/led-0805-2012-metric~ph.md) - Part Type: LED **Pins:** - A - K ### POWER — [S2B-PH-K-S(LF)(SN)](https://www.flux.ai/adrian95/s2b-ph-k-slfsn~brb.md) - Manufacturer Part Number: S2B-PH-K-S(LF)(SN) - Part Type: Connector - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf - Manufacturer Name: JST Sales America Inc. **Pins:** - P1 - P2 ### Q1 — [AO3400A](https://www.flux.ai/adrian95/ao3400a~ug9.md) - Part Type: Transistor - Manufacturer Part Number: AO3400A - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/Alpha%20&%20Omega/AO3400A_ds.pdf - Manufacturer Name: Alpha & Omega Semiconductor Inc. **Pins:** - D - G - S ### REMOTE — [Pin Header 01x02 2.54mm Vertical](https://www.flux.ai/jharwinbarrozo/pin-header-01x02-254mm-vertical~4uy.md) - Part Type: Connector **Pins:** - P1 - P2 ### RX — [S2B-PH-K-S(LF)(SN)](https://www.flux.ai/adrian95/s2b-ph-k-slfsn~brb.md) - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf - Manufacturer Name: JST Sales America Inc. - Part Type: Connector - Manufacturer Part Number: S2B-PH-K-S(LF)(SN) **Pins:** - P1 - P2 ### TX — [S2B-PH-K-S(LF)(SN)](https://www.flux.ai/adrian95/s2b-ph-k-slfsn~brb.md) - Part Type: Connector - Manufacturer Part Number: S2B-PH-K-S(LF)(SN) - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf - Manufacturer Name: JST Sales America Inc. **Pins:** - P1 - P2 ### U1 — [ATTINY841-SSU](https://www.flux.ai/adrian95/attiny841-ssu~xgr.md) - Manufacturer Name: Microchip - Manufacturer Part Number: ATTINY841-SSU - Part Type: Microcontroller - Datasheet URL: https://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-8495-8-bit-AVR-Microcontrollers-ATtiny441-ATtiny841_Datasheet-Summary.pdf **Pins:** - ~RESET~/PB3 - AREF/PA0 - GND - PA1 - PA2 - PA3 - PA4 - PA5 - PA6 - PA7 - PB2 - VCC - XTAL1/PB0 - XTAL2/PB1 ### U2 — [EL3H7(B)(TA)-G](https://www.flux.ai/adrian95/el3h7bta-g~gxd.md) - Manufacturer Name: Everlight Electronics Co Ltd - Datasheet URL: https://everlightamericas.com/index.php?controller=attachment&id_attachment=2584 - Part Type: Transistor - Manufacturer Part Number: EL3H7(B)(TA)-G **Pins:** - P1 - P2 - P3 - P4 ### Y1 — [Crystal SMD 5032 2PIN](https://www.flux.ai/adrian95/crystal-smd-5032-2pin~v9u.md) - Frequency: 8MHz - Part Type: Oscillator **Pins:** - P1 - P2 - P3 - P4 *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/jharwinbarrozo/example-battery-management-system-attiny841~cp8](https://www.flux.ai/jharwinbarrozo/example-battery-management-system-attiny841~cp8).* --- *Generated from [https://www.flux.ai/jharwinbarrozo/example-battery-management-system-attiny841~cp8](https://www.flux.ai/jharwinbarrozo/example-battery-management-system-attiny841~cp8)*