# Raspberry Pi 5 3S UPS

## Description

Visual carrier\-board schematic for a 3S pouch\-cell pack, 3S BMS and USB\-C charger, with separate 5 V rails for a Raspberry Pi 5 and two MG90S servos driven by a PCA9685\.

## Project Details

- **Owner:** ashemarya
- **Created:** 8/14/2026
- **Last Updated:** 8/24/2026
- **Visibility:** Public

## Key Components

### F1 — [24F 5A250V](https://flux.ai/lcsc/24f-5a250v~m73a.md)

- Part Type: Fuses
- Functional Group: Main Protection and Switching
- Datasheet URL: https://www\.lcsc\.com/datasheet/C2905500\.pdf?spm=wm\.sxq\.inf\.ggs&utm\_source=octopart&lcsc\_vid=FldaXlQARVYLBl1SFlANU1QEEQdXAQdeR1ALXlMFQFkxVlNeR1JcUVBfT1RdUTsOAxUeFF5JWA4NEwsWFhMaSQcJGk4%3D
- Current Rating: 7\.5A
- JLCPCB Part Class: Extended Part
- LCSC Part Number: C2905500
- Manufacturer Name: xcfuse\(旭程\)
- Role Details: 7\.5A main fuse after BMS protected output
- Manufacturer Part Number: 24F 5A250V
- Package or Case Code: FUSE\-SMD\_L6\.1\-W2\.6
- Role: Protection

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### F2 — [24F 5A250V](https://flux.ai/lcsc/24f-5a250v~m73a.md)

- Part Type: Fuses
- Functional Group: Pi 5 Buck Branch
- Current Rating: 5A
- Datasheet URL: https://www\.lcsc\.com/datasheet/C2905500\.pdf?spm=wm\.sxq\.inf\.ggs&utm\_source=octopart&lcsc\_vid=FldaXlQARVYLBl1SFlANU1QEEQdXAQdeR1ALXlMFQFkxVlNeR1JcUVBfT1RdUTsOAxUeFF5JWA4NEwsWFhMaSQcJGk4%3D
- Role Details: 5A fuse for PI\_5V branch
- Role: Protection
- JLCPCB Part Class: Extended Part
- LCSC Part Number: C2905500
- Manufacturer Name: xcfuse\(旭程\)
- Manufacturer Part Number: 24F 5A250V
- Package or Case Code: FUSE\-SMD\_L6\.1\-W2\.6

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### F3 — [24F 5A250V](https://flux.ai/lcsc/24f-5a250v~m73a.md)

- Part Type: Fuses
- Functional Group: Servo Buck Branch
- Role Details: 5A fuse for SERVO\_5V branch
- Datasheet URL: https://www\.lcsc\.com/datasheet/C2905500\.pdf?spm=wm\.sxq\.inf\.ggs&utm\_source=octopart&lcsc\_vid=FldaXlQARVYLBl1SFlANU1QEEQdXAQdeR1ALXlMFQFkxVlNeR1JcUVBfT1RdUTsOAxUeFF5JWA4NEwsWFhMaSQcJGk4%3D
- Current Rating: 5A
- JLCPCB Part Class: Extended Part
- LCSC Part Number: C2905500
- Manufacturer Name: xcfuse\(旭程\)
- Manufacturer Part Number: 24F 5A250V
- Package or Case Code: FUSE\-SMD\_L6\.1\-W2\.6
- Role: Protection

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### J1 — [691311700102](https://flux.ai/adrian95/691311700102~52f.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Role Details: CELL1 3\.7V 2000mAh: pin 1 negative, pin 2 positive
- Manufacturer Name: Würth Elektronik
- Manufacturer Part Number: 691311700102
- Role: Battery Cell
- Functional Group: 3S Cell Stack
- Datasheet URL: https://www\.we\-online\.com/katalog/datasheet/6913117001xx\.pdf
- Part Type: Connector

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### J10 — [691311700102](https://flux.ai/adrian95/691311700102~52f.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Name: Würth Elektronik
- Functional Group: Servo Buck Branch
- Role: Mini560 Pro Input
- Role Details: Mini560 Pro fixed 5V nominal 5A module input IN\+ / IN\-
- Manufacturer Part Number: 691311700102
- Datasheet URL: https://www\.we\-online\.com/katalog/datasheet/6913117001xx\.pdf
- Part Type: Connector

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### J11 — [691311700102](https://flux.ai/adrian95/691311700102~52f.md)

- Role Details: 5V nominal servo rail; simultaneous servo stall can exceed module capability
- Functional Group: Servo Buck Branch
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Name: Würth Elektronik
- Manufacturer Part Number: 691311700102
- Datasheet URL: https://www\.we\-online\.com/katalog/datasheet/6913117001xx\.pdf
- Role: Mini560 Pro Output
- Part Type: Connector

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### J12 — [691311700102](https://flux.ai/adrian95/691311700102~52f.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Name: Würth Elektronik
- Functional Group: PCA9685 Servo Power
- Manufacturer Part Number: 691311700102
- Role: PCA9685 Servo Power
- Role Details: PCA9685 V\+ / GND from SERVO\_5V rail
- Datasheet URL: https://www\.we\-online\.com/katalog/datasheet/6913117001xx\.pdf
- Part Type: Connector

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### J13 — [Pin Header 01x04 2\.54mm Vertical i2c](https://flux.ai/hasanbasri93/pin-header-01x04-2p54mm-vertical-i2c~37.md)

- Functional Group: Raspberry Pi Logic Interface
- Role Details: Pins by nets: 3V3, GND, SDA, SCL
- Part Type: Connector
- License: https://creativecommons\.org/licenses/by/4\.0/
- Role: Raspberry Pi Logic

**Pins:**
- 5V [pin 1]
- GND [pin 2]
- SCL [pin 4]
- SDA [pin 3]

### J14 — [Pin Header 01x04 2\.54mm Vertical i2c](https://flux.ai/hasanbasri93/pin-header-01x04-2p54mm-vertical-i2c~37.md)

- Part Type: Connector
- License: https://creativecommons\.org/licenses/by/4\.0/
- Role Details: Logic connector: 3V3, GND, SDA, SCL; common protected/load ground
- Role: PCA9685 Logic
- Functional Group: PCA9685 Logic Interface

**Pins:**
- 5V [pin 1]
- GND [pin 2]
- SCL [pin 4]
- SDA [pin 3]

### J15 — [Pin Header 01x03 2\.54mm Vertical for Servo Motor](https://flux.ai/project-x/pin-header-01x03-2p54mm-vertical-for-servo-motor~jl.md)

- Role: PCA9685 Servo Output
- Part Type: Connector
- Role Details: Representative PCA9685 output block for 2x MG90S: PWM / SERVO\_5V / GND
- Functional Group: PCA9685 Servo Outputs
- License: https://creativecommons\.org/licenses/by/4\.0/

**Pins:**
- 5v [pin 2]
- Data [pin 3]
- Gnd [pin 1]

### J16 — [Pin Header 01x03 2\.54mm Vertical for Servo Motor](https://flux.ai/project-x/pin-header-01x03-2p54mm-vertical-for-servo-motor~jl.md)

- Role: Servo Load Bank
- Functional Group: Servo Loads
- Part Type: Connector
- Role Details: 2x MG90S servo load bank \(representative block\)\. Reduced from five servos; simultaneous stall current still requires testing\.
- License: https://creativecommons\.org/licenses/by/4\.0/

**Pins:**
- 5v [pin 2]
- Data [pin 3]
- Gnd [pin 1]

### J2 — [691311700102](https://flux.ai/adrian95/691311700102~52f.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Role Details: CELL2 3\.7V 2000mAh: series middle cell
- Manufacturer Name: Würth Elektronik
- Manufacturer Part Number: 691311700102
- Role: Battery Cell
- Datasheet URL: https://www\.we\-online\.com/katalog/datasheet/6913117001xx\.pdf
- Functional Group: 3S Cell Stack
- Part Type: Connector

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### J3 — [691311700102](https://flux.ai/adrian95/691311700102~52f.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Name: Würth Elektronik
- Role Details: CELL3 3\.7V 2000mAh: top cell; pack 11\.1V nominal, 12\.6V full
- Manufacturer Part Number: 691311700102
- Functional Group: 3S Cell Stack
- Role: Battery Cell
- Datasheet URL: https://www\.we\-online\.com/katalog/datasheet/6913117001xx\.pdf
- Part Type: Connector

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### J4 — [691321300004](https://flux.ai/adrian95/691321300004~y3o.md)

- Role: 3S BMS Cell Taps
- Manufacturer Part Number: 691321300004
- Part Type: Connector
- License: https://creativecommons\.org/licenses/by/4\.0/
- Functional Group: 3S BMS Module
- Manufacturer Name: Würth Elektronik
- Role Details: Pins labeled by nets: B\-, B1 \(4\.2V\), B2 \(8\.4V\), B\+ \(12\.6V\)\. Keep distinct from protected load ground\.
- Datasheet URL: https://www\.we\-online\.com/components/products/datasheet/6913213000xx\.pdf

**Pins:**
- Pin\_1 [pin 1]
- Pin\_2 [pin 2]
- Pin\_3 [pin 3]
- Pin\_4 [pin 4]

### J5 — [691311700102](https://flux.ai/adrian95/691311700102~52f.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Name: Würth Elektronik
- Role Details: BMS protected P\- / P\+ output\-charge port; exact module pad names/topology must be verified
- Functional Group: 3S BMS Module
- Manufacturer Part Number: 691311700102
- Datasheet URL: https://www\.we\-online\.com/katalog/datasheet/6913117001xx\.pdf
- Role: Protected Pack Port
- Part Type: Connector

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### J6 — [691311700102](https://flux.ai/adrian95/691311700102~52f.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Name: Würth Elektronik
- Role Details: VERIFY CHARGER/BMS PORT PINOUT BEFORE ASSEMBLY — DO NOT CHARGE WHILE OPERATING UNTIL VERIFIED
- Manufacturer Part Number: 691311700102
- Role: USB\-C 3S Charger Module
- Datasheet URL: https://www\.we\-online\.com/katalog/datasheet/6913117001xx\.pdf
- Part Type: Connector
- Functional Group: USB\-C 3S Charger Module

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### J7 — [691311700102](https://flux.ai/adrian95/691311700102~52f.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Name: Würth Elektronik
- Role Details: XL4015 adjustable 5A module input IN\+ / IN\-
- Manufacturer Part Number: 691311700102
- Datasheet URL: https://www\.we\-online\.com/katalog/datasheet/6913117001xx\.pdf
- Part Type: Connector
- Functional Group: Pi 5 Buck Branch
- Role: XL4015 Input

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### J8 — [691311700102](https://flux.ai/adrian95/691311700102~52f.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Functional Group: Pi 5 Buck Branch
- Manufacturer Name: Würth Elektronik
- Role: XL4015 Output
- Role Details: Set to 5\.1V\. Verify real sustained current and thermal performance under Raspberry Pi 5 load\.
- Manufacturer Part Number: 691311700102
- Datasheet URL: https://www\.we\-online\.com/katalog/datasheet/6913117001xx\.pdf
- Part Type: Connector

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### J9 — [691311700102](https://flux.ai/adrian95/691311700102~52f.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Name: Würth Elektronik
- Functional Group: Pi 5 Buck Branch
- Manufacturer Part Number: 691311700102
- Role: Pi Power Output
- Role Details: PI 5V / GND \(USB\-C pigtail\)
- Datasheet URL: https://www\.we\-online\.com/katalog/datasheet/6913117001xx\.pdf
- Part Type: Connector

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### S1 — [SW\_SPDT](https://flux.ai/adrian95/swspdt~q2k.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Role: Switching
- Role Details: Master disconnect on protected positive rail; unused throw intentionally NC
- Symbol Style: parametric\-v1
- Functional Group: Main Protection and Switching
- Part Type: Switch

**Pins:**
- A [pin 1]
- B [pin 2]
- C [pin 3]

*The full schematic, PCB layout, bill of materials, and interactive design are available at [https://flux\.ai/ashemarya/raspberry\-pi\-5\-3s\-ups\~s6](https://flux.ai/ashemarya/raspberry-pi-5-3s-ups~s6).*

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*Generated from [https://flux\.ai/ashemarya/raspberry\-pi\-5\-3s\-ups\~s6](https://flux.ai/ashemarya/raspberry-pi-5-3s-ups~s6)*