# Flight Computer 3

## Description

Flight computer electronics; current approved scope captures only the Stage 1 USB\-C, battery source selection, 3\.3 V regulation, sensing, and ARM\_BUS pass\-through block\.

## Project Details

- **Owner:** jayanthan
- **Created:** 10/6/2026
- **Last Updated:** 10/7/2026
- **Visibility:** Public
- **Copies:** 1

## Key Components

### D1 — [SS14](https://flux.ai/jecstronic/ss14~ri4.md)

- Role Details: USB VBUS to VSYS Schottky path; A=VBUS C=VSYS
- Manufacturer Name: Slkor\(SLKORMICRO Elec\.\)
- Datasheet URL: https://datasheet\.lcsc\.com/lcsc/1912111437\_Slkor\-SLKORMICRO\-Elec\-\-SS14\_C444721\.pdf
- Part Type: Diode
- Functional Group: POWER Q1 Source Selection
- Role: Rectification
- Manufacturer Part Number: SS14
- License: https://creativecommons\.org/licenses/by/4\.0/

**Pins:**
- Anode [pin A]
- Cathode [pin C]

### D2 — [150060VS75000](https://flux.ai/silicon-yard/150060vs75000.md)

- Role Details: Green LED controlled by LED1\_CTRL
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/user\-uploaded/4785c458b2c53f281c6149dd11617420e108d5d9a5c642541811a66a30135e21\.pdf
- Role: Status Indicator
- Package or Case Code: R0603
- Part Type: LED
- Manufacturer Part Number: 150060VS75000
- Manufacturer Name: Würth Elektronik
- Functional Group: INDICATOR D2 Status LED

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

### D3 — [150060RS75000](https://flux.ai/silicon-yard/150060rs75000.md)

- Manufacturer Part Number: 150060RS75000
- Mount: Surface Mount
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Name: Würth Elektronik
- Role: Status Indicator
- Part Type: LED
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/user\-uploaded/4847084e65fbd02a8483cd4e10c5e1b8dd83e3fc6037cc7800c2f54dcc2a488b\.pdf
- Role Details: Red LED controlled by LED2\_CTRL
- Functional Group: INDICATOR D3 Status LED

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

### J1 — [TYPE\-C\-31\-M\-12](https://flux.ai/vasy_skral/type-c-31-m-12~75f.md)

- Manufacturer Name: Korean Hroparts Elec
- Role Details: USB\-C power and USB 2\.0 interface
- Functional Group: INTERFACE J1 USB\-C
- License: https://creativecommons\.org/licenses/by/4\.0/
- Datasheet URL: https://en\.krhro\.com/npublic/opdfjs/web/viewer\.html?file=https%3A%2F%2Fomo\-oss\-file\.thefastfile\.com%2Fportal\-saas%2Fnew2023011311465142457%2Fcms%2Ffile%2F95f41c83\-14fa\-41cb\-9f86\-8d6a717317e5\.pdf
- Manufacturer Part Number: TYPE\-C\-31\-M\-12
- Symbol Style: Parametric
- Part Type: Connector
- Role: USB Connector

**Pins:**
- CC1 [pin A5]
- CC2 [pin B5]
- DN1 [pin A7]
- DN2 [pin B7]
- DP1 [pin A6]
- DP2 [pin B6]
- GND [pin B1A12]
- GND [pin A1B12]
- SBU1 [pin A8]
- SBU2 [pin B8]
- SHIELD [pin S3]
- SHIELD [pin S1]
- SHIELD [pin S4]
- SHIELD [pin S2]
- VBUS [pin B4A9]
- VBUS [pin A4B9]

### J2 — [B2B\-PH\-K\-S](https://flux.ai/adrian95/b2b-ph-k-s~fx.md)

- Functional Group: POWER J2 Battery Input
- License: https://creativecommons\.org/licenses/by/4\.0/
- Role Details: 1S battery input; polarity follows source pin 1 positive
- Part Type: Connector
- Datasheet URL: https://www\.jst\-mfg\.com/product/pdf/eng/ePH\.pdf
- Symbol Style: parametric\-v1
- Package or Case Code: JST\_B2B\-PH\-K\-S
- Role: Battery Connector
- Manufacturer Part Number: B2B\-PH\-K\-S
- Manufacturer Name: JST

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

### J3 — [Pin Header 01x06 2\.54mm Vertical](https://flux.ai/vasy_skral/pin-header-01x06-254mm-vertical~jyw.md)

- Functional Group: DEBUG J3 SWD Header
- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: Connector
- Role Details: Six\-pin SWD programming and trace header
- Role: Debug Header

**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]

### J4 — [Pin Header 01x04 2\.54mm Vertical](https://flux.ai/adrian95/pin-header-01x04-254mm-vertical~l97.md)

- Functional Group: INTERFACE J4 UART Header
- Role: Expansion Header
- Part Type: Connector
- License: https://creativecommons\.org/licenses/by/4\.0/
- Role Details: Four\-pin UART header

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

### J5 — [Pin Header 01x04 2\.54mm Vertical](https://flux.ai/adrian95/pin-header-01x04-254mm-vertical~l97.md)

- Part Type: Connector
- Functional Group: INTERFACE J5 I2C Header
- Role: Expansion Header
- License: https://creativecommons\.org/licenses/by/4\.0/
- Role Details: Four\-pin I2C header

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

### J6 — [Pin Header 01x02 2\.54mm Vertical](https://flux.ai/jharwinbarrozo/generic-pin-header-01x02-2p54mm-vertical~4uy.md)

- Functional Group: OUTPUT Q3 Output 1 Driver
- Role Details: ARM\_BUS and switched OUT1\_N
- Role: Output Header
- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: Connector

**Pins:**
- P1 [pin 1]
- P2 [pin 2]

### J7 — [Pin Header 01x02 2\.54mm Vertical](https://flux.ai/jharwinbarrozo/generic-pin-header-01x02-2p54mm-vertical~4uy.md)

- Functional Group: OUTPUT Q4 Output 2 Driver
- License: https://creativecommons\.org/licenses/by/4\.0/
- Role: Output Header
- Role Details: ARM\_BUS and switched OUT2\_N
- Part Type: Connector

**Pins:**
- P1 [pin 1]
- P2 [pin 2]

### J8 — [Pin Header 01x02 2\.54mm Vertical](https://flux.ai/jharwinbarrozo/generic-pin-header-01x02-2p54mm-vertical~4uy.md)

- Role: Buzzer Header
- License: https://creativecommons\.org/licenses/by/4\.0/
- Functional Group: OUTPUT Q2 Buzzer Driver
- Role Details: 3V3 and switched BUZ\_N
- Part Type: Connector

**Pins:**
- P1 [pin 1]
- P2 [pin 2]

### JP1 — [Pin Header 02x01 2\.54mm Vertical](https://flux.ai/adrian95/pin-header-02x01-254mm-vertical~evn.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Role Details: VSYS to ARM\_BUS removable link
- Part Type: Connector
- Functional Group: POWER JP1 ARM Pass\-Through
- Role: Pass\-Through Header

**Pins:**
- Pin\_1 [pin 1]
- Pin\_2 [pin 2]

### Q1 — [AO3401A](https://flux.ai/jecstronic/ao3401a~9r5.md)

- Role Details: P\-channel battery path; G=VBUS S=VSYS D=VBAT
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Part Number: AO3401A
- Part Type: Transistor
- Datasheet URL: https://www\.lcsc\.com/datasheet/lcsc\_datasheet\_2007171935\_HUASHUO\-AO3401A\_C700954\.pdf
- Role: Switching
- Functional Group: POWER Q1 Source Selection
- Manufacturer Name:  HUASHUO

**Pins:**
- D [pin 3]
- G [pin 1]
- S [pin 2]

### Q2 — [AO3400A](https://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
- Role Details: Buzzer low\-side driver
- Manufacturer Name: Alpha & Omega Semiconductor Inc\.
- Role: Switching
- Functional Group: OUTPUT Q2 Buzzer Driver
- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: Transistor

**Pins:**
- D [pin 3]
- G [pin 1]
- S [pin 2]

### Q3 — [AO3400A](https://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
- Functional Group: OUTPUT Q3 Output 1 Driver
- Manufacturer Name: Alpha & Omega Semiconductor Inc\.
- Role: Switching
- Role Details: ARM\_BUS output 1 low\-side driver
- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: Transistor

**Pins:**
- D [pin 3]
- G [pin 1]
- S [pin 2]

### Q4 — [AO3400A](https://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
- Functional Group: OUTPUT Q4 Output 2 Driver
- Manufacturer Name: Alpha & Omega Semiconductor Inc\.
- Role Details: ARM\_BUS output 2 low\-side driver
- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: Transistor
- Role: Switching

**Pins:**
- D [pin 3]
- G [pin 1]
- S [pin 2]

### SW1 — [HX 3x4x2\-2P\-1\.6N TACTILE SWITCH](https://flux.ai/adrian95/hx-3x4x2-2p-1p6n-tactile-switch~l8.md)

- Role Details: Manual NRST to GND
- Part Type: Switch
- Datasheet URL: https://www\.lcsc\.com/datasheet/C49234124\.pdf
- Manufacturer Name: hanxia
- Role: Switching
- LCSC Part Number: C49234124
- Manufacturer Part Number: HX 3x4x2\-2P\-1\.6N TACTILE SWITCH
- Functional Group: CONTROL U1 Flight MCU
- License: https://creativecommons\.org/licenses/by/4\.0/

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

### SW2 — [HX 3x4x2\-2P\-1\.6N TACTILE SWITCH](https://flux.ai/adrian95/hx-3x4x2-2p-1p6n-tactile-switch~l8.md)

- Role Details: Manual BOOT0 to 3V3
- Part Type: Switch
- Role: Switching
- Functional Group: CONTROL U1 Flight MCU
- Datasheet URL: https://www\.lcsc\.com/datasheet/C49234124\.pdf
- Manufacturer Name: hanxia
- LCSC Part Number: C49234124
- Manufacturer Part Number: HX 3x4x2\-2P\-1\.6N TACTILE SWITCH
- License: https://creativecommons\.org/licenses/by/4\.0/

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

### U1 — [STM32F405RGT6](https://flux.ai/jharwinbarrozo/stm32f405rgt6~ssm.md)

- Functional Group: CONTROL U1 Flight MCU
- Role: Main Controller
- Manufacturer Part Number: STM32F405RGT6
- Manufacturer Name: STMicroelectronics
- Role Details: STM32F405 flight computer MCU
- Part Type: Integrated Circuit
- Datasheet URL: http://www\.st\.com/content/ccc/resource/technical/document/datasheet/ef/92/76/6d/bb/c2/4f/f7/DM00037051\.pdf/files/DM00037051\.pdf/jcr:content/translations/en\.DM00037051\.pdf

**Pins:**
- BOOT0 [pin 60]
- NRST [pin 7]
- PA0\_WKUP [pin 14]
- PA1 [pin 15]
- PA10 [pin 43]
- PA11 [pin 44]
- PA12 [pin 45]
- PA13 [pin 46]
- PA14 [pin 49]
- PA15 [pin 50]
- PA2 [pin 16]
- PA3 [pin 17]
- PA4 [pin 20]
- PA5 [pin 21]
- PA6 [pin 22]
- PA7 [pin 23]
- PA8 [pin 41]
- PA9 [pin 42]
- PB0 [pin 26]
- PB1 [pin 27]
- PB10 [pin 29]
- PB11 [pin 30]
- PB12 [pin 33]
- PB13 [pin 34]
- PB14 [pin 35]
- PB15 [pin 36]
- PB2 [pin 28]
- PB3 [pin 55]
- PB4 [pin 56]
- PB5 [pin 57]
- PB6 [pin 58]
- PB7 [pin 59]
- PB8 [pin 61]
- PB9 [pin 62]
- PC0 [pin 8]
- PC1 [pin 9]
- PC10 [pin 51]
- PC11 [pin 52]
- PC12 [pin 53]
- PC13 [pin 2]
- PC14 [pin 3]
- PC15 [pin 4]
- PC2 [pin 10]
- PC3 [pin 11]
- PC4 [pin 24]
- PC5 [pin 25]
- PC6 [pin 37]
- PC7 [pin 38]
- PC8 [pin 39]
- PC9 [pin 40]
- PD2 [pin 54]
- PH0 [pin 5]
- PH1 [pin 6]
- VBAT [pin 1]
- VCAP\_1 [pin 31]
- VCAP\_2 [pin 47]
- VDD1 [pin 19]
- VDD2 [pin 32]
- VDD3 [pin 48]
- VDD4 [pin 64]
- VDDA [pin 13]
- VSS1 [pin 18]
- VSS2 [pin 63]
- VSSA [pin 12]

### U2 — [ICM\-42688\-P](https://flux.ai/jecstronic/icm-42688-p~5tz.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Datasheet URL: https://mm\.digikey\.com/Volume0/opasdata/d220001/medias/docus/495/ICM\-42688\-P\_DS\_Rev1\.2\.pdf
- Role Details: 6\-axis IMU on shared SPI1 bus
- Part Type: Sensor
- Functional Group: SENSOR U2 ICM\-42688\-P IMU
- Manufacturer Part Number: ICM\-42688\-P
- Manufacturer Name: TDK InvenSense
- Role: Inertial Sensor

**Pins:**
- AP\_CS [pin 12]
- AP\_SCL/AP\_SCLK [pin 13]
- AP\_SDA/AP\_SDIO/AP\_SDI [pin 14]
- AP\_SDO/AP\_AD0 [pin 1]
- GND [pin 6]
- INT1/INT [pin 4]
- INT2/FSYNC/CLKIN [pin 9]
- RESV\_10 [pin 10]
- RESV\_11 [pin 11]
- RESV\_2 [pin 2]
- RESV\_3 [pin 3]
- RESV\_7 [pin 7]
- VDD [pin 8]
- VDDIO [pin 5]

### U3 — [BMP581](https://flux.ai/jecstronic/bmp581~7m6.md)

- Role: Pressure Sensor
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Name: Bosch Sensortec
- Role Details: Barometric pressure sensor on shared SPI1 bus
- Functional Group: SENSOR U3 BMP581 Barometer
- Datasheet URL: https://www\.bosch\-sensortec\.com/media/boschsensortec/downloads/datasheets/bst\-bmp581\-ds004\.pdf
- Manufacturer Part Number: BMP581
- Part Type: Sensor

**Pins:**
- CSB [pin 6]
- INT [pin 7]
- SCK [pin 2]
- SDI [pin 4]
- SDO [pin 5]
- VDD [pin 10]
- VDDIO [pin 1]
- VSS [pin 8]
- VSS [pin 9]
- VSS [pin 3]

### U4 — [MMC5983MA](https://flux.ai/lcsc/mmc5983ma~t01c.md)

- Package or Case Code: LGA\-16\_L3\.0\-W3\.0\-P0\.50\-BL\_SQ
- JLCPCB Part Class: Extended Part
- Role Details: 3\-axis magnetometer on shared SPI1 bus
- Role: Magnetic Sensor
- LCSC Part Number: C404329
- Part Type: Magnetic Sensors
- Manufacturer Part Number: MMC5983MA
- Manufacturer Name: MEMSIC\(美新\)
- Product Info Url: https://lcsc\.com/product\-detail/Magnetic\-Sensors\_MEMSIC\-MMC5983MA\_C404329\.html
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/1912111437\_MEMSIC\-MMC5983MA\_C404329\.pdf
- Functional Group: SENSOR U4 MMC5983MA Magnetometer

**Pins:**
- CAP [pin 10]
- GND [pin 9]
- GND [pin 11]
- INT [pin 15]
- NC [pin 12]
- NC [pin 14]
- NC [pin 7]
- NC [pin 6]
- NC [pin 8]
- NC [pin 3]
- SCL/SPI\_SCK [pin 1]
- SDA/SPI\_SDI [pin 16]
- SPI\_CS [pin 4]
- SPI\_SDO [pin 5]
- VDD [pin 2]
- VDDIO [pin 13]

### U5 — [AP2112K\-3\.3TRG1](https://flux.ai/adrian95/ap2112k-33trg1~zlq.md)

- Role Details: Fixed 3\.3 V LDO; load and thermal rating pending full power budget
- Symbol Style: parametric\-v1
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Name: Diodes Incorporated
- Role: Power Conversion
- Manufacturer Part Number: AP2112K\-3\.3TRG1
- Part Type: Integrated Circuit
- Functional Group: POWER U5 3V3 LDO
- Datasheet URL: https://www\.diodes\.com/assets/Datasheets/AP2112\.pdf

**Pins:**
- EN [pin 3]
- GND [pin 2]
- NC [pin 4]
- VIN [pin 1]
- VOUT [pin 5]

### U6 — [USBLC6\-2SC6](https://flux.ai/vasy_skral/usblc6-2sc6~g1b.md)

- Manufacturer Part Number: USBLC6\-2SC6
- Role: Protection
- Functional Group: INTERFACE J1 USB\-C
- Symbol Style: parametric\-v1
- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: Protection
- Manufacturer Name: STMicroelectronics
- Datasheet URL: https://www\.st\.com/content/ccc/resource/technical/document/datasheet/06/1d/48/9c/6c/20/4a/b2/CD00050750\.pdf/files/CD00050750\.pdf/jcr:content/translations/en\.CD00050750\.pdf
- LCSC Part Number: C7519
- Role Details: USB D\+/D\- protection with VBUS reference

**Pins:**
- GND [pin 2]
- I/O1 [pin 6]
- I/O1 [pin 1]
- I/O2 [pin 3]
- I/O2 [pin 4]
- VBUS [pin 5]

### Y1 — [ECS\-80\-10\-33\-CGN\-TR3](https://flux.ai/adrian95/ecs-80-10-33-cgn-tr3~zse.md)

- Role: Timing
- Manufacturer Part Number: ECS\-80\-10\-33\-CGN\-TR3
- License: https://creativecommons\.org/licenses/by/4\.0/
- Role Details: U1 HSE 8MHz crystal, 10pF load, four\-pad 3\.2x2\.5mm package
- Datasheet URL: https://ecsxtal\.com/store/pdf/ecx\-32\.pdf
- Functional Group: CONTROL U1 Flight MCU
- Manufacturer Name: ECS Inc\.
- Part Type: Oscillator

**Pins:**
- GND\_1 [pin 2]
- GND\_2 [pin 4]
- IN/OUT [pin 1]
- OUT/IN [pin 3]

*The full schematic, PCB layout, bill of materials, and interactive design are available at [https://flux\.ai/jayanthan/flight\-computer\-3\~p2](https://flux.ai/jayanthan/flight-computer-3~p2).*

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*Generated from [https://flux\.ai/jayanthan/flight\-computer\-3\~p2](https://flux.ai/jayanthan/flight-computer-3~p2)*