6 layers90 × 153 mm
Blackpants
o7-machinehum/Blackpants
Open blackpants.kicadpro for the active A523 schematic and PCB. It replaces the A33 hierarchy and uses AXP717C + AXP323 with 2GB LPDDR4.
300 parts189MIT
4 layers90 × 153 mm
Blackpants
o7-machinehum/Blackpants189Open blackpants.kicadpro for the active A523 schematic and PCB. It replaces the A33 hierarchy and uses AXP717C + AXP323 with 2GB LPDDR4.
- Size
- 90 × 153 mm
- Copper layers
- 4
- Thickness
- 1.56 mm
- Parts
- 139
- Nets
- 153
- Pads
- 810
- Tracks, vias
- 1,307, 465
- Pours
- 43
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 21 Aug 2025
- Updated
- 17 Sep 2026
Overview
Blackpants is an open-source printed circuit board by o7-machinehum, from the o7-machinehum/Blackpants repository on GitHub, published under the MIT licence. It is a 4-layer board of 90 × 153 mm with 139 parts on 153 nets, routed with 1,307 tracks and 465 vias.
It is built around the STM32F042C6U6, AOZ1280CI and AP3032KTR-G1, with the USB2514BI-AEZG-TR, USBLC6-2SC6 and IP5306 among its other parts. Its parts include 38 capacitors, 33 resistors, 16 diodes, 12 ICs and 12 connectors. It belongs with the STM32 boards of this library.
Main components
12
STM32F042C6U6
UFQFPN-48(7x7)-40℃~+85℃ 1.65V~3.6V 12bit 32 Bit 32KB 38 48MHz 6KB ARM Cortex-M0 Built-in FLASH UFQFPN-48(7x7) Microcontrollers (MCU/MPU/SOC) ROHSSTMicroelectronicsMicrocontrollers (MCU/MPU/SOC)
AOZ1280CI
SOT-23-6-40℃~+85℃ 1 1.2A 1.5MHz 1mA 3V~26V 800mV~26V Adjustable Buck Built-in No Overcurrent Protection、Cycle-by-cycle current limiting、Hiccup current limiting Step-down type SOT-23-6 DC-DC Converters ROHSAlpha & Omega SemiconductorDC-DC ConvertersAP3032KTR-G1
SOT-23-6-40℃~+85℃ 1 1.4A 1MHz 2.7V~9V Boost Built-in DC-DC PWM Under Voltage Protection、Over Voltage Protection、Over-Temperature Protection (OTP) SOT-23-6 LED Drivers ROHSDiodes IncorporatedLED Drivers
USB2514BI-AEZG-TR
TQFN-36-EP(6x6)-40℃~+85℃ 3.3V 4 480Mbps Hub I2C、SMBus USB 2.0 TQFN-36-EP(6x6) USB HUB Controllers ROHSMicrochip TechnologyUSB ConvertersUSBLC6-2SC6
SOT-23-60.35pF、0.8pF 100nA 150W@8/20us 15V 2 5V 6A@8/20us 6V ESD SOT-23-6 ESD and Surge Protection (TVS/ESD) ROHSUMWESD And Surge Protection (TVS/ESD)
IP5306
ESOP-80℃~+70℃ 1 100uA 2.1A 3V 4.2V 4.65V~5.5V Charging IC、Protection IC I2C Lithium Battery ESOP-8 Battery Management ROHSINJOINICBattery Management
MIC2026-1YM-TR
SOIC-8-40℃~+85℃ 1.25A 140mΩ 2 2.7V~5.5V Active High High Side Switch Short-Circuit Protection(SCP)、Undervoltage Protection(UVP)、Over Temperature Protection SOIC-8 Power Distribution Switches ROHSMicrochip TechnologyPower Distribution Switches
TPSGM7227YUWQ10G
QFN-10L(1.4x1.8)Analog Switches, MultiplexersTECH PUBLIC
CL05B104KB54PNC
0402100nF 50V X7R ±10% 0402 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSSamsung Electro-MechanicsMultilayer Ceramic Capacitors MLCC - SMD/SMTLTW-010DCG
SMD,3.7x0.9mm-30℃~+85℃ 115° 120mW 2.25cd 20mA 3.3V Discrete Diode White SMD,3.7x0.9mm LED Indication - Discrete ROHSLite-OnLED Indication - Discrete
KT-0603R
0603-40℃~+85℃ 1.6mm x 0.8mm square LED 1.8V~2.4V 120° 20mA 300mcd 40mW 615nm~630nm 645nm Discrete Diode Red Water Clear 0603 LED Indication - Discrete ROHSHubei KENTO ElecLED Indication - Discrete
USB1046-GF-0190-L-B-A
SMD-40℃~+85℃ 1 1.5A 30V 4P Black Female Type-A USB 2.0 SMD USB Connectors ROHSGlobal Connector Technology (GCT)USB Connectors
README
ee/integrated/README.mdBlackpants hardware
Open blackpants.kicad_pro for the active A523 schematic and PCB. It replaces the A33 hierarchy and uses AXP717C + AXP323 with 2GB LPDDR4.
- Schematic review PDF
- Capture status and interface mapping
- Six-layer layout status and previews
- RAM sourcing
- Source documents
All 65 SoC-to-RAM signal paths are connected. There are 139 open connections overall. Routing remains incomplete; DDR timing and signal/power integrity have not been approved.
Parts
139| Qty | Value | Footprint | References |
|---|---|---|---|
| 17 | 100nF | Capacitor_SMD:C_0402_1005Metric | C6, C8, C10, C11, C13, C14, C15, C16, C23, C27, C31, C33, C45, C47, C49, C50 +1 |
| 13 | 100K | Resistor_SMD:R_0402_1005Metric | R6, R7, R9, R13, R16, R20, R21, R22, R24, R25, R26, R27, R28 |
| 8 | 22uF | Capacitor_SMD:C_0603_1608Metric | C18, C19, C20, C21, C22, C24, C25, C26 |
| 8 | LED | keyboard_leds:LTW-010DCG | D15, D16, D17, D18, D19, D20, D21, D22 |
| 6 | 10uF | Capacitor_SMD:C_0603_1608Metric | C2, C3, C4, C5, C17, C32 |
| 6 | CaseScrew | MountingHole:MountingHole_2.7mm_Pad | H1, H2, H3, H4, H6, H7 |
| 6 | LED | LED_SMD:LED_0603_1608Metric | D2, D3, D4, D5, D6, D8 |
| 5 | 1K | Resistor_SMD:R_0402_1005Metric | R19, R29, R30, R31, R32 |
| 5 | 5.1K | Resistor_SMD:R_0402_1005Metric | R3, R4, R10, R11, R12 |
| 4 | 1uF | Capacitor_SMD:C_0402_1005Metric | C1, C7, C30, C44 |
| 4 | Conn_01x01_Pin | blackpants:1871059-1 | J6, J7, J9, J10 |
| 4 | Jumper_2_Small_Open | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP7, JP8, JP9, JP10 |
| 4 | SolderJumper_2_Bridged | Jumper:SolderJumper-2_P1.3mm_Bridged_Pad1.0x1.5mm | JP2, JP3, JP4, JP6 |
| 4 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U5, U6, U8, U12 |
| 3 | TestPoint | TestPoint:TestPoint_Pad_1.0x1.0mm | TP1, TP2, TP3 |
| 2 | 10pF | Capacitor_SMD:C_0402_1005Metric | C28, C29 |
| 2 | 1k | Resistor_SMD:R_0402_1005Metric | R2, R33 |
| 2 | USB_A | Connector_USB:USB_A_Receptacle_GCT_USB1046 | J4, J5 |
| 1 | 0.5 | Resistor_SMD:R_0402_1005Metric | R17 |
| 1 | 10K | Resistor_SMD:R_0402_1005Metric | R15 |
| 1 | 120Ω@100MHz | Inductor_SMD:L_0402_1005Metric | FB2 |
| 1 | 12K | Resistor_SMD:R_0402_1005Metric | R8 |
| 1 | 15.8k | Resistor_SMD:R_0402_1005Metric | R18 |
| 1 | 18650 Cell | BH-18650-B1BA002:BH-18650-B1BA002 | BT1 |
| 1 | 1M | Resistor_SMD:R_0402_1005Metric | R5 |
| 1 | 1N5819WS | Diode_SMD:D_SOD-323 | D13 |
| 1 | 1uH | Inductor_SMD:L_Changjiang_FXL0420 | L1 |
| 1 | 2 | Resistor_SMD:R_0402_1005Metric | R14 |
| 1 | 2.2uH | Inductor_SMD:L_1008_2520Metric | L2 |
| 1 | 24Mhz | Crystal:Crystal_SMD_Citizen_CS325S-4Pin_3.2x2.5mm | Y1 |
| 1 | 4.7uF | Capacitor_SMD:C_0402_1005Metric | C12 |
| 1 | 49.9k | Resistor_SMD:R_0402_1005Metric | R1 |
| 1 | 4R7 | Resistor_SMD:R_0402_1005Metric | R23 |
| 1 | 6.8uH | Inductor_SMD:L_Vishay_IFSC-1515AH_4x4x1.8mm | L3 |
| 1 | AOZ1280CI | Package_TO_SOT_SMD:SOT-23-6 | U7 |
| 1 | AP3032 | Package_TO_SOT_SMD:SOT-23-6_Handsoldering | U15 |
| 1 | Conn_01x08 | Connector_Harwin:Harwin_M20-89008xx_1x08_P2.54mm_Horizontal | J1 |
| 1 | Conn_01x10 | Connector_Harwin:Harwin_M20-89010xx_1x10_P2.54mm_Horizontal | J2 |
| 1 | Conn_01x20_MountingPin | Connector_FFC-FPC:Hirose_FH12-20S-0.5SH_1x20-1MP_P0.50mm_Horizontal | J12 |
| 1 | Conn_01x20_MountingPin | Connector_FFC-FPC:Amphenol_F32Q-1A7x1-11020_1x20-1MP_P0.5mm_Horizontal | J11 |
| 1 | Conn_ARM_SWD_TagConnect_TC2030-NL | Connector:Tag-Connect_TC2030-IDC-NL_2x03_P1.27mm_Vertical | J3 |
| 1 | IP5306 | Package_SO:HSOP-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.1mm_ThermalVias | U2 |
| 1 | Logo_Open_Hardware_Large | Symbol:OSHW-Logo2_24.3x20mm_SilkScreen | S1 |
| 1 | MIC2026-1xM | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U4 |
| 1 | MSS2P3 | Diode_SMD:D_MicroSMP_AK | D1 |
| 1 | PTS847MM160LSMTR2_LFS | PTS847MM160LSMTR2_LFS:SW_PTS847MM160SMTR2_LFS | PWR_BUTTON1 |
| 1 | Polyfuse | Fuse:Fuse_1206_3216Metric | F1 |
| 1 | STM32F042C6Ux | Package_DFN_QFN:QFN-48-1EP_7x7mm_P0.5mm_EP5.6x5.6mm | U1 |
| 1 | SW_Push | Button_Switch_SMD:SW_Push_1P1T_NO_CK_KSC7xxJ | SW1 |
| 1 | SolderJumper_3_Bridged12 | Jumper:SolderJumper-3_P1.3mm_Bridged2Bar12_RoundedPad1.0x1.5mm | JP5 |
| 1 | TPSGM7227YUWQ10G | Package_DFN_QFN:UQFN-10_1.4x1.8mm_P0.4mm | U11 |
| 1 | USB2514B_Bi | Package_DFN_QFN:QFN-36-1EP_6x6mm_P0.5mm_EP3.7x3.7mm | U3 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J8 |
| 1 | ~ | keyboard:keyboard_arturo182 | U14 |
Questions
How big is the Blackpants PCB?
It measures 90 × 153 mm and has 4 copper layers, 1.56 mm thick.
What parts does the Blackpants use?
139 parts, built around the STM32F042C6U6, AOZ1280CI, AP3032KTR-G1 and USB2514BI-AEZG-TR. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Blackpants KiCad files?
From the o7-machinehum/Blackpants repository on GitHub, at the commit this page was made from: the board is ee/blackpants/blackpants.kicad_pcb and its schematic ee/blackpants/blackpants.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Blackpants design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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