4 layers166.7 × 58.4 mm
2 layers65 × 56 mm
The Raspberry Pi Hat
- Size
- 65 × 56 mm
- Copper layers
- 2
- Thickness
- 1.53 mm
- Parts
- 153
- Nets
- 123
- Pads
- 402
- Tracks, vias
- 873, 143
- Pours
- 7
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 9 May 2022
- Updated
- 2 Sep 2022
Overview
KCH is an open-source printed circuit board by srobo, from the srobo/kch-hw repository on GitHub. It is a 2-layer board of 65 × 56 mm with 153 parts on 123 nets, routed with 873 tracks and 143 vias.
It is built around the CAT24C32WI-GT3, 2N7002KDW and FM-B2020RGBA-HG, with the NCE3401AY, AO3407A and BZT52C6V8 among its other parts. Its parts include 85 resistors, 20 diodes, 16 transistors, 12 capacitors and 4 connectors.
Main components
10
CAT24C32WI-GT3
SOIC-8-40℃~+85℃ 0.4us、0.9us、3.5us 1,000,000 cycles 1.7V~5.5V 100 years 1MHz 2mA 32Kbit 5ms 5uA Hardware write protection function、Noise suppression function、Built-in power-on reset (POR) I2C SOIC-8 EEPROM ROHSonsemiEEPROM
2N7002KDW
SOT-363-55℃~+150℃ 10pF 150mW 2 N-Channel 2.5V 300mA 30pF 40pF 5.3Ω@4.5V 60V N-Channel ±20V SOT-363 MOSFETs ROHSCBIMOSFETs
FM-B2020RGBA-HG
SMD,2.1x2.1mm-30℃~+85℃ 110° 1mm 2.1mm 2.1mm B:460nm~480nm、R:615nm~630nm、G:515nm~540nm Common Anode R:1.6V~2.4V、G:2.4V~3.2V、B:2.4V~3.2V R:20mA、G:20mA、B:20mA R:30mcd~110mcd、G:90mcd~270mcd、B:12mcd~40mcd R:48mW、G:64mW、B:64mW SMD,2.1x2.1mm RGB LEDs ROHSFoshan NationStar OptoelectronicsRGB LEDs
NCE3401AY
SOT-23-55℃~+150℃ 1 P-Channel 1.3V 1.3W 115pF 30V 4.4A 75pF 80mΩ@2.5V 9.5nC@4.5V 950pF P-Channel SOT-23 MOSFETs ROHSWuxi NCE Power SemiconductorMOSFETsAO3407A
SOT-231 P-Channel 1.4W 1.8V 14.3nC@4.5V 30V 37mΩ@10V、52mΩ@4.5V 4.2A 700pF 75pF SOT-23 MOSFETs ROHSUMWMOSFETs
BZT52C6V8
SOD-1231 Independent 30Ω 500mW 500nA@3.5V 6.46V~7.14V 6.8V SOD-123 Zener Diodes ROHSMDDZener Diodes
DMMT5401
SOT-26(SC74R)-55℃~+150℃ 150V 2 PNP 200mA 200mV 300MHz 300mW 50uA 5V 60 PNP SOT-26(SC74R) Bipolar (BJT) ROHSDiodes IncorporatedBipolar (BJT)PMV20ENR
SOT-23-55℃~+150℃ 1 N-channel 1.2W 10.8nC@10V 21mΩ@10V 30V 35pF 435pF 7.6A SOT-23 MOSFETs ROHSNexperiaMOSFETs
SMAJ15CA
DO-214AC(SMA)ESD And Surge Protection (TVS/ESD)hongjiacheng
SPM6530T-3R3M
SMD,7.1x6.5mm29.7mΩ 3.3uH 6.8A 7.3A ±20% SMD,7.1x6.5mm Power Inductors ROHSTDKPower Inductors
README
readme.mdKCH - Raspberry Pi Hat
A Raspberry Pi 4 add-on board to protect and power the Pi from the v4 SR kit, and provide a visual indicator of the state of the brain board's software as detailed in the specification.
The UI
The UI is illustrated below.
Manufacturing
The board was designed to be manufactured using JLCPCB for both the PCB and assembly. This is using as 2 layer board with single sided assembly. The two through-hole connectors are rear-mounted and manually added after.
The BOM and assembly files can be generated with KiCAD JLCPCB tools and the JLCPCB part codes are already assigned.
Pinout
| Header Pin | GPIO | Function |
|---|---|---|
| 1 | - | - |
| 2 | - | 5V |
| 3 | - | - |
| 4 | - | 5V |
| 5 | - | - |
| 6 | - | GND |
| 7 | 4 | USER C Red LED |
| 8 | 14 | UART TX |
| 9 | - | GND |
| 10 | 15 | UART RX |
| 11 | 17 | USER C Blue LED |
| 12 | 18 | USER C Green LED |
| 13 | 27 | USER B Red LED |
| 14 | - | GND |
| 15 | 22 | USER B Blue LED |
| 16 | 23 | USER B Green LED |
| 17 | - | 3.3V |
| 18 | 24 | USER A Red LED |
| 19 | 10 | USER A Green LED |
| 20 | - | GND |
| 21 | 9 | Start LED |
| 22 | 25 | USER A Blue LED |
| 23 | 11 | Code LED |
| 24 | 8 | WiFi LED |
| 25 | - | GND |
| 26 | 7 | BOOT 20% LED |
| 27 | 0 | EEPROM SDA |
| 28 | 1 | EEPROM SCL |
| 29 | 5 | BOOT 40% LED |
| 30 | - | GND |
| 31 | 6 | BOOT 80% LED |
| 32 | 12 | BOOT 60% LED |
| 33 | 13 | BOOT 100% LED |
| 34 | - | GND |
| 35 | 19 | Heartbeat LED |
| 36 | 16 | Comp LED |
| 37 | 26 | Status Red LED |
| 38 | 20 | Status Green LED |
| 39 | - | GND |
| 40 | 21 | Status Blue LED |
Parts
153| Qty | Value | Footprint | References |
|---|---|---|---|
| 29 | 1k | Resistor_SMD:R_0402_1005Metric | R1, R18, R20, R25, R26, R30, R32, R34, R35, R37, R39, R42, R45, R48, R50, R53 +13 |
| 26 | 10k | Resistor_SMD:R_0402_1005Metric | R4, R5, R15, R17, R19, R23, R24, R27, R33, R36, R40, R41, R44, R47, R49, R51 +10 |
| 11 | 2N7002KDW | Package_TO_SOT_SMD:SOT-363_SC-70-6 | Q6, Q7, Q8, Q9, Q10, Q11, Q12, Q13, Q14, Q15, Q16 |
| 11 | Green | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D3, D4, D5, D7, D8, D9, D10, D11, D14, D15, D16 |
| 10 | 3k3 | Resistor_SMD:R_0402_1005Metric | R10, R11, R21, R22, R28, R29, R31, R38, R43, R46 |
| 8 | 2k2 | Resistor_SMD:R_0402_1005Metric | R52, R54, R61, R63, R70, R72, R79, R81 |
| 5 | 100n | Capacitor_SMD:C_0402_1005Metric | C1, C2, C4, C9, C10 |
| 5 | 22u | Capacitor_SMD:C_1206_3216Metric | C3, C6, C7, C8, C11 |
| 4 | 3mm_Mounting_Hole | MountingHole:MountingHole_3.2mm_M3_ISO14580_Pad | H1, H2, H3, H4 |
| 4 | FM-B2020RGBA-HG | project_footprints:FM-B2020RGBA-HG | D17, D18, D19, D20 |
| 4 | TestPoint | TestPoint:TestPoint_Pad_D2.0mm | TP1, TP2, TP3, TP4 |
| 2 | 0R | Resistor_SMD:R_0402_1005Metric | R83, R85 |
| 2 | 3k9 | Resistor_SMD:R_0402_1005Metric | R2, R3 |
| 2 | Blue | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D12, D13 |
| 2 | DNP | Capacitor_SMD:C_0402_1005Metric | C5, C12 |
| 2 | NCE3401AY | Package_TO_SOT_SMD:SOT-23 | Q3, Q4 |
| 1 | 100k | Resistor_SMD:R_0402_1005Metric | R8 |
| 1 | 18k | Resistor_SMD:R_0402_1005Metric | R9 |
| 1 | 1k5 | Resistor_SMD:R_0402_1005Metric | R6 |
| 1 | 220R | Resistor_SMD:R_0402_1005Metric | R14 |
| 1 | 2A | Resistor_SMD:R_0603_1608Metric | F1 |
| 1 | 40HAT | Connector_PinSocket_2.54mm:PinSocket_2x20_P2.54mm_Vertical | J3 |
| 1 | 47K | Resistor_SMD:R_0402_1005Metric | R16 |
| 1 | 56k | Resistor_SMD:R_0402_1005Metric | R12 |
| 1 | 8k2 | Resistor_SMD:R_0402_1005Metric | R13 |
| 1 | AO3407A | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | AP63200T | Package_TO_SOT_SMD:SOT-23-6 | U2 |
| 1 | BZT52C6V8 | Diode_SMD:D_SOD-123 | D6 |
| 1 | CAT24C32WI | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1 |
| 1 | CTBP9550/2 | project_footprints:CTBP9550-2 | J1 |
| 1 | DMMT5401 | Package_TO_SOT_SMD:SOT-23-6 | Q5 |
| 1 | DNP | Resistor_SMD:R_0402_1005Metric | R84 |
| 1 | LOGO | project_footprints:bee | G*** |
| 1 | LOGO | project_footprints:QRRef | G*** |
| 1 | LOGO | project_footprints:SR_LOGO | G*** |
| 1 | PMV20EN | Package_TO_SOT_SMD:SOT-23 | Q2 |
| 1 | Red | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D2 |
| 1 | SMAJ15CA | Diode_SMD:D_SMA | D1 |
| 1 | SPM6530T-3R3M | project_footprints:MWSA0603 | L1 |
| 1 | Serial | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J4 |
| 1 | Write EEPROM | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2 |
The 152 most common of 153 parts.
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Questions
How big is the KCH PCB?
It measures 65 × 56 mm and has 2 copper layers, 1.53 mm thick.
What parts does the KCH use?
153 parts, built around the CAT24C32WI-GT3, 2N7002KDW, FM-B2020RGBA-HG and NCE3401AY. 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 KCH KiCad files?
From the srobo/kch-hw repository on GitHub, at the commit this page was made from: the board is pcb/KCH.kicad_pcb and its schematic pcb/KCH.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the KCH design in my own project?
Its repository states no licence, so its author keeps all rights: ask srobo before reusing the design.