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STD spi uart hub
License: GPL 3.0
Mode: Editors' pick
- 0
Update time：
2020-10-26 19:08:00
Creation time：
2020-01-24 08:27:00
Description
# Shield fo Raspberry PI zero W. #
# Introduction #
This shield created for moving many digital servos as [LOBOT LX-16A or LOBOT LX15D](www.lobot-robot.com).
# Desing #
This shield included microcontroller stm32f413 and st-link scheme on stm32f103 base. Stm32f413 connected to raspberry connector via SPI, UART and I2C interfaces. You can to use stm32f413 as:
- USB/UART bridge for raspberry console (microcontroller has USB interface);
- UART hub (all 10 UARTs of microcontroller brought to a separate connector);
- and so on.
Hardware features jf shield:
- connect to raspbery via different interfaces;
- onboard debugger;
- standalone work on cortex M4 CPU without connect to raspberry;
- 3.3 to 5.0 bidirectional voltage shifter on UARTS connector;
- uarts worked in half-duplex 1-wire mode.
# Manufacturing #
This project optimized for manufacturing on [JLCPCB](https://jlcpcb.com/). You can assembly all components, except for STM32F413VGT3 chip. This chip not included in stock of [LCSC](https://lcsc.com/). Also service [JLCPCB](https://jlcpcb.com/) does not assemly connectors. But all connectors of BOM available in stock [LCSC](https://lcsc.com/).
Design Drawing
schematic diagram
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PCB
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| ID | Name | Designator | Footprint | Quantity |
|---|---|---|---|---|
| 1 | 100nF | C3,C4,C5,C6,C7,C10,C14,C15,C16,C17,C18,C19,C20,C21,C22,C23,C24,C26,C27 | 0603 | 19 |
| 2 | 2.2 uF | C11,C12 | 0603 | 2 |
| 3 | 4.7KΩ | R16,R17 | 0603 | 2 |
| 4 | 32.768KHz | X3 | FC-135R_L3.2-W1.5 | 1 |
| 5 | STM32F103CBT6 | U4 | LQFP-48_7X7X05P | 1 |
| 6 | 22Ω | R3,R4,R23,R24,R13 | 0603 | 5 |
| 7 | 1M | R19,R42 | 0603 | 2 |
| 8 | 120Ω | R1,R2 | 0603 | 2 |
| 9 | 8MHz | X1,X2 | SMD-5032_2P | 2 |
| 10 | 10uF | C30,C31 | C0805 | 2 |
| 11 | Header-Male-2.54_2x2 | P1 | HDR-TH_4P-P2.54-V-R2-C2-S2.54 | 1 |
| 12 | ESDA6V1SC6 | U5,U6 | SOT-23-6 | 2 |
| 13 | LD39050PU33R | U3 | DFN-6_L3.0-W3.0-P0.95-LS3.1-TL-EP | 1 |
| 14 | TEST-POINT3X4 | TP1,TP2,TP3,TP4 | PAD.03X.04 | 4 |
| 15 | micro USBFemale | USB2,USB3 | MICRO-USB-1 | 2 |
| 16 | 10KΩ | R14,R20,R15,R11 | 0603 | 4 |
| 17 | 20pF | C1,C2,C8,C9 | 0603 | 4 |
| 18 | 12pF | C13,C25 | 0603 | 2 |
| 19 | LTST-C155KGJRKT | LED1 | LED-ARRAY-SMD_4P-L3.2-W2.7-BR | 1 |
| 20 | Pi Zero | U2 | PI ZERO WITH HOLES | 1 |
| 21 | Header-Male-2.54_2x6 | H1 | HDR-TH_12P-P2.54-V-R2-C6-S2.54 | 1 |
| 22 | 1.5KΩ | R6,R7 | 0603 | 2 |
| 23 | SOLDER BRIDGE | SB1,SB3,SB4,SB7,SB8,SB2,SB5 | SOLDER_BRIDGE | 7 |
| 24 | STM32F413VGT3 | U1 | LQFP-100_14X14X05P | 1 |
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