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Std edition spi uart hub

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License: GPL 3.0

Published Time: 2020-10-27 03:08:00
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Description

Shield fo Raspberry PI zero W.

Introduction

This shield created for moving many digital servos as LOBOT LX-16A or LOBOT LX15D.

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. You can assembly all components, except for STM32F413VGT3 chip. This chip not included in stock of LCSC. Also service JLCPCB does not assemly connectors. But all connectors of BOM available in stock LCSC.

design drawing
schematic diagram
1 /
PCB
1 /
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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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