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2 layers21.3 × 40.9 mmA3982slb board, the printed circuit board in 3D

In the schematic, R1 which determines the fixed off-time is set 25kΩ. However, the BOD lists the URL for 30kΩ because I could not find the one with 25kΩ.

Size
21.3 × 40.9 mm
Copper layers
2
Thickness
1.6 mm
Parts
16
Nets
21
Pads
63
Tracks, vias
134, 16
Pours
1
Routed
Yes
KiCad
KiCad 4
Created
29 Apr 2017
Updated
2 Mar 2018

Overview

A3982slb board is an open-source printed circuit board by wshito, from the wshito/Micromouse2017 repository on GitHub. It is a 2-layer board of 21.3 × 40.9 mm with 16 parts on 21 nets, routed with 134 tracks and 16 vias.

Its parts include 7 capacitors, 4 resistors, 2 connectors and 1 IC.

README

prototype/a3982slb_board/kicad/a3982slb_board/README.md

The evaluation board for the stepping motor driver a3982slb

The Characteristics of a3982slb stepping motor driver

  • The bipolar stepper motors in full- and half-step modes.
  • No power-on or off sequencing is required.
  • Automatically chooses the decay mode from SLOW DECAY and MIXED DECAY.
  • Internal UVLO and thermal shutdown circuitry.
  • The output drive capacity of up to 35V and ±2A.
  • The logic voltage accepts between 3.0V and 5.5V.

Files

  • a3982slb_board.pro: The main project file for KiCAD.
  • a3982slb_board.sch: KiCAD schematic file.
  • a3982slb_board.kicad_pcb: KiCAD pcb file.
  • a3982slb_board-cache.lib: KiCAD cache for parts library.
  • output: Contains biproducts from the KiCAD project.
    • a3982slb_board.csv: Bill of Devices which includes the URLs of shops.
    • a3982slb_board_Gerber.zip: Gerber files for Elecrow or PCBGOGO.
    • board_layout.pdf

About the Bill of Devices

In the schematic, R1 which determines the fixed off-time is set 25kΩ. However, the BOD lists the URL for 30kΩ because I could not find the one with 25kΩ. This makes the fixed off-time approximately 6.060606us longer and becomes about 36.363636us.

Japanese translation

a3982slb ステッピングモーター・ドライバの特徴

  • バイポーラ駆動方式のステッピングモーター・ドライバ.
  • ロジック側電源とモーター側電源の ON・OFF シーケンスに制約がない.どちらから先に電源を入れても,また,OFFにしても問題ない.
  • ステップ信号を入力するだけで,チョッピング制御の電流減衰モードが SLOW DECAY と MIXED DECAY から自動選択される.
  • 電源電圧低下検出保護機能(UVLO)と熱保護機能(TSD)を搭載.
  • 出力は 35V,±2.0A まで対応.
  • ロジック電源は 3.0 〜 5.5V 対応.

Files

  • a3982slb_board.pro: KiCAD用プロジェクトファイル.
  • a3982slb_board.sch: KiCAD用回路図ファイル.
  • a3982slb_board.kicad_pcb: KiCAD用基盤レイアウトファイル.
  • a3982slb_board-cache.lib: KiCAD cache for parts library.
  • output: KiCADプロジェクトから生成したファイルを格納.
    • a3982slb_board.csv: パーツの入手先URLを記したBOD.
    • a3982slb_board_Gerber.zip: Elecrow か PCBGOGO 用のガーバーファイルのアーカイブ.
    • board_layout.pdf: 基盤レイアウト.

BOD について

回路図では,固定OFF時間を決める R1 は 25kΩ になっているが,部品が見つけられなかったので,BOD では 30kΩ の入手先を記載している.これにより,固定時間が約 6.060606μ 秒長くなり 36.363636μ 秒になる.ちなみに 25kΩなら約 30.30303μ 秒である.

使い方

  • Logic 電源を 3.3V に設定し,可変抵抗は 0Ω 側最小値にセット.
  • 負荷側電源を 9V 〜 11.1V に設定.
  • Vbb_Load 側にあるGND は Logic 電源用の GND.Vbb_Logic 側にある GND がモーター電源用 GND.サイドが逆になるので注意.両者は基盤上で1点アースを取っている.

Parts

16
QtyValueFootprintReferences
30.22uCapacitors_SMD:C_0603_HandSolderingC2, C5, C7
20.1uCapacitors_SMD:C_0603_HandSolderingC1, C3
20.33Resistors_SMD:R_2512_HandSolderingR1, R2
1100uwshito_FootPrints:UCB1H101MNL1GS_HandSolderingC4
110Kwshito_FootPrints:G43ARV1
110uCapacitors_SMD:C_0603_HandSolderingC6
12.4KResistors_SMD:R_0603_HandSolderingR4
125KResistors_SMD:R_0603_HandSolderingR3
1A3982Housings_SOIC:SOIC-24W_7.5x15.4mm_Pitch1.27mmU1
1CONN_01X06Pin_Headers:Pin_Header_Straight_1x06P2
1CONN_01X07Pin_Headers:Pin_Header_Straight_1x07P1
1TEST_1PConnectors:PINTSTTest

Questions

How big is the A3982slb board PCB?

It measures 21.3 × 40.9 mm and has 2 copper layers, 1.6 mm thick.

What parts does the A3982slb board use?

16 parts. 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 A3982slb board KiCad files?

From the wshito/Micromouse2017 repository on GitHub, at the commit this page was made from: the board is prototype/a3982slb_board/kicad/a3982slb_board/a3982slb_board.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the A3982slb board design in my own project?

Its repository states no licence, so its author keeps all rights: ask wshito before reusing the design.

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