2 layers74 × 63.2 mm
2 layers99.8 × 99.8 mm
My Motorola IO
lenzjo/MECB-SYS-IO1I have brought out all available outputs along the top of the PCB, however, the PS/2 clock and data signals are also on the connector (pins C11 and A12 repectively) as are TxD (A16), RxD (A17), RTS (C16) and CTS (C19).
- Size
- 99.8 × 99.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 37
- Nets
- 103
- Pads
- 279
- Tracks, vias
- 867, 285
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 19 Jul 2024
- Updated
- 13 Oct 2024
Overview
My Motorola IO is an open-source printed circuit board by lenzjo, from the lenzjo/MECB-SYS-IO repository on GitHub. It is a 2-layer board of 99.8 × 99.8 mm with 37 parts on 103 nets, routed with 867 tracks and 285 vias.
It is built around the ATTINY261A-PU and BAT42. Its parts include 9 capacitors, 6 resistors, 5 ICs, 4 connectors and 2 diodes. It belongs with the AVR (ATmega, ATtiny) and FPGA and CPLD boards of this library.
Main components
2
ATTINY261A-PU
DIP-20-40℃~+85℃ 1.8V~5.5V 10bit 128Byte 128Byte 16 20MHz 2KB 8 Bit AVR Built-in FLASH DIP-20 Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
BAT42
DO-35-65℃~+125℃ 200mA 30V 4A 500nA@25V 650mV@50mA Independent DO-35 Schottky Diodes ROHSSTMicroelectronicsSchottky Diodes
README
README.mdTLC SYS-IO for MECB
This board consists of the following:
-
SCC2691 ACIA
-
WDC6522N
-
RTC72421 - with battery backup
-
ATTINY261A-P -for PS/2 Keyboard
I have brought out all available outputs along the top of the PCB, however, the PS/2 clock and data signals are also on the connector (pins C11 and A12 repectively) as are TxD (A16), RxD (A17), RTS (C16) and CTS (C19).
Use at your own risk as I have not had time yet to fully test the PCB.
Also, the battery holder is an SMD part. It's easy enough to attach, I used a heat gun from underneath the pcb.
UPDATES
1.3 - Fixed Reset line on SCC2691, updated battery holder.
1.4 - Fixed KYBD clk line.
Parts
37| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 100nF | Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm | C3, C4, C5, C6, C7 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 2 | 10K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2 |
| 2 | 1K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R4, R5 |
| 2 | 22pF | Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm | C1, C2 |
| 2 | 2N7000 | Package_TO_SOT_THT:TO-92_Inline | Q1, Q2 |
| 2 | BAT42 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2 |
| 1 | 100nF | Capacitor_THT:C_Disc_D5.1mm_W3.2mm_P5.00mm | C9 |
| 1 | 1M | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R6 |
| 1 | 1uF | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C8 |
| 1 | 3.6864Mhz | Crystal:Crystal_HC49-U_Vertical | Y1 |
| 1 | 3K3 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3 |
| 1 | ATF16V8 | Package_DIP:DIP-20_W7.62mm_Socket_LongPads | U1 |
| 1 | ATtiny261A-P | Package_DIP:DIP-20_W7.62mm_LongPads | U6 |
| 1 | Battery_Cell | TLC_Stuff:SMD CR2032 | BT1 |
| 1 | Conn_02x12_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x12_P2.54mm_Horizontal | J6 |
| 1 | FTDI_con | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Horizontal | P1 |
| 1 | MECB_64AC | MyCustomFootprintLibrary:DIN41612_C_2x32_C64AC_Male_Horizontal_THT | J1 |
| 1 | PS/2_Connector | TLC_Stuff:PS2_mini_DIN | J2 |
| 1 | RTC72421 | Package_DIP:DIP-18_W7.62mm_LongPads | U2 |
| 1 | SCC2691 | Package_DIP:DIP-24_W7.62mm_LongPads | U4 |
| 1 | USB 5v | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP2 |
| 1 | WD65C22 | Package_DIP:DIP-40_W15.24mm_LongPads | U5 |
| 1 | myLogo | TLC_Stuff:Logo11x13 | L1 |
| 1 | ~{NMI} SS | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | JP1 |
Questions
How big is the My Motorola IO PCB?
It measures 99.8 × 99.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the My Motorola IO use?
37 parts, built around the ATTINY261A-PU and BAT42. 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 My Motorola IO KiCad files?
From the lenzjo/MECB-SYS-IO repository on GitHub, at the commit this page was made from: the board is My-Motorola-IO.kicad_pcb and its schematic My-Motorola-IO.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the My Motorola IO design in my own project?
Its repository states no licence, so its author keeps all rights: ask lenzjo before reusing the design.
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