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Fire-28-c

piersfinlayson·one-rom·hardware/pcb/verified/fire-28-c/fire-28-c.kicad_pcb

Top view of the Fire-28-c PCB
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Fire-28-c is an open source RP2040/RP2350 PCB design by piersfinlayson: a 2-layer, 18.9 × 36.6 mm board with 46 components (20 distinct parts). It is built around the RP2354B, 28 Pin ROM, AP2112K-3.3, USBLC6-2P6. Filed under retro computing.

The most flexible and powerful ROM replacement for retro systems - using a Raspberry Pi RP2350 microcontroller.

A variant of the 28 pin using the RP2354B MCU, making use of its extra GPIOs to provide X pins and more efficient use of flash for most image types. Uses a flat (inline) USB-C connector.

Has components on both sides of the board.

Changes from fire-28-a: - Adds a neo-pixel LED, GPIO 44, alongside the status LED at GPIO 45. - SEL pins have been swapped around for consistency with the latest 28, 32 and 40 pin designs. The two right-most SEL pins are now ADC (non-5V tolerant) pins, with the othe two being 5V tolerant. - Adds 2 more image select jumpers, matching the 4 of the 24/32/40 pins…

Built around

RP2354B28 Pin ROMAP2112K-3.3USBLC6-2P6

Parts list

46 components, 20 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
RP2354B
U1
1
28 Pin ROM
U2
1
AP2112K-3.3
U3
1
USBLC6-2P6
U4
1
CRYSTAL_GND24
Crystal_GND24
Y1
1
USB_C_RECEPTACLE_USB2.0_16P
USB_C_Receptacle_USB2.0_16P
J1
1
Conn_02x04_Odd_Even
J2
2
Conn_01x02_Pin
J3, J4
1
C25503345
LED_Small
D1
2
1N5819WS
D2, D3
1
XL-1010RGBC-WS2812B
D4
1
3.3U
3.3u
L1
7
4.7UF
4.7uF
C1, C2, C3, C7, C13, C14, C15
11
0.1UF
0.1uF
C4, C5, C6, C8, C9, C10, C11, C12 +3
2
4.7UF
4.7uF
C16, C17
2
15PF
15pF
C18, C19
3
10K
R1, R7, R8
4
1K
R2, R3, R5, R6
1
33R
R4
2
5K1
R9, R10

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