Citrus board

obobed·citrus-board·pcb/citrus-board.kicad_pcb

About the Citrus board

Citrus board is an open source RP2040/RP2350 PCB design by obobed, published on GitHub under the GPL-3.0 license. It is a 4-layer board measuring 27 × 60 mm, with 56 components from 31 distinct parts.

Its main chip is the RP2354A, from the RP2040/RP2350 family. Other key parts include the BQ24074RGT, TPS63000-Q1 and W25Q128JVS. By type, the board carries 24 capacitors, 17 resistors, 4 ICs, 4 connectors, 2 switches and 2 diodes.

It belongs with the power & battery and dev boards & breakouts designs in this gallery.

From the project

a rp2350 devboard in a standard pico form factor

1. Apply the paste 2. Place components 3. Use your preferred equipment (oven, hot-air gun or hotplate) to solder the board 4. Done!

(this section is here because the submission precheck kept giving me warning about this)

Citrus board, from the project README — From the project README

Main components on the Citrus board

BQ24074RGTTPS63000-Q1RP2354A W25Q128JVS

Citrus board bill of materials (BOM)

56 components, 31 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	BQ24074RGT	VQFN-16-1EP_3x3mm_P0.5mm_EP1.6x1.6mm	U1
1	TPS63000-Q1	Texas_DRC0010J_ThermalVias	U2
1	RP2354A	RP2350-QFN-60-1EP_7x7_P0.4mm_EP3.4x3.4mm_ThermalVias	U3
1	W25Q128JVS	SOIC-8_5.3x5.3mm_P1.27mm	U4
1	CRYSTAL_GND24 Crystal_GND24	Crystal_SMD_3225-4Pin_3.2x2.5mm	Y1
1	SHOU_HAN_USB_C_RECEPTACLE_USB2.0_16P SHOU_HAN_USB_C_Receptacle_USB2.0_16P	USB-C-SMD_TYPE-C-6PIN-2MD-073	J1
1	CONN_01X02 Conn_01x02	JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical	J2
1	CONN_01X03_MOUNTINGPIN Conn_01x03_MountingPin	JST_SH_SM03B-SRSS-TB_1x03-1MP_P1.00mm_Horizontal	J3
1	C49260526 0.5mm FPC	CONN-SMD_AFC01-S22FCA-HF	J4
2	SW_Push	SW-SMD_L3.9-W3.0-P4.45	SW1, SW2
1	C2296 ORANGE	LED_0805_2012Metric	D1
1	C2286 RED	LED_0603_1608Metric	D2
1	2.2UH 2.2uH	IND-SMD_L3.9-W3.9	L1
1	3.3UH 3.3uH	IND-SMD_L2.0-W1.6_AOTA-B201610S3R3-101-T	L2
2	15P 15p	C_0402_1005Metric	C1, C2
1	1u	C_0603_1608Metric	C3
4	10U 10u	C_0805_2012Metric	C4, C7, C15, C16
6	4.7U 4.7u	C_0402_1005Metric	C5, C6, C9, C10, C12, C14
11	100N 100n	C_0402_1005Metric	C8, C11, C13, C17, C18, C19, C20, C21 +3
1	1.18K 1.18k	R_0402_1005Metric	R1

Show 11 more

Qty	Part	Footprint	Refs
1	1.13K 1.13k	R_0402_1005Metric	R2
1	50	R_0402_1005Metric	R3
2	5K1 5k1	R_0402_1005Metric	R4, R5
4	10K 10k	R_0402_1005Metric	R6, R12, R15, R17
1	1.5K 1.5k	R_0402_1005Metric	R7
1	100	R_0402_1005Metric	R8
1	100K 100k	R_0402_1005Metric	R9
1	1k	R_0402_1005Metric	R10
1	33R	R_0402_1005Metric	R11
2	27R	R_0402_1005Metric	R13, R14
1	0	R_0805_2012Metric	R16

Citrus board design files

The KiCad project lives in the obobed/citrus-board repository on GitHub; these links point at the commit this page was built from.

Citrus board: common questions

What microcontroller does the Citrus board use?

The Citrus board is built around the RP2354A, from the RP2040/RP2350 family.

How big is the Citrus board?

The Citrus board measures 27 × 60 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Citrus board?

56 components, from 31 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Citrus board design files?

From the obobed/citrus-board repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

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

Yes, under the terms of its GPL-3.0 license, which obobed chose for the repository.

Can I test firmware for the Citrus board without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.