Multislope-3I

NNNILabs·Multislope-3I·HW/Multislope 3I.kicad_pcb

About the Multislope-3I PCB

Multislope-3I is an open source RP2040/RP2350 PCB design by NNNILabs, published on GitHub under the MIT license. It is a 4-layer board measuring 100 × 74 mm, with 124 components from 49 distinct parts.

Its main chip is the Pico, from the RP2040/RP2350 family. Other key parts include the OPA21xx, LM399, SN74LV4053, OPA1xx and 431. By type, the board carries 50 resistors, 30 capacitors, 19 ICs, 15 connectors, 5 inductors and 3 diodes.

From the project

Improved multislope ADC

Main components on the Multislope-3I

OPA21xx LM399 SN74LV4053 OPA1xx 431 408 LM311 NE5534 OPA197 MCP3202 Pico LM35 ADuM121N HT7533 HT7550

Multislope-3I bill of materials (BOM)

124 components, 49 distinct parts.

Qty	Part	Footprint	Refs
1	OPA21xx	SOIC-8_3.9x4.9mm_P1.27mm	U1
1	LM399	Analog_TO-46-4_ThermalShield	U2
1	SN74LV4053	SOIC-16_3.9x9.9mm_P1.27mm	U3
3	OPA1xx	SOIC-8_3.9x4.9mm_P1.27mm	U4, U5, U6
3	431	SOT-23	U7, U8, U14
1	408	SOIC-16_3.9x9.9mm_P1.27mm	U9
1	LM311	SOIC-8_3.9x4.9mm_P1.27mm	U10
1	NE5534	SOIC-8_3.9x4.9mm_P1.27mm	U11
1	OPA197	SOIC-8_3.9x4.9mm_P1.27mm	U12
1	MCP3202	SOIC-8_3.9x4.9mm_P1.27mm	U15
1	Pico	RPi_Pico_SMD_TH	U16
1	LM35	TO-92	U17
1	ADuM121N	SOIC-8_3.9x4.9mm_P1.27mm	U18
1	HT7533	SOT-89-3	U20
1	HT7550	SOT-89-3	U21
1	INT	PinHeader_1x02_P2.54mm_Vertical	J1
1	TEST	PinHeader_1x07_P2.54mm_Vertical	J2
1	COMP	PinHeader_1x02_P2.54mm_Vertical	J3
4	SLOT	PinHeader_1x01_P2.54mm_Vertical	J4, J5, J6, J9
1	SLOPE2	PinHeader_1x02_P2.54mm_Vertical	J7

Show 29 more

Qty	Part	Footprint	Refs
2	PWR	PinHeader_1x03_P2.54mm_Vertical	J8, J15
1	PWR	PinHeader_1x04_P2.54mm_Vertical	J10
1	TEST	PinHeader_1x03_P2.54mm_Vertical	J11
1	UART	PinHeader_1x04_P2.54mm_Vertical	J12
1	INPUT	PinHeader_1x02_P2.54mm_Vertical	J13
1	SLOPE	PinHeader_1x02_P2.54mm_Vertical	J14
1	REF CASE	Ref Case	N1
1	RST	SW_Push_1P1T_NO_CK_KMR2	SW1
3	4148	D_SOD-323	D1, D2, D3
5	FB	R_0603_1608Metric	FB1, FB2, FB3, FB4, FB5
26	1uf	R_0603_1608Metric	C1, C2, C4, C5, C6, C7, C8, C11 +18
1	100nF	R_0603_1608Metric	C3
1	100pF	R_0603_1608Metric	C9
1	1nF	R_0603_1608Metric	C10
1	1uF	C_0805_2012Metric	C24
3	0R	R_0603_1608Metric	R1, R4, R8
17	10R	R_0603_1608Metric	R2, R3, R9, R10, R11, R12, R13, R14 +9
1	5R1	R_0603_1608Metric	R5
2	3K1	0603 Jumper	R6, R7
1	100R	R_0603_1608Metric	R16
6	10K	R_0603_1608Metric	R17, R21, R22, R23, R24, R36
9	1K	R_0603_1608Metric	R18, R27, R28, R29, R30, R31, R32, R33 +1
4	0R	0603 Jumper	R19, R20, R41, R42
2	100K	R_0603_1608Metric	R34, R43
1	51K	R_0603_1608Metric	R44
1	24K	R_0603_1608Metric	R45
1	5K6	R_0603_1608Metric	R46
1	15K	R_0603_1608Metric	R47
1	10K	SOIC-16_3.9x9.9mm_P1.27mm	RN1

Multislope-3I design files

The KiCad project lives in the NNNILabs/Multislope-3I repository on GitHub; these links point at the commit this page was built from.

LayoutHW/Multislope 3I.kicad_pcb
SchematicHW/Multislope 3I.kicad_sch

Multislope-3I: common questions

What microcontroller does the Multislope-3I use?

The Multislope-3I is built around the Pico, from the RP2040/RP2350 family.

How big is the Multislope-3I PCB?

The Multislope-3I measures 100 × 74 mm, has 4 copper layers and is 4.69 mm thick.

How many components are on the Multislope-3I?

124 components, from 49 distinct parts. The full bill of materials is listed on this page.

Where can I download the Multislope-3I design files?

From the NNNILabs/Multislope-3I repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Multislope-3I design in my own project?

Yes, under the terms of its MIT license, which NNNILabs chose for the repository.

Can I test firmware for the Multislope-3I 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.