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Mainboard

sbstnh·programmable_precision_resistor·pcb/mainboard/mainboard.kicad_pcb

Mainboard PCB layout, top view — open source STM32 board by sbstnh

About the Mainboard PCB

Mainboard is an open source STM32 PCB design by sbstnh, published on GitHub under the BSD-3-Clause license. It is a 2-layer board measuring 139 × 190 mm, with 245 components from 53 distinct parts.

Its main chip is the STM32G441KB, from the STM32 family. Other key parts include the USBLC6-2SC6, 74HC14, 24C32 and STP16CP05. By type, the board carries 80 diodes, 72 resistors, 39 relays, 19 capacitors, 15 test points and 7 ICs.

From the project

A SCPI programmable precision resistor

WARNING: The programmable power resistor presented is mains powered. On the power supply board there will be mains/line voltage. Working with/on such devices can lead to damage, injury or death. Don't do it if you're not qualified or authorized to do so. You use the circuits described at you own risk. You have to make sure that the circuit is safe and adheres to the applicable standards in your location. You might operate the mainboard and ui board more safely with a bench or external power supply.

Mainboard, from the project README
From the project README

Main components on the Mainboard

USBLC6-2SC674HC1424C32STM32G441KBSTP16CP05

Mainboard bill of materials (BOM)

245 components, 53 distinct parts.

QtyPartRefs
1
USBLC6-2SC6
U1
1
74HC14
U2
1
24C32
U3
1
STM32G441KB
U4
3
STP16CP05
U5, U6, U7
1
BSS138
Q1
1
TSM3401
Q2
1
16MHz
Y1
1
PWR
J1
1
Conn_01x03_Male
J2
1
USB_B
J3
1
UI
J4
1
Conn_02x03_Odd_Even
J5
1
RES1
J6
39
EC2-12NU
K1, K2, K3, K4, K5, K6, K7, K8 +31
2
JTP1236
SW1, SW2
2
KTY82
TH1, TH2
2
GND
TP1, TP2
1
+15V IN
TP3
1
+3.3V
TP4
Show 33 more
QtyPartRefs
1
EXT_IN1
TP5
1
EXT_IN2
TP6
1
DISP_RESET
TP7
1
SCL
TP8
1
INT_UI
TP9
1
+15V SW
TP10
1
SDA
TP11
1
MOSI
TP12
1
SCK
TP13
1
NSS
TP14
1
~{OE}
TP15
41
BAV99
D1, D2, D19, D20, D21, D22, D23, D24 +33
39
LED
D3, D4, D5, D6, D7, D8, D9, D10 +31
1
100u
C1
1
10u
C2
11
100n
C3, C4, C5, C6, C9, C12, C13, C14 +3
2
27p
C7, C8
1
4.7u
C10
1
dnp
C11
1
10n
C15
1
1u
C16
6
2.2k
R1, R2, R8, R9, R14, R15
4
100k
R3, R4, R6, R7
1
1k
R5
2
10k
R10, R11
2
33
R12, R13
9
2
R16, R17, R18, R19, R20, R21, R22, R23 +1
9
20
R25, R26, R27, R28, R29, R30, R31, R32 +1
9
200
R34, R35, R36, R37, R38, R39, R40, R41 +1
9
2k
R43, R44, R45, R46, R47, R48, R49, R50 +1
9
20k
R52, R53, R54, R55, R56, R57, R58, R59 +1
9
200k
R61, R62, R63, R64, R65, R66, R67, R68 +1
3
1.5k
R70, R71, R72

Mainboard design files

The KiCad project lives in the sbstnh/programmable_precision_resistor repository on GitHub; these links point at the commit this page was built from.

Mainboard: common questions

What microcontroller does the Mainboard use?

The Mainboard is built around the STM32G441KB, from the STM32 family.

How big is the Mainboard PCB?

The Mainboard measures 139 × 190 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Mainboard?

245 components, from 53 distinct parts. The full bill of materials is listed on this page.

Where can I download the Mainboard design files?

From the sbstnh/programmable_precision_resistor repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Mainboard design in my own project?

Yes, under the terms of its BSD-3-Clause license, which sbstnh chose for the repository.

Can I test firmware for the Mainboard without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

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