HardLabs

Mikoto

zhiayang·mikoto

Mikoto PCB layout, top view — open source Nordic nRF board by zhiayang
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About the Mikoto PCB

Mikoto is an open source Nordic nRF PCB design by zhiayang, published on GitHub under the Apache-2.0 license. It is a 4-layer board measuring 18 × 33.3 mm, with 53 components from 34 distinct parts.

Its main chip is the C1851953, from the Nordic nRF family. Other key parts include the C15464, C86534, mikoto-pins, ESDR0502NMUTAG and MAX17048. By type, the board carries 26 capacitors, 9 resistors, 6 ICs, 4 inductors, 3 diodes and 2 crystals.

It belongs with the iot & wireless, keyboards and power & battery designs in this gallery.

From the project

Bluetooth LE nRF52840 microcontroller in a pro-micro footprint.

nRF52840 microcontroller, in a pro-micro footprint, inspired by the nRFMicro and nice!nano.

See the changelog for the revision history (and compatibility)

1. VDDH power path (5V USB power, and/or 3.7V Li-ion battery) 2. software controllable battery charge current (off, ~100mA, ~250mA, ~350mA) 3. ESD protection on USB lines, and 500mA fuse protection for VBUS and EXT5V 4. "Bidirectional" power over EXT5V

Mikoto, from the project README
From the project README

Main components on the Mikoto

C1851953C15464C86534mikoto-pinsESDR0502NMUTAGMAX17048

Mikoto bill of materials (BOM)

53 components, 34 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
C1851953
nRF52840
U1
1
C15464
BQ24075RGT
U2
1
C86534
XC6220B331MR
U3
1
mikoto-pins
U4
1
ESDR0502NMUTAG
U5
1
MAX17048
U6
1
C255896
32MHz
Y1
1
C93231
32.768 kHz
Y2
1
USB_C_RECEPTACLE_USB2.0
USB_C_Receptacle_USB2.0
J1
1
C206938
500mA hold
F1
1
NetTie_2
NT1
1
C72041
BLUE
D1
1
C72038
ORANGE
D3
1
C50704
PMEG4010CEJ
D5
1
C14033
3.9nH
L1
1
C27143
15nH
L2
2
C1035
10uH
L3, L4
7
C23733
4.7uF
C1, C13, C14, C20, C24, C25, C26
4
C1525
100nF
C2, C3, C4, C10
2
C1550
1pF
C5, C9
Show 14 more
QtyPartRefs
4
C1548
15pF
C6, C7, C17, C18
3
C52923
1uF
C8, C15, C23
1
C1546
100pF
C11
1
C1523
1nF
C12
1
C26403
47nF
C16
1
C15195
100nF
C19
1
C19702
10uF
C21
1
C1552
1.5pF
C22
1
C51721
3.9k
R1
1
C138014
2M
R2
1
C25867
1.5k
R5
3
C25744
10k
R6, R7, R8
2
C25905
5.1k
R9, R10
1
C17168
0R
R11

Mikoto design files

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

Mikoto: common questions

What microcontroller does the Mikoto use?

The Mikoto is built around the C1851953, from the Nordic nRF family.

How big is the Mikoto PCB?

The Mikoto measures 18 × 33.3 mm, has 4 copper layers and is 1.59 mm thick.

How many components are on the Mikoto?

53 components, from 34 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 Mikoto design files?

From the zhiayang/mikoto 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 Mikoto design in my own project?

Yes, under the terms of its Apache-2.0 license, which zhiayang chose for the repository.

Can I test firmware for the Mikoto without the hardware?

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

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