AX05B I Meas

Top	Bottom

Features

Leafony AX05B I Meas is a leaf for measuring current on the V33 and VBUS lines of the Leafony Bus. It separates each power line into IN and OUT so an external current measurement instrument, such as the Nordic Power Profiler Kit II (PPK2), can be inserted in series.

• Supports current measurement on the Leafony Bus V33 and VBUS lines
• Provides 2.54 mm pitch right-angle pin headers for both V33 and VBUS
• Power lines that are not being measured can be shorted with jumpers for normal use

Specification

Item	Description
Dimension	W20×D20mm
Board thickness	0.8mm
Layer	2 layers
Surface finish	ENIG (Immersion gold)
Bus connector	Leafony Bus (F29/B29)
Measurement connector	1×4, 2.54 mm pitch, right-angle pin header ×2

Measurement connector

J1 is for V33, and J2 is for VBUS. Both connectors use the same pin assignment.

Pin	J1 (V33)	J2 (VBUS)	Use
1	GND	GND	Measurement instrument GND
2	V33OUT	VBUSOUT	Output side after measurement
3	V33IN	VBUSIN	Input side before measurement
4	GND	GND	Measurement instrument GND

Current measurement with Nordic Power Profiler Kit II

Use the PPK2 as an ammeter and connect it in series between IN and OUT on the power line to be measured.

• To measure V33: connect the PPK2 between V33IN and V33OUT on J1.
• To measure VBUS: connect the PPK2 between VBUSIN and VBUSOUT on J2.
• If a GND reference is required, connect the GND pin on the same connector to the PPK2 GND.

Short IN and OUT with a jumper on power lines that are not being measured. For example, short pins 2-3 on J1 when V33 is not being measured, and short pins 2-3 on J2 when VBUS is not being measured. For normal use without measuring either line, short pins 2-3 on both J1 and J2.

Documents

• GitHub repository
• KiCad project
• Schematic (PDF)
• PCB layout (PDF)
• Schematic (KiCad)
• PCB layout (KiCad)
• Panelized manufacturing data

Revision history

• June 2026: First edition