Rohm Referencedesigns

REF67011

REF67011 - Reference Design

NFC Telemetry-Based Rotating Component Torque Sensing

In this reference design, a strain sensor and the ML7660-EVK-002 are attached to the shaft. It is now possible to directly measure and collect data on the strain of the rotating shaft, which was previously impossible.

Specifically, the measurement process follows these steps:
1) The power supply LSI wirelessly supplies power to the power receiving LSI.
2) The power receiving LSI supplies power to the strain sensor via a wired connection.
3) The strain sensor measures the strain of the rotating shaft.
4) The strain sensor sends the strain measurement data to the power receiving LSI via a wired connection.
5) The power receiving LSI wirelessly transmits the measurement data to the power supply LSI.

This reference design uses the STREAL SR300 sensor manufactured by Glosel. If you plan to use Glosel sensors, please check directly with Glosel for availability and procurement details in advance.
https://www.glosel.co.jp/en/contact/

Sample Program

ML7661/ML7660 BatteryLess SDK

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ML7661/ML7660 BatteryLess SDK Software Manual

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ML7661/ML7660 BatteryLess SDK Host MCU Sample Software Manual

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Type	Title	Related Board Number	Last Updated
User's Guide	Evaluation Board User's Guide for ML766x-EVK-002	ML7660-EVK-002	2025/02/27
User's Guide	Evaluation Board User's Guide for ML766x-EVK-002	ML7661-EVK-002	2025/02/27

Design Resources

Type	Title	Related Board Number	Last Updated
Schematic	ML7660-EVK-002 Schematics	ML7660-EVK-002	2025/02/27
BOM	ML7660-EVK-002 BOM	ML7660-EVK-002	2025/02/27
Layout (PDF)	ML7660-EVK-002 Board Layout	ML7660-EVK-002	2025/02/27
Layout (CAD Data)	ML766x-EVK-002 Gerber data	ML7660-EVK-002	2025/02/27
Schematic	ML7661-EVK-002 Schematics	ML7661-EVK-002	2025/02/27
BOM	ML7661-EVK-002 BOM	ML7661-EVK-002	2025/02/27
Layout (PDF)	ML7661-EVK-002 Board Layout	ML7661-EVK-002	2025/02/27
Layout (CAD Data)	ML766x-EVK-002 Gerber data	ML7661-EVK-002	2025/02/27

Specifications

Board Number	Input Voltage	IF	Output Power	Sensor	Operating Frequency
ML7660-EVK-002	Generated from magnetic field	SPI (controller/peripheral)	>20mW (@3ms interval, 12Byte)	Torque, Temperature	-
ML7661-EVK-002	5.0V to 5.5V	SPI (peripheral)	-	-	13.56MHz

Distribution Inventory

Board Number	Distributor	Quantity Available

Key Components

Board Number	Product Category	Part Number	Datasheet	Status	SPICE	LTspice®	Thermal Model	Symbol & Footprint	3D STEP	ROHM Solution Simulator
ML7660-EVK-002	Schottky Barrier Diodes	RB061QS-20	-	Recommended	-	-			-	-
ML7660-EVK-002	12 to 150V MOSFETs	QS6M4	-	Active	-	-	-			-
ML7660-EVK-002	12 to 150V MOSFETs	RK7002BM	-	Recommended	-	-	-		-	-
ML7660-EVK-002	Linear Regulators	BU33TD2WNVX	-	Recommended				-		-
ML7661-EVK-002	12 to 150V MOSFETs	RSF014N03	-	Active	-	-	-			-
ML7661-EVK-002	Linear Regulators	BD00GC0WEFJ	-	Recommended				-	-	-

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