13.56MHz (NFC) wireless charging chipset supporting up to 1W power supply
" ML7661 / ML7660 "

Wireless charging ML7660 Power transmission(TX)LSI

ML7661

Power transmission (TX) LSI
Wireless charging ML7660 Power receiving(RX)LSI

ML7660

Power receiving (RX) LSI

13.56MHz (NFC) wireless charging chip set
supporting up to 1W power transfer
" ML7661 / ML7660 "13.56MHz (NFC) wireless charging chip set supporting up to 1W power transfer ML7661 / ML7660

Features of ML7660 / ML7661
3 features

Features.1  
13.56MHz wireless charging, capable of supplying a battery with a capacity of 200mAh (at 1C* charge)

By increasing the power supply capacity to 1W (five times that of the conventional product), it is possible to charge wristband blood pressure monitors with large battery capacity, and to charge smartwatches and hearing aids at high speed

Comparison of "charging time to 90% battery capacity" between USB charging and 13.56MHz wireless 1C* charging

Analog video signals can be imported into the latest SoC

Within a battery capacity of 200mAh.
Charging time is almost the same between wireless charging and USB cable charging.

Using the 13.56MHz frequency band, the antenna size can be reduced by 83% compared to Qi (Qi)* (110kHz to 205kHz), a common feeding method used in smartphones.
Or, the antenna size can be reduced by 36% compared to discrete component configurations (several hundred kHz), allowing it to be mounted on smaller devices.

Term Description
  • 1C :
    Current to fully charge a rechargeable battery in one hour
  • Qi:
    An international standard for wireless charging developed by the Wireless Power Consortium. It is used in wireless charging for smartphones.
Use of higher frequencies and smaller antenna size
Features. 2  
Microcomputer-less design contributes to miniaturization by reducing the number of parts

Power supply control can be achieved without a microcontroller by simply supplying power.
This not only eliminates the need for software development for the microcontroller, but also contributes to miniaturization by reducing the mounting space for the microcontroller.
For the addition of a new SPI interface, it enables microcontroller-less control of digital sensors and other devices with SPI interfaces.

Microcomputer-less design contributes to miniaturization by reducing the number of parts
Features.3  
Control and monitor rotating equipment by using both power supply and high-speed data communication.

Communication with sensors mounted on the rotating part and power supply are now possible, which was not possible with the conventional wired system.

Control and monitor rotating equipment while supplying power

Applications

Ultra-small devices with a battery capacity of 200mAh or less,
devices that combine power supply and high-speed data communication

Use of higher frequencies and smaller antenna size

Specifications

“ML7661”
13.56MHz (NFC) power transmission LSI

ML7661 WQFN40

One single chip can contain all the functions necessary for power transmission

  • Wireless charging protocol auto-run
  • Transmitter output level setting
  • Detection of the dropout of the power receiver device
  • Detection of foreign object between power transmitter and receiver
Power transmitter LSI ML7661
Item ML7661
Date Flash 496Byte
Operating Frequency 13.56MHz
Operating Voltage 5V
I/F SPI × 1、I2C × 1、UART × 1
Operating Temperature -40°C to +85°C
Package P-WQFN40-0606-0.50
(6mm × 6mm 0.5mm pitch)

"ML7660"
13.56MHz (NFC) power receiving LSI

ML7660 WQFN32 WLCSP30

Power receiver and Tag function integrated in one chip

  • 1W, wireless charging efficiency 50% Output
  • Wireless charging protocol auto-run
  • Monitoring electric current, voltage, temperature
  • NFC Forum Type3 TAG Function
Charging LSI ML7660
Item ML7660
Date Flash 496Byte
Operating Frequency 13.56MHz
Power Supply Operating temperature
I/F

NFC Forum Type3 Tag v1.0

SPI × 1、I2C × 1、UART × 1

Charging Control Power receiver / rectifier
ADC (Method) 10bit (SA type)
Operating Temperature -40°C to +85°C
Package

WQFN32
(5mm × 5mm 0.5mm pitch)

WLCSP30
(2.28mm × 2.61mm 0.4mm pitch)

Evaluation

LSI sample

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