FEDL-7661-01
Issue Date: Oct. 5, 2021
ML7661
13.56MHz wireless charging Tx LSI
1 / 18
1. Overview
ML7661 is a 13.56MHz wireless power transmission device. ML7661 realizes a wireless power supply system by
combining with the power receiving device ML7660, and can output 1W for power transmission.
The ML7661 has a communication command generation function for communicating with the power receiving device
ML7660, an external transistor control function for supplying 1W, a function for variably controlling the transmission
amount to optimize the transmission power, and a function to detect abnormalities when the ML7660 is attached/detached
or power is transmitted. All of these functions are included in the 40-pin WQFN package(6.0 mm square), and the ML7661
is the best LSI for wireless power supply of small devices.In addition, the operating voltage is 5V, and it can be driven
from a USB power source such as a mobile battery.Furthermore, ML7661 is equipped with a host interface (SPI / I
2
C slave)
function and a serial interface (SPI / I
2
C master, UART) function, and it is possible to update configuration data from an
external MCU and control various sensors.
2. Features
⚫ Charging control
― Built-in 13.56MHz power transmission control circuit
1W power transmission transistor control output
― Abnormaly detection by software and hardware control
⚫ NFC communication control
― Equipped with a command generation function for communication with ML7660
― Communication speed: 212kbps, 424kbps
― 2Kbyte data flash for storing user data
⚫ Host interface
― 1ch Serial interface (Slave), and selectable from SPI or I
2
C
― Register function accessible from the host MCU
― Built-in 512byte FIFO
⚫ Serial interface
― 1ch SPI interface(Master)
― 1ch I
2
C interface(Master)
― 1ch UART interface (2-wire, Full-duplex communication mode)
⚫ General Port(PORT)
― Input/Output×13ch
⚫ Successive approximation type A/D converter (SA-ADC)
― Resolution 10bit
⚫ Reset
― Reset by RESET_N port
― Power on reset
― Reset by WDT overflow
FEDL-7661-01
ML7661
2 / 18
⚫ Clock
― Low speed clock
Built-in RC oscillation(32.768kHz)
― High speed clock
Crystal oscillator (27.12MHz)
⚫ Package
― WQFN40pin(P-WQFN40-0606-0.50-63)
⚫ CPU
― 16-bit RISC CPU（CPU：nX-U16/100）
― Built-in On-chip debug function
― Minimum instruction execution time
147.5ns（@6.78MHz system clock）
⚫ Internal memory
― Memory size
Flash*
SRAM
Other RAM
Program：32K byte
Data：2K byte
6K byte（Work RAM）
1K byte(For debugger trace function)
256 byte（For NFC）
512 byte (For Host interface)
*: This product uses SuperFlash® technology licensed from Silicon Storage Technology, Inc.
SuperFlash® is a registered trademark of Silicon Storage Technology, Inc.
⚫ Interrupt controller (INTC)
― 1 non-maskable interrupt source (Internal source: WDT)
― 26 maskable interrupt sources(Internal source: 18, External source: 8）
― Software interrupt(SWI): Max. 64 sources
― Selectable edge and sampling for external interrupt and comparator
― Four step unterrupt levels
⚫ Timer
― 8bit×8ch (16-bit configuration is possible using 2ch)
― Built-in Repeat mode, One shot mode is available
― Timer start/stop function by software
⚫ Watchdog timer(WDT)
― Non-maskable interrupt and Reset
1
st
overflow: generate interrupt, 2
nd
overflow: generate reset or host notification
― Free-run
― Overflow period: 4 selectable(125ms, 500ms, 2s, 8s) at LSCLK=32.768kHz
― Stop function