RENESAS KR002 Smart Earbuds Case Charger User Guide

June 6, 2024
RENESAS

RENESAS KR002 Smart Earbuds Case Charger User Guide

RENESAS KR002 Smart Earbuds Case Charger User Guide

Smart Earbuds Case Charger (Update)

Overview

The smart wireless earbuds market is growing at an impressive rate. According to a report from market researcher, Ariston, the global earbuds market is estimated to reach revenues of around $7 billion by 2023, growing at a CAGR of about 31% during 2018-2023.

Optimized for compact and low-power applications, this design incorporates the P9222-R, an integrated single-chip wireless power receiver IC. It is highly efficient at light loads and very well-suited for applications like earbuds case charging.

System Benefits

-The P9222-R is an ultra-compact, efficient wireless power receiver for up to 5W applications
-The RL78/G13 microcontroller (MCU) provides a low power but flexible control unit
-The ISL9205D is a complete charger for single-cell Li-ion/polymer batteries

Smart Earbuds Case Charger (Update)

RENESAS KR002 Smart Earbuds Case Charger User Guide - Smart Earbuds Case
Charger

RENESAS KR002 Smart Earbuds Case Charger User Guide - Key
Features

RL78/G13 ­ Standard Functions MCU

Low Power and Abundant Line-up for General Purpose Applications

High Performance Peripheral Functions

  • 43.2 DMIPS (32 MHz)
  • On-chip oscillator, data flash, 10-bit A/D converter
  • Built-in safety features enable support for the household appliance safety standard (IEC/UL 60730)

Low Power

  • CPU: 66 A/MHz, standby (STOP): 230 nA
  • 0.57 A (RTC_LVD,HALT mode)

Abundant Line-up

  • 16-512KB ROM / 2-32KB RAM
  • 20-128 pin package

RENESAS KR002 Smart Earbuds Case Charger User Guide - Low Power and Abundant
Lineup for General Purpose Applications

R5F1006/7/8x

RENESAS KR002 Smart Earbuds Case Charger User Guide - BOM Cost Reduction Use
Case

P9222-R ­ Wireless Power Receiver for Low Power

WPC 1.2.4 Compliant, Wireless Charging Receiver for 5W Applications

High Efficiency

  • Ultra-compact, efficient wireless power receiver for up to 5W applications
  • Optimized light load efficiency for low power applications
  • Ping detection for reduced power consumption at end of charging
  • Low under-voltage lockout (UVLO) for low voltage start-up for faster connections over an extended area

Easy and Flexible Use

  • Easy configuration of design parameters through I2C interface on an external EEPROM
  • Embedded 32-bit Arm® Cortex®-M0 processor
  • ADC input to measure battery voltage or system voltage

Low Power and Protection Features

  • Low standby and operating mode power consumption
  • Internal over-voltage clamping
  • High performance low dropout (LDO) regulator with low RDS(on) and programmable current limiting

RENESAS KR002 Smart Earbuds Case Charger User Guide - Low Power and
Protection Features

P9222-RAZG18

RENESAS KR002 Smart Earbuds Case Charger User Guide - WPC 1.2.4 Compliant,
Wireless Charging Receiver for 5W Applications

ISL9205 ­ Li-Ion Battery Charger

Complete Charger for Li-Ion / Polymer Batteries

Single IC Solution for Charging

  • Integrated pass element and current sensor
  • Charge current from 50mA to 900mA

Multiple Charge Modes

  • Adjustable CC & end of charge current via external resistors
  • Ability to operate as pulse charger for current limited inputs
  • Trickle charge for fully discharged batteries

Protection Features

  • Incorporates Thermaguard to prevent over temperature
  • Foldback of charge current during over temperature events
  • Ability to monitor temperature of battery pack

RENESAS KR002 Smart Earbuds Case Charger User Guide - Protection
Features

RENESAS KR002 Smart Earbuds Case Charger User Guide - ISL9205 – Li-Ion
Battery Charger

ISL6146 ­ Low Voltage ORing FET Controller

ORing voltages from 1V to 20V

Device Operation

  • ORing down to 1V and up to 20V
  • VIN hot swap transient protection rating to +24V
  • High speed comparator provides fast <0.3us turn-off in response to shorts on sourcing supply
  • Fastest reverse current fault isolation with 6A turn-off current

Device Options

  • ISL6146A and ISL6146B are optimized for very low voltage operation
  • ISL6146C provides a voltage compliant mode of operation down to 3V with programmable under voltage lock out and overvoltage protection threshold levels.
  • ISL6146D and E are like the A & B respectively, but do not have conduction state reporting via the fault output.

RENESAS KR002 Smart Earbuds Case Charger User Guide - Device
Options

ISL6146AFUZ-T

RENESAS KR002 Smart Earbuds Case Charger User Guide - ISL6146 – Low Voltage
ORing FET Controller

ISL9120 ­ High Efficiency Buck Boost

Integrated Buck-Boost for Single Cell Applications

Integrated Buck Boost

  • 1.8V to 5.5V Input range
  • Output current up to 800mA
  • Efficiency up to 98%

Compact Design

  • Default output of 3.3V, adjustable via resistors
  • Integrated FETs for efficiency and space savings

High Performance

  • 41uA quiescent current for light load efficiency
  • Seamless transitions between buck/boost modes
  • Forced bypass mode, utilizes only 3.5uA Iq
  • Adaptive multilevel current limit scheme

RENESAS KR002 Smart Earbuds Case Charger User Guide - High
Performance

ISL9120IRTAZ 

RENESAS KR002 Smart Earbuds Case Charger User Guide - ISL9120 – High
Efficiency Buck Boost

Renesas.com/win
© 2020 Renesas Electronics Corporation. All rights reserved.RENESAS
Logo

Read User Manual Online (PDF format)

Read User Manual Online (PDF format)  >>

Download This Manual (PDF format)

Download this manual  >>

Related Manuals