RENESAS KR002 Smart Earbuds Case Charger User Guide
- June 6, 2024
- RENESAS
Table of Contents
- Smart Earbuds Case Charger (Update)
- Smart Earbuds Case Charger (Update)
- RL78/G13 Standard Functions MCU
- P9222-R Wireless Power Receiver for Low Power
- ISL9205 Li-Ion Battery Charger
- ISL6146 Low Voltage ORing FET Controller
- ISL9120 High Efficiency Buck Boost
- Read User Manual Online (PDF format)
- Download This Manual (PDF format)
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)
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
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
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
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.
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
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