I91535AQI is an audio system-on-chip (SoC) integrated with high-quality audio features and microcontroller in single chip. I91535AQI can run up to 49 MHz with embedded ARM®Cortex®-M0 32-bit microcontroller core and 64K-byte flash memory which has additional 6KB boot loader flash and 20KB SRAM. The audio features include microphone input ADC and stereo DAC with headphone ouput driver.I91535AQI also comes with a wide variety of peripherals, such as Timers, Watchdog Timer (WDT), Peripheral Direct Memory Access (PDMA), Serial interfaces (UART, SPI, I2C and I2S), USB, PWM modulators, GPIO, SDADC, SARADC, DAC and Low Voltage Detector.I91535AQI supports a rich set of power saving modes including Deep Power Down (DPD) mode drawing less than 2uA. A micro-power 10KHz oscillator enables the device to periodically wake up from deep power down to check other events.Target Applications:•USB headsets•Gaming controllers•USB/I2S audio bridge•Voice communication systemsKey Features:•Core -ARM® Cortex®-M0 processor running up to 49MHz   •Memories -64KB Flash -20KB SRAM -6 KB Flash for user program loader (LDROM) -ISP (In-System Programming) -ICP (In-Circuit Programming)   •Clocks -Internal 49MHz trimmable high speed RC oscillator (HIRC) -Internal 10KHz low speed RC oscillator (LIRC) -External 4~24MHz crystal input (HXT)  •Timers -3x 16-bit timer  • PWMs -8x 16-bit PWM or 4x complementary paired PWM   •Communication Interfaces -2x UART -2x SPI -2x I²C   •Audio Interfaces - 16-bit Sigma-Delta ADC with configurable decimation filter -Analog MIC input -1x I²S   •GPIOs -Three I/O modes: Input with pull-up option / Push-Pull output / Open-Drain output -Maximal 50 GPIOs   •Peripherals -Multi-Function Timers, WDT -PDMA -Built-in Low Dropout Regulator (LDO) -12-bit SAR ADC with 200K SPS   •Operating Characteristics -Wide voltage range: 1.7V ~ 3.6V -Temperature range: -40°C ~ 85°C   •Package -QFN-48 (5x5mm)