Low Energy, Low Cost SoCs

9528 BT 5.2 Dual Mode Audio SoC

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The 9528 combines the features and functions needed for high quality wireless audio into a single SoC. The 9518 supports standards and industrial alliance specifications including Bluetooth 5.2 including BDR/EDR, LE, indoor positioning and BLE Mesh, Zigbee 3.0, HomeKit, 6LoWPAN, Thread and 2.4GHz proprietary standard. The 9518 is designed to offer high integration, ultra-low power application capabilities. The 9518 integrates a powerful 32-bit RISC-V (RISC-Five) MCU, DSP, AI Engine, 2.4GHz ISM Radio, 256kB SRAM, 4MB Flash, stereo Audio Codec, 14bit Aux ADC, Analog and Digital Microphone input, PWM, flexible IO interfaces, and other peripheral blocks required for advanced audio applications. The 9518 also includes multi-stage power management design with sub-threshold level power consumption allowing ultra-low power operation and making it the ideal candidate for wearable and power-constraint applications. With the high integration level of 9518, few external components are needed to satisfy customers’ ultra-low cost requirements.    

Key features:

  • 32-bit RISC-V microcontroller
      Better power-balanced performance than ARM M4
      Instruction and Data cache controller
      Maximum running speed up to 96MHz
  • Memory architecture: up to 4MB Flash, 256kB SRAM including up to 64kB retention SRAM
  • Embedded AI Engine for audio processing
  • RTC and other timers:
      Clock source of a 24MHz&32.768kHz Crystal and 32kHz/24MHz embedded RC oscillator
      Three general 32-bit timers with four selectable modes in active mode
      Watchdog timer
      A low-frequency 32kHz timer available in low power mode
  • Interfaces:
      Up to 44 GPIOs
      2-wire JTAG interface
      Flash I/F interface
      Dual DMIC (Digital Mic), Dual AMIC (Analog Mic), 24bit 192kHz I2S
      Stereo Audio Codec
      SPI, I2C, USB 2.0, Swire, UART with hardware flow control and 7816 protocol support
      Up to 6 channels of differential PWM
      IR transmitter with DMA
      One quadrature decoder (QDEC), two-phase input selectable
      10-channel (only GPIO input), 14-bit Auxiliary ADC
      Low power comparator
  • Embedded hardware AES and AES-CCM
  • Embedded Random Number Generator (TRNG)
  • Embedded hardware acceleration for Elliptical curve cryptography (ECC)
  • RF Features:
      Bluetooth/802.15.4/2.4GHz RF transceiver in worldwide 2.4GHz ISM band
      Bluetooth 5.2 Compliant, BLE 1Mbps and 2Mbps, Long Range 125kbps and 500kbps, BDR (Basic data rate), EDR (Enhanced data rate) 2Mbps and 3Mbps
      IEEE802.15.4 compliant, 250kbps
      2.4GHz proprietary 1Mbps/2Mbps/250kbps/500kbps mode with Adaptive Frequency Hopping feature
      ANT mode
      Rx Sensitivity: -96dBm@BLE 1Mbps, -93dBm@EDR 2Mbps mode, -100dBm@ IEEE802.15.4 250kbps
      Tx output power: up to +10dBm @ BLE/BDR mode, +7dBm @ EDR mode
      50 Ω matched single-pin antenna input
      RSSI monitoring with +/-1dB resolution
      Auto acknowledgement, retransmission and flow control
      Support full-function BLE location features
      Support PTA (Packet Traffic Arbitration) for Wi-Fi co-existence
  • Power Management
      Power supply -VDD (battery): 1.8V~4.3V, VBUS (USB): 4.5V~5.5V
      Low power controller by sub-threshold level power consumption Battery monitor for low battery voltage detection
      Brownout detection/shutoff and Power-On-Reset
      Multiple-power-state to optimize power consumption
      Supports USB BC1.2 Battery Charging
  • Low power consumption:
      Whole Chip, RX EDR mode: 5.23mA @ 4.2V DCDC
      Whole Chip, TX BR mode: 5.34mA @ 0dBm, 4.2V DCDC
      Whole Chip, TX EDR mode: 8.01mA @ 2.5dBm, 4.2V DCDC
      Deep sleep with external wakeup (without SRAM retention): 0.4uA
      Deep sleep with SRAM retention: < 1uA
      Sub-threshold level power consumption for best energy efficiency
  • Bluetooth features Include:
      Bluetooth support with BDR, EDR, and BLE 5.2
      Long range support with 125kbps and 500kbps data rate
      Bluetooth SIG Mesh support
      Bluetooth ISO channel support (a.k.a Bluetooth 5.2) with broadcast and unicast mode
      extended profile with audio support for voice command based searches
  • Wireless Audio features
      High performance Stereo Audio Codec with SNR over 96dB and sampling rate up to 96kHz
      24-bit ADC/DAC for Codec
      Patented WA2+ technology for true wireless stereo and 1+N hearable devices with synchronized playback and balanced power on all devices
      Support decoder for SBC, AAC, OPUS, LC3
      Support voice codec such as G.711, A-Law, u-Law, CVSD, mSBC
      Support HFP 1.7, HSP 1.2, A2DP 1.3, AVRCP 1.6, SPP 1.2, and PBAP 1.0, ANCS, DIS
      Support Apple iAP2
      Support EDR+BLE dual mode operation
      Support noise suppression and echo cancellation
      Support Packet Loss Concealment (PLC) for voice processing
  • Operating temperature range: -40℃~+85℃
  • Package Options: Completely RoHS-compliant package
      T8259F1KET56, 56-pin QFN 7×7mm
      T8259F1KET48, 48-pin QFN 7×7mm
      T8259F1KET32, 32-pin QFN 5×5mm


  • Wireless Headsets
  • Wireless Speakers
  • Hearables
  • Consumer Electronics
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