AISPEECH Primary Agent AI Offline Voice IC YT2228
- Model：
- YT2228
- Brand：
- AISPEECH
- Batch No：
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- Desc：
- YT2228 is a highly integrated offline voice recognition SoC launched by AISPEECH. It integrates a 32-bit 240MHz processor, 2MB on-board Flash, Bluetooth 5.3, dual-channel DAC and single-microphone wake-up function. GSMICRO supplies genuine in-stock ICs, c
- Stock：
- 50000 只
AISPEECH YT2228 AI Offline Voice Control Chip: Highly Integrated Bluetooth 5.3 + 240MHz Floating-Point DSP, Offline Voice Solution for Personal Care Massagers & Smart Home
Keywords:YT2228 | AISPEECH Offline AI Voice SOC | Bluetooth 5.3 Voice Chip | Single-Mic Offline Speech Recognition | Voiceprint AI Learning Recognition | SSOP28 Package | Voice Chip for Eye Massager | Offline Voice Solution for Warm Palace Belt | Hands-Free Voice Control for Shoulder & Waist Massager | Smart Home Offline Voice Control Panel | smartic‑ai | DeepThink Voice Chip
Product Overview:YT2228 is a high-performance "Chip + Algorithm" AI offline voice interaction SOC launched by AISPEECH. It integrates a 32-bit floating-point DSP (240MHz), 2MB Flash and 192KB RAM, supports Bluetooth 5.3 BR/EDR/BLE, built-in 2-channel DAC (SNR 95dB) and 3-channel ADC (SNR 90dB). It supports single-mic offline recognition and voiceprint AI learning recognition with 5-meter far-field interaction. Voice control can be realized without network access to get rid of remote controllers. Target applications cover personal care massagers: warm palace belts, eye massagers, shoulder massagers and waist massagers. It is also compatible with smart home offline voice AI control panels, offline voice alarm clocks, kitchen timers and other devices. Voice commands can start/stop devices, adjust gears, set temperature and timing switches.
⚡ Core Specifications Summary
✔ YT2228 Core Advantages (For Personal Care Massagers & Smart Home Offline Voice)
① AISPEECH Native Offline AI Voice – Local offline algorithm from AISPEECH, supports voiceprint AI learning recognition. Up to 150 local configurable command words, multi-turn interaction and fast response, No Internet Required. Ideal for massager gear switching, temperature adjustment and timing control, eliminating remote controllers and physical buttons.
② Large Memory + High Clock + Professional DSP – Built-in 2MB Flash + 192KB RAM, 240MHz DSP supports floating-point calculation. Integrated single analog MIC environmental noise cancellation (ENC), multi-band DRC compressor and 30-band EQ configuration. Sufficient space reserved for voice models and voiceprint database (approx 1350~1400KB free Flash for secondary development with 50 command words).
③ Full-Featured Bluetooth 5.3 – Supports A2DP/AVRCP/HFP/SPP/HID, transmit power +6dBm, sensitivity -90dBm for Bluetooth audio playback. Personal care devices and smart home panels can integrate voice control and audio playback in one chip.
④ Rich Peripherals for Temperature & Motor Control – Full-speed USB 2.0 OTG, 3×UART, 2×SPI, IIC, Capacitive Touch, 10-bit ADC; Equipped with four 16-bit timers and three motor PWM generators to directly drive heating modules, vibration motors and LED indicators.
⑤ Low Power + Built-in Charger, Perfect for Li-ion Battery Devices – Standby current ~10mA, wake-up & recognition ~20mA; Deep sleep software shutdown mode as low as 3µA. Built-in programmable linear charger (20~320mA). Perfect for rechargeable portable personal care products including eye/shoulder/waist massagers and warm palace belts.
⑥ Industrial Reliability – Operating temperature -40~85℃, wide VBAT voltage 2.2V~5.5V. Designed for industrial control with stable service life over 10 years, suitable for long-term operation of massage equipment and smart home offline voice panels.
YT2228 Internal Functional Block Diagram
240MHz
2×DAC / 3×ADC
ENC Noise Reduction / 30-Band EQ
LDO, Charging Management
*Built-in MIC bias. DAC supports output-capacitor-less mode (single-ended / differential), driving 16Ω/32Ω speakers; 2-channel PDM digital MIC input supported for multi-mic audio capture.
Detailed Electrical & Performance Specifications
| Category | Specification | Test Condition / Remarks |
|---|---|---|
| Supply Voltage | VBAT 2.2V ~ 5.5V | VDDIO 2.2~3.6V; Charging Input 4.5~6.5V, Compatible with 3.7V Li-ion Battery |
| DAC Performance | 2-CH 16-bit, SNR ≥95dB, THD+N -75dB | 1KHz/0dB, 10KΩ Load, Clear Voice Prompt |
| ADC Performance | 3-CH 16-bit, SNR ≥90dB, Dynamic Range 80dB | Analog MIC & 2-CH PDM Digital MIC Supported, Sampling Rate 8K~48K |
| Bluetooth Standard | V5.3 + BR/EDR/BLE, Max +6dBm, Sensitivity -90dBm | A2DP/AVRCP/HFP/SPP/HID Supported |
| GPIO Drive Strength | Typical 5mA, PA Pins up to 20-24mA | PB5(LDOIN) Tolerates High Voltage, Used as Charging Input or HV GPIO |
| Charging Current | 20mA~320mA Programmable | LDOIN/PB5 as Charging Port, Direct Li-ion Charging |
| AI Voice Feature | Single-Mic Offline Recognition, Voiceprint AI Learning Supported | AEC (Acoustic Echo Cancellation) Not Supported, Optimized for Near-Field Interaction |
| Sleep Power Consumption | As Low As 3µA under Software Shutdown | Standby ~10mA, Wake-up/Recognition ~20mA, Bluetooth Call ~30mA |
Pin Assignment (SSOP28)
| Pin# | Name | I/O Type | Main Function |
|---|---|---|---|
| 1 | PB11/DACR | I/O/AO | DAC Right Channel / GPIO, Default Amplifier Control Pin |
| 5~10 | LDOIN/PB5, PB3, PB8, PB9, PB10 | I/O/P | LDOIN(PB5): Charging Input / HV GPIO / Logo Print Pin; Others: General GPIO/UART/SPI |
| 18~19 | USBDM / USBDP | I/O | Full-Speed USB 2.0 OTG Differential Pair, Forced Download Supported |
| 20~24 | PA4 ~ PA0 | I/O/AI | PA0/PA1 Default Application UART; CapSense Touch, ADC, PWM Motor Control |
| 25~26 | PC7 / PC6 | I/O / AI | PC7: MIC_BIAS Output; PC6: Analog MIC ADC Input |
| 27~28 | AVSS / DACL | G / AO | Analog Ground / DAC Left Channel Output (Default Audio Output) |
※ Hardware Design Note: Recommended peripheral circuit for PC6/PC7, AGND and GND single-point connection to Pin27 HP VSS. PC7, PC6, LDOIN/PB5, PB11 are not recommended as general-purpose GPIO.
Package Dimension (SSOP28 / QSOP28)
• Body Width: 5.3mm (Typical) • Body Length: 9.9mm
• Pin Pitch: 0.635mm • Max Height: 1.75mm
• Package Code: SSOP28‑150mil / QSOP28
(Dimensions comply with JEDEC standard, compact PCB layout for small personal care and smart home panels)
Typical Application Circuit & Single-Mic Offline Voice Solution (Personal Care Appliances & Smart Home)
YT2228 Single-Mic Offline Voice Reference Design – Low BOM count, fast implementation of offline voiceprint recognition + voice control + Bluetooth audio; Suitable for warm palace belts, eye/shoulder/waist massagers and smart home offline voice AI panels.
Key Connection Notes (Based on AISPEECH HW Application Notes):
▪ Power & Charging: VBAT connects to Li-ion battery (3.7~4.2V) or DC 5V; LDOIN/PB5 is charging input (4.5~6.5V), charges VBAT internally, can also be configured as high-voltage GPIO or logo pin.
▪ Crystal: 24MHz crystal at XOSCI/XOSCO, ≤20ppm accuracy required for Bluetooth function, 50ppm acceptable for non-Bluetooth use.
▪ Microphone: PC7 for MIC Bias, PC6 for Mic ADC input. AGND and GND single-point connection to Pin27 HP VSS is required.
▪ Audio Output: DACL/DACR feed to audio amplifier (e.g. LTK8002D), capacitor-less output supported. PB11 is amplifier control by default in SDK, DACR set high-impedance.
▪ Antenna: BT_RF pin with π matching network and antenna, 50Ω impedance control required.
▪ Peripheral Control: GPIO/PWM drives heating film, vibration motor, NTC temperature sensor and relay for temperature, gear and on/off control.
| Device | Part | Qty |
|---|---|---|
| YT2228 | SSOP28 | 1 |
| Crystal | 24MHz ±20ppm (Bluetooth Version) | 1 |
| Audio Amp | LTK8002D / NS4150 / CS8121S | 1 |
| Microphone | Analog Electret / Silicon Mic | 1 |
| Speaker | 4Ω~16Ω / 2W~5W | 1 |
| Resistor & Capacitor | Standard 0402/0603 | Several |
Design Tip:YT2228 only supports single-mic solution without AEC. Recommended for quiet near-field scenarios such as massagers, warm palace belts and smart home offline voice panels. Remaining 13 GPIO available for PWM motor drive, heating control and NTC temperature sensing. Firmware download supports USB forced programming, 1-to-2 bare die programming and 1-to-8 board programming for mass production.
Target Applications (Offline AI Voice for Personal Care & Smart Home)
· Offline Voice Warm Palace Belt · Eye Massager · Shoulder Massager · Waist Massager · Offline Voice Massage Chair
✅ Smart Home Offline Voice (No Cloud):
· Smart home offline voice AI control panel, local voice control for lighting and relay peripherals
✅ Companion Consumer Products:
· Offline Smart Voice Alarm Clock, Offline Smart Voice Kitchen Timer
✅ Other Compatible Appliances:
Smart AC Companion / Bathroom Heater / Heating Table, Smart Range Hood, Fan, Water Dispenser, Air Purifier, Smart Lamp, Water Heater, Offline Voice Remote, Bluetooth Voice Education Device, Smart Toy.
Feature Highlights:5-meter far-field single-mic interaction, ENC ambient noise cancellation, customizable wake-up words / local command words, voiceprint AI learning recognition. Example commands: "Xiao Si Xiao Si, turn on heat", "increase temperature", "start massage", "set timer for 10 minutes".
Development Support & Implementation
✅ Complete SDK and voice model training tools provided, customizable wake-up words, up to 150 local offline command words, voiceprint AI model configuration supported.
✅ Hardware reference design, schematic and PCB layout guide available upon request from GSMICRO (including AGND & GND single-point grounding specification).
✅ UART/GPIO control for external devices, PWM speed & temperature adjustment, CapSense touch extension, SPI/IIC for external NTC sensor.
✅ Mass production programming tools (USB forced, 1-to-2, 1-to-8) and documents ready for bare die and PCBA batch programming.
✅ Bluetooth OTA for command words will be available after future firmware release.
Drop-In Alternative & Competitive Comparison
| Item | YT2228 (AISPEECH) | CI1102 (Chipintelli) | JL AC695N | smartic‑ai SC200 | DeepThink IC112 |
|---|---|---|---|---|---|
| Processor | 32-bit DSP+FPU 240MHz | 32-bit CPU 160MHz | 32-bit DSP 240MHz | 32-bit DSP | 32-bit RISC-V |
| On-Chip Memory | 2MB Flash+192KB RAM | External SPI Flash | External Flash | External Flash | External Flash |
| Bluetooth | V5.3 BR/EDR/BLE | No Bluetooth | BLE5.2 | BLE5.0 | No Bluetooth |
| DAC SNR | ≥95dB | ~90dB | ~94dB | ~92dB | ~91dB |
| Charger | Built-in 20~320mA | No | No | No | No |
| AI Function | Offline Recognition + Voiceprint AI Learning | Offline Recognition | Basic Voice | Offline Recognition | Offline Recognition |
| Available GPIO | 13pcs for Heating, Motor & Temp Control | ~8~10pcs | ~12pcs | ~11pcs | ~9pcs |
| Package / Power | SSOP28, Standby 10mA | QFN32, Higher Power | QFN24, ~10mA | QFN32 | QFN40 |
GSMICRO Recommendation for YT2228:Optimized for eye massagers, shoulder & waist massagers, warm palace belts and smart home offline voice AI panels. YT2228 integrates 2MB large Flash and 192KB RAM without external memory, lowering BOM cost and PCB footprint. Integrated Bluetooth 5.3 and Li-ion charging management support local offline recognition and voiceprint AI learning. No cloud connection required to remove remote controllers. Abundant GPIO directly drives heating elements, vibration motors and relays. It is the preferred SOC for offline voice upgrade of personal care appliances and smart home devices.
FAQ (YT2228)
Q1: Does YT2228 support external Flash? Can it boot from external Flash?
A: External Flash is supported for storage expansion, but booting from external Flash is not available. The system always boots from internal 2MB Flash.
Q2: How many GPIO are available for secondary development besides voice and voiceprint functions?
A: Up to 13 GPIO available on YT2228. Important Note: PC7, PC6, LDOIN/PB5, PB11 are not recommended as general GPIO. Remaining resources can be used for massager vibration motor, heating film, temperature sensor, keys, LED indicator and smart home relay control.
Q3: What is the operating current and deep sleep current?
A: Standby ~10mA, wake-up & recognition ~20mA, Bluetooth music ~20mA, Bluetooth call ~30mA. Deep sleep current (software shutdown) as low as 3µA, ideal for battery-powered portable personal care devices.
Q4: Is AEC (Acoustic Echo Cancellation) supported?
A: YT2228 only supports single-mic solution without AEC. Recognition performance will be degraded when playing audio locally. Recommended for quiet near-field scenarios including warm palace belts, massagers and smart home offline voice panels.
Q5: Can offline command words and voiceprint models be upgraded via Bluetooth OTA?
A: Not supported for now. Bluetooth OTA will be available after future firmware release. Firmware and command words are updated by USB or dedicated programmer currently.
Q6: Does this chip support other language models?
A: Only Chinese is supported at present. English and other language versions will be planned according to market demand.
Q7: What programming methods are available? Is special programmer required?
A: Three programming methods, dedicated tools required: ① USB forced download (for development, USB Updater); ② 1-to-2 bare die programming (mass production chips); ③ 1-to-8 board programming (mass production PCBA). GSMICRO provides corresponding tools and documents.
Q8: What is the difference between YT2228 and YT2216?
A: YT2228 is SSOP28 package with more GPIO (13 free), 2MB Flash+192KB RAM; YT2216 is SOP16 for ultra-simple applications. Software incompatibility. YT2228 is preferred for massager and smart home offline voice projects.
Q9: What advantages does YT2228 have over smartic‑ai SC200 and DeepThink IC112?
A: YT2228 has integrated 2MB Flash without external memory, built-in Bluetooth 5.3 and Li-ion charger, native voiceprint AI learning, richer GPIO resources and simpler BOM, best fit for Li-ion-powered personal care massager and smart home offline voice projects.
Q10: How much free Flash space is left after voice firmware deployment?
A: With 50 offline command words configured, approx 1350~1400KB free space in YT2228 internal 2MB Flash for customer data storage.
Q11: Does YT2228 support FM radio?
A: No, YT2228 has no FM transceiver system.
Q12: What microphone types are compatible?
A: Analog audio input, compatible with electret mics and analog silicon mics.
Ordering Information
Partner & Technical Support — GSMICRO (Shenzhen) Semiconductor Co., Ltd.
GSMICRO (Shenzhen) Semiconductor Co., Ltd., established in 2023, originated from LUMENCHIP founded in 2010 and headquartered in Shenzhen. We focus on mixed-signal IC product development and promotion to drive intelligent green technology as an analog IC integrated service brand.
GSMICRO combines global channels and business models, breaking traditional independent distribution patterns. Distribution lines and self-owned brands coexist. Guided by customer demands, we provide customized innovative products and services worldwide. Our authorized partners include DONGWOON, CR MICRO, CRHJ, APM, COOLSEMI, ANHI, Reasunos, OCX, MassChip, XLSEMI, Hichips, NSIWAY, EGmicro, Ruimeng, ChipWays, AISPEECH, Aerosemi and more.
GSMICRO supplies full product lines of MCU, power management IC, AI voice chip, signal chain IC and power devices, covering offline wake-up, speech recognition, voiceprint learning, speech synthesis and intelligent dialogue.
Brand Notice:GSMICRO is an independent entity, separate from SGMICRO (SG Micro Corp.), no shareholding or business affiliation. AISPEECH is the original manufacturer of YT2228.
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