AISPEECH Primary Agent AI Offline Voice IC YT2228
- Model：
- YT2228
- Brand：
- AISPEECH
- Batch No：
- YT2228,离线语音识别芯片,蓝牙V5.3 SOC,低功耗AI语音,智能家电语音方案,思必驰算法芯片,思必驰授权代理商
- 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 Offline AI Voice Control Chip: Highly Integrated Bluetooth 5.3 + 240MHz Floating-Point DSP for Smart Home Appliances
Keywords:YT2228 | Offline AI Voice SoC | Bluetooth 5.3 Chip | Voice Recognition IC | Offline Command Word Chip | AISPEECH Voice Algorithm | Single-Mic Voice Solution | SSOP28 Package
Product Overview:YT2228 is a high-performance "Chip + Algorithm" AI voice interaction solution launched by AISPEECH. It integrates a 32-bit floating-point DSP running at 240MHz, 2MB Flash and 192KB RAM, supports Bluetooth 5.3 BR/EDR/BLE, and embeds dual-channel DAC (SNR 95dB) and single-channel ADC (SNR 90dB). It delivers single-mic offline voice recognition with 5-meter far-field pickup for household scenarios, ideal for air conditioner controllers, range hoods, electric fans, water dispensers and a wide range of smart home appliances.
⚡ Core Parameter Summary
✔ YT2228 Core Advantages
① Deeply Integrated AI Voice Engine – Native offline AISPEECH algorithm, supports up to 100 local command words, multi-turn voice interaction, fast response without internet connection.
② Large Storage & High Clock Frequency – Onboard 2MB Flash + 192KB RAM, 240MHz DSP reserves sufficient space for complex voice models and user application codes (approx. 1350~1400KB usable Flash).
③ Full-Function Bluetooth 5.3 – Supports A2DP/AVRCP/HFP/SPP profiles, +6dBm max transmit power, stable Bluetooth calling & audio playback.
④ Rich Peripheral Expansion – USB1.1, 2×SPI, 3×UART, IIC, PWM Motor Driver, Capacitive Touch Sensor, 10-bit ADC, with 13 spare GPIOs for custom development.
⑤ Low Power Consumption & Built-in Charger – Standby current ~10mA, voice recognition active ~20mA, deep sleep mode supports direct lithium battery connection, integrated linear charger with programmable charging current 20~320mA.
⑥ Industrial-Grade Reliability – Operating temperature range -40~85℃, design lifespan over 10 years, suitable for long-running smart home appliances.
YT2228 Internal Functional Block Diagram
240MHz
2×DAC / 1×ADC
LDO, Battery Charge Management
*On-chip MIC bias generator; DAC supports capacitorless output mode (single-ended / differential), directly drives 16Ω speaker with 20mW output power.
Detailed Electrical & Performance Specifications
| Category | Specifications | Test Conditions / Remarks |
|---|---|---|
| Supply Voltage | VBAT 3.0V ~ 5.5V | LDO_IN charging input voltage 4.5~5.5V |
| DAC Performance | SNR 95dB, THD+N -75dB | 1KHz/0dB, 10KΩ Load |
| ADC Performance | SNR 90dB, Dynamic Range 80dB | Sampling Frequency Fs=44.1kHz |
| Bluetooth Transmit Power | Max +6dBm | Class1/2/3 Transmit Power Supported |
| GPIO Drive Capacity | Normal 5mA, High-Drive 24mA | PB5 pin supports 5V Tolerance |
| Charging Current | 20mA~320mA Programmable | Fast Charging Mode |
| Operating / Storage Temperature | -40℃~+85℃ / -65℃~+150℃ | Industrial Grade |
Chip Pin Definition (SSOP28)
| Pin# | Pin Name | I/O Type | Primary Function |
|---|---|---|---|
| 1 | PB11/DACR | I/O/AO | DAC Right Channel / General GPIO |
| 2 | PB10 | I/O | GPIO / SPI2 Data Out / ADC9 / UART2 RX / PWM Output |
| 3 | PB9 | I/O | GPIO / SPI2 Clock / Timer Capture Input / UART2 TX |
| 4~17 | Other GPIOs, Power Pins, Ground, Crystal Oscillator, USB Interface, etc. (Refer to Datasheet for full details) | ||
| 18 | USBDM | I/O | USB D- / UART1 RX / IIC_SDA |
| 19 | USBDP | I/O | USB D+ / IIC_SCL / ADC12 Input |
| 20 | PA4 | I/O | GPIO / Capacitive Touch Channel 4 |
| 21 | PA3 | I/O | GPIO / UART2 RX / Timer Capture / Touch Channel 3 |
| 22~28 | Audio dedicated pins including MIC_BIAS, AUDIO_ADC_IN, DACL Left Audio Output | ||
※ Complete 28-pin definition and multiplex functions are available in official datasheet. GSMICRO can provide full PIN MAP documentation upon request.
Package Dimensions (SSOP28 / QSOP28)
• Body Width: 5.3mm (Typical) • Body Length: 9.9mm
• Lead Pitch: 0.635mm
• Max Height: 1.75mm
• Package Model: SSOP28-150mil / QSOP28
(Detailed dimensions comply with JEDEC standards, PDF package drawing available for download)
Typical Application Circuit & Single-Mic Offline Voice Solution
YT2228 Single-Mic Offline Voice Solution (Recommended Circuit Architecture) – Minimal BOM count, fast implementation of voice control + Bluetooth audio playback.
Key Circuit Connection Notes:
▪ Power Supply: VBAT connects to Li-ion battery (3.7~4.2V) or DC 5V; LDO_IN serves as 5V charging input; VDDIO outputs fixed 3.3V IO power.
▪ Crystal Oscillator: 24MHz crystal mounted between BT_OSCI/BT_OSCO with 10~12pF load capacitors.
▪ Microphone: Analog electret mic connects to MIC_BIAS and AUDIO_ADC_IN, on-chip bias voltage provided.
▪ Audio Output: DACL/DACR feeds audio amplifier (e.g. NS4150), capacitorless output design supported.
▪ Antenna: BT_RF pin matched with π-type RF matching network + ceramic antenna or PCB trace antenna.
▪ Debug & Firmware Upgrade: UART0 (PB1 series) for log output; USB interface supports forced flash programming.
| Component | Specification | Qty |
|---|---|---|
| YT2228 | SSOP28 Package | 1 |
| Crystal Oscillator | 24MHz ±20ppm | 1 |
| Audio Amplifier | NS4150 / CS8121S Mono Class D Amp | 1 |
| Microphone | Analog Electret / MEMS Silicon Mic | 1 |
| Speaker | 4Ω~16Ω Impedance / 2W~5W Power | 1 |
| Passive Components | Standard 0402/0603 Resistors, Capacitors, Inductors | Misc. |
Design Tips:YT2228 only supports single-mic architecture without AEC (Acoustic Echo Cancellation). Voice recognition performance will degrade with local audio playback, recommended for quiet or near-field interactive devices. 13 spare GPIOs are available for external keys, LED indicators and analog sensors. Firmware programming supports USB forced download, 1-to-2 bare die programming and 1-to-8 PCBA mass production programming.
Typical Application Scenarios
Supported Product Form Factors: All above white goods, small home appliances and control panels can implement offline voice command library (max 100 entries) + Bluetooth audio/music calling via YT2228, supporting multi-turn voice interaction and UART/IR external control.
Core Voice Capabilities: Single-mic 5-meter far-field pickup, built-in noise suppression, customizable wake-up word & command words, editable voice prompt audio.
Development Support & Implementation Guide
✅ Full SDK & voice model training toolchain provided, supports custom wake-up words and up to 100 offline command entries.
✅ Hardware reference schematic, PCB layout guide available upon request from GSMICRO Semiconductor.
✅ External device control via UART/GPIO, PWM dimming & speed regulation, capacitive touch extension, SPI/IIC external sensor connection supported.
✅ Complete mass production programming tools (USB forced download, 1-to-2, 1-to-8 batch programmer) and documentation, compatible with bare dies and finished PCBA boards.
✅ Bluetooth OTA command word update function will be released in future firmware versions.
Drop-In Compatibility & Competitive Benchmarking (YT2228 Outstanding Advantages)
| Comparison Item | YT2228 | CI1102 (Qiying Tailun) | Jerry AC695N |
|---|---|---|---|
| Processor Core | 32-bit DSP+FPU 240MHz | 32-bit CPU 160MHz | 32-bit DSP 240MHz |
| Onboard Storage | 2MB Flash+192KB RAM | External SPI Flash Required | External Flash Required |
| Bluetooth Version | V5.3 BR/EDR/BLE | No Bluetooth Function | Bluetooth 5.2 |
| DAC SNR | 95dB | ~90dB | ~94dB |
| Integrated Battery Charger | Yes, 20~320mA Programmable | No | No |
| Spare GPIOs | 13 Pins | Approx. 8~10 Pins | Approx. 12 Pins |
| Package / Standby Current | SSOP28, Standby ~10mA | QFN32, Higher Power Consumption | QFN24, ~10mA Standby |
GSMICRO YT2228 Core Competitive Summary: Compared with mainstream offline voice ICs on market, YT2228 integrates large-capacity 2MB Flash and 192KB RAM without external memory components, greatly reducing PCB footprint. Built-in Bluetooth 5.3 and battery charging management realize voice interaction, wireless audio and power management on single chip, with up to 13 expandable GPIOs. It is the optimal low-cost solution for voice upgrade of smart home appliances.
Frequently Asked Questions (YT2228)
Q1: Does YT2228 support external SPI Flash? Can firmware boot from external flash?
A: External flash storage expansion is supported, but system firmware always boots from internal built-in Flash, external flash boot is not available.
Q2: How many spare GPIOs are available for customer secondary development besides voice functions?
A: Up to 13 spare GPIOs for YT2228 series (Note: PC7, PC6, PB5, PB11 are not recommended for general IO usage), applicable for physical keys, LED indicators and analog sensors.
Q3: Typical operating power consumption & deep sleep leakage current?
A: Standby mode ~10mA, voice recognition active ~20mA, Bluetooth audio playback ~20mA, Bluetooth call ~30mA. Deep sleep leakage current refers to dedicated application datasheet (optimized Bluetooth baseband power consumption).
Q4: Is AEC (Acoustic Echo Cancellation) supported?
A: YT2228 only implements single-mic voice architecture without AEC function. Recognition performance will be compromised when local audio playback is active; deployment in quiet or short-distance interactive equipment is recommended.
Q5: Can offline command word library be upgraded via Bluetooth OTA?
A: Bluetooth OTA function is not available temporarily, to be released in future firmware updates. Current firmware upgrade via USB programmer or batch flash tools only.
Q6: Does the chip support multi-language voice algorithm?
A: Standard firmware supports Mandarin Chinese only; English and other foreign language versions are under roadmap based on global market demand.
Q7: What firmware programming methods are available? Is dedicated hardware programmer required?
A: Three programming modes: USB forced programming (R&D development), 1-to-2 bare die batch programming (mass production wafer), 1-to-8 PCBA board programming (finished assembly). Dedicated flash programmers are required, GSMICRO supplies corresponding hardware tools and operation documents.
Q8: What are the key differences between YT2228 and YT2216?
A: YT2228 adopts SSOP28 package with more spare GPIOs (13 pins), 2MB Flash +192KB RAM storage; YT2216 is SOP16 mini package for ultra-low-cost minimal applications. Firmware binaries are incompatible between two models, contact GSMICRO for professional model selection guidance.
Ordering Information
Authorized Partner & Global Technical Support — GSMICRO Semiconductor (Shenzhen) Co., Ltd.
Founded in 2023, GSMICRO Semiconductor (Shenzhen) Co., Ltd. (Former brand LUMENCHIP established in 2010) is headquartered in Shenzhen, China’s tech hub. We are a leading analog IC integrated service provider focusing on mixed-signal chip R&D and mass production implementation for intelligent green electronics applications.
GSMICRO integrates global supply chain resources and innovates a dual-mode business model combining semiconductor authorized distribution, market forecasting, turnkey solution development and full-lifecycle mass production support, breaking traditional separate distribution & technical service patterns. Our hybrid business system (self-owned brand + authorized agency, distribution + solution service) delivers differentiated value for global electronic OEM/ODM manufacturers. We collaborate closely with customers to deliver customized, cost-competitive IC products and full system solutions, supporting sustainable profitability for global electronic product brands. Our in-house R&D team develops power management and intelligent control ICs, while distributing a full portfolio of MCU, power management, AI voice chip, signal chain and power discrete devices. Our product lineup covers signal acquisition, voice wake-up, offline voice recognition, voice synthesis, natural language processing and smart interactive control. We maintain long-term authorized partnerships with international semiconductor brands including DONGWOON (Korea), CR MICRO, XLSEMI, APM, AISPEECH, Aerosemi and more than 30 worldwide IC manufacturers.
Guided by core values "Employee-Oriented, Customer-Centric, Value-Driven Innovation", GSMICRO leads the semiconductor distribution and turnkey solution industry by delivering full technical support for authorized IC product mass production and sustainable intelligent hardware innovation.
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