STA321MPL1TR - 8-Channel PDM Microphone Processor | STMicroelectronics
料号： STA321MPL1TR ✓ 量产中STA321MPL1TR 概述
A digital microphone processor is an audio signal-processing IC that accepts pulse-density-modulated microphone data, combines multiple channels, applies configurable level and volume operations, and transfers the resulting digital audio stream to a host or audio system. In the product hierarchy, the STA321MPL1TR belongs to the scalable digital microphone processor class, then to digital audio processors, audio DSPs, and broader power-management-independent semiconductor signal-processing devices.
The processor provides eight independent 24-bit digital processing paths. Six channels use physical PDM inputs, while two virtual channels expand the usable processing capability beyond the physical microphone count. The 58 dB to -100 dB gain range gives system designers broad attenuation and amplification control, with each adjustment available in 0.5 dB increments. Soft volume updates allow level changes to be applied without abrupt volume transitions.
STMicroelectronics describes the device as a fully digital, high-performance, multichannel processor designed for general-purpose digital microphone applications. Its digital signal path avoids an analog mixer stage after PDM conversion, helping preserve microphone signal integrity while providing centralized channel and master level management. The architecture can serve multi-microphone systems requiring configurable channel routing and software-controlled levels.
Typical uses include digital microphone arrays, voice-capture systems, conference equipment, smart audio endpoints, and embedded voice interfaces. Six PDM microphones can be processed concurrently, while the two virtual channels support additional flexible signal-processing resources. A host processor can configure channel gain, master level, and volume behavior through the device control interface.
The principal design considerations are PDM clocking, microphone data synchronization, digital-mic power sequencing, and firmware configuration of channel gain and routing. Designers should preserve short, matched digital paths between microphones and the processor and follow the manufacturer’s reference configuration for clock polarity, decimation, and system initialization.
This page consolidates the processor architecture, application guidance, verified sourcing information, and design-focused selection criteria into one engineering reference. Use the manufacturer datasheet for the complete register map, timing diagrams, electrical limits, and pin assignments when finalizing a PCB or embedded audio design.
直接替换替代料： STA321MPL1TR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： STA321MPL1TR （相同外形与封装尺寸） ——差异在于 Package.
STA321MPLTR
✅ 直接替换联系询价
查看数据手册 →STA321MPL1TR 最大额定值与电气特性
| Product Type | Scalable digital microphone processor |
| Digital Processing Channels | 8 channels |
| PDM Input Channels | 6 channels |
| Virtual Channels | 2 channels |
| Processing Resolution | 24 bits per channel |
| Signal-to-Noise Ratio | >100 dB |
| Dynamic Range | >100 dB |
| Digital Gain Range | 58 dB to -100 dB |
| Gain Adjustment Step | 0.5 dB |
| Volume Update | Soft volume update |
| Level Control | Individual channel and master level control |
| Architecture | Fully digital multichannel processor |
| User Register Width | Up to 10 independent 32-bit user registers |
| 封装 | 64-TQFP, 10 x 10 mm |
| 安装类型 | Surface mount |
STA321MPL1TR 64-tqfp, 10 x 10 mm 引脚配置指南
STA321MPL1TR（64-tqfp, 10 x 10 mm 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： STA321MPL1TR.
请参阅 数据手册 以查看完整引脚配置。
典型应用
STA321MPL1TR 适用于 6 应用s: Digital Microphone Arrays, Voice-Activated Smart Speakers, Conference Room Audio, Industrial Voice Recognition, Portable Wearable Voice Interfaces, Robotics and Voice-Controlled Equipment.
Digital Microphone Arrays
The STA321MPL1TR fits multichannel array designs because it accepts six PDM microphone inputs and provides eight 24-bit processing channels, including two virtual channels. Individual channel gain and attenuation from 58 dB to -100 dB in 0.5 dB steps allow calibration of microphones with different sensitivities or positions. More than 100 dB SNR and dynamic range support faithful capture of voice and ambient sound, while soft volume updates help prevent abrupt level changes during array operation.
推荐
Voice-Activated Smart Speakers
A smart speaker can use the STA321MPL1TR to condition six synchronized PDM microphones before forwarding digital audio to a host processor. The six physical inputs support far-field microphone placement around a cabinet, while the two virtual channels add processing flexibility. Per-channel attenuation lets a system compensate for acoustic path differences, and the 0.5 dB gain increments support fine calibration. Soft volume updates also support controlled gain changes during automatic voice activity control.
推荐
Conference Room Audio
The STA321MPL1TR is appropriate for conference-room endpoints that need multiple microphone inputs without separate analog mixer channels. Its fully digital processing path can receive PDM microphone data, apply channel-specific levels, and provide a master level control for the captured voice stream. The eight-channel, 24-bit architecture provides processing capacity beyond the six physical microphone inputs, while more than 100 dB SNR and dynamic range helps preserve intelligibility across near-field and far-field participants.
推荐
Industrial Voice Recognition
The STA321MPL1TR supports industrial voice-recognition terminals that require deterministic digital microphone conditioning in noisy environments. Six PDM inputs permit microphone redundancy or spatial coverage, and channel-specific attenuation can compensate for enclosure reflections, speaker proximity, or differing microphone gains. The more than 100 dB SNR and dynamic range and 0.5 dB adjustment resolution provide useful control when the host applies noise suppression, beamforming, or feature extraction to the processed streams.
推荐
Portable Wearable Voice Interfaces
The STA321MPL1TR can support wearable or portable voice interfaces that use several digital microphones for noise robustness. Its fully digital PDM input architecture keeps microphone data in the digital domain before channel processing, and individual attenuation allows the host to balance signals from different orientations. The processor’s scalable channel arrangement gives designers room to use six physical microphones plus two virtual channels when a product architecture benefits from additional processing resources.
推荐
Robotics and Voice-Controlled Equipment
The STA321MPL1TR is useful in robots and voice-controlled machines that gather audio from microphones mounted at different positions. Six PDM inputs allow multiple sensing points to feed one processor, while per-channel gain and master level settings simplify system calibration. The digital processing architecture supports a clean division between microphone acquisition and host-side recognition. System designers should pay particular attention to shared clocks, PDM data synchronization, and deterministic initialization of the virtual channels.
推荐
推荐产品汇总
工程参考数据： STA321MPL1TR ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | STA321MPLTR |
|---|---|---|
| Product Type | Scalable digital microphone processor | Scalable digital microphone processor |
| Brand | STMicroelectronics | STMicroelectronics |
| Package | 64-TQFP (10 x 10 mm) | 64-TQFP (10 x 10 mm) |
关键差异点
- Broader channel-processing capacity （对比 STA321MPLTR)
- Fine-grained digital level control （对比 STA321MPLTR)
- Digital microphone processing architecture （对比 STA321MPLTR)
设计说明
Route PDM clock and data traces from each microphone as short, continuous paths to the processor, with a continuous reference plane and no unnecessary stubs. These high-speed digital signals depend on clean clocking and controlled impedance; long branches or breaks in the return path can increase timing margin requirements. Follow the manufacturer reference layout and preserve the documented placement and routing of input, clock, power, and decoupling connections.
Budget the digital-microphone power rails and processor supply independently from the audio signal level. Apply the manufacturer’s recommended local decoupling at the supply pins and route it with low loop area. Confirm the exact supply voltage, absolute maximum ratings, and power-sequencing requirements in the manufacturer datasheet before assigning a regulator, because those values are not stated in the part summaries and cannot be inferred from the TQFP package.
Do not treat six PDM inputs as six physical pins; the device also advertises eight digital processing channels because two are virtual. Firmware, channel routing, gain tables, and master-level behavior must therefore be configured together. Also verify microphone clock polarity and synchronization relationships before enabling capture, since incorrect clock configuration can corrupt PDM decoding even when all physical connections are present.
Use the manufacturer timing diagrams to establish the maximum clock rate, data setup and hold constraints, and permitted clock-to-data relationships for every connected microphone. Avoid introducing level-conversion devices or long jumper cables in the PDM path unless their propagation delay and level compatibility have been verified. Controlled impedance and uninterrupted clock distribution are especially important when several microphones are dispersed across a larger PCB.
合规信息
No explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statements are present in the available technical records. Confirm environmental and qualification documentation with STMicroelectronics before production release.
