CSS6404LS supports the mass production of Espressif ESP32 millimeter-wave human presence radar with stable performance.

In millimeter-wave biometric radar products (vital sign monitoring, sleep monitoring, fall detection, two-way audio intercom) based on the Espressif ESP32 main control platform, the CSS6404LS-LI 64Mbit QSPI pSRAM serves as the core extended memory to realize unobtrusive sensing, real-time audio and stable network connection. It delivers outstanding advantages in capacity, bandwidth, power consumption, wide temperature adaptability and mass production feasibility.

Core Chip Features for Millimeter-Wave Radar

The CSS6404LS-LI is an industrial-grade QSPI pseudo-SRAM tailored for IoT and sensing devices:

Capacity: 64Mbit (8MB) large-capacity extended memory

Interface: High-speed 4-wire SPI/QPI, supporting linear burst and Wrap32

Wide Temperature: Industrial grade from -40℃ to +85℃

Power Supply: 3.3V single power supply (2.7–3.6V)

Auto Refresh: On-chip self-managed refresh without main controller intervention

Package: SOP-8 compact size, easy wiring and mass production

Key Advantages with ESP32 & Millimeter-Wave Radar

1. Break ESP32 Memory Bottleneck to Stabilize Audio Intercom

The on-chip SRAM of ESP32 is limited and needs to support Wi-Fi/Bluetooth, system operation and radar protocol stacks.

The CSS6404LS-LI provides 8MB high-speed external memory for:

PCM audio collection and real-time buffering

Intermediate computing for AEC echo cancellation and NS noise reduction algorithms

Audio file temporary storage and codec buffer

System heap expansion to prevent OOM errors and system crashes

It ensures frame-loss-free long-time recording, low-latency two-way intercom, and 24/7 stable system operation.

2. High-Speed QSPI Interface for High Concurrent Radar & Audio Loads

Adopting 4-wire QPI mode, it reaches up to 109MHz at 3.3V with 84MHz cross-page linear burst.

It connects directly to the ESP32 hardware QSPI controller and supports high-speed DMA transmission.

Radar point cloud analysis, vital sign calculation, audio processing and Wi-Fi upload can run in parallel, ensuring real-time intercom, smooth algorithm operation and unblocked data transmission.

3. Self-Refresh Architecture to Free ESP32 Computing Power

Built-in automatic refresh requires no regular driving from ESP32 with zero CPU overhead.

With a standard instruction set, it is fully compatible with ESP-IDF for simple driver adaptation and rapid porting.

The main controller can focus on breathing/heart rate calculation, micro-motion detection, fall judgment and abnormal alarm, bringing faster system response, higher algorithm accuracy and optimized power consumption.

4. Industrial Wide Temperature & Low Power for Long-Term Monitoring

Designed for -40℃~+85℃ wide temperature range, it ensures year-round reliability in indoor monitoring, elderly care and medical scenarios.

Low power consumption performance:

Typical operating current: ＜7mA

Standby current: ＜250μA @ 85℃

Data retention in sleep: Low to 100μA

Direct 3.3V connection with ESP32 and radar front-end eliminates level conversion circuits and simplifies hardware design.

5. SOP-8 Package for High-Volume Radar Mass Production

The 8-pin compact layout shortens QSPI routing and facilitates equal-length wiring design.

It features strong anti-interference performance, perfectly suited for millimeter-wave RF environments.

With a universal package, high mounting yield and easy maintenance, it supports stable domestic supply chains and cost-effective mass delivery.

Application Value

For ESP32-based millimeter-wave biometric radar solutions:

Better Experience: Integrates unobtrusive monitoring and high-definition two-way audio with stable recording, clear intercom and accurate alarm output.

Higher Stability: Large external memory avoids insufficient RAM, enabling long-term unattended operation without crash or reboot.

Faster R&D: Native ESP-IDF compatibility with simplified drivers accelerates product launch and mass production.

Lower Hardware Cost: SOP-8 package saves PCB space and peripheral components, reducing overall BOM and manufacturing costs.

Higher Reliability: Wide temperature resistance, low power consumption, auto refresh and strong anti-interference meet harsh application requirements.

The CSS6404LS-LI is the optimal external memory solution for ESP32 millimeter-wave biometric radar. With six core strengths — large capacity, high-speed QSPI, auto refresh, industrial wide temperature, low power consumption and easy mass production — it comprehensively enhances equipment stability, real-time performance and market competitiveness.

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