Cascade pSRAM Optimizes Power Consumption Management for Medical Wristbands

With the intelligent development of medical health devices, medical smart bracelets have evolved from basic physiological parameter monitoring to comprehensive health management platforms integrating real-time health data analysis, disease warning, and remote diagnosis. Their hardware architecture typically adopts a "multi-modal biosensor + main MCU + wireless communication module + storage unit" combination, where the storage unit needs to continuously record high-frequency physiological data and support fast interactions. Compared to traditional SRAM or DRAM, pseudo-static RAM (pSRAM) stands out due to its high integration, low power consumption, and easy scalability. By integrating a self-refresh controller, pSRAM simplifies design complexity, achieves higher storage density in the same volume, and maintains microsecond-level read/write speeds, significantly optimizing the balance between power consumption and performance in medical bracelets, providing reliable support for continuous health monitoring.

In medical bracelet applications, the 64Mbit pSRAM serves as the core for high-frequency physiological data caching and temporary storage. This capacity meets the needs for temporarily storing raw data such as heart rate, blood oxygen saturation, and body temperature fluctuations for over 24 hours, while reserving buffer space for sudden abnormal events (e.g., automatic arrhythmia detection). Its technical advantages are highlighted in three aspects:

1. Hardware-level low-power management: Standby current as low as microamps, less than 1/5 of traditional DRAM solutions, effectively extending device battery life.

2. High-speed data throughput: Supports clock frequencies above 200MHz, ensuring lossless recording of abnormal event data.

3. No external refresh circuit required: Significantly simplifies PCB layout and reduces overall power consumption.

For example, in dynamic blood pressure monitoring scenarios, pSRAM can work with the MCU to achieve delay-free peak detection and trend analysis, improving data processing efficiency by over 30%, and helping medical bracelets upgrade from "monitoring" to "warning" functions.

Cascade’s CSL6408SB-A4 is a 64Mbit high-speed pSRAM chip using advanced technology and a compact BGA package (8mm×10mm), with an operating voltage range of 1.8V±0.15V. The device achieves breakthrough performance through an innovative architecture:

l Built-in temperature-compensated self-refresh mechanism, with data retention current not exceeding 2μA in the industrial temperature range of -40°C to +85°C.

l Supports configurable Partial-Array Self-Refresh function, intelligently turning off inactive memory blocks to optimize power consumption.

Key parameter advantages compared to similar products include:

1. Storage capacity: 64Mbit, precisely matching medical bracelet data caching needs.

2. Standby power consumption: 1.8μA (temperature compensation mode), 40% lower than traditional solutions.

3. Read/write speed: 200MHz clock frequency, enhancing data throughput for high-precision monitoring.

4. Temperature range: -40°C to +85°C, ensuring stable operation in extreme environments.

5. Package size: 8mm×10mm×1.2mm BGA, reducing board space and adapting to compact designs.

The chip integrates programmable drive strength control, supports direct connection with mainstream MCUs (e.g., ARM Cortex-M series), and requires no external level-shifting circuits. Its deep power-down mode reduces static current to 0.1μA, and combined with burst read/write operations, it perfectly adapts to the intermittent working characteristics of medical bracelets. In medical-grade applications, the CSL6408SB-A4’s ECC error correction capability can detect and correct single-bit errors, ensuring clinical reliability of vital signs data.

As an authorized agent of Cascade, MANDU provides full-cycle technical support, including chip selection, signal integrity simulation, free sample applications, and mass production assurance, helping customers shorten development cycles.

For medical bracelet manufacturers, the Cascade CSL6408SB-A4 pSRAM, with its combination of high density, low power consumption, and high reliability, becomes a key technological support to enhance product competitiveness. Its single-chip solution can replace traditional "SRAM + SDRAM" combinations, reducing component count and PCB area, while extending device battery life through hardware-level low-power characteristics. In scenarios such as chronic disease management and elderly health monitoring, the chip’s fast response and data integrity assurance capabilities provide reliable basis for medical diagnosis. Through MANDU’s localized technical service network, customers can quickly obtain customized support and accelerate time-to-market.

About Mandu Technology

Shenzhen Mandu Technology Co., Ltd. has steadfastly centered its operations on the distribution of high-performance, high-quality, and highly reliable integrated circuit products. Its portfolio encompasses memory chips, differential crystal oscillators, and MCU microcontrollers, while progressively integrating analog signal chain products. The company prides itself on delivering comprehensive and cost-effective solutions to its customers. Its products find applications across a broad spectrum of industries, including but not limited to network communication, industrial control, robotics, medical equipment, personal health, and numerous other fields.

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