AMA4B2KP-KXR

Overview

The AMA4B2KP-KXR is an RF System on a Chip (SoC) from the Apollo4 Blue Plus KXR series, manufactured by Ambiq Micro. It integrates a 32-bit ARM Cortex-M4F processor operating at 192MHz with a Floating Point Unit (FPU). The device features a 2.5D GPU for graphical processing and includes 2MB of Magnetoresistive RAM (MRAM) alongside 2.75MB of Static Random-Access Memory (SRAM). Connectivity is provided via Bluetooth Low Energy 5.4. The component utilizes a HexSPI interface for external memory access and is housed in a 131-pin Ball Grid Array (BGA) package. It supports an operating temperature range of -20°C to +60°C.

Feature Summary

• Integrates a high-performance ARM Cortex-M4F core with FPU and a dedicated 2.5D GPU for complex UI rendering.
• Supports Bluetooth Low Energy 5.4 wireless communication protocols.
• Features HexSPI interface enabling high-speed access to external PSRAM or other memory types.
• Combines substantial internal storage with 2MB MRAM and 2.75MB SRAM for algorithm execution.

Applications

• Smartwatches and children's watches requiring rich graphics and low power consumption.
• Fitness bands and animal trackers utilizing predictive health algorithms.
• Far-field voice remotes and smart home control devices.
• Wearable endpoint devices needing extended battery life with intelligent processing capabilities.

Procurement Notes

Verify the specific suffix KXR to confirm the inclusion of the HexSPI interface and 2.75MB SRAM configuration, as these parameters distinguish this variant from other Apollo4 Blue models. Ensure compatibility with the 131-pin BGA footprint during PCB layout. Confirm that the design supports the required operating temperature range of -20°C to +60°C for the intended deployment environment.

Selection Notes

Select the AMA4B2KP-KXR when external memory bandwidth is critical for graphics performance, leveraging its HexSPI capability. This model is suitable for applications requiring significant SRAM for neural networks or complex algorithms compared to the Lite variant. Verify pin compatibility if migrating from previous Apollo4 Blue generations, noting that the KP variant differs from the standard KBR pinout.

Part Context

This SoC belongs to the Apollo4 Blue Plus family, which extends the Apollo4 product line with enhanced graphical capabilities and updated Bluetooth standards. It is engineered on Ambiq's Subthreshold Power-Optimized Technology (SPOT) platform to balance intelligence with battery efficiency. The KXR suffix specifically denotes the HexSPI interface variant, differentiating it from the standard KBR version which lacks this high-speed external memory interface.

Replacement Considerations

The AMA4BKK-KBR is noted as pin-compatible with the AMA4BKP-KBR, but direct substitution with the KXR variant requires verifying HexSPI signal routing. No other public substitute part numbers are confirmed for this specific configuration.