Solderable module features energy-efficient NXP i.MX 91 applications processor

The QS91 system-on-module targets industrial and smart home applications requiring reliable Linux-based processing at a lower price point than multi-core alternatives. By utilizing the NXP i.MX 91 applications processor, the module provides a single-core solution for IoT edge devices that require a balance between power consumption and computational performance. This approach addresses market shifts where rising memory costs have increased the total cost of complex embedded modules, offering a pragmatic hardware path for high-volume edge deployments.

Thermal management and physical integration
The module is built in a solderable QFN-style format measuring 27 by 27 millimeters with a total height of 2.6 millimeters. This single-sided assembly uses a 1-millimeter pitch with 100 pads to facilitate integration onto carrier boards. The design prioritizes thermal management by utilizing a ground pad on the bottom side for heat transfer, which maintains operational stability without the requirement for external heatsinks in most environments. This physical layout also ensures signal routing that complies with electromagnetic compatibility standards, reducing the need for additional shielding in space-constrained enclosures.

Processor specifications and security
The core of the module is the NXP i.MX 91, which features a 64-bit ARM Cortex-A55 processor operating at 1.4 GHz. For data protection, the architecture includes the EdgeLock secure enclave, providing a silicon root of trust to mitigate physical and network-based security risks. The hardware configuration includes 512 megabytes of LPDDR4 RAM and 4 gigabytes of eMMC flash memory, supporting an extended industrial temperature range from -25 to +85 degrees Celsius. These specifications enable the module to manage secure communication protocols and localized data processing at the edge.

Connectivity and development support
System integration is facilitated through multiple interfaces, including an RGB parallel display interface, dual USB ports, CAN-FD, and Gigabit Ethernet. These features allow the module to serve as a central controller for networked industrial sensors and interface displays. For initial prototyping, a dedicated evaluation kit provides a Linux board support package to streamline software development. An alternative SODIMM-compatible version, the TX91, is also available for designs requiring modular hardware replacement or existing carrier board compatibility.

Edited by an industrial journalist, Lekshman Ramdas, with AI assistance.

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