NXP Semiconductors MIMX9321CVXXMAB

Overview

MIMX9321CVXXMAB from NXP Semiconductors is an industrial-grade dual-core Arm® Cortex®-A55 applications processor operating at up to 1.7 GHz, integrated with a neural processing unit (NPU) for ML inference acceleration, a Cortex®-M33 real-time co-processor (250 MHz), and dual 1 Gbps Ethernet controllers - one supporting Time-Sensitive Networking (TSN). It targets industrial HMI, touchless access control, and energy metering systems requiring deterministic low-latency networking and edge AI capability.

For engineers reviewing the MIMX9321CVXXMAB datasheet, MIMX9321CVXXMAB pinout, MIMX9321CVXXMAB application, or MIMX9321CVXXMAB equivalent, key selection criteria include its 9 × 9 mm FCBGA208 package, LPDDR4X support with inline ECC, single Gigabit Ethernet + TSN, single USB 2.0, parallel camera/display interface, and industrial temperature range (–40 °C to +105 °C).

Technical Context

The MIMX9321CVXXMAB implements a heterogeneous compute architecture: two Cortex-A55 cores (1.7 GHz, 64 KB L2 cache per core, 256 KB cluster L3 cache with ECC) handle high-level OS tasks, while the Cortex-M33 (250 MHz, 256 KB TCM, MPU/FPU/NVIC) manages real-time I/O, power state coordination, and secure boot supervision. The NPU delivers 256 MACs @ 1.0 GHz for integer-based RNN inference.

Its connectivity stack includes one TSN-capable Gigabit Ethernet controller, one USB 2.0 PHY, two FlexCAN modules (CAN-FD optional), eight LPUARTs, eight LPI2C, and eight LPSPI interfaces. Memory subsystem supports 16-bit LPDDR4X/LPDDR4 up to 2 GB with inline ECC, plus FlexSPI for XIP-capable NOR/NAND flash.

Key Specifications

Pinout & Package

Package: FCBGA208, 9 × 9 mm, 0.5 mm pitch, 0.8 mm height (ball array: 13 × 13, corner balls omitted). Thermal pad exposed on underside for PCB heatsinking.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar applications processor applications.

Compared with MIMX9321CVXXMAB, MIMX9322CVXXMAB provides redundancy for safety-critical real-time functions, while MIMX9311CVXXMAB sacrifices NPU and one A55 core to lower unit cost - neither offers pin-to-pin compatibility, but all three share identical 9×9 mm FCBGA208 footprint and power delivery requirements.

Availability

MIMX9321CVXXMAB is available at Aetrix Electronics and suitable for industrial HMI, touchless access control, and energy metering applications requiring stable component supply across extended product lifecycles and rigorous environmental qualification.

Supply support for MIMX9321CVXXMAB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, IoT, and communication infrastructure markets.

The i.MX 93 family - including MIMX9321CVXXMAB - is designed specifically for power-optimized, secure edge intelligence in industrial and building automation, delivering integrated AI acceleration, TSN networking, and hardware-enforced security in a compact package.

FAQ

What is the maximum operating temperature specification for the MIMX9321CVXXMAB?

The MIMX9321CVXXMAB is rated for industrial temperature operation with a junction temperature range of –40 °C to +105 °C. This rating is validated per JEDEC JESD22-A104 and applies under specified power dissipation and PCB thermal design conditions outlined in the IMX93IEC datasheet Section 4.1.3. Derating is required above 85 °C ambient depending on airflow and copper area.

Does the MIMX9321CVXXMAB support Time-Sensitive Networking (TSN)?

Yes, the MIMX9321CVXXMAB integrates one Gigabit Ethernet controller with full IEEE 802.1AS (gPTP), 802.1Qbv (time-aware shaper), and 802.1Qci (per-stream filtering and policing) support. TSN functionality is implemented in hardware within the ENET1 controller and requires no software offload - enabling deterministic sub-100 µs latency for industrial control traffic.

What memory types and configurations does the MIMX9321CVXXMAB support?

The MIMX9321CVXXMAB supports 16-bit LPDDR4X and LPDDR4 with inline ECC, up to 2 GB addressable space. It also includes FlexSPI for XIP-capable Octal/Quad SPI NOR/NAND flash and three uSDHC interfaces (eMMC 5.1, SDXC, SDIO). On-chip memory comprises 640 KB OCRAM with ECC and 256 KB boot ROM per core.

Is the NPU in the MIMX9321CVXXMAB enabled and usable out-of-the-box?

Yes, the NPU is fully enabled in the MIMX9321CVXXMAB and supported by NXP's eIQ™ Toolkit, which provides optimized inference engines (TensorFlow Lite Micro, ONNX Runtime) and quantization tools. The NPU operates independently of the A55 cores and supports 8-bit/16-bit integer RNNs with up to 256 MACs @ 1.0 GHz - no fuse programming or special configuration is required.

What is the package type and ball count for the MIMX9321CVXXMAB?

The MIMX9321CVXXMAB uses a 208-ball Fine-Pitch Chip Scale Ball Grid Array (FCBGA) package measuring 9 mm × 9 mm with 0.5 mm pitch. The ball map follows JEDEC MO-274AC standard, and the package includes an exposed thermal pad on the underside for direct PCB thermal coupling - detailed mechanical drawings are in IMX93IEC Section 10.