NXP Semiconductors MIMXRT1021CAG4B

Overview

MIMXRT1021CAG4B from NXP Semiconductors is an Arm Cortex-M7-based crossover processor operating at 396 MHz, featuring 256 KB on-chip RAM (configurable as TCM/OCRAM), dual FlexCAN interfaces, 10/100 Ethernet with IEEE 1588 support, and 96 GPIOs in a 144-pin LQFP package. It targets industrial motor control, IoT edge gateways, and home appliance HMI systems requiring real-time responsiveness and integrated power management.

For engineers reviewing the MIMXRT1021CAG4B datasheet, MIMXRT1021CAG4B pinout, MIMXRT1021CAG4B application, or MIMXRT1021CAG4B equivalent, key selection criteria include its 144-pin LQFP package with full SEMC and dual uSDHC support, 396 MHz deterministic execution, industrial temperature range (−40°C to +105°C), and hardware-accelerated security features including HAB, DCP, and BEE.

Technical Context

The MIMXRT1021CAG4B implements a single Arm Cortex-M7 core with 16 KB I-cache, 16 KB D-cache, and VFPv5 FPU for deterministic real-time processing. Its memory subsystem integrates 96 KB boot ROM and 256 KB flexible RAM, with dynamic allocation between I-TCM, D-TCM, and OCRAM in 32 KB granularity.

Peripherals include two FlexCAN modules compliant with CAN 2.0B, one 10/100 ENET controller with IEEE 1588 timestamping, dual uSDHC supporting eMMC 4.5/SD 3.0 at up to 100 MB/s, three SAI modules for I2S/TDM audio, and a Smart External Memory Controller (SEMC) supporting SDRAM, NOR, NAND, and PSRAM - all accessible via dedicated high-speed buses without CPU intervention.

Key Specifications

Pinout & Package

Package: 144-pin LQFP, 20 × 20 mm, 0.5 mm pitch - thermally robust, reflow-compatible, and compatible with standard PCB assembly processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MIMXRT1021CAG4B, MIMXRT1021CAF4B sacrifices SEMC, GPIO count, and dual uSDHC for smaller footprint, while STM32H743VI trades integrated power management and Ethernet for higher clock speed and embedded Flash - making MIMXRT1021CAG4B optimal for memory-extensible, power-simple, Ethernet-connected industrial edge nodes.

Availability

MIMXRT1021CAG4B is available at Aetrix Electronics and suitable for industrial motor control, IoT edge gateways, and home appliance HMI systems requiring stable component supply across extended product lifecycles.

Supply support for MIMXRT1021CAG4B 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, and IoT markets, with deep expertise in Arm-based microcontrollers and crossover processors.

The i.MX RT series was designed to bridge the gap between MCUs and application processors - delivering MCU-level ease-of-use with application-processor-class performance, targeting real-time industrial and consumer edge devices.

FAQ

What is the maximum operating frequency of the MIMXRT1021CAG4B?

The MIMXRT1021CAG4B operates at a maximum frequency of 396 MHz. This is a fixed, production-qualified speed grade specified in the official NXP ordering information table for this part number. The device does not support overclocking beyond 396 MHz, and all timing parameters in the datasheet - including SDRAM, FlexSPI, and peripheral bus timing - are validated at this frequency. Running MIMXRT1021CAG4B above 396 MHz violates electrical specifications and voids warranty.

Does the MIMXRT1021CAG4B include on-chip Flash memory?

No, the MIMXRT1021CAG4B does not include on-chip Flash memory. It relies on external storage via FlexSPI (for XIP-capable NOR/NAND/QuadSPI), uSDHC (for eMMC/SD), or SEMC (for parallel NOR/SDRAM). The device contains 96 KB of boot ROM and 256 KB of on-chip RAM that can be configured as TCM or OCRAM. This architecture allows flexible memory mapping but requires external non-volatile storage for firmware, which is typical for crossover processors like the MIMXRT1021CAG4B.

What is the difference between MIMXRT1021CAG4B and MIMXRT1021CAG4A?

The MIMXRT1021CAG4B and MIMXRT1021CAG4A share identical electrical specifications, package (144-pin LQFP), feature set, and temperature range (−40°C to +105°C). The suffix 'B' denotes a later silicon revision with minor errata fixes and enhanced manufacturing yield - confirmed in NXP's IMXRT1020IEC Rev. 3.1 datasheet. Both parts are functionally interchangeable in new designs, though MIMXRT1021CAG4B is recommended for production due to improved reliability and long-term availability.

Which debug interfaces are supported by the MIMXRT1021CAG4B?

The MIMXRT1021CAG4B supports both 5-pin JTAG and Serial Wire Debug (SWD) interfaces, selected via eFuse configuration. The CoreSight debug architecture includes DAP, TPIU, and SWO trace capability. Debug access is enabled through the SJC (System JTAG Controller), which enforces security modes to prevent unauthorized access. No external debug probe is required beyond standard Arm-compliant tools such as LPC-Link2 or SEGGER J-Link, and all debug functionality is fully operational with the MIMXRT1021CAG4B out of reset.

Can the MIMXRT1021CAG4B directly drive an SDRAM chip?

Yes, the MIMXRT1021CAG4B can directly drive SDRAM chips via its Smart External Memory Controller (SEMC). The SEMC supports 8/16-bit SDRAM up to SDRAM-133 (133 MHz clock), with programmable timing parameters for CAS latency, RAS-to-CAS delay, and refresh intervals. Pin assignments for address, data, and control signals (e.g., SDRAM_A[12:0], SDRAM_DQ[15:0], SDRAM_CAS, SDRAM_RAS) are defined in the 144-pin LQFP package and require length-matched routing. No external SDRAM controller IC is needed when using MIMXRT1021CAG4B.