Texas Instruments RM44L520APZTR

Overview

RM44L520APZTR from Texas Instruments is a safety-certifiable 32-bit ARM Cortex-R4F microcontroller designed for IEC 61508 functional safety applications. It features dual lockstep CPUs, 768KB flash with ECC, 128KB RAM with ECC, 180-MHz operation, and integrated diagnostics including BIST, voltage/clock monitoring, and error signaling via nERROR pin-used in industrial PLCs and medical infusion pumps.

For engineers reviewing the RM44L520APZTR datasheet, RM44L520APZTR pinout, RM44L520APZTR application, or RM44L520APZTR equivalent, key selection criteria include its ASIL-D-capable lockstep architecture, dual N2HET timing coprocessors (32 + 18 channels), three DCAN controllers compliant with CAN 2.0B up to 1 Mbps, and support for 100-pin LQFP (PZ) packaging with 45 GPIOs.

Technical Context

The RM44L520APZTR implements a dual-core lockstep execution model where both Cortex-R4F CPUs execute identical instructions and compare results in real time; mismatch triggers ESM fault signaling. Its FMPLL generates system clocks up to 180 MHz with built-in slip detection, while the Global Clock Module routes six clock sources-including external crystal, PLL outputs, and internal oscillators-to domain-specific peripherals.

Memory subsystem includes ECC-protected 768KB flash (with 64KB emulated EEPROM), 128KB SRAM, and parity-protected peripheral buffers for MibADCs, MibSPIs, and DMA control RAM. The dedicated HTU units transfer N2HET instruction/data between 160-word protected RAM and main memory under MPU enforcement.

Key Specifications

Pinout & Package

RM44L520APZTR is housed in a 100-pin LQFP (PZ) package measuring 14.0 mm × 14.0 mm, RoHS-compliant and green-qualified. Pin functions are multiplexed across GIO, analog, timer, communication, and power domains; default configuration at reset assigns pins to primary peripheral roles per TI SPNS229C datasheet Section 4.2.2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with RM44L920PGE and RM42L432PZ, RM44L520APZTR uniquely balances ASIL-D readiness, 100-pin compactness, and full-feature N2HET/DCAN capability-making it optimal for new industrial and medical designs needing certified performance without over-provisioning.

Availability

RM44L520APZTR is available at Aetrix Electronics and suitable for industrial PLCs, medical infusion pumps, wind turbine pitch control, and radiation therapy systems requiring stable component supply across long production lifecycles.

Supply support for RM44L520APZTR 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies with decades of automotive and industrial safety IC experience.

The RM44Lx20 product line delivers ARM Cortex-R-based MCUs engineered specifically for IEC 61508 and ISO 26262 functional safety applications-featuring lockstep cores, ECC memory, and integrated diagnostics to reduce system-level certification effort.

FAQ

What safety certifications does the RM44L520APZTR support?

The RM44L520APZTR is architected for IEC 61508 SIL3 and ISO 26262 ASIL-D compliance. It includes dual lockstep CPUs, ECC on flash and RAM, BIST for CPU and memory, voltage/clock monitors, and ESM fault signaling-all documented in TI's Functional Safety Documentation Package (SPRUIK5). RM44L520APZTR itself is not pre-certified, but its hardware features enable certified system development.

Does RM44L520APZTR support CAN FD or only classical CAN?

RM44L520APZTR supports only Classical CAN per ISO 11898-1:2015 (CAN 2.0A/B), with three DCAN controllers operating up to 1 Mbps. It does not implement CAN FD framing, bit rate switching, or extended data length. For CAN FD, consider TI's TCAN4550 or newer Hercules TMS570LS series devices.

What is the maximum ADC sampling rate achievable with RM44L520APZTR?

Each MibADC module in RM44L520APZTR supports up to 5 MSPS conversion rate. With two independent ADCs and shared channel arbitration, sustained aggregate throughput reaches 10 MSPS when configured for interleaved or parallel sampling-enabling high-fidelity current/voltage capture in motor drives and power converters.

Can RM44L520APZTR operate without an external crystal?

Yes. RM44L520APZTR can use its internal oscillator or an external clock source applied to OSCIN. However, for functional safety compliance, TI recommends using a crystal (4–25 MHz) with FMPLL to ensure precise clock monitoring and slip detection-critical for ESM fault detection and ASIL-D runtime integrity.

How many GIO pins on RM44L520APZTR support interrupt generation?

RM44L520APZTR provides 45 general-purpose I/O pins in its 100-pin PZ package, of which 9 are interrupt-capable (GIOA[0–7], GIOB[0]). These support configurable edge/level-triggered interrupts with priority managed by the 128-channel Vectored Interrupt Module (VIM), enabling responsive event handling in safety-critical subsystems.