Texas Instruments RM42L432BPZT

Overview

RM42L432BPZT from Texas Instruments is a safety-certified 32-bit ARM Cortex-R4 microcontroller for functional safety-critical systems, featuring dual lockstep CPUs, 384KB flash with ECC, 32KB RAM with ECC, 100-MHz operation, and integrated DCAN, N2HET, and MibADC peripherals. It targets industrial safety PLCs, medical infusion pumps, and turbine control where ASIL-D or SIL-3 compliance is required.

For engineers reviewing the RM42L432BPZT datasheet, RM42L432BPZT pinout, RM42L432BPZT application, or RM42L432BPZT equivalent, this page delivers verified technical context, exact pin functions for the 100-pin LQFP package, safety architecture details, real-world use cases in ventilators and safe PLCs, and two validated alternative parts with documented functional and packaging differences.

Technical Context

The RM42L432BPZT implements a dual-core lockstep execution architecture with built-in self-test (BIST) for CPU and on-chip RAMs, ECC protection on flash and SRAM, and parity on peripheral memories including DCAN mailboxes and MibADC buffers. Its error signaling module (ESM) drives the nERROR pin on fault detection.

It integrates a Frequency-Modulated PLL (FMPLL) with slip detector, a 12-bit MibADC with 16 analog inputs and 64-word parity-protected buffer, and a Next Generation High-End Timer (N2HET) with up to 19 programmable I/O pins and dedicated HTU for DMA-like transfers - all operating under a unified Hercules Common Platform memory map.

Key Specifications

Pinout & Package

RM42L432BPZT is housed in a 100-pin LQFP (PZ) package measuring 14.00 mm × 14.00 mm, RoHS-compliant and green-qualified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with RM42L432BPZT, RM44L920PZ offers greater memory and dual eQEP in the same 100-pin LQFP, while RM46L852ZWT provides networking features in a BGA package - neither is drop-in compatible, but both belong to the Hercules safety MCU family with consistent toolchain and safety documentation support.

Availability

RM42L432BPZT is available at Aetrix Electronics and suitable for industrial safety PLCs, medical infusion pumps, ventilator systems, and turbine control units requiring stable component supply across long production lifecycles.

Supply support for RM42L432BPZT 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and digital signal processing technologies.

The RM42L432BPZT belongs to TI's Hercules ARM-based safety microcontroller product line, designed specifically for IEC 61508 and ISO 26262 functional safety applications in industrial, medical, and transportation systems.

FAQ

What safety certifications apply to the RM42L432BPZT?

The RM42L432BPZT is architected to support IEC 61508 SIL-3 and ISO 26262 ASIL-D compliance. It includes dual lockstep CPUs, ECC memory, BIST logic, ESM with nERROR output, and parity-protected peripherals. While the device itself is not pre-certified, TI provides full safety documentation - including FMEDA reports, safety manuals, and diagnostic software libraries - enabling end-equipment certification. RM42L432BPZT is widely deployed in certified medical and industrial safety systems.

Does the RM42L432BPZT support CAN FD?

No, the RM42L432BPZT supports only Classical CAN (CAN 2.0B) up to 1 Mbps, as implemented in its two DCAN modules. It does not include CAN FD protocol support, frame formatting, or enhanced bit-rate capabilities. For CAN FD requirements, designers should consider newer Hercules devices such as the RM57L843 or TMS570LS12x, which integrate CAN FD controllers. RM42L432BPZT remains optimal for legacy CAN-based safety networks.

What is the role of the N2HET module in the RM42L432BPZT?

The N2HET (Next Generation High-End Timer) in the RM42L432BPZT is a programmable timing coprocessor with up to 19 I/O pins, used to generate precise PWM waveforms, capture encoder edges, or implement custom timing sequences - all without CPU intervention. It operates via a small instruction set and dedicated micromachine, with HTU enabling DMA-style transfers to/from main memory. In RM42L432BPZT, it directly supports motor control, valve actuation, and safety-critical pulse generation.

Can the RM42L432BPZT operate with a single 3.3-V supply?

No - the RM42L432BPZT requires three separate supply domains: VCC (1.2 V ±10% core voltage), VCCIO (3.3 V ±10% I/O voltage), and VCCAD (3.3 V ±10% ADC reference/supply). These must be independently regulated and sequenced per TI's power-on-reset specification. Using a single 3.3-V rail violates absolute maximum ratings and will damage the device or cause undefined operation. Proper decoupling and sequencing are mandatory for reliable RM42L432BPZT operation.

How many GPIO pins are interrupt-capable on the RM42L432BPZT?

The RM42L432BPZT provides 8 dedicated interrupt-capable GPIO pins (GIOA[0] through GIOA[7]), each configurable for rising-edge, falling-edge, or both-edge triggering. These pins are mapped to the 96-channel Vectored Interrupt Module (VIM) and support priority-based nested interrupt handling. Additional pins may serve as GPIO but lack dedicated interrupt capability unless multiplexed from peripherals like N2HET or eQEP - only the GIOA[7:0] group guarantees hardware interrupt support independent of peripheral mode.