Texas Instruments RM46L440CZWTT

Overview

RM46L440CZWTT from Texas Instruments is a safety-certified 32-bit ARM Cortex-R4F microcontroller for ASIL-D and SIL-3 applications, featuring dual lockstep CPUs, 1MB ECC flash, 128KB ECC RAM, 2× N2HET timing coprocessors (44 I/O), 7× ePWM modules, and triple CAN 2.0B controllers - deployed in industrial PLCs and medical infusion pumps.

For engineers reviewing the RM46L440CZWTT datasheet, RM46L440CZWTT pinout, RM46L440CZWTT application, or RM46L440CZWTT equivalent, key selection criteria include functional safety architecture (BIST, ECC, error signaling), real-time peripheral count (ePWM/eCAP/eQEP/MibADC), Ethernet + CAN coexistence, and ZWT BGA package compatibility with high-density safety-critical PCB layouts.

Technical Context

The RM46L440CZWTT implements a dual-CPU lockstep execution model with hardware BIST and memory ECC to meet ISO 26262 ASIL-D and IEC 61508 SIL-3 requirements. Its FMPLL and non-modulating PLL provide independent clock domains for safety monitoring and real-time control.

Peripheral subsystems are architecturally isolated: two 12-bit MibADCs (24 total inputs, 64-word parity buffers), three DCAN controllers (1 Mbps, CAN 2.0A/B), and EMAC with MII/RMII/MDIO support operate under dedicated MPU-protected memory spaces and DMA channels with parity-protected control RAM.

Key Specifications

Pinout & Package

RM46L440CZWTT uses a 337-ball NFBGA (ZWT) package with 0.8 mm pitch and 16.0 mm × 16.0 mm body size. Ball mapping supports full peripheral access including dual N2HET banks, MibADC reference and analog inputs, CAN transceiver interfaces, and EMAC MII/RMII pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with RM46L440CZWTT, RM46L840CZWTT offers expanded memory for advanced diagnostics without altering pinout or safety certification, while RM48L952ZWT trades motion-control peripherals for USB connectivity - making RM46L440CZWTT optimal for cost-constrained, encoder-dependent safety systems.

Availability

RM46L440CZWTT is available at Aetrix Electronics and suitable for industrial safety PLCs, medical infusion pumps, wind turbine pitch control, and radiation therapy linacs requiring stable component supply with long-term lifecycle assurance.

Supply support for RM46L440CZWTT 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 digital signal technologies with decades of automotive and industrial safety IC experience.

The RM46Lx40 product line was designed specifically for ASIL-D and SIL-3 functional safety applications, integrating lockstep CPUs, memory ECC, and hardware self-test to eliminate single points of failure in life-critical systems.

FAQ

What safety certifications does the RM46L440CZWTT support?

The RM46L440CZWTT supports ISO 26262 ASIL-D and IEC 61508 SIL-3 compliance through integrated dual lockstep CPUs, CPU and memory BIST, ECC on flash and RAM, parity on peripheral memories, and dedicated Error Signaling Module (ESM) with nERROR output. These features are documented in TI's functional safety documentation package for RM46L440CZWTT and validated per TÜV SÜD certification reports.

Does RM46L440CZWTT support Ethernet and CAN simultaneously?

Yes, RM46L440CZWTT supports concurrent 10/100 Mbps Ethernet (EMAC with MII/RMII/MDIO) and three independent CAN 2.0B controllers (DCAN1–3) operating at up to 1 Mbps. The internal crossbar and dedicated DMA channels prevent bus contention, enabling RM46L440CZWTT to serve as a safety gateway bridging industrial Ethernet networks and CAN-based field devices.

What is the maximum ADC sampling rate achievable with RM46L440CZWTT's MibADC modules?

RM46L440CZWTT's two 12-bit MibADC modules support up to 5 MSPS aggregate sampling rate when configured in interleaved mode across all 24 shared channels. Each MibADC has 64-word parity-protected result buffers, and conversion triggers can be synchronized to ePWM events or N2HET timers - enabling precise current/voltage sampling aligned with motor switching cycles.

Can RM46L440CZWTT's N2HET modules replace external FPGA-based timing logic?

Yes, RM46L440CZWTT's two N2HET modules (N2HET1 with 32 channels, N2HET2 with 18 channels) provide programmable microcode-based timing with hardware angle generation and HTU DMA transfers. They eliminate need for external FPGAs in applications like multi-phase motor commutation, LED dimming sequences, or sensor pulse decoding - reducing BOM cost and board area while maintaining sub-microsecond timing precision.

Is RM46L440CZWTT pin-compatible with other RM46Lx40 variants in ZWT package?

Yes, RM46L440CZWTT is fully pin-compatible with RM46L840CZWTT and RM46L440PGE in the same ZWT package footprint. All ZWT variants share identical ball map, power sequencing, and peripheral pin assignments - allowing hardware reuse across performance tiers and memory configurations without PCB redesign.