Texas Instruments RM46L840CZWTT

Overview

RM46L840CZWTT from Texas Instruments is a safety-certified 32-bit ARM Cortex-R4F microcontroller designed for high-integrity industrial and medical systems. It delivers 332 DMIPS at 200 MHz, integrates 1.25 MB flash with ECC, 192 KB RAM with ECC, dual lockstep CPUs, and supports IEEE 802.3 Ethernet, three CAN 2.0B controllers, and dual 12-bit MibADCs with 24 total channels - deployed in ventilators, safe PLCs, and radiation therapy systems.

For engineers reviewing the RM46L840CZWTT datasheet, RM46L840CZWTT pinout, RM46L840CZWTT application, or RM46L840CZWTT equivalent, key selection criteria include functional safety compliance (ISO 26262 ASIL-D capable), dual-CPU lockstep architecture, ECC-protected memory hierarchy, N2HET timing coprocessor support, and 337-ball ZWT BGA package compatibility with industrial thermal and EMI requirements.

Technical Context

The RM46L840CZWTT implements a dual-core lockstep execution model where both Cortex-R4F CPUs run identical instructions and compare results in real time, triggering error signaling via the Error Signaling Module (ESM) and nERROR pin upon mismatch. Its safety infrastructure includes on-chip BIST for CPU and SRAM, parity protection on peripheral memories, and loopback-capable I/O for diagnostic coverage.

Timing-critical control is offloaded to two Next Generation High-End Timer (N2HET) modules - N2HET1 with 32 programmable channels and N2HET2 with 18 - each featuring dedicated HTU DMA engines, hardware angle generators, and programmable micromachine logic. These operate independently of the CPU to manage ePWM synchronization, encoder capture, and complex waveform generation with sub-microsecond precision.

Key Specifications

Pinout & Package

RM46L840CZWTT is housed in a 337-ball fine-pitch NFBGA (ZWT) package with 16 mm × 16 mm body size and 0.8 mm ball pitch. The package supports industrial-grade thermal performance and mechanical reliability under vibration and thermal cycling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with RM46L840CZWTT, RM46L852ZWT trades EMIF for USB capability at higher clock speed, while RM48L952ZWT extends memory, trace, and interface headroom - both retain identical safety mechanisms and N2HET/ePWM peripheral sets for drop-in functional continuity in safety-critical control layers.

Availability

RM46L840CZWTT is available at Aetrix Electronics and suitable for industrial safety PLCs, medical ventilators, wind turbine pitch control, and radiation therapy systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for ISO 13485 and IEC 61508 compliance.

Supply support for RM46L840CZWTT 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 deep expertise in functional safety and industrial-grade reliability.

The RM46Lx40 product line was engineered specifically for ASIL-D and SIL-3 safety-critical applications - integrating lockstep CPUs, ECC memory, BIST, and diagnostic peripherals to reduce system-level certification effort in medical, energy, and automation markets.

FAQ

What safety certifications does the RM46L840CZWTT support?

The RM46L840CZWTT supports ISO 26262 ASIL-D and IEC 61508 SIL-3 compliance through its dual lockstep Cortex-R4F CPUs, on-chip BIST, ECC-protected flash and RAM, parity-protected peripheral memories, and Error Signaling Module (ESM). Texas Instruments provides certified safety manuals, FMEDA reports, and diagnostic software libraries specifically for RM46L840CZWTT to accelerate functional safety certification.

Does the RM46L840CZWTT include an external memory interface?

Yes, the RM46L840CZWTT includes a 16-bit External Memory Interface (EMIF) supporting asynchronous and synchronous memories. This interface is present in the RM46L840 variant and enables connection to external NOR flash, SRAM, or FPGA co-processors - confirmed in the device comparison table and Section 6.14 of the SPNS183C datasheet.

What is the maximum operating temperature range for the RM46L840CZWTT?

The RM46L840CZWTT is rated for operation from –40°C to +105°C ambient temperature, as specified in Table 3-1 (Device Comparison) and Section 5.4 (Recommended Operating Conditions) of the SPNS183C datasheet. This industrial temperature grade supports deployment in turbine nacelles, medical equipment enclosures, and factory-floor control cabinets.

How many CAN controllers are integrated into the RM46L840CZWTT?

The RM46L840CZWTT integrates three fully compliant Controller Area Network (DCAN) modules supporting CAN protocol version 2.0A and 2.0B at up to 1 Mbps. Each DCAN includes 64 mailboxes with parity protection and operates independently - verified in Section 1.1 Features and Table 3-1 of the SPNS183C datasheet.

Is the RM46L840CZWTT pin-compatible with other RM46Lx40 variants in the ZWT package?

Yes, all RM46Lx40 devices in the ZWT package (including RM46L840ZWT, RM46L852ZWT, and RM46L440ZWT) share identical ball mapping and mechanical footprint. Pin compatibility is explicitly confirmed in Table 1-1 and Section 4.2 (ZWT BGA Package Ball-Map) of the SPNS183C datasheet, enabling hardware reuse across performance tiers.