Texas Instruments RM48L952DZWTT

Overview

RM48L952DZWTT from Texas Instruments is a safety-certified 32-bit ARM Cortex-R4F microcontroller with dual lockstep CPUs, 3 MB flash (ECC-protected), 256 KB RAM (ECC-protected), and integrated peripherals including three DCAN controllers, two 12-bit MibADCs (24 total channels), two N2HET timing coprocessors, 10/100 Mbps EMAC, USB 2.0 host/device, and IEEE 802.3-compliant Ethernet - designed for industrial safety PLCs and medical ventilators.

For engineers reviewing the RM48L952DZWTT datasheet, RM48L952DZWTT pinout, RM48L952DZWTT application, or RM48L952DZWTT equivalent, this page delivers verified technical context, package-specific pin mapping (337-ball NFBGA, ZWT), functional safety architecture details (BIST, ECC, error signaling), and real-world deployment guidance for IEC 61508 SIL-3 and ISO 26262 ASIL-D systems.

Technical Context

The RM48L952DZWTT implements a dual-CPU lockstep architecture with built-in BIST for CPU and on-chip RAMs, ECC on flash and SRAM, parity protection on peripheral memories, and dedicated Error Signaling Module (ESM) with external ERROR pin. Its FMPLL clock system supports up to 220 MHz operation with slip detection and separate nonmodulating PLL.

Peripheral subsystems include two N2HET modules (N2HET1: 32 channels; N2HET2: 18 channels), each with dedicated HTU and MPU; two 12-bit MibADCs sharing 16 channels and providing 64-word parity-protected buffers; and a 16-bit External Memory Interface (EMIF) supporting SDRAM, asynchronous memory, and FPGA interfacing.

Key Specifications

Pinout & Package

NFBGA-337 (ZWT) package: 16.0 mm × 16.0 mm body, 0.8 mm ball pitch, green RoHS-compliant. Ball map includes dedicated power/ground banks, EMIF interface (EMIF_ADDR[21:0], EMIF_DATA[15:0], EMIF_nCS[4:0]), dual N2HET banks (N2HET1[31:0], N2HET2[17:0]), and multiplexed peripheral I/O (DCAN, USB, EMAC, MibSPI, ADC inputs).

Key Features

Applications

Equivalent & Alternatives

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

Compared with RM48L952DZWTT, RM48L950ZWT sacrifices Ethernet and flash capacity for lower cost, while RM46L852ZWT reduces memory, peripheral count, and safety certification scope - making RM48L952DZWTT the only option supporting full SIL-3/ASIL-D with integrated EMAC, USB host, and maximum memory.

Availability

RM48L952DZWTT is available at Aetrix Electronics and suitable for industrial safety PLCs, medical ventilators, power generation monitoring, and robotic surgery systems requiring stable component supply, long-term lifecycle assurance, and automotive-grade reliability.

Supply support for RM48L952DZWTT 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 processing technologies with decades of automotive and industrial safety IC experience.

The RM48L952DZWTT belongs to TI's Hercules™ ARM-based safety microcontroller family, engineered specifically for IEC 61508 SIL-3 and ISO 26262 ASIL-D applications requiring hardware redundancy, memory integrity, and deterministic real-time control.

FAQ

What safety certifications does the RM48L952DZWTT support?

The RM48L952DZWTT is architected to support IEC 61508 SIL-3 and ISO 26262 ASIL-D compliance. It achieves this through dual lockstep CPUs, ECC on flash and RAM, BIST for CPU and memory, parity on peripheral RAMs, and an Error Signaling Module with external ERROR pin. TI provides safety manuals, FMEDA reports, and diagnostic software libraries to aid certification - all required documentation is validated for RM48L952DZWTT specifically, not extrapolated from other family members.

Does the RM48L952DZWTT include an integrated Ethernet PHY?

No, the RM48L952DZWTT integrates only the Ethernet Media Access Controller (EMAC), not the physical layer (PHY). It supports MII, RMII, and MDIO interfaces to connect to external PHYs such as the DP83848 or LAN8742A. This separation allows design flexibility in selecting PHYs optimized for noise immunity, power, or isolation - critical in industrial environments where RM48L952DZWTT is deployed.

How many ADC input channels does the RM48L952DZWTT support, and how are they allocated?

The RM48L952DZWTT integrates two 12-bit Multibuffered ADCs (MibADC1 and MibADC2) with a total of 24 unique analog inputs. MibADC1 supports 24 channels (AD1IN[0]–AD1IN[23]), while MibADC2 supports 16 channels (AD2IN[0]–AD2IN[15]), with 16 channels shared between both modules. Channel allocation is configured via register settings, and conversion sequences can be triggered individually or grouped for synchronized sampling - essential for motor control and sensor fusion in RM48L952DZWTT applications.

What is the purpose of the Parameter Overlay Module (POM) in the RM48L952DZWTT?

The Parameter Overlay Module (POM) in the RM48L952DZWTT enables dynamic rerouting of flash memory accesses to internal RAM or external EMIF addresses during runtime. This allows calibration tables and control parameters to be updated in RAM without halting the CPU or reprogramming flash - preserving system uptime and meeting strict safety requirements for zero-interrupt-latency parameter adjustment. POM is fully supported in RM48L952DZWTT's memory map and requires no external components.

Can the RM48L952DZWTT operate without an external crystal oscillator?

No - the RM48L952DZWTT requires an external crystal (typically 20 MHz) connected to OSCIN/OSCOUT pins for reliable operation in safety-critical modes. While internal oscillators exist, TI's safety documentation explicitly prohibits their use in SIL-3/ASIL-D configurations due to insufficient stability and fault coverage. The RM48L952DZWTT's clock monitoring circuitry validates external crystal operation and triggers ESM faults if frequency deviation exceeds ±2%, ensuring RM48L952DZWTT maintains certified timing integrity.