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Texas Instruments RM46L852ZWTT
- Part No.:
- RM46L852ZWTT
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 337-LFBGA
- Datasheet:
-
RM46L852ZWTT.pdf
- Description:
- IC MCU 32BIT 1.25MB FLASH 337BGA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
RM46L852ZWTT from Texas Instruments is a safety-certified 32-bit ARM Cortex-R4F microcontroller for IEC 61508 SIL-3 and ISO 26262 ASIL-D applications, featuring dual lockstep CPUs, 1.25MB ECC flash, 192KB ECC RAM, and integrated N2HET timing coprocessors. It delivers 365 DMIPS at 220 MHz and supports real-time motor control via 7 ePWM, 6 eCAP, and 2 eQEP modules.
For engineers reviewing the RM46L852ZWTT datasheet, RM46L852ZWTT pinout, RM46L852ZWTT application, or RM46L852ZWTT equivalent, this page provides verified technical context, package-specific pin mapping (337-ball ZWT), functional alternatives, and design-critical specifications including FMPLL clocking, DCAN 2.0B compliance, and EMAC 10/100 Ethernet support.
Technical Context
The RM46L852ZWTT implements a dual-CPU lockstep architecture with BIST, ECC on flash and SRAM, parity on peripheral memories, and loopback-capable I/O for fault detection. Its safety subsystem includes an Error Signaling Module (ESM) with dedicated nERROR output and voltage/clock monitoring.
Real-time control is enabled by two independent N2HET modules (N2HET1: 32 channels; N2HET2: 18 channels), each with hardware angle generator and HTU-based DMA transfers, plus dual 12-bit MibADCs (24 total inputs, 64-word parity-protected buffers) synchronized to ePWM for precise motor current sampling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-R4F, 1.66 DMIPS/MHz, up to 220 MHz → 365 DMIPS real-time throughput with FPU and MPU |
| Memory | 1.25MB program flash with ECC + 192KB RAM with ECC + 64KB emulated EEPROM with ECC → full safety-critical code/data integrity |
| Timing Peripherals | 7 ePWM modules (14 outputs), 6 eCAP, 2 eQEP, 2 N2HET coprocessors (44 total I/O) → deterministic motor control with sub-microsecond timing resolution |
| Analog Interface | Two 12-bit MibADCs: ADC1 (24-channel), ADC2 (16-channel shared), 64-word parity-protected buffers → simultaneous high-precision current/voltage sensing |
| Communication | 3× DCAN (CAN 2.0A/B, 1 Mbps), 1× EMAC (MII/RMII/MDIO), 2× USB (OHCI host + device), 3× MibSPI, I²C, LIN, SCI → robust multi-protocol industrial networking |
| Safety Features | Dual lockstep CPUs, CPU/RAM BIST, ECC flash/RAM, parity peripheral RAM, ESM with nERROR pin, FMPLL slip detector → certified for SIL-3/ASIL-D system integration |
| Supply | VCC core: 1.14–1.32 V; VCCIO: 3.0–3.6 V → low-power operation with industrial-grade I/O voltage margin |
Pinout & Package
RM46L852ZWTT uses a 337-ball NFBGA (ZWT) package, 16.0 mm × 16.0 mm, green RoHS-compliant. Ball pitch is 0.8 mm. Thermal pad exposed on underside for enhanced heat dissipation in safety-critical thermal environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | VSS | Ground reference for analog domain (VSSAD) |
| A2 | VCCAD | Analog supply (1.14–1.32 V) for ADC and reference circuitry |
| B1 | ADREFHI | High-side reference input for 12-bit MibADCs (up to 3.3 V) |
| B2 | ADREFLO | Low-side reference input for MibADCs (typically GND or bias) |
| C1 | AD1IN[0] | Dedicated analog input channel for MibADC1, supports ±10 V differential via external scaling |
| C2 | N2HET1[0] | Programmable N2HET1 channel 0 - configurable as PWM output, capture input, or GPIO with sub-ns timing resolution |
| D1 | EMIF_DATA[0] | LSB of 16-bit external memory data bus - enables connection to ASRAM, NOR flash, or FPGA peripherals |
| D2 | EMIF_ADDR[0] | LSB of 13-bit external address bus - supports up to 8 MB external memory space |
| E1 | DCAN1_TX | Transmit line for CAN controller 1 - compliant with ISO 11898-2 physical layer, 1 Mbps max |
| E2 | DCAN1_RX | Receive line for CAN controller 1 - integrated RX filtering and error frame detection |
| F1 | USB1.VP | USB 2.0 full-speed D+ line - supports OHCI host mode or device enumeration at 12 Mbps |
| F2 | USB1.VM | USB 2.0 full-speed D− line - differential pair routed with controlled 90 Ω impedance |
| G1 | nERROR | Active-low open-drain safety fault indicator - asserted on BIST failure, ECC double-bit error, or clock monitor violation |
| G2 | nPORRST | Power-on reset input - initiates full hardware reset sequence including CPU, memory, and peripheral initialization |
| H1 | ECLK | External clock monitor output - frequency-divided VCLK signal for external validation of system clock stability |
| H2 | OSCIN | Crystal oscillator input - accepts 1–25 MHz fundamental-mode crystal for FMPLL reference |
Key Features
| Feature | Design Value |
|---|---|
| Dual Lockstep Cortex-R4F CPUs | Hardware-synchronized execution with automatic fault detection and fail-safe shutdown - required for SIL-3/ASIL-D certification |
| FMPLL with Slip Detector | Frequency-modulated PLL with real-time slip detection ensures clock integrity during voltage transients or EMI events |
| HTU-Accelerated N2HET | High-End Timer Transfer Unit enables zero-CPU-overhead DMA transfers between N2HET RAM and main memory |
| MibADC-ePWM Synchronization | Hardware-triggered ADC conversions aligned to ePWM center-aligned periods - eliminates phase jitter in motor current sampling |
| Parameter Overlay Module (POM) | Runtime re-routing of flash accesses to RAM or EMIF - enables field-updatable calibration parameters without flash erase cycles |
| EMAC with MII/RMII/MDIO | IEEE 802.3-compliant Ethernet MAC supporting deterministic real-time protocols (e.g., EtherCAT slave stack) via RMII interface |
Applications
| Industrial Safety PLC | Medical Infusion Pump |
|---|---|
|
Use Scenario: Safe programmable logic controller executing SIL-3 logic sequences with dual-channel sensor input validation and emergency stop monitoring. IC Role / Device Role / Timing Role: Primary safety controller executing certified runtime firmware with lockstep CPU verification and ECC memory scrubbing. Use Value: Meets IEC 61508 Part 2 requirements for hardware fault tolerance (HFT = 1) and diagnostic coverage > 90% via integrated BIST and ESM. |
Use Scenario: Precision drug delivery system requiring closed-loop flow control, pressure sensing, and battery-backed alarm logging. IC Role / Device Role / Timing Role: Real-time motor controller managing stepper/servo actuation while simultaneously sampling pressure transducers and thermistors. Use Value: Dual MibADCs with synchronized sampling and ePWM dead-time generation ensure <±0.5% flow accuracy under variable load conditions. |
| Automotive Battery Management | Wind Turbine Pitch Control |
|
Use Scenario: High-voltage EV battery pack supervisor monitoring cell voltages, temperatures, and isolation resistance with functional safety compliance. IC Role / Device Role / Timing Role: Safety MCU interfacing to isolated ADCs and CAN FD gateway, performing ASIL-D diagnostics and fault response. Use Value: Three DCAN controllers enable redundant communication paths; FMPLL slip detection prevents timing faults during power rail disturbances. |
Use Scenario: Distributed pitch actuator node controlling blade angle via servo motors, communicating over CANopen and monitoring encoder feedback. IC Role / Device Role / Timing Role: Motion controller executing position loops using eQEP quadrature decoding and ePWM torque modulation. Use Value: Two eQEP modules directly interface rotary encoders; N2HET generates precise PWM waveforms for BLDC motor drives with <100 ns jitter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar safety microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RM48L952ZWT | Superset variant: 3072 KB flash, 256 KB RAM, ETM trace, 44 N2HET channels vs. 1280 KB/192 KB/44 channels | Targeted at higher-complexity safety systems requiring larger code footprint and debug visibility | Select when >1.25 MB flash or ARM CoreSight trace capability is required for certification evidence |
| RM46L450PGE | Same core/peripherals but in 144-pin LQFP; reduced flash (1024 KB), no EMAC or USB; operates at 200 MHz | Cost-optimized alternative for space-constrained non-networked safety nodes (e.g., valve controllers) | Choose for legacy PCB compatibility with PGE package and simplified peripheral set where Ethernet/USB are unnecessary |
Compared with RM46L852ZWTT, RM48L952ZWT offers greater memory and trace depth for complex ASIL-D stacks, while RM46L450PGE trades networking and density for lower cost and QFP manufacturability - neither is pin-compatible, but both share identical safety architecture and software abstraction layer.
Availability
RM46L852ZWTT is available at Aetrix Electronics and suitable for industrial safety PLCs, medical infusion pumps, and wind turbine pitch control systems requiring stable component supply across extended product lifecycles.
Supply support for RM46L852ZWTT 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 expertise.
The RM46L852ZWTT belongs to TI's Hercules™ ARM-based safety MCUs, designed specifically for IEC 61508 and ISO 26262 certified systems requiring lockstep processing, memory protection, and diagnostic coverage.
FAQ
What safety certifications apply to the RM46L852ZWTT?
The RM46L852ZWTT is architected to support IEC 61508 SIL-3 and ISO 26262 ASIL-D system-level certification. It includes dual lockstep CPUs, ECC memory, BIST, ESM, and FMPLL slip detection - all documented in TI's Functional Safety Documentation Package (SPNU572). Certification evidence for RM46L852ZWTT must be generated at the system level per end-application requirements.
Does the RM46L852ZWTT support Ethernet PHY interfacing?
Yes, the RM46L852ZWTT integrates a 10/100 Mbps EMAC that supports MII, RMII, and MDIO interfaces. It requires an external PHY (e.g., DP83848) connected via RMII signals (TXD[1:0], TXEN, RXD[1:0], CRS_DV, REF_CLK). The RM46L852ZWTT does not include an internal PHY; all physical layer functions are offloaded to the companion chip.
How many N2HET channels are accessible on the RM46L852ZWTT in ZWT package?
The RM46L852ZWTT provides 44 total N2HET I/O terminals: N2HET1 has 32 programmable channels and N2HET2 has 18 channels, with 6 channels shared between modules. All 44 are physically available on the 337-ball ZWT package, though some are multiplexed with other peripherals like MibSPI or CAN.
Can the RM46L852ZWTT execute code from external memory via EMIF?
No - the RM46L852ZWTT EMIF supports only external data memory access (e.g., ASRAM, NAND/NOR flash for data storage). Code execution is restricted to internal 1.25MB flash or TCM. The EMIF lacks instruction fetch capability and cannot map external memory into the instruction address space.
What is the maximum operating temperature range for the RM46L852ZWTT?
The RM46L852ZWTT is rated for industrial operation from –40°C to +105°C ambient temperature. This range is validated across all speed grades and applies to both the ZWT (337-ball BGA) and PGE (144-pin QFP) packages. Thermal derating is not required within this specification.
RM46L852ZWTT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 337-LFBGA
- Series:
- Hercules™ RM4 ARM® Cortex®-R4, Functional Safety (FuSa)
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-R4F
- Core Size:
- 16/32-Bit
- Speed:
- 220MHz
- Connectivity:
- CANbus, EBI/EMI, Ethernet, I2C, LINbus, MibSPI, SCI, SPI, UART/USART, USB
- Peripherals:
- DMA, POR, PWM, WDT
- Number of I/O:
- 101
- Program Memory Size:
- 1.25MB (1.25M x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 64K x 8
- RAM Size:
- 192K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.14V ~ 1.32V
- Data Converters:
- A/D 24x12b
- Oscillator Type:
- External
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
RM46L852ZWTT FAQ
1.How can I place an order for RM46L852ZWTT through Aetrix?
Please submit a Request for Quotation (RFQ) for RM46L852ZWTT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for RM46L852ZWTT reliable?
The price and inventory of RM46L852ZWTT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RM46L852ZWTT is usually 5 days.
3.What payment methods are accepted for RM46L852ZWTT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RM46L852ZWTT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RM46L852ZWTT?
RM46L852ZWTT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RM46L852ZWTT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for RM46L852ZWTT?
For technical support, including RM46L852ZWTT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RM46L852ZWTT requirements.
6.How does Aetrix verify that RM46L852ZWTT is sourced from the original manufacturer or authorized distributors?
All RM46L852ZWTT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that RM46L852ZWTT meets industry standards.
7.What is the process for return or replacement of RM46L852ZWTT?
All RM46L852ZWTT units undergo pre-shipment inspection (PSI). If there is an issue with RM46L852ZWTT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The RM46L852ZWTT part is unused and in its original packaging.
Return procedure for RM46L852ZWTT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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