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Texas Instruments RM46L440ZWTT
- Part No.:
- RM46L440ZWTT
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 337-LFBGA
- Datasheet:
-
RM46L440ZWTT.pdf
- Description:
- IC MCU 16/32B 1MB FLASH 337NFBGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,856
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Product details
Overview
RM46L440ZWTT from Texas Instruments is a safety-certified 32-bit ARM Cortex-R4F microcontroller for industrial and medical safety-critical systems. It features dual lockstep CPUs, 1MB flash with ECC, 128KB RAM with ECC, 200-MHz operation, three CAN 2.0B controllers, and integrated N2HET timing coprocessors - deployed in ventilators, safe PLCs, and radiation therapy equipment.
For engineers reviewing the RM46L440ZWTT datasheet, RM46L440ZWTT pinout, RM46L440ZWTT application, or RM46L440ZWTT equivalent, this page delivers verified technical context, real-world use cases, pin-level design meaning, and validated alternative options - all grounded in TI's SPNS183C production data sheet and ZWT package documentation.
Technical Context
The RM46L440ZWTT implements a dual-CPU lockstep architecture with BIST, ECC on flash/RAM, parity-protected peripheral memories, and loopback I/O for ISO 26262/IEC 61508 compliance. Its two N2HET modules (32 + 18 programmable channels) offload real-time timing tasks including PWM generation, encoder capture, and complex pulse sequencing without CPU intervention.
It integrates two 12-bit MibADCs (24 total inputs, 64-word parity-protected buffers each), three DCAN controllers supporting up to 1 Mbps, 10/100 Ethernet MAC with MII/RMII/MDIO, and a Frequency-Modulated PLL with slip detection - all operating under 1.14–1.32 V core and 3.0–3.6 V I/O supply conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-R4F, 200 MHz max, 332 DMIPS, FPU with single/double precision |
| Memory | 1MB program flash with ECC; 128KB RAM with ECC; 64KB emulated EEPROM with ECC |
| Safety Features | Dual lockstep CPUs, CPU/RAM BIST, ECC on flash/RAM, parity on peripheral RAMs, error signaling module with nERROR pin |
| Timing Peripherals | 2× N2HET (32 + 18 channels), 7× ePWM, 6× eCAP, 2× eQEP, RTI timer, 128-channel VIM |
| Analog & Comm | 2× 12-bit MibADC (24 ch, 64-word buffers), 3× DCAN, 1× EMAC, 3× MibSPI, 2× SPI, 2× SCI (1 with LIN 2.1), 1× I2C |
| Package & Power | NFBGA-337 (16 mm × 16 mm); core voltage 1.14–1.32 V; I/O voltage 3.0–3.6 V; operating temp –40°C to 105°C |
Pinout & Package
NFBGA-337 (ZWT) package: 16.0 mm × 16.0 mm body size, 0.8 mm ball pitch, green RoHS-compliant construction. Ball map supports full I/O multiplexing per TI SPNS183C Section 4.2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSS / VCC / VCCIO / VCCAD / VSSAD | Power and ground domains | Separate supplies for core (1.14–1.32 V), I/O (3.0–3.6 V), and ADC (3.3 V analog reference); dedicated analog ground plane required |
| nPORRST / nRST / nERROR | Reset and fault signaling | Power-on reset input, warm reset input, and open-drain fault output - critical for safety system diagnostics and fail-safe shutdown |
| OSCIN / OSCOUT | Crystal oscillator interface | Supports external crystal or clock source (1–25 MHz) for FMPLL clock generation; requires external load capacitors |
| N2HET1[31:0] / N2HET2[17:0] | High-end timer I/O | 50 total programmable N2HET pins - used for PWM, capture, GPIO, or angle generation; HTU enables DMA-style memory transfers |
| AD1IN[0:23] / AD2IN[0:15] / AD1EVT / AD2EVT | Analog input and trigger | 24 shared analog inputs across two ADCs; event-triggered conversion enables precise synchronization with PWM or encoder events |
| CAN1_RX/TX / CAN2_RX/TX / CAN3_RX/TX | CAN bus interface | Three independent CAN 2.0A/B controllers with 64 mailboxes each - supports distributed control in noisy industrial environments |
Key Features
| Feature | Design Value |
|---|---|
| Dual lockstep Cortex-R4F CPUs | Hardware-level redundancy enabling continuous comparison and fault detection - foundational for ASIL-D and SIL-3 certification |
| ECC-protected 1MB flash & 128KB RAM | Single-bit error correction and double-bit error detection ensures data integrity over lifetime in harsh thermal/electrical environments |
| Two N2HET timing coprocessors | Offloads deterministic real-time timing (e.g., motor commutation, sensor sampling) from main CPU - reduces jitter and improves predictability |
| Integrated EMAC with MII/RMII support | Enables deterministic Ethernet communication for time-sensitive networking (TSN)-capable industrial controllers without external PHY dependency |
| Parameter Overlay Module (POM) | Allows runtime calibration parameter updates via RAM remapping - eliminates flash reprogramming during field calibration or firmware patching |
Applications
| Industrial Safety PLCs | Ventilator Control Systems |
|---|---|
Use Scenario: Real-time monitoring of emergency stop circuits, safety gate interlocks, and redundant sensor inputs in factory automation. IC Role / Device Role / Timing Role: Primary safety controller executing certified runtime diagnostics, lockstep CPU validation, and fail-safe output activation within <50 µs response window. Use Value: Meets IEC 61508 SIL-3 requirements via hardware-enforced redundancy, ECC memory, and error signaling on nERROR pin. |
Use Scenario: Closed-loop pressure and flow control in Class II medical ventilators requiring FDA 510(k) clearance. IC Role / Device Role / Timing Role: Central controller managing BLDC motor drives, pressure transducer sampling, and alarm logic with dual-CPU fault coverage. Use Value: Integrated ePWM deadband, eQEP for motor position, and MibADC synchronized sampling enable sub-millisecond respiratory cycle timing. |
| Radiation Therapy Beam Control | Wind Turbine Pitch & Brake Systems |
Use Scenario: Precision actuation of collimators and beam-shaping devices where single-point failure must not cause overdose. IC Role / Device Role / Timing Role: Safety-critical motion controller interfacing with servo drives, encoders, and radiation sensors using eQEP and eCAP modules. Use Value: N2HET-based pulse generation ensures deterministic timing for beam gating; ECC memory prevents latent corruption in long-duration treatments. |
Use Scenario: Redundant pitch control and emergency braking in offshore wind turbines exposed to wide temperature swings and EMI. IC Role / Device Role / Timing Role: Dual-core controller executing independent pitch algorithms while cross-checking results and triggering mechanical brake on mismatch. Use Value: Built-in BIST, voltage/clock monitoring, and nERROR pin integration simplify functional safety architecture for IEC 61400-25 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar safety microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RM46L840ZWTT | 1.25MB flash, 192KB RAM, same peripherals and safety architecture | Higher memory capacity for larger safety firmware or dual-application partitioning | Select when extended code space or additional RAM for diagnostic logging is required |
| RM48L952ZWT | 220 MHz CPU, 3MB flash, USB OHCI + EMAC, no eQEP, different N2HET channel count (44 vs 44) | Targeted at higher-performance safety gateway or HMI-integrated controllers | Choose for USB host capability and increased processing headroom - verify N2HET pin compatibility for legacy designs |
Compared with RM46L440ZWTT, RM46L840ZWTT offers more memory for complex safety stacks, while RM48L952ZWT adds USB and higher clock speed but removes eQEP - making RM46L440ZWTT optimal for cost-sensitive, motor-control-dominant safety applications with strict pinout continuity.
Availability
RM46L440ZWTT is available at Aetrix Electronics and suitable for industrial safety PLCs, medical ventilators, radiation therapy systems, and wind turbine control requiring stable component supply across extended product lifecycles.
Supply support for RM46L440ZWTT 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 IC experience.
The RM46Lx40 product line was designed specifically for IEC 61508 and ISO 26262 functional safety applications - integrating lockstep CPUs, memory ECC, and self-test logic into a scalable MCU platform for medical, energy, and automation markets.
FAQ
What safety certifications does the RM46L440ZWTT support?
The RM46L440ZWTT is architected to support IEC 61508 SIL-3 and ISO 26262 ASIL-D compliance through dual lockstep CPUs, ECC memory, BIST, parity-protected peripherals, and error signaling. TI provides safety manuals, FMEDA reports, and diagnostic software libraries - but final certification is system-level and requires customer validation per target application standards. RM46L440ZWTT itself is not pre-certified.
Does the RM46L440ZWTT include hardware floating-point support?
Yes, the RM46L440ZWTT integrates an ARM Cortex-R4F CPU with full single- and double-precision floating-point unit (FPU), enabling efficient execution of control algorithms, filtering, and mathematical functions without software emulation overhead - critical for real-time motor and medical control loops.
What is the maximum operating frequency of the RM46L440ZWTT?
The RM46L440ZWTT operates at up to 200 MHz system clock frequency, delivering 332 DMIPS performance. This frequency is supported across the full industrial temperature range (–40°C to 105°C) under specified 1.14–1.32 V core supply conditions, as confirmed in TI SPNS183C Section 5.4.
Can the RM46L440ZWTT replace the RM46L840ZWTT in an existing design?
RM46L440ZWTT and RM46L840ZWTT share identical pinout, peripherals, and safety architecture, differing only in memory size (1MB/128KB vs 1.25MB/192KB). Pin-compatible replacement is feasible if application firmware fits within RM46L440ZWTT's reduced memory - but verify linker script, diagnostic memory allocation, and flash layout constraints before substitution.
Which communication interfaces does the RM46L440ZWTT support for industrial networking?
The RM46L440ZWTT supports three CAN 2.0B controllers (up to 1 Mbps), 10/100 Ethernet MAC with MII/RMII/MDIO, three MibSPI, two standard SPI, two SCI (one with LIN 2.1), and one I2C - enabling robust multi-protocol industrial networking in electrically noisy environments such as factory floors or wind turbine nacelles.
RM46L440ZWTT 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:
- 200MHz
- Connectivity:
- CANbus, EBI/EMI, Ethernet, I2C, LINbus, MibSPI, SCI, SPI, UART/USART
- Peripherals:
- DMA, POR, PWM, WDT
- Number of I/O:
- 101
- Program Memory Size:
- 1MB (1M x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 64K x 8
- RAM Size:
- 128K 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:
RM46L440ZWTT FAQ
1.How can I place an order for RM46L440ZWTT through Aetrix?
Please submit a Request for Quotation (RFQ) for RM46L440ZWTT 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 RM46L440ZWTT reliable?
The price and inventory of RM46L440ZWTT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RM46L440ZWTT is usually 5 days.
3.What payment methods are accepted for RM46L440ZWTT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RM46L440ZWTT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RM46L440ZWTT?
RM46L440ZWTT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RM46L440ZWTT 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 RM46L440ZWTT?
For technical support, including RM46L440ZWTT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RM46L440ZWTT requirements.
6.How does Aetrix verify that RM46L440ZWTT is sourced from the original manufacturer or authorized distributors?
All RM46L440ZWTT 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 RM46L440ZWTT meets industry standards.
7.What is the process for return or replacement of RM46L440ZWTT?
All RM46L440ZWTT units undergo pre-shipment inspection (PSI). If there is an issue with RM46L440ZWTT, 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 RM46L440ZWTT part is unused and in its original packaging.
Return procedure for RM46L440ZWTT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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