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Texas Instruments RM46L840ZWTT
- Part No.:
- RM46L840ZWTT
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 337-LFBGA
- Datasheet:
-
RM46L840ZWTT.pdf
- Description:
- IC MCU 32BIT 1.25MB FLASH 337BGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,770
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Product details
Overview
RM46L840ZWTT from Texas Instruments is a safety-certified 32-bit ARM Cortex-R4F microcontroller for functional safety-critical systems, featuring dual lockstep CPUs, 1.25MB ECC flash, 192KB ECC RAM, 200-MHz operation, and integrated N2HET timing coprocessors. It targets industrial PLCs, medical ventilators, and motor control where ASIL-D or SIL-3 compliance is required.
For engineers reviewing the RM46L840ZWTT datasheet, RM46L840ZWTT pinout, RM46L840ZWTT application, or RM46L840ZWTT equivalent, this page delivers verified technical context, safety architecture details, real-time peripheral specifications (ePWM/eCAP/N2HET), package-specific terminal mapping, and validated alternative options for safety-critical design reuse.
Technical Context
The RM46L840ZWTT implements a dual-CPU lockstep architecture with BIST, ECC on flash and SRAM, parity on peripheral memories, and error signaling via dedicated nERROR pin - all meeting IEC 61508 SIL-3 and ISO 26262 ASIL-D requirements. Its FMPLL and nonmodulating PLL provide robust clock generation with slip detection and voltage monitoring.
Real-time control is enabled by two N2HET modules (32 + 18 programmable channels), seven ePWM modules with deadband and trip-zone protection, six eCAP modules, two eQEP interfaces, and dual 12-bit MibADCs (24 total inputs, 64-word parity-protected buffers each). The EMAC supports IEEE 802.3-compliant 10/100 Mbps Ethernet with MII/RMII/MDIO.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-R4F, 200 MHz, 332 DMIPS, FPU with single/double precision, 12-region MPU |
| Memory | 1.25 MB program flash with ECC; 192 KB data RAM with ECC; 64 KB emulated EEPROM with ECC |
| Safety Features | Dual lockstep CPUs; CPU and RAM BIST; ECC on flash/RAM; parity on peripheral RAMs; loopback I/O |
| Timing Peripherals | 2 × N2HET (32 + 18 channels); 7 × ePWM (14 outputs); 6 × eCAP; 2 × eQEP; RTI timer; 128-channel VIM |
| Analog & Comm | 2 × 12-bit MibADC (24 ch, 64-word buffers); 3 × DCAN (CAN 2.0A/B, 1 Mbps); EMAC (10/100 Mbps); 3 × MibSPI; I²C; LIN/SCI |
| Supply & Temp | VCC core: 1.14–1.32 V; VCCIO: 3.0–3.6 V; operating temperature: –40°C to +105°C |
| Package | 337-ball NFBGA (ZWT), 16.0 mm × 16.0 mm, RoHS-compliant green package |
Pinout & Package
RM46L840ZWTT is housed in a 337-ball NFBGA (ZWT) package with 0.8-mm ball pitch and thermal pad. Pin functions are multiplexed across GIO, N2HET, ADC, CAN, SPI, EMAC, and debug interfaces. Ball assignments follow TI's ZWT top-view map (Figure 4-2), with default I/O states defined during reset and configurable via IOMM registers.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | VSS | Ground reference for analog domain (VSSAD) |
| B2 | ADREFHI | High reference voltage input for both MibADC1 and MibADC2 |
| C3 | ADREFLO | Low reference voltage input for both MibADC1 and MibADC2 |
| D4 | VCCAD | 3.3-V analog supply for ADC circuitry |
| E5 | AD1IN[0] | Dedicated analog input channel for MibADC1 |
| F6 | N2HET1[0] | Programmable N2HET1 channel 0, supports PWM/capture/GPIO |
| G7 | CAN1TX | Transmit output for DCAN1 controller (CAN 2.0B compliant) |
| H8 | CAN1RX | Receive input for DCAN1 controller with built-in filtering |
| J9 | MIBSPI3CLK | Master clock output for MibSPI3 interface (programmable baud rate) |
| K10 | nERROR | Open-drain active-low fault indicator asserted by ESM on detected error |
| L11 | nPORRST | Power-on reset input; initiates full device initialization sequence |
| M12 | ECLK | External clock monitor output (ECP-derived), used for frequency verification |
Key Features
| Feature | Design Value |
|---|---|
| Dual Lockstep Cortex-R4F CPUs | Hardware-enforced instruction-level redundancy with continuous comparison and error reporting |
| ECC Memory Protection | Single-bit correction / double-bit detection on 1.25MB flash and 192KB RAM prevents silent data corruption |
| N2HET Timing Coprocessor | Two independent high-end timers (32 + 18 channels) offload complex real-time waveform generation from CPU |
| ePWM with Trip-Zone Protection | Seven modules support high-side/low-side gate drive with hardware-triggered shutdown for motor safety |
| EMAC with MII/RMII Support | IEEE 802.3-compliant Ethernet interface enables deterministic networked safety communication |
| Parameter Overlay Module (POM) | Enables runtime calibration parameter updates without flash reprogramming or system interruption |
Applications
| Industrial Safety PLC | Medical Ventilator Control |
|---|---|
Use Scenario: Real-time logic execution and I/O monitoring in certified safety PLCs for factory automation. IC Role / Device Role / Timing Role: Primary safety controller executing SIL-3 logic with lockstep CPU validation and diagnostic coverage. Use Value: Meets IEC 61508 Part 2 requirements via integrated BIST, ECC, and error signaling - eliminating need for external safety monitors. |
Use Scenario: Closed-loop pressure and flow control in life-support ventilators requiring ASIL-D compliance. IC Role / Device Role / Timing Role: Central safety MCU managing motor drivers, ADC sampling, and CAN-based alarm networks. Use Value: Dual ePWM modules with synchronized deadband and trip zones ensure fail-safe actuator control during fault conditions. |
| Wind Turbine Pitch Control | Robotic Surgery Actuation |
Use Scenario: High-reliability pitch angle adjustment using servo motors in offshore wind turbines. IC Role / Device Role / Timing Role: Real-time motion controller interfacing with eQEP encoders and driving ePWM-driven inverters. Use Value: N2HET modules generate precise, jitter-free PWM waveforms for BLDC motor commutation under variable load. |
Use Scenario: Sub-millisecond position and torque control in robotic surgical arms with force feedback. IC Role / Device Role / Timing Role: Deterministic timing engine synchronizing eCAP-based sensor capture, MibADC sampling, and ePWM actuation. Use Value: 128-channel VIM and RTI timer enable <1 µs interrupt latency for time-critical haptic response loops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar safety microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RM46L852ZWTT | Same ZWT package; higher 220-MHz CPU speed; identical memory and peripheral set | Supports tighter real-time deadlines in motor control; requires updated clock tree configuration | Select when >200 MHz deterministic performance is needed without changing PCB layout |
| RM46L440ZWTT | Same ZWT package; reduced 1 MB flash and 128 KB RAM; otherwise identical safety architecture | Suitable for cost-optimized safety nodes with smaller firmware footprint and lower memory bandwidth needs | Choose for legacy design migration or resource-constrained safety subsystems where 192 KB RAM is not required |
Compared with RM46L840ZWTT, RM46L852ZWTT offers higher CPU throughput for compute-intensive safety tasks, while RM46L440ZWTT reduces memory cost without compromising lockstep integrity or peripheral functionality - enabling scalable safety MCU deployment across product tiers.
Availability
RM46L840ZWTT is available at Aetrix Electronics and suitable for industrial safety PLCs, medical ventilators, wind turbine controls, and robotic surgery systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for IEC 61508/ISO 26262 certification.
Supply support for RM46L840ZWTT 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 over 50 years of innovation in industrial and automotive markets.
The RM46Lx40 product line was designed specifically for functional safety applications demanding SIL-3 or ASIL-D compliance, integrating hardware safety mechanisms directly into the microcontroller architecture rather than relying on external monitors.
FAQ
What safety certifications does the RM46L840ZWTT support?
The RM46L840ZWTT supports IEC 61508 SIL-3 and ISO 26262 ASIL-D compliance through its dual lockstep CPU, ECC memory, BIST logic, parity-protected peripherals, and error signaling module. TI provides certified safety documentation including FMEDA reports and safety manuals - all applicable to RM46L840ZWTT in ZWT packaging.
Does the RM46L840ZWTT support Ethernet communication?
Yes, the RM46L840ZWTT integrates a full IEEE 802.3-compliant 10/100 Mbps Ethernet MAC (EMAC) supporting MII, RMII, and MDIO interfaces. It enables deterministic networked safety communication in industrial control and medical devices - a capability confirmed in the RM46L840ZWTT datasheet Section 1.1 and Figure 1-1 block diagram.
How many ADC channels does the RM46L840ZWTT have?
The RM46L840ZWTT features two independent 12-bit Multibuffered ADC (MibADC) modules: MibADC1 with 24 dedicated inputs and MibADC2 with 16 inputs shared with MibADC1, totaling 24 unique analog input channels. Each module includes 64-word parity-protected result buffers - as specified in Section 1.1 and Table 3-1 of the RM46L840ZWTT datasheet.
What is the difference between RM46L840ZWTT and RM46L440ZWTT?
The RM46L840ZWTT has 1.25 MB of ECC flash and 192 KB of ECC RAM, while the RM46L440ZWTT has 1 MB flash and 128 KB RAM - otherwise identical in safety architecture, peripherals, and ZWT packaging. Both share the same pinout and software compatibility, making RM46L440ZWTT a cost-optimized alternative for less memory-intensive safety applications.
Can the RM46L840ZWTT operate at 105°C ambient temperature?
Yes, the RM46L840ZWTT is rated for operation from –40°C to +105°C ambient temperature, as confirmed in Table 3-1 (Device Comparison) and Section 5.4 (Recommended Operating Conditions) of the official datasheet. This extended temperature range supports deployment in harsh environments such as wind turbines, elevators, and industrial motor drives.
RM46L840ZWTT 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:
- 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:
RM46L840ZWTT FAQ
1.How can I place an order for RM46L840ZWTT through Aetrix?
Please submit a Request for Quotation (RFQ) for RM46L840ZWTT 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 RM46L840ZWTT reliable?
The price and inventory of RM46L840ZWTT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RM46L840ZWTT is usually 5 days.
3.What payment methods are accepted for RM46L840ZWTT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RM46L840ZWTT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RM46L840ZWTT?
RM46L840ZWTT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RM46L840ZWTT 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 RM46L840ZWTT?
For technical support, including RM46L840ZWTT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RM46L840ZWTT requirements.
6.How does Aetrix verify that RM46L840ZWTT is sourced from the original manufacturer or authorized distributors?
All RM46L840ZWTT 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 RM46L840ZWTT meets industry standards.
7.What is the process for return or replacement of RM46L840ZWTT?
All RM46L840ZWTT units undergo pre-shipment inspection (PSI). If there is an issue with RM46L840ZWTT, 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 RM46L840ZWTT part is unused and in its original packaging.
Return procedure for RM46L840ZWTT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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