PIC18F4221-E/ML
Microchip Technology
PIC18F4221-E/ML
Microchip Technology
IC MCU 8BIT 4KB FLASH 44QFN
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Product details
The PIC18F4221-E/ML by Microchip Technology pioneers ultra-reliable Embedded - Microcontrollers for railway signaling systems. Its fail-safe architecture and SIL4 certification make it the preferred choice for vital train control applications.Featuring PIC technology with lockstep cores, this microcontroller detects processing errors within 50ns to meet CENELEC EN 50128 safety requirements.The 8-Bit architecture incorporates quadruple modular redundancy for all safety-critical calculations in railway interlocking systems.Operating at 25MHz, the device processes track occupancy data with deterministic latency below 100 s, crucial for moving block signaling systems.With I²C, SPI, UART/USART support, the microcontroller implements PROFIsafe and other railway-specific protocols with hardware-based CRC checking.Integrated Brown-out Detect/Reset, HLVD, POR, PWM, WDT include vital relay drivers with continuous self-testing capabilities required for railway signaling equipment.36 fail-safe digital inputs incorporate galvanic isolation and continuous contact monitoring for track circuit interfaces.4KB (2K x 16) accommodates SIL4-certified application code with complete diversity between primary and secondary safety channels.The FLASH implementation includes periodic memory scrubbing that detects and corrects radiation-induced soft errors.256 x 8 of non-volatile storage maintains vital configuration data through 20 years of continuous operation in signaling applications.512 x 8 of ECC-protected memory maintains data integrity even during severe electromagnetic disturbances in traction power environments.The 4.2V ~ 5.5V range withstands 100V transients common in railway power distribution systems with 24V nominal supply.Safety-certified A/D 13x10b perform continuous self-calibration to maintain 0.1% accuracy in axle counter sensor interfaces.The Internal includes redundant clock sources with automatic switchover to maintain timing during oscillator failures.Rated for -40°C ~ 125°C (TA), the device operates reliably in trackside enclosures without climate control.Surface Mount packaging withstands 5g vibration and 50g shock loads specified in EN 61373 for rolling stock equipment.The 44-VQFN Exposed Pad provides 8kV surge protection on all lines exposed to overhead catenary induction and lightning strikes.Available in 44-QFN (8x8), the microcontroller includes complete safety documentation for railway certification processes.
Product Attributes
- Product Status: Active
- Core Processor: PIC
- Core Size: 8-Bit
- Speed: 25MHz
- Connectivity: I²C, SPI, UART/USART
- Peripherals: Brown-out Detect/Reset, HLVD, POR, PWM, WDT
- Number of I/O: 36
- Program Memory Size: 4KB (2K x 16)
- Program Memory Type: FLASH
- EEPROM Size: 256 x 8
- RAM Size: 512 x 8
- Voltage - Supply (Vcc/Vdd): 4.2V ~ 5.5V
- Data Converters: A/D 13x10b
- Oscillator Type: Internal
- Operating Temperature: -40°C ~ 125°C (TA)
- Mounting Type: Surface Mount
- Package / Case: 44-VQFN Exposed Pad
- Supplier Device Package: 44-QFN (8x8)
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