C8051F51x Automotive & Industrial MCUs

The C8051F51x automotive and industrial microcontrollers (MCUs) are available in small form factor packages from 32-pin to 48-pin, making them ideal for applications that need to pack a significant amount of performance (50 MIPS) and integration (12-bit ADC) into a constrained space. Pin-for-pin compatibility exists between the C8051F50x series, C8051F51x series, and the C8051F58x/59x series.

With on-chip Voltage Regulator, Power-On Reset, VDD monitor, Watchdog Timer, and a clock oscillator, the Automotive MCUs, including the C8051F51x devices, are truly stand-alone System-on-a-Chip solutions. The Flash memory can be reprogrammed even in-circuit, providing non-volatile data storage, and also allowing field upgrades of the 8051 firmware. User software has complete control of all peripherals, and may individually shut down any or all peripherals for power savings.

Communication interfaces

C8051F51x Common Specs

  • 50 MIPS 8051 CPU
  • 64 or 32 kB Flash memory
  • 4 kB RAM
  • 24 MHz on-board oscillator (±0.5%) with clock multiplier
  • 12-bit, 200 ksps ADC, ±1LSB INL
  • Up to 32 analog inputs
  • Up to 40 digital I/O
  • CAN 2.0 B, LIN 2.1
  • 2 x UART, SPI, I²C
  • PWM, Timers
  • 1.8 to 5.25 V input supply
  • –40 to 125 ºC operating range
  • Two on-chip comparator and temperature sensor
  • Packages:
    • 48-Pin QFP/QFN
    • 40-Pin QFN
    • 32-Pin QFP/QFN


Find the Right C8051F51x Device Select Columns
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Part Number MCU Core MHz Flash (kB) RAM (kB) Dig I/O Pins 5 Volt Tolerant ADC 1 USB Temp Sensor Timers (16-bit) PCA Channels ADC 2 DAC Comparators UART SPI I2C HS I2C Slave I2S EMIF CAN LIN AES AEC-Q100 Vdd (min) Vdd (max) Package Type Package Size (mm) Internal Osc. VREF Debug Interface Temperature Range (ºC)
8051 50 32 4.25 33 12-bit, 32-ch., 200 ksps 4 6 2 1 1 1 0 0 1 0 0 1.8 5.25 QFN40 6x6 ±0.5 C2 -40 125

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