P89V51RB2FA,529

Microcontrollers Overview

The P89V51RB2FA is an 8-bit microcontroller based on the 80C51 architecture, manufactured by NXP Semiconductors. It features 16 kB of on-chip Flash program memory with ISP and IAP capabilities, and 1 kB of data RAM. The device operates at 5 V from 0 MHz to 40 MHz and supports a selectable X2 mode for doubled throughput or reduced EMI. It includes four 8-bit I/O ports, three 16-bit timers/counters, a PCA with PWM functions, SPI, enhanced UART, and a programmable watchdog timer.

Microcontrollers Feature Summary

• Supports In-System Programming (ISP) and In-Application Programming (IAP) for flash reconfiguration without removing the chip.
• Features an X2 mode option allowing selection between conventional 12-clock and accelerated 6-clock machine cycles.
• Includes a Programmable Counter Array (PCA) with five capture/compare modules supporting PWM generation.
• Integrates a hardware watchdog timer and brownout detection circuit for system reliability.

Microcontrollers Applications

• Ultrasonic envelope detection ranging systems
• Industrial control computer applications
• General-purpose embedded control requiring field firmware updates

Microcontrollers Procurement Notes

Verify the specific ordering suffix against the official datasheet to confirm package type and temperature range. The 'FA' suffix indicates a PLCC44 package. Confirm that the required flash capacity matches the RB2 variant (16 kB). Check current manufacturing status as this component may be discontinued.

Microcontrollers Selection Notes

Select this part when an 80C51-compatible core with integrated flash programming is required. Ensure the application fits within the 16 kB code limit and 1 kB RAM constraint. Verify that the PLCC44 package is compatible with the target PCB footprint and assembly process.

Microcontrollers Part Context

This component belongs to the P89V51RB2/RC2/RD2 family of 8-bit microcontrollers. The RB2 variant specifically provides 16 kB of flash memory, distinguishing it from the RC2 (32 kB) and RD2 (64 kB) variants within the same series.

Microcontrollers Replacement Considerations

P89V51RB2BBC (TQFP44 package)

Microcontrollers FAQ

How does the X2 mode affect performance?

The X2 mode reduces the machine cycle from 12 clocks to 6 clocks, effectively doubling the throughput at the same clock frequency compared to the default 12-clock mode.

What is the function of the Brownout Detection circuit?

The Brownout Detection circuit monitors the supply voltage and triggers a reset or interrupt if the voltage drops below the threshold (typically 2.35 V), protecting the system from severe fluctuations.