AT91M42800A-33AU-999

Microcontrollers Overview

The AT91M42800A-33AU-999 is a microcontroller based on the ARM7TDMI core, operating at a maximum clock frequency of 33 MHz. It features 8 Kbytes of internal SRAM and supports an external address space up to 64 Mbytes via the External Bus Interface (EBI). The device provides 54 programmable I/O lines and includes two USARTs, two SPI interfaces, six 16-bit Timer/Counters, and three system timers. Operating voltage ranges from 2.7V to 3.6V for the core and 2.7V to 5.5V for I/O, with a temperature range of -40°C to +85°C.

Microcontrollers Feature Summary

• Integrates ARM7TDMI processor core with Embedded ICE for in-circuit emulation
• Supports fully static operation from 0 Hz to 33 MHz
• Includes Peripheral Data Controller (PDC) for high-speed data transfers without processor intervention
• Features Power Management Controller for individual deactivation of CPU and peripherals

Microcontrollers Applications

• Real-time control applications requiring fast exception handling
• Compute-intensive embedded systems utilizing external memory expansion
• Industrial devices requiring low power consumption modes
• Systems needing multiple serial communication interfaces (USART/SPI)

Microcontrollers Procurement Notes

Verify the specific suffix '999' against official Microchip documentation to confirm if it denotes a specific packaging, temperature grade, or quality certification variant. Ensure the ordering information matches the required LQFP-144 package type. Cross-reference the datasheet revision 1779D for any updates regarding pin compatibility or electrical characteristics before finalizing procurement.

Microcontrollers Selection Notes

Select this component when an ARM7-based solution with integrated debug capabilities is required. It is suitable for designs needing flexible external memory interfacing via EBI and robust peripheral sets including timers and serial controllers. Consider the 33 MHz performance limit and 8 KB SRAM capacity relative to application complexity. Verify voltage requirements align with the 2.7V-3.6V core supply specification.

Microcontrollers Part Context

This part belongs to the Atmel AT91 16/32-bit microcontroller family, which utilizes the ARM7TDMI processor core. The family is characterized by high-density nonvolatile memory technology and low power consumption. The AT91M42800A specifically combines the ARM core with on-chip SRAM and various peripheral functions on a monolithic chip to provide cost-effective solutions for compute-intensive tasks.

Microcontrollers Replacement Considerations

Consult Microchip's official obsolescence notices and cross-reference tools for direct replacements. Verify compatibility of the ARM7TDMI core architecture and pinout if substituting with other AT91 series members. Ensure that any alternative maintains support for Embedded ICE and similar peripheral counts.