The EM78P458APJ-G is a cost-effective 8-bit microcontroller developed by Elan Microelectronics. It is designed for control-oriented embedded systems that require stable performance, low power consumption, and minimal external components.
Overview
EM78P458APJ-G is based on Elan’s proprietary 8-bit RISC architecture. With an integrated One-Time Programmable (OTP) ROM, this MCU is ideal for fixed-function applications such as appliance control, consumer electronics, and LED systems.
Key Features
This microcontroller offers 4K words of OTP program memory, 192 bytes of internal RAM, and 12 programmable input/output lines. It supports both RC and crystal oscillators, making it suitable for various timing-critical tasks. The device also integrates multiple timers, including one 8-bit and one 16-bit timer/counter, along with interrupt capabilities for enhanced real-time performance.
Pinout
The EM78P458APJ-G is available in SOP-20 and other compact packages. Its pin configuration includes power, ground, reset, and multiple I/O ports, making it easy to integrate into small and medium-sized control circuits.
Applications
This MCU finds widespread use in home appliances such as electric cookers, electric fans, and digital timers. It's also common in remote controls, LED controllers, small automation systems, and simple industrial electronics. Its OTP memory makes it especially suitable for cost-sensitive products where firmware updates are not required.
Why Choose EM78P458APJ-G?
The biggest advantage of the EM78P458APJ-G lies in its simplicity and reliability. Since it uses OTP ROM, it is tamper-proof once programmed and perfect for mass production environments. It also operates within a wide voltage range from 2.2V to 5.5V, allowing it to perform consistently under different power conditions. Its compact design and minimal external component requirement help reduce total system cost.
Frequently Asked Questions
Can EM78P458APJ-G be reprogrammed?
No, it is an OTP microcontroller, which means it can only be programmed once.
What clock sources does it support?
It supports both RC-type and crystal-type oscillators.
Is it suitable for low-voltage systems?
Yes, it supports operating voltages as low as 2.2V.
Conclusion
If you're looking for a low-cost, reliable, and easy-to-integrate microcontroller for your fixed-function applications, the EM78P458APJ-G is a strong candidate. With a proven architecture and simplified design process, it’s well-suited for high-volume, stable embedded systems where flexibility is not required.