28ACINF Datasheet | Next Electromics

28ACINF Technical Summary

Overview

The 28ACINF is a high-performance 28-pin microcontroller designed for embedded applications requiring robust processing capabilities, versatile I/O, and reliable non-volatile memory. Built around an efficient 8-bit architecture, this device delivers 100 MIPS at 100 MHz (5V operation) while integrating critical peripherals such as analog comparators, brown-out detection, and in-system programming support. Its combination of Flash memory, SRAM, and configurable clocking options makes it suitable for industrial control, automation, and consumer electronics.

Key Features

High-Speed Processing: 100 MIPS performance at 100 MHz (5V V_CC).
Non-Volatile Memory: 2048 x 12-bit EE/Flash program memory rated for 10,000 erase/write cycles.
Data Memory: 136 x 8-bit SRAM for dynamic data storage.
In-System Programming (ISP): Reprogrammable via OSC pins for field updates.
Clock Flexibility: Internal RC oscillator with selectable frequencies (31.25 kHz to 4 MHz) and ±8% accuracy.
Analog Comparator: Integrated for signal conditioning or threshold detection.
Brown-Out Detection (BOD): Configurable 4.2V threshold with enable/disable option.
Multi-Input Wakeup (MIWU): Supports low-power mode exit via interrupts on 8 pins.
High-Current I/O: All pins capable of sinking/sourcing 30 mA for driving LEDs or relays.
Timing Peripherals: Includes prescaler for RTCC (Real-Time Clock Counter) and postscaler for WDT (Watchdog Timer).

Applications

The 28ACINF is engineered for diverse embedded systems, including:

Industrial Automation: Motor control, sensor interfacing, and PLCs.
Consumer Electronics: Remote controls, smart home devices, and toys.
Automotive: Auxiliary control units, lighting systems, and diagnostics.
Power Management: Battery monitoring, brown-out protection circuits.
IoT Edge Nodes: Low-power wakeup via MIWU and in-field firmware updates.

Electrical Characteristics

Absolute Maximum Ratings

Supply Voltage (V_CC): -0.3V to +7.0V (beyond which permanent damage may occur).
I/O Pin Voltage: -0.3V to V_CC +0.3V.
Operating Temperature: -40°C to +85°C (industrial grade).
Storage Temperature: -65°C to +150°C.

Recommended Operating Conditions

V_CC Range: 3.0V to 5.5V (full performance at 5V).
Clock Frequency: 0 to 100 MHz (dependent on V_CC).
I/O Sink/Source Current: 30 mA per pin (absolute max).

Power Consumption

Active Mode (100 MHz, 5V): 25 mA typical.
Idle Mode (Internal RC, 4 MHz): 1.2 mA typical.
Sleep Mode (MIWU Enabled): 10 µA typical.

Package Information

The 28ACINF is offered in a 28-pin PDIP (Plastic Dual In-line Package) with the following mechanical specifications:

Package Dimensions: 36.32 mm x 13.46 mm (including leads).
Pin Spacing: 2.54 mm (standard DIP pitch).
Lead Material: Matte tin-plated copper alloy.
Mounting Style: Through-hole or socket-compatible.

Pinout Description

OSC1/OSC2: External crystal or clock input/output.
RC0-RC7: Multipurpose I/O with analog/digital functionality.
RB5/RB8: High-current I/O with interrupt-on-change support.
SX: Reserved for factory test (do not connect).
V_CC/GND: Power supply and ground pins (decoupling required).

Functional Description

The 28ACINF's architecture centers on an 8-bit data bus with a 12-bit instruction set, optimized for deterministic real-time control. Key subsystems include:

Memory Organization

Program Memory: 2 KB Flash with 10,000-cycle endurance, organized as 2048 x 12-bit words.
SRAM: 136 bytes for stack and variable storage, accessible in single cycle.