28AC
28AC Technical Summary
Overview
The 28AC is a high-performance microcontroller from Scenix Semiconductor, designed for embedded applications requiring fast processing and flexible I/O capabilities. With a 50 MIPS performance at 50 MHz oscillator frequency, this microcontroller is ideal for real-time control and processing tasks. It features in-system programming, multiple clock modes, and a rich set of peripherals including timers, comparators, and interrupt support.
Key Features
- High Performance: 50 MIPS at 50 MHz oscillator frequency
- Memory: 2048 x 12 bits EE/Flash program memory with 10,000 rewrite cycles and 136 x 8 bits SRAM
- In-System Programming: Capability through OSC pins
- Internal RC Oscillator: Configurable rate from 31.25 KHz to 4 MHz with ±8% accuracy
- Clock Modes:
- Internal RC oscillator
- External oscillator
- Crystal/resonator options
- External RC oscillator
- Peripherals:
- 8-bit Watchdog Timer (WDT)
- 8-bit Timer (RTCC)
- Multi-Input Wakeup (MIWU)
- Analog Comparator
- Brown-Out Detector
Applications
The 28AC microcontroller is suitable for a wide range of applications, including but not limited to:
- Industrial control systems
- Consumer electronics
- Automotive electronics
- Embedded systems requiring real-time processing
- IoT devices with low-power requirements
- Sensor interfacing and data acquisition systems
Electrical Characteristics
Absolute Maximum Ratings
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VDD) | -0.3 to +6.0 | V |
| Input Voltage (VIN) | -0.3 to VDD + 0.3 | V |
| Operating Temperature | -40 to +85 | °C |
| Storage Temperature | -65 to +150 | °C |
DC Characteristics
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VDD) | 2.5 | 3.3 | 5.5 | V |
| Input High Voltage (VIH) | 0.7 VDD | - | VDD | V |
| Input Low Voltage (VIL) | 0 | - | 0.3 VDD | V |
| Output High Voltage (VOH) | VDD - 0.7 | - | VDD | V |
| Output Low Voltage (VOL) | 0 | - | 0.6 | V |
AC Characteristics
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Oscillator Frequency (XT, LP, HS modes) | - | 50 | - | MHz |
| Instruction Cycle Time | - | 20 | - | ns |
| Reset Pulse Width | 100 | - | - | ns |
Package Information
The 28AC microcontroller is available in multiple package options to suit various application requirements. Below are the details for the standard package:
Standard Package Dimensions
| Parameter | Value (inches) | Value (millimeters) |
|---|---|---|
| Length | 0.600 | 15.24 |
| Width | 0.300 | 7.62 |
| Height | 0.100 | 2.54 |
| Lead Pitch | 0.050 | 1.27 |
Memory Organization
Program Memory
The 28AC features 2048 x 12 bits of EE/Flash program memory, rated for 10,000 rewrite cycles. The program memory is organized as follows:
- Program Counter (PC): 12-bit wide, capable of addressing the entire program memory space.
- Subroutine Stack: Supports nested subroutine calls with a dedicated stack.
Data Memory
The microcontroller includes 136 x 8 bits of SRAM for data storage. Key features
