HC05BD5

HC05BD5 Technical Summary

Overview

The HC05BD5 is a member of the Motorola MC68HC05 microcontroller family, designed for embedded control applications. This 8-bit microcontroller combines high performance with low power consumption, making it suitable for a wide range of industrial, automotive, and consumer applications. The device features an enhanced HC05 CPU core with improved instruction set and processing capabilities.

Key aspects of the HC05BD5 include integrated memory (ROM/RAM), versatile I/O ports, multi-function timer, pulse width modulation capabilities, and serial communication interfaces. The microcontroller supports multiple low-power modes for energy-efficient operation in battery-powered applications.

Features

• Enhanced 8-bit HC05 CPU core with expanded instruction set
• On-chip memory options:
  • ROM (MC68HC05BD5)
  • EPROM (MC68HC705BD3 variant)
  • RAM for data storage
  • Bootstrap ROM for programming
• Versatile I/O capabilities with multiple configurable ports:
  • Port A - General purpose I/O
  • Port B - General purpose I/O
  • Port C - Multi-function I/O
  • Port D - Multi-function I/O
• Multi-function timer with multiple operating modes
• Pulse Width Modulation (PWM) capability
• M-BUS serial interface for communication
• Sync Signal Processor for timing-sensitive applications
• Multiple low-power modes (Wait, Stop)
• Comprehensive interrupt handling with multiple sources
• Wide operating voltage range

Applications

The HC05BD5 microcontroller is designed for a variety of embedded control applications, including:

• Automotive control systems
• Industrial automation
• Consumer electronics
• Appliance control
• Security systems
• Sensor interfaces
• Motor control systems
• Battery-powered devices

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage: -0.3V to +7.0V
• Input Voltage: -0.3V to VDD+0.3V
• Operating Temperature Range: -40°C to +85°C
• Storage Temperature Range: -55°C to +150°C

Recommended Operating Conditions

• Supply Voltage: 3.0V to 5.5V
• Operating Temperature: -40°C to +85°C
• Input High Voltage: 0.7VDD to VDD
• Input Low Voltage: VSS to 0.2VDD

DC Characteristics

• Power Supply Current (Active Mode): 5mA typical at 5V, 4MHz
• Power Supply Current (Wait Mode): 1.5mA typical at 5V
• Power Supply Current (Stop Mode): 10μA maximum
• Input Leakage Current: ±1μA maximum
• Output Drive Current: 10mA sink/source per pin

Memory Organization

The HC05BD5 features a flexible memory architecture with different configurations available depending on the specific variant:

MC68HC05BD3 Variant

• RAM: 176 bytes
• ROM: 1856 bytes

MC68HC705BD3 Variant

• RAM: 176 bytes
• EPROM: 1856 bytes

MC68HC05BD5 Variant

• RAM: 176 bytes
• ROM: 3776 bytes

All variants include a bootstrap ROM for programming and initialization purposes.

Package Information

The HC05BD5 is available in multiple package options to suit different application requirements:

Standard Package Options

• 28-pin Plastic Dual In-line Package (PDIP)
• 28-pin Small Outline Integrated Circuit (SOIC)
• 28-pin Plastic Leaded Chip Carrier (PLCC)

Package Dimensions

• PDIP:
  • Body Length: 35.56mm
  • Body Width: 7.62mm
  • Lead Pitch: 2.54mm
• SOIC:
  • Body Length: 17.9mm
  • Body Width: 7.5mm
  • Lead Pitch: 1.27mm
• PLCC:
  • Body Size: 11.43mm x 11.43mm
  • Lead Pitch: 1.27mm

Pin Description

The HC05BD5 features a comprehensive set of I/O pins organized into multiple ports:

Port A (PA0-PA7)

• 8-bit general purpose I/O port
• Individually programmable as input or output
• Internal pull-up resistors option

Port B (PB0-PB7)

• 8-bit general purpose I/O port
• Individually programmable as input or output
• Higher drive capability compared to Port A

Port C (PC0-PC7)

• 8-bit multi-function port
• Alternate functions include timer I/O, serial interface
• Configurable through Port C Configuration Register

Port D (PD0-PD7)

• 8-bit multi-function port
• Alternate functions include PWM outputs, interrupt inputs
• Configurable through Port D Configuration Register

Special Function Pins

• RESET: Active-low reset input
• IRQ: Maskable interrupt input
• VDD/VSS: Power supply pins
• OSC1/OSC2: Crystal oscillator connections

Development Support

The HC05BD5 is supported by a comprehensive development ecosystem:

• In-circuit emulators for real-time debugging
• Cross-compilers and assemblers
• Evaluation boards for rapid prototyping
• Programming tools for EPROM variants
• Detailed technical documentation and application notes

Ordering Information

The HC05BD5 is available in different variants and package options. The complete ordering information includes:

• Base part number (MC68HC05BD5)
• Temperature range suffix (C for commercial, I for industrial)
• Package type suffix (P for PDIP, S for SOIC, L for PLCC)
• Speed grade suffix (specific to variant)

Example: MC68HC05BD5CP for commercial temperature range PDIP package