MC68HC705J1ACDW

The MC68HC705J1ACDW is an 8‑bit microcontroller in Motorola/Freescale’s HC05 family. It combines an HC05 CPU core with on‑chip program ROM, data RAM, and a set of peripherals in a compact package for low‑cost embedded control.
Key points:
- Core: HC05 8‑bit CPU with a simple instruction set; low power and easy I/O.
- Memory: integrated program memory (ROM) and data RAM; exact sizes vary by the J1A variant.
- Peripherals: timer/counter, serial communications interface (SCI) for asynchronous serial, general I/O, interrupt support; watchdog on many versions.
- Power/Speed: typically 2.0–5.5 V operation; clock speeds up to a few MHz (depends on variant).
- Package: available in common packages (DIP/SOIC) with industrial/automotive temperature options.
- Use: suitable for small embedded controllers in automotive, appliances, and consumer electronics.
- Development: programmed in 6805 assembly or C with standard HC05 toolchains.
For exact ROM/RAM sizes, speed, and package options, consult the MC68HC705J1ACDW datasheet.

Equivalent parts depend on ROM/RAM size, package, and temperature grade. The MC68HC705J1ACDW belongs to the 68HC705J1A family. Do you need pin‑compatible cross‑refs within that family, or any 8‑bit MCU with similar specs? Please specify package (DIP/SOIC/PLCC), ROM/RAM size, and temp range, and I’ll provide exact cross references.

Concise features of MC68HC705J1ACDW:
- 8-bit HC05-family microcontroller core (on-chip ROM/RAM)
- Two 8-bit I/O ports
- Serial communications interface (SCI) for asynchronous comms
- Timer module and watchdog timer
- On-chip oscillator with external clock option; reset logic included
- Multiple interrupt sources (SCI, timer, external, etc.)
- Low-power modes and power-on reset
- Operating voltage: typically 2.0–5.5 V (industrial temps)
- Package: 28-pin (DIP/SOIC) as indicated by the C D W suffix
Note: exact ROM/RAM sizes and max clock frequency depend on the specific device variant; refer to the datasheet for precise figures.

- Pin count: 40 pins (40-pin package/DIP).
- Function: An 8-bit microcontroller from the 68HC05 family (MC68HC705J1). It includes the CPU, on-chip program memory and RAM, I/O ports, timers, a serial interface, and interrupt control for embedded applications.

- Manufacturer: NXP Semiconductors. The MC68HC705J1ACDW traces to Motorola’s 68HC05 line, was produced by Freescale after Motorola’s split, and was later acquired by NXP in 2015.
- What kind of company: NXP is a multinational semiconductor company that designs, manufactures, and sells embedded processing ICs, including microcontrollers and processors, for automotive, industrial, and consumer applications.

Typical application areas for the MC68HC705J1ACDW:
- Automotive body electronics (lighting, door modules, basic sensors)
- Consumer electronics (remote controls, audio/video gear, peripheral controllers)
- Home appliances (washers, refrigerators, HVAC controllers)
- Small industrial/instrumentation (sensors, data acquisition, process monitoring)
- General low-power, cost-sensitive embedded control tasks (motor-control interfaces, panel meters)
Notes: it is an 8‑bit MCU with on‑chip peripherals (timers, serial communications, ADC) suitable for simple, inexpensive controllers.

Plastic DIP (dual-in-line) package, 28 pins.