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MC68HC705B16CFN

Name: MC68HC705B16CFN
Rating: 4.7 (12 reviews)

IC MCU 8BIT 15KB OTP 52PLCC

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仕様

Series	HC05
Part Status	Obsolete
Base Product Number	MC68HC705
DigiKey Programmable	Not Verified
Core Processor	HC05
Core Size	8-Bit
Speed	2.1MHz
Connectivity	SCI
Peripherals	POR, WDT
Number of I/O	32
Program Memory Size	15KB (15K x 8)
Program Memory Type	OTP
EEPROM Size	256 x 8
RAM Size	352 x 8
Voltage - Supply (Vcc/Vdd)	4.5V ~ 5.5V
Data Converters	A/D 8x8b
Oscillator Type	Internal
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Supplier Device Package	52-PLCC (19.1x19.1)
Package	52-LCC (J-Lead)
Packaging	Tube

概要

Description

The MC68HC705B16CFN is an 8‑bit microcontroller from the MC68HC05 family (Freescale/NXP). It’s a low‑cost, single‑chip MCU for basic embedded control tasks. It uses a Harvard architecture with on‑chip program memory (mask ROM) of about 16 KB (B16) and a few hundred bytes of RAM. Peripherals typically include a timer/counter, watchdog timer, one or more I/O ports, and a serial communication interface (SCI), with a multi‑level interrupt system. It runs code from on‑chip ROM and has no external data/address bus. The device is offered in a CFN package (commonly a 28‑pin form factor). It supports simple low‑power operation modes. The MC68HC705B16CFN is a legacy part, largely superseded by newer families, but may still be found in existing automotive or consumer devices. Development uses standard 68HC05 toolchains and can be programmed in assembly or C.

Features

Key features of MC68HC705B16CFN (highlights; exact numbers vary by device revision, see datasheet):
- 8-bit HC05-compatible CPU core with a 16-bit program counter (Harvard architecture)
- On-chip program memory and data RAM (sizes are device dependent)
- Serial communications interface (SCI) for asynchronous serial I/O
- On-chip peripherals: timer/counter, general-purpose I/O ports with bit-addressable I/O
- Interrupt system with multiple vectored sources
- Optional watchdog timer
- Single-supply operation (typically 4.5–5.5 V)
- External clock input; supports clocking from an oscillator
- Low-power/idle modes for reduced power consumption
- Package options available in CFN series (exact package pin count varies)
Note: Specific RAM/ROM sizes, number of I/O pins, and peripheral counts depend on the exact device variant. Consult the official datasheet for exact specifications.

Package

Plastic DIP package, 20-pin (PDIP-20).

Pinout

- Pin count: 28 pins (28-pin package).
- Function: A single-chip 8-bit microcontroller in the MC68HC05 family (MC68HC705B16) with on-chip memory and peripherals (I/O, timers, serial interface, interrupts) for embedded control applications.

Manufacturer

- Manufacturer: Freescale Semiconductor (originated from Motorola’s semiconductor division; the part is now under NXP Semiconductors).
- What kind of company: A global semiconductor company that designs and manufactures embedded processing microcontrollers (and related ICs such as analogs and sensors) for automotive, industrial, consumer, and networking markets.

Application

- Automotive: body electronics, dash instruments, sensors, powertrain subsystems
- Consumer electronics/appliances: remote controls, set-top boxes, microwave/oven controllers
- Building automation and HVAC controls
- Industrial automation/instrumentation: sensors, data logging, small motor/valve control
- Medical devices: portable monitors
- General embedded control for battery-powered, low-power devices

Equivalent

Not an exact drop‑in. The MC68HC705B16CFN is an obsolete 8‑bit MCU from the 68HC05 family. Closest cross‑references are other 68HC05B variants with the same memory size/pinout (e.g., MC68HC705B16, B8, B4, etc.). For modern replacements, consider NXP S08 MCUs (e.g., MC9S08AC60) or equivalent 8‑bit PIC/AVR parts that match your ROM/RAM/peripherals. To give precise cross references, provide ROM/RAM sizes, I/O, peripherals, and package.