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NXP Semiconductors MC68HC705KJ1CDW
- Part No.:
- MC68HC705KJ1CDW
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC68HC705KJ1CDW.pdf
- Description:
- IC MCU 8BIT 1.2KB OTP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,219
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Product details
Overview
MC68HC705KJ1CDW from NXP (formerly Freescale) is a 8-bit HCMOS microcontroller in the M68HC05 family, featuring 1240 Bytes of EPROM/OTPROM, 64 Bytes RAM, a 15-stage multifunction timer, and COP watchdog. It operates at up to 4.0 MHz at 5.0 V and supports crystal, ceramic resonator, RC, or external clock sources. Used in cost-sensitive embedded control applications such as appliance motor control and industrial sensor interfaces.
For engineers reviewing the MC68HC705KJ1CDW datasheet, MC68HC705KJ1CDW pinout, MC68HC705KJ1CDW application, or MC68HC705KJ1CDW equivalent, key selection criteria include its 16-pin SOIC package, 10 bidirectional I/O lines with 10-mA sink capability, software-programmable pulldowns, keyboard-scan interrupt support on four pins, and selectable edge/level-sensitive external interrupt triggering.
Technical Context
The MC68HC705KJ1CDW implements the 68HC05 CPU core with fully static operation-no minimum clock speed required-and includes memory-mapped I/O registers for direct peripheral access. Its internal oscillator supports multiple timing sources including crystal (up to 4 MHz), ceramic resonator, or RC network, with programmable bias resistor options.
Peripheral integration includes a 15-stage multifunction timer with real-time and overflow interrupt capability, a Computer Operating Properly (COP) watchdog with configurable timeout, and low-power modes (Stop, Wait, Data-Retention). The device supports EPROM security programming and illegal address reset detection for system robustness.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 8-bit 68HC05 CPU with fully static design - enables zero-clock-stop operation for ultra-low-power sleep modes. |
| Memory | 1240 Bytes EPROM/OTPROM + 64 Bytes RAM - sufficient for small firmware tasks without external memory. |
| Max Clock Frequency | 4.0 MHz at 5.0 V - defines real-time response limit for control loops and I/O servicing. |
| I/O Capability | 10 bidirectional pins with 10-mA sink and 5.5-mA source (on six pins) - drives LEDs, relays, and logic directly. |
| Timer | 15-stage multifunction timer with RTI and overflow interrupts - supports precise timing, PWM generation, and event counting. |
| Power Modes | Stop, Wait, and Data-Retention modes - reduces current draw to µA range while preserving RAM and register state. |
| COP Watchdog | Configurable enable/disable and timeout period - prevents runaway code in unattended systems. |
Pinout & Package
MC68HC705KJ1CDW is housed in a 16-pin Small Outline Integrated Circuit (SOIC) package (Case #751G), compliant with JEDEC MS-012AC, with 1.27 mm pitch and surface-mount footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RESET) | Active-low reset input | Internal pullup and steering diode to VDD - simplifies reset circuitry; accepts power-on or manual reset pulses. |
| 2 (OSC1) | Oscillator input | Connects to crystal/resonator/RC network - primary clock source entry point for internal oscillator. |
| 3 (OSC2) | Oscillator output | Drives crystal/resonator feedback path - required for crystal-based timing; unused in RC/external clock mode. |
| 4 (PB3) | Port B bit 3 | Bidirectional I/O with software-configurable direction and pulldown - usable as general-purpose or interrupt-capable line. |
| 5 (PB2) | Port B bit 2 | Bidirectional I/O with same configuration as PB3 - supports keyboard scan or external event sensing. |
| 6 (VDD) | Positive supply | Single 5.0 V ±10% supply - powers all internal logic and I/O drivers; requires local 0.1 µF bypass capacitor. |
| 7 (VSS) | Ground | Reference return for all signals and power - must be low-impedance connection to minimize noise coupling. |
| 8 (PA7) | Port A bit 7 | General-purpose I/O or OSC1 alternate function - dual-role pin supporting clock source flexibility. |
| 16 (IRQ/VPP) | Interrupt request / programming voltage | Edge- or level-sensitive interrupt input; during EPROM programming, receives 12.5 V VPP - requires external switching. |
| 15–9 (PA0–PA6) | Port A bits 0–6 | Seven bidirectional I/O lines with pulldown control and optional IRQ capability on PA0–PA3 - enables matrix keypad scanning. |
Key Features
| Feature | Design Value |
|---|---|
| 10-mA sink per I/O pin | Direct drive of LEDs, small solenoids, or TTL inputs without external buffers - reduces BOM count. |
| Software-programmable pulldowns | Eliminates need for external pull-down resistors on all 10 I/O lines - saves PCB space and assembly cost. |
| Keyboard-scan interrupt on PA0–PA3 | Hardware-assisted key detection with interrupt on press/release - enables responsive human interface with minimal CPU overhead. |
| Selectably edge- or level-sensitive IRQ | Adapts to diverse external signal types (e.g., pushbutton vs. level-triggered sensor) without hardware redesign. |
| EPROM security option | Prevents unauthorized readout of firmware - protects proprietary algorithms in production units. |
Applications
| Appliance Motor Control | Industrial Sensor Interface |
|---|---|
Use Scenario: Controlling BLDC fan motors in HVAC systems using simple commutation logic and thermal feedback. IC Role / Device Role / Timing Role: Primary controller executing motor timing sequences, reading thermistor ADC inputs (via external converter), and managing fault shutdown. Use Value: On-chip 15-stage timer enables precise phase timing; 10-mA I/O drives gate drivers directly; COP watchdog ensures safe motor stop on failure. |
Use Scenario: Reading analog temperature/humidity sensors and transmitting data via UART (using bit-banged GPIO). IC Role / Device Role / Timing Role: Signal conditioner and protocol translator - digitizes sensor outputs and formats serial packets for host MCU. Use Value: 64 Bytes RAM holds calibration coefficients and packet buffers; low-power Wait mode extends battery life in wireless nodes. |
| Consumer Remote Control | Point-of-Sale Keypad |
Use Scenario: IR remote transmitter with button matrix, LED indicators, and battery voltage monitoring. IC Role / Device Role / Timing Role: System-on-chip managing key scan, IR carrier generation (via timer), and low-battery alert logic. Use Value: Keyboard-scan interrupt on PA0–PA3 detects keypresses instantly; 4 MHz clock supports 38 kHz IR carrier generation. |
Use Scenario: Membrane keypad scanner in retail terminals, detecting simultaneous key presses and debouncing. IC Role / Device Role / Timing Role: Dedicated keypad controller offloading host processor - handles matrix scanning, debounce, and interrupt signaling. Use Value: Software pulldowns eliminate external resistors; 10 I/O lines support 4×4 matrix + status LEDs; IRQ/VPP pin doubles as interrupt source. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68HC705P6CDW | Same 68HC05 core but with 2 KB EPROM, 128 Bytes RAM, and additional I/O - no keyboard-scan interrupt on PA0–PA3. | Higher memory capacity suits more complex firmware; lacks dedicated key-scan interrupt - requires polling or external logic. | Choose when firmware size exceeds 1240 Bytes and keyboard interrupt is not required. |
| MC9RS08KA2CSC | Renesas RS08 core, 2 KB Flash, 128 Bytes RAM, 16 MHz max, integrated LVD and BOR - no EPROM, different instruction set. | Modern Flash-based replacement with better power management and debug support; incompatible binary and toolchain. | Choose for new designs requiring field-upgradability, lower active current, or enhanced safety features. |
Compared with MC68HC705P6CDW and MC9RS08KA2CSC, the MC68HC705KJ1CDW offers optimal balance of legacy compatibility, keyboard-scan hardware acceleration, and minimal external component count for cost-constrained 8-bit control.
Availability
MC68HC705KJ1CDW is available at Aetrix Electronics and suitable for appliance motor control, industrial sensor interface, consumer remote control, and point-of-sale keypad applications requiring stable component supply and long-term obsolescence management.
Supply support for MC68HC705KJ1CDW includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
NXP Semiconductors, headquartered in Eindhoven, Netherlands, develops high-performance mixed-signal and standard-product ICs for automotive, industrial, and IoT markets.
The MC68HC705KJ1CDW belongs to the legacy M68HC05 microcontroller family, designed for cost-sensitive, low-complexity embedded control where deterministic timing, minimal external components, and proven reliability are critical.
FAQ
What is the maximum operating frequency of the MC68HC705KJ1CDW?
The MC68HC705KJ1CDW supports a maximum internal operating frequency of 4.0 MHz when powered at 5.0 V. This frequency is achieved using an external crystal or ceramic resonator connected between OSC1 and OSC2 pins. The device also supports RC oscillator and external clock configurations, though those may yield lower or less stable frequencies depending on component tolerances and temperature.
Does the MC68HC705KJ1CDW support in-circuit programming?
No, the MC68HC705KJ1CDW uses EPROM/OTPROM memory, which requires UV erasure (for EPROM variants) or one-time electrical programming (for OTPROM). Programming is performed off-line using a dedicated EPROM programmer applying 12.5 V to the IRQ/VPP pin. In-circuit reprogramming is not supported - firmware updates require device replacement.
How many I/O pins does the MC68HC705KJ1CDW have, and what are their drive capabilities?
The MC68HC705KJ1CDW provides 10 bidirectional I/O lines: PA0–PA7 (8 pins), PB2, and PB3. All pins support 10-mA sink current; six of them (PA0–PA5) also provide 5.5-mA source capability. Each pin features software-controllable internal pulldowns, eliminating the need for external resistors in most pull-down configurations.
What low-power modes are available on the MC68HC705KJ1CDW?
The MC68HC705KJ1CDW supports Stop, Wait, and Data-Retention modes. In Stop mode, the oscillator halts and current drops to ~1 µA while retaining RAM and register contents. Wait mode stops the CPU but keeps the oscillator running, enabling fast wake-up from timer or IRQ events. Data-Retention mode maintains RAM with minimal current during extended standby.
Can the MC68HC705KJ1CDW generate a 38 kHz IR carrier signal?
Yes, the MC68HC705KJ1CDW can generate a 38 kHz IR carrier using its 15-stage multifunction timer in conjunction with software-controlled I/O toggling. With a 4.0 MHz system clock, the timer can achieve sub-µs resolution, allowing precise 38 kHz square-wave generation (26.3 µs period) via interrupt-driven or polled output - commonly used in remote control transmitter designs.
MC68HC705KJ1CDW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Series:
- HC05
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- HC05
- Core Size:
- 8-Bit
- Speed:
- 4MHz
- Connectivity:
- -
- Peripherals:
- POR, WDT
- Number of I/O:
- 10
- Program Memory Size:
- 1.2KB (1.2K x 8)
- Program Memory Type:
- OTP
- EEPROM Size:
- -
- RAM Size:
- 64 x 8
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 5.5V
- Data Converters:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC68HC705KJ1CDW FAQ
1.How can I place an order for MC68HC705KJ1CDW through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC705KJ1CDW on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MC68HC705KJ1CDW reliable?
The price and inventory of MC68HC705KJ1CDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC705KJ1CDW is usually 5 days.
3.What payment methods are accepted for MC68HC705KJ1CDW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68HC705KJ1CDW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68HC705KJ1CDW?
MC68HC705KJ1CDW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68HC705KJ1CDW order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MC68HC705KJ1CDW?
For technical support, including MC68HC705KJ1CDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC705KJ1CDW requirements.
6.How does Aetrix verify that MC68HC705KJ1CDW is sourced from the original manufacturer or authorized distributors?
All MC68HC705KJ1CDW products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MC68HC705KJ1CDW meets industry standards.
7.What is the process for return or replacement of MC68HC705KJ1CDW?
All MC68HC705KJ1CDW units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC705KJ1CDW, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MC68HC705KJ1CDW part is unused and in its original packaging.
Return procedure for MC68HC705KJ1CDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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