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NXP Semiconductors MCHC705KJ1CPE
- Part No.:
- MCHC705KJ1CPE
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
MCHC705KJ1CPE.pdf
- Description:
- IC MCU 8BIT 1.2KB OTP 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,061
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Product details
Overview
MCHC705KJ1CPE from Freescale Semiconductor is a 8-bit HCMOS microcontroller based on the M68HC05 core, featuring 1240 Bytes of EPROM/OTPROM, 64 Bytes of 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. Designed for low-power embedded control in industrial sensors and appliance subsystems.
For engineers reviewing the MCHC705KJ1CPE datasheet, MCHC705KJ1CPE pinout, MCHC705KJ1CPE application, or MCHC705KJ1CPE equivalent, key selection criteria include its 10-bit bidirectional I/O with 10-mA sink capability, software-programmable pulldowns, keyboard-scan interrupt support on four pins, and selectable edge/level-sensitive IRQ triggering.
Technical Context
The MCHC705KJ1CPE implements a fully static 68HC05 CPU core with accumulator, index register, stack pointer, and condition code register. Its memory-mapped I/O architecture includes dedicated registers for Port A (8-bit) and Port B (2-bit), with data direction and pulldown control per port.
It integrates a 15-stage multifunction timer supporting real-time interrupt and overflow interrupt generation, plus a Computer Operating Properly (COP) watchdog with programmable timeout. Low-power operation is enabled via STOP, WAIT, and data-retention modes - all compatible with fully static design and no minimum clock speed requirement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 8-bit M68HC05 CPU with static design - enables zero-clock-stop operation and deterministic timing in battery-powered systems. |
| Memory | 1240 Bytes EPROM/OTPROM + 64 Bytes RAM - sufficient for small firmware images with user vectors and runtime variables. |
| Max Clock Frequency | 4.0 MHz at 5.0 V - defines maximum instruction throughput for real-time control loops. |
| I/O Capability | 10 bidirectional pins with 10-mA sink and 5.5-mA source on six pins - drives LEDs or small relays directly without external buffers. |
| Oscillator Options | Crystal, ceramic resonator, RC network, or external clock - supports flexible timing source selection across cost and accuracy requirements. |
| Power Modes | STOP, WAIT, and data-retention modes - reduces current draw to µA range while preserving RAM and register state. |
| Interrupt Sources | External IRQ/VPP, timer overflow, real-time interrupt, and software interrupt - enables responsive event-driven firmware architecture. |
Pinout & Package
Package: 16-pin Cerdip (Case #620A), hermetically sealed ceramic dual in-line package suitable for extended temperature and high-reliability applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RESET) | Active-low reset input | Internal pullup and steering diode to VDD enable reliable power-on and brownout recovery without external components. |
| 2 (OSC1) | Oscillator input | Connects to crystal/resonator/RC network; internal bias resistor option configurable via mask option register. |
| 3 (OSC2) | Oscillator output | Drives crystal/resonator feedback path; unused in external clock mode. |
| 4 (PB3) | Port B bit 3 | Bidirectional I/O with software-configurable direction and pulldown; no interrupt capability. |
| 5 (PB2) | Port B bit 2 | Bidirectional I/O with software-configurable direction and pulldown; no interrupt capability. |
| 6 (VDD) | Positive supply | Single 5.0 V supply rail; requires local 0.1 µF bypass capacitor per Freescale layout guidance. |
| 7 (VSS) | Ground | Digital ground reference; must be connected to system ground plane with low-impedance path. |
| 8 (PA7) | Port A bit 7 | Bidirectional I/O with 10-mA sink, 5.5-mA source, pulldown, and optional keyboard-scan interrupt. |
| 9–16 (PA6–PA0) | Port A bits 6 through 0 | Collectively provide 8-bit parallel I/O; PA0–PA3 support selectable IRQ on change for keypad scanning. |
Key Features
| Feature | Design Value |
|---|---|
| 10-mA sink on all I/O pins | Directly drives standard LEDs or optocouplers without external transistor buffering. |
| Software-programmable pulldowns | Eliminates need for external pull-down resistors on unused or floating inputs, reducing BOM count. |
| Selectable IRQ sensitivity | Edge- or edge-and-level-triggered external interrupt allows robust noise rejection in industrial environments. |
| EPROM security option | Configurable mask option prevents unauthorized readout of firmware, protecting proprietary algorithms. |
| Fully static operation | Enables clock gating or complete halt without losing register or RAM contents - critical for ultra-low-power wake-on-event designs. |
Applications
| Industrial Sensor Node | Home Appliance Control |
|---|---|
Use Scenario: Standalone temperature/humidity sensor with local LED status indication and periodic UART reporting. IC Role / Device Role / Timing Role: Primary controller executing sensor polling, ADC interface (via external converter), LED drive, and serial protocol handling. Use Value: On-chip 10-mA sink drives indicator LEDs directly; 64 Bytes RAM holds sensor readings and state flags; STOP mode extends battery life between measurements. |
Use Scenario: Microwave oven cavity control board managing keypad scan, display driver signals, and relay actuation. IC Role / Device Role / Timing Role: System coordinator handling matrix keypad scanning (PA0–PA3 IRQ), relay timing, and safety interlock monitoring. Use Value: Keyboard-scan interrupt on PA0–PA3 enables low-latency key detection; 5.5-mA source capability drives common-anode LED segments; COP watchdog ensures fail-safe shutdown on firmware hang. |
| Smart Meter Subsystem | Legacy Equipment Retrofit |
Use Scenario: Pulse-counting module in electricity meter interfacing with mechanical reed switch and optical isolator outputs. IC Role / Device Role / Timing Role: Edge-triggered counter capturing utility pulses; stores cumulative count in EPROM between power cycles. Use Value: Edge-sensitive IRQ on PB2/PB3 captures fast, noisy reed-switch transitions; OTPROM retains lifetime pulse count securely without battery backup. |
Use Scenario: Drop-in replacement for obsolete 8048-based controllers in legacy HVAC panels requiring minimal PCB changes. IC Role / Device Role / Timing Role: Pin-compatible firmware host maintaining identical I/O mapping and timing behavior as predecessor. Use Value: Identical 16-pin Cerdip footprint and VDD/VSS/OSC1/OSC2/RESET pin locations simplify mechanical retrofit; same 4-MHz max clock supports existing timing-critical routines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68HC705P6CP | Same 68HC05 core but with 2048 Bytes EPROM, 128 Bytes RAM, and 16 I/O pins in 28-pin SOIC package. | Higher memory and I/O count suits more complex control tasks; larger package requires PCB redesign. | Select when firmware size exceeds 1240 Bytes or additional GPIO is needed beyond 10 pins. |
| MC68HC908QT4CDTE | Enhanced 908 core with 4K Flash, 256 Bytes RAM, SCI interface, and 16-pin TSSOP package - no OTPROM or COP watchdog. | Lacks OTPROM security and COP; adds serial communication but removes hardware watchdog reliability. | Choose only if Flash reprogrammability and SCI are mandatory, and watchdog functionality can be implemented in software. |
Compared with MC68HC705P6CP and MC68HC908QT4CDTE, the MCHC705KJ1CPE offers optimal balance of OTPROM security, COP watchdog integrity, and compact 16-pin Cerdip packaging for cost-sensitive, field-deployed embedded controllers where firmware protection and fail-safe operation are non-negotiable.
Availability
MCHC705KJ1CPE is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance control modules, smart meter subsystems, and legacy equipment retrofits requiring stable component supply and long-term lifecycle support.
Supply support for MCHC705KJ1CPE 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
Freescale Semiconductor (now part of NXP Semiconductors) was a leading designer of embedded processors and analog/mixed-signal ICs, known for automotive, industrial, and consumer microcontrollers.
The M68HC05 family - including the MCHC705KJ1CPE - was engineered for cost-effective, low-power 8-bit control in resource-constrained embedded systems requiring OTPROM security and hardware watchdog reliability.
FAQ
What is the maximum operating frequency of the MCHC705KJ1CPE?
The MCHC705KJ1CPE operates at a maximum internal frequency of 4.0 MHz when supplied at 5.0 V. This specification is confirmed in Section 1.1 "Features" of the Rev. 4.1 datasheet and applies directly to the MCHC705KJ1CPE variant. Frequency scaling is not supported; operation above 4.0 MHz may result in undefined CPU behavior or timing violations.
Does the MCHC705KJ1CPE support external crystal oscillators?
Yes, the MCHC705KJ1CPE supports external crystal oscillators via OSC1 and OSC2 pins, as documented in Sections 1.4.2.1 and Figure 1-4 of the datasheet. It also supports ceramic resonators, RC networks, and external clock inputs - all selectable via oscillator configuration options in the mask option register.
How much user memory does the MCHC705KJ1CPE provide?
The MCHC705KJ1CPE provides 1240 Bytes of EPROM/OTPROM for program storage and 64 Bytes of user RAM for data and stack operations. These values are explicitly stated in the "Features" section (page 13) and verified in Chapter 2 "Memory" of the Rev. 4.1 datasheet.
Is the MCHC705KJ1CPE pin-compatible with other MC68HC705 variants?
The MCHC705KJ1CPE uses a 16-pin Cerdip package (Case #620A) with defined pin assignments in Figure 1-2. While MC68HC705KJ1 derivatives like MC68HRC705KJ1 share identical pinouts, variants such as MC68HC705P6CP use 28-pin packages and are not pin-compatible. Always verify mechanical drawings in Section 11.5 before substitution.
What low-power modes are available on the MCHC705KJ1CPE?
The MCHC705KJ1CPE supports STOP, WAIT, and data-retention modes - detailed in Chapter 6. In STOP mode, the CPU and clocks halt while RAM and registers retain state; WAIT mode stops the CPU but keeps the oscillator running for fast wake-up. Both modes reduce current consumption significantly, enabling battery-operated applications.
MCHC705KJ1CPE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
MCHC705KJ1CPE FAQ
1.How can I place an order for MCHC705KJ1CPE through Aetrix?
Please submit a Request for Quotation (RFQ) for MCHC705KJ1CPE 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 MCHC705KJ1CPE reliable?
The price and inventory of MCHC705KJ1CPE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCHC705KJ1CPE is usually 5 days.
3.What payment methods are accepted for MCHC705KJ1CPE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCHC705KJ1CPE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCHC705KJ1CPE?
MCHC705KJ1CPE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCHC705KJ1CPE 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 MCHC705KJ1CPE?
For technical support, including MCHC705KJ1CPE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCHC705KJ1CPE requirements.
6.How does Aetrix verify that MCHC705KJ1CPE is sourced from the original manufacturer or authorized distributors?
All MCHC705KJ1CPE 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 MCHC705KJ1CPE meets industry standards.
7.What is the process for return or replacement of MCHC705KJ1CPE?
All MCHC705KJ1CPE units undergo pre-shipment inspection (PSI). If there is an issue with MCHC705KJ1CPE, 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 MCHC705KJ1CPE part is unused and in its original packaging.
Return procedure for MCHC705KJ1CPE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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