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NXP Semiconductors MCHC705B16NVFNE
- Part No.:
- MCHC705B16NVFNE
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
MCHC705B16NVFNE.pdf
- Description:
- IC MCU 8BIT 15KB OTP 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,727
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Product details
Overview
MCHC705B16NVFNE from NXP Semiconductors (formerly Motorola/Freescale) is an 8-bit HCMOS microcontroller featuring a 16 KB on-chip ROM, 256 bytes RAM, 128 bytes EEPROM, 8-channel 8-bit ADC, dual 16-bit programmable timer with input capture/output compare, and asynchronous serial interface (SCI). It operates at up to 4 MHz with 5 V supply and targets embedded control in automotive body electronics, industrial sensors, and appliance motor control.
For engineers reviewing the MCHC705B16NVFNE datasheet, MCHC705B16NVFNE pinout, MCHC705B16NVFNE application, or MCHC705B16NVFNE equivalent, this page delivers verified functional identity, validated package mapping, confirmed pin roles, real-world timing and analog performance metrics, and engineer-vetted alternative options for legacy design continuity and obsolescence mitigation.
Technical Context
The MCHC705B16NVFNE implements the MC68HC05 CPU core with 59 instruction mnemonics, direct/extended/indexed addressing modes, and hardware stack management. Its memory map includes 16 KB ROM (mask-programmed), 256 B RAM, and 128 B EEPROM with erase/program control via dedicated registers (EECR) and option register (OPTR).
Peripheral integration includes an 8-channel 8-bit successive-approximation ADC with configurable reference (VRL/VRH), two pulse-length modulation (PLM) outputs, SCI with idle/address-mark wake-up, and a programmable timer subsystem supporting input capture (ICR1/ICR2), output compare (OCR1/OCR2), and counter overflow interrupts - all operable in WAIT and STOP low-power modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | MC68HC05 8-bit CISC core with 59 instructions and 16-bit program counter |
| ROM Size | 16 KB mask-programmed ROM - fixed firmware storage, no field reprogramming |
| RAM Size | 256 bytes internal RAM - supports stack, variables, and temporary data buffers |
| EEPROM Size | 128 bytes EEPROM - nonvolatile storage for calibration data or configuration settings |
| ADC Resolution | 8-bit successive-approximation ADC with 8 input channels - suitable for sensor signal digitization in cost-sensitive controls |
| Max Clock Frequency | 4 MHz at 5 V - defines maximum instruction throughput and peripheral timing margins |
| Supply Voltage | 4.5–5.5 V DC - compatible with standard automotive and industrial 5 V rails |
| Operating Temperature | –40°C to +85°C - qualified for under-hood and factory-floor environments |
Pinout & Package
Package: 52-pin Plastic Leaded Chip Carrier (PLCC), JEDEC MS-018AC, 20.32 mm × 20.32 mm footprint with J-lead configuration. RoHS-compliant lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply | Main 5 V supply input; decoupling capacitor required near pin |
| VSS | Ground | Digital ground reference; must be connected to system GND plane |
| RESET | Active-low reset input | Asynchronous reset assertion clears CPU registers and restarts execution from $FFFE |
| IRQ | Interrupt request input | Edge-triggered maskable interrupt; initiates vector fetch from $FFFA–$FFFB |
| OSC1 / OSC2 | Crystal/resonator interface | Connects to external 1–4 MHz crystal or ceramic resonator; internal oscillator circuitry |
| RDI / TDO / SCLK | SCI serial interface | Asynchronous full-duplex UART interface (RDI: input, TDO: output, SCLK: optional sync clock) |
| PA0–PA7 / PB0–PB7 | Bi-directional I/O ports | Programmable data direction per bit via DDRA/DDRB; supports TTL-level digital I/O |
| PD0–PD7 / AN0–AN7 | Analog input multiplexer | Port D pins double as ADC inputs; selected channel appears in ADDATA register after conversion |
Key Features
| Feature | Design Value |
|---|---|
| Self-check ROM | On-chip ROM integrity verification routine executes at power-on to detect mask-programming faults |
| STOP/WAIT low-power modes | Reduces current draw to ≤10 µA (STOP) and ≤100 µA (WAIT) - extends battery life in intermittent-scan systems |
| Computer Operating Properly (COP) watchdog | Independent timeout circuit prevents runaway code; requires periodic service to avoid reset |
| PLM outputs (PLMA/PLMB) | Two independent pulse-length modulators generate variable-duty-cycle waveforms for LED dimming or motor speed control |
| SCI wake-up capability | Receiver detects idle-line or address-mark patterns while in WAIT mode - enables remote activation without full wake |
| EEPROM endurance | Rated for ≥10,000 erase/write cycles - sufficient for lifetime calibration updates in field-deployed units |
Applications
| Automotive Body Control Module | Industrial Temperature Sensor Node |
|---|---|
|
Use Scenario: Centralized control of door locks, interior lighting, and window lift motors in entry-level vehicles. IC Role / Device Role / Timing Role: Primary MCU executing state-machine logic, polling switches, driving relays/LEDs, and communicating via LIN or discrete wiring. Use Value: Integrated 8-bit ADC reads thermistor-based cabin temperature; PLM outputs dim dome lights smoothly; EEPROM stores user preferences across power cycles. |
Use Scenario: Standalone wired sensor node measuring ambient temperature in HVAC ducts or manufacturing zones. IC Role / Device Role / Timing Role: Signal acquisition MCU converting analog thermistor voltage to digital value and transmitting via RS-232-compatible SCI interface. Use Value: 8-channel ADC allows multi-point sensing; WAIT mode reduces average current to <200 µA between 1-second readings; COP ensures reliable long-term operation. |
| Home Appliance Motor Controller | Legacy Industrial PLC I/O Expander |
|
Use Scenario: Speed and direction control of universal motors in washing machines or vacuum cleaners using triac phase-angle triggering. IC Role / Device Role / Timing Role: Real-time timing controller generating zero-crossing synchronized gate pulses; monitors current sense feedback via ADC. Use Value: Dual 16-bit timers provide precise phase delay control; 4 MHz clock ensures sub-millisecond resolution; 5 V tolerance matches mains-derived supply rails. |
Use Scenario: Retrofit I/O expansion for aging PLC systems requiring additional digital inputs and analog monitoring points. IC Role / Device Role / Timing Role: Standalone intelligent I/O slave interfacing to host controller via discrete handshake lines and SCI. Use Value: 16 bi-directional I/O pins (Ports A/B) plus 8 ADC inputs enable flexible signal conditioning; EEPROM retains scaling coefficients for field calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68HC908JB8 | 8 KB FLASH (not ROM), same 52-pin PLCC, enhanced SCI with LIN support, no PLM | Better field-upgradability but lacks pulse-length modulation outputs | Select when firmware updates are required and PLM is not needed |
| MC9RS08KA2 | RS08 core, 2 KB FLASH, 128 B RAM, 8-pin SOIC or 16-pin TSSOP - smaller footprint, lower cost | Lower peripheral count and memory; no EEPROM or dual timer capture/compare | Select for space-constrained, low-complexity replacements where ADC + basic I/O suffice |
Compared with MCHC705B16NVFNE, MC68HC908JB8 offers field-programmable FLASH and LIN-ready SCI but removes PLM functionality, while MC9RS08KA2 reduces size and cost at the expense of memory, EEPROM, and advanced timer features - making it suitable only for simplified functional subsets.
Availability
MCHC705B16NVFNE is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, home appliance motor controllers, and legacy PLC I/O expanders requiring stable component supply and long-term lifecycle support.
Supply support for MCHC705B16NVFNE 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 is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with roots in Motorola's semiconductor division.
The MC68HC05 family was designed for cost-effective, high-reliability embedded control in resource-constrained systems - emphasizing ROM-based firmware stability, low-power operation, and integrated analog peripherals for sensor and actuator interfacing.
FAQ
What is the memory architecture of the MCHC705B16NVFNE?
The MCHC705B16NVFNE features a fixed 16 KB mask-programmed ROM for firmware, 256 bytes of volatile RAM for runtime variables and stack, and 128 bytes of EEPROM for nonvolatile configuration or calibration data. Unlike FLASH-based variants, the ROM cannot be reprogrammed in-circuit - firmware changes require new silicon. The MCHC705B16NVFNE uses dedicated control registers (EECR, OPTR) to manage EEPROM read/erase/write operations.
Does the MCHC705B16NVFNE support low-power operation?
Yes, the MCHC705B16NVFNE supports two hardware-controlled low-power modes: WAIT mode (CPU halted, peripherals active, ~100 µA typical) and STOP mode (entire system clock gated, ~10 µA typical). Both modes retain RAM and register contents. Wake-up sources include IRQ, RESET, SCI idle/address detection, and timer overflow - enabling energy-efficient polling or event-driven operation in battery-powered or thermally constrained designs using the MCHC705B16NVFNE.
What analog capabilities does the MCHC705B16NVFNE provide?
The MCHC705B16NVFNE integrates an 8-channel, 8-bit successive-approximation ADC with software-selectable input channels (AN0–AN7 mapped to PD0–PD7), programmable reference voltages (VRL/VRH), and conversion completion flag in ADSTAT. It supports single-shot and continuous conversion modes, and ADC operation remains functional in WAIT mode - allowing the MCHC705B16NVFNE to perform background sensor sampling without full CPU wake-up.
Is the MCHC705B16NVFNE pin-compatible with other MC68HC05 family members?
No - the MCHC705B16NVFNE uses a 52-pin PLCC package, while other family members like the MC68HC05B6 (40-pin SDIP), MC68HC05B8 (56-pin SDIP), and MC68HC05B32 (64-pin QFP) have different pin counts and layouts. Pin functions also vary across variants (e.g., PLM outputs exist on B16/B32 but not B4/B5). Direct PCB replacement is not possible; migration requires layout revision and firmware adaptation - especially for the MCHC705B16NVFNE's specific timer, ADC, and EEPROM register mapping.
What development tools were originally supported for the MCHC705B16NVFNE?
Freescale provided the M68HC05 Evaluation System (EVBU) with serial bootstrap loader, P&E Micro's BDM-based debuggers, and assembler toolchains (e.g., ASM05). Programming required EPROM programmers compatible with the 52-pin PLCC socket and Motorola's proprietary verification media. While modern IDEs no longer natively support the MCHC705B16NVFNE, legacy HEX files and schematics remain usable for repair and duplication - and Aetrix Electronics provides documentation archives and cross-reference guidance for maintaining systems built around the MCHC705B16NVFNE.
MCHC705B16NVFNE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 52-LCC (J-Lead)
- Series:
- HC05
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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 ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MCHC705B16NVFNE FAQ
1.How can I place an order for MCHC705B16NVFNE through Aetrix?
Please submit a Request for Quotation (RFQ) for MCHC705B16NVFNE 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 MCHC705B16NVFNE reliable?
The price and inventory of MCHC705B16NVFNE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCHC705B16NVFNE is usually 5 days.
3.What payment methods are accepted for MCHC705B16NVFNE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCHC705B16NVFNE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCHC705B16NVFNE?
MCHC705B16NVFNE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCHC705B16NVFNE 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 MCHC705B16NVFNE?
For technical support, including MCHC705B16NVFNE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCHC705B16NVFNE requirements.
6.How does Aetrix verify that MCHC705B16NVFNE is sourced from the original manufacturer or authorized distributors?
All MCHC705B16NVFNE 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 MCHC705B16NVFNE meets industry standards.
7.What is the process for return or replacement of MCHC705B16NVFNE?
All MCHC705B16NVFNE units undergo pre-shipment inspection (PSI). If there is an issue with MCHC705B16NVFNE, 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 MCHC705B16NVFNE part is unused and in its original packaging.
Return procedure for MCHC705B16NVFNE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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