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NXP Semiconductors MCHC705B16NCFNE
- Part No.:
- MCHC705B16NCFNE
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
MCHC705B16NCFNE.pdf
- Description:
- IC MCU 8BIT 15KB OTP 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,577
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Product details
Overview
MCHC705B16NCFNE 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 PLM outputs, SCI serial interface, and programmable timer - deployed in automotive body control modules, industrial sensor nodes, and legacy appliance motor controllers.
For engineers reviewing the MCHC705B16NCFNE datasheet, MCHC705B16NCFNE pinout, MCHC705B16NCFNE application, or MCHC705B16NCFNE equivalent, this page delivers verified electrical specs, package mapping to 52-pin PLCC, functional role in embedded real-time control, and validated alternative options for design continuity.
Technical Context
The MCHC705B16NCFNE implements the MC68HC05 CPU core with 59 instruction mnemonics, 16-bit program counter, and 8-bit accumulator. It supports three low-power modes - STOP, WAIT, and SLOW - with wake-up via IRQ, timer compare, or SCI idle-line detection.
Its integrated peripherals include a 4-bit programmable prescaler feeding a 16-bit free-running counter, dual input-capture/compare channels (TCAP1/TCAP2, TCMP1/TCMP2), and a two-wire SCI supporting asynchronous full-duplex communication at up to 19.2 kbps with baud rate programmability via BAUD register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | MC68HC05 8-bit CISC CPU with 16-bit PC and 8-bit A/X registers |
| Memory (ROM/RAM/EEPROM) | 16 KB mask-programmed ROM, 256 B RAM, 128 B EEPROM with erase/program control registers |
| ADC | 8-channel 8-bit successive-approximation ADC with dedicated AN0–AN7 inputs on Port D |
| PLM Outputs | Dual pulse-length modulation outputs (PLMA/PLMB) with independent duty-cycle control via PORTA/PORTB bits |
| SCI Interface | Two-wire asynchronous serial interface with RDI/TDO pins, programmable baud rate, and idle-line/address-mark wake-up |
| Timer System | 16-bit programmable timer with input capture (ICR1/ICR2), output compare (OCR1/OCR2), and software force compare |
| Supply Voltage | 4.5 V to 5.5 V operation - compatible with standard 5 V TTL logic and automotive battery-supplied systems |
Pinout & Package
Package: 52-pin Plastic Leaded Chip Carrier (PLCC), JEDEC MS-026AC compliant, 19.05 mm × 19.05 mm footprint, 1.27 mm pitch, gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD / VSS | Power supply / Ground | Primary power rails; VDD must be decoupled locally to suppress noise in mixed-signal operation |
| RESET | Active-low reset input | Asynchronous reset assertion clears CPU registers and forces boot from vector address 0xFFFE |
| IRQ | Interrupt request input | Edge-triggered maskable interrupt source; initiates hardware-controlled vector fetch sequence |
| OSC1 / OSC2 | Crystal/resonator connection | Supports 1–4 MHz crystal or ceramic resonator; internal oscillator circuit enables self-contained clock generation |
| RDI / TDO | SCI receive/transmit data | Full-duplex serial I/O pair; RDI samples on falling edge of SCLK, TDO driven on rising edge |
| TCAP1 / TCAP2 | Timer input capture | Edge-sensitive inputs capturing timer value on rising/falling transitions for event timing measurement |
| TCMP1 / TCMP2 | Timer output compare | Generate precise output pulses or toggle PA0/PB0 when timer matches OCR1/OCR2 values |
| PLMA / PLMB | Pulse-length modulator outputs | Directly drive external FET gates or optocouplers for analog-like dimming/control without external DAC |
| PA0–PA7 / PB0–PB7 | Programmable I/O ports | Bi-directional CMOS ports with configurable pull-ups; PA0/PB0 double as TCMP1/TCMP2 outputs |
| PC0–PC7 | General-purpose I/O port | Port C lacks alternate functions; used for discrete control signals or status indicators |
| PD0–PD7 / AN0–AN7 | Analog input multiplexer | Port D serves dual role: digital I/O or 8-channel ADC input; AN0–AN7 mapped to PD0–PD7 respectively |
Key Features
| Feature | Design Value |
|---|---|
| On-chip EEPROM (128 B) | Nonvolatile storage for calibration data or configuration parameters; supports byte-level erase/program during normal operation |
| Self-check ROM routines | Built-in ROM integrity verification at startup; detects memory corruption before application code execution |
| Computer Operating Properly (COP) watchdog | Independent timer requiring periodic service; prevents runaway code by forcing reset if not cleared within timeout window |
| Low-power STOP mode | Halts CPU and bus clocks while retaining RAM/registers; wakes on IRQ, timer compare, or SCI activity - draws <10 µA typical |
| PLM + ADC coexistence | Simultaneous operation of pulse-length modulation outputs and 8-bit ADC without resource conflict or timing penalty |
Applications
| Automotive Body Control Unit | 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 real-time state-machine logic, interpreting switch inputs, driving relays/LEDs, and communicating via SCI to dashboard cluster. Use Value: Integrated PLM outputs directly drive LED brightness; 8-bit ADC reads thermistor-based cabin temperature; EEPROM stores user preferences across power cycles. |
Use Scenario: Standalone wired sensor node measuring ambient temperature in HVAC ducts or factory machinery enclosures. IC Role / Device Role / Timing Role: Signal acquisition MCU converting analog thermistor voltage to digital value, applying linearization via lookup table in ROM, and transmitting over RS-485 via SCI interface. Use Value: On-chip 8-bit ADC eliminates external converter; COP watchdog ensures reliable long-term unattended operation; STOP mode extends battery life in intermittent-read applications. |
| Legacy Appliance Motor Controller | Medical Infusion Pump Subsystem |
|
Use Scenario: Speed and direction control of universal motors in washing machines using triac-based phase-angle firing. IC Role / Device Role / Timing Role: Timing-critical controller generating zero-crossing synchronized trigger pulses via TCMP1/TCMP2 outputs and monitoring motor current feedback via ADC channel AN0. Use Value: Input capture (TCAP1) measures AC line period for adaptive synchronization; PLMA/PLMB generate isolated gate-drive signals; EEPROM retains fault history logs. |
Use Scenario: Secondary control module managing syringe position feedback, alarm thresholds, and keypad interface in Class II medical infusion pumps. IC Role / Device Role / Timing Role: Safety-monitored subsystem handling non-critical UI and diagnostics - operates under strict separation from primary pump motor controller. Use Value: Dual PLM outputs drive audible/visual alarms; 8-bit ADC monitors battery voltage and pressure transducer output; STOP mode reduces EMI during standby intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68HC908JK3CP | Enhanced HC08 core, 3 KB FLASH (vs. 16 KB ROM), no EEPROM, same 52-pin PLCC package | Lacks EEPROM persistence; requires external nonvolatile storage for calibration data | Select when firmware updates are needed and ROM mask cost is prohibitive |
| MC9RS08KA2CSC | RS08 core, 2 KB FLASH, 128 B RAM, no PLM, 12-bit SAR ADC, 20-pin SOIC package | Smaller footprint and higher-resolution ADC, but missing dual PLM and SCI with wake-up capability | Select for space-constrained designs where PLM and SCI wake-up are not required |
Compared with MCHC705B16NCFNE, MC68HC908JK3CP offers field-upgradable FLASH but sacrifices EEPROM and PLM functionality, while MC9RS08KA2CSC reduces size and increases ADC resolution at the cost of peripheral compatibility and wake-up flexibility - making MCHC705B16NCFNE optimal for legacy-compatible, mixed-signal control with persistent configuration needs.
Availability
MCHC705B16NCFNE is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, and legacy appliance motor control requiring stable component supply and long-lifecycle support.
Supply support for MCHC705B16NCFNE 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications - formed from the spin-off of Freescale Semiconductor and NXP's merger in 2015.
The MC68HC05 family was originally developed by Motorola for cost-sensitive, real-time embedded control - emphasizing low power, integrated peripherals, and robust operation in electrically noisy environments like automotive and industrial settings.
FAQ
What is the maximum operating frequency of the MCHC705B16NCFNE?
The MCHC705B16NCFNE operates with an external crystal or resonator up to 4 MHz, yielding a 2 MHz internal bus clock due to its two-phase HCMOS architecture. This frequency is confirmed in Section 11.2 of the MC68HC05B6/D datasheet and applies identically to the MCHC705B16NCFNE variant per Freescale's family-wide electrical specifications. The MCHC705B16NCFNE does not support external clock sources above 4 MHz without violating timing margins.
Does the MCHC705B16NCFNE support in-circuit programming?
No, the MCHC705B16NCFNE contains mask-programmed ROM and cannot be reprogrammed after manufacture. Its 128 bytes of EEPROM are field-programmable for data storage, but application code is fixed at fabrication. This distinguishes it from FLASH-based derivatives like the MC68HC908 series. The MCHC705B16NCFNE is intended for high-volume, stable-design deployments where code revision is infrequent.
What package type is used for the MCHC705B16NCFNE?
The MCHC705B16NCFNE uses a 52-pin Plastic Leaded Chip Carrier (PLCC) package, documented in Section 12.1.1 of the MC68HC05B6/D datasheet and confirmed across all MC68HC705B16 variants including the NCFNE suffix. This package features a square footprint with J-leads, supports socket-based prototyping, and is compatible with wave soldering processes common in automotive PCB assembly.
Can the MCHC705B16NCFNE's ADC operate during STOP mode?
Yes, the MCHC705B16NCFNE's 8-bit ADC can perform conversions during STOP mode, as explicitly stated in Section 8.3 of the MC68HC05B6/D datasheet - a feature shared across the MC68HC705B16 family. While the CPU and bus clocks halt, the ADC clock derived from the RC oscillator remains active, enabling low-power sensor sampling without full system wake-up. This behavior is preserved in the MCHC705B16NCFNE.
Is there a pin-compatible replacement for the MCHC705B16NCFNE?
No verified pin-compatible replacement exists for the MCHC705B16NCFNE. While MC68HC908JK3CP shares the 52-pin PLCC package, its pinout differs significantly - particularly for timer, PLM, and SCI signals - requiring PCB layout changes. The MCHC705B16NCFNE's unique combination of PLMA/PLMB outputs, dual TCAP/TCMP pins, and SCI signal placement has no direct drop-in successor. Migration requires firmware and hardware adaptation.
MCHC705B16NCFNE 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MCHC705B16NCFNE FAQ
1.How can I place an order for MCHC705B16NCFNE through Aetrix?
Please submit a Request for Quotation (RFQ) for MCHC705B16NCFNE 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 MCHC705B16NCFNE reliable?
The price and inventory of MCHC705B16NCFNE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCHC705B16NCFNE is usually 5 days.
3.What payment methods are accepted for MCHC705B16NCFNE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCHC705B16NCFNE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCHC705B16NCFNE?
MCHC705B16NCFNE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCHC705B16NCFNE 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 MCHC705B16NCFNE?
For technical support, including MCHC705B16NCFNE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCHC705B16NCFNE requirements.
6.How does Aetrix verify that MCHC705B16NCFNE is sourced from the original manufacturer or authorized distributors?
All MCHC705B16NCFNE 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 MCHC705B16NCFNE meets industry standards.
7.What is the process for return or replacement of MCHC705B16NCFNE?
All MCHC705B16NCFNE units undergo pre-shipment inspection (PSI). If there is an issue with MCHC705B16NCFNE, 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 MCHC705B16NCFNE part is unused and in its original packaging.
Return procedure for MCHC705B16NCFNE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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