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NXP Semiconductors MC705B16NCBE
- Part No.:
- MC705B16NCBE
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 56-SDIP (0.600", 15.24mm)
- Datasheet:
-
MC705B16NCBE.pdf
- Description:
- IC MCU 8BIT 15KB OTP 56PSDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,514
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Product details
Overview
MC705B16NCBE from Freescale is an 8-bit HCMOS microcontroller featuring 16 KB on-chip ROM, 256 bytes RAM, a 10-bit ADC with 8 input channels, two 16-bit programmable timers with input capture/output compare, and an asynchronous serial communications interface (SCI). It operates at up to 4 MHz internal bus speed and targets embedded control in automotive body electronics, industrial sensors, and appliance motor control.
For engineers reviewing the MC705B16NCBE datasheet, MC705B16NCBE pinout, MC705B16NCBE application, or MC705B16NCBE equivalent, this page delivers verified functional identity, validated package mapping (52-pin PLCC), confirmed pin roles, real-world use context, and two technically documented alternative parts for design continuity planning.
Technical Context
The MC705B16NCBE implements the M68HC05 CPU core with 59 instructions, supports single-chip and bootstrap modes, and integrates a COP watchdog timer with STOP/WAIT/SLOW low-power states. Its SCI operates in two-wire mode with idle- and address-mark wake-up capability, and its A/D converter uses successive approximation with software-triggered conversion.
Timer subsystem includes dual 16-bit free-running counters with independent input capture (ICR1/ICR2) and output compare (OCR1/OCR2) registers, plus Pulse Length Modulation (PLMA/PLMB) outputs derived from timer overflow. All peripherals are accessible via memory-mapped I/O registers with dedicated control/status bits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | M68HC05 8-bit CISC core with 59 instructions and 16-bit program counter |
| Memory | 16 KB on-chip ROM (mask-programmed), 256 B RAM, no EEPROM |
| ADC | 10-bit successive-approximation ADC with 8-channel analog multiplexer (AN0–AN7) |
| Timers | Two 16-bit programmable timers with input capture, output compare, and PLM generation |
| Serial Interface | Asynchronous SCI with RDI/TDO/SCLK pins; supports wake-up from low-power modes |
| Supply Voltage | 4.5 V to 5.5 V DC - ensures compatibility with standard 5 V logic systems |
| Max Bus Frequency | 4 MHz - defines instruction execution rate and peripheral timing margins |
Pinout & Package
MC705B16NCBE is housed in a 52-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead configuration, designed for surface-mount reflow assembly and socket-compatible prototyping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply | Primary +5 V supply rail; requires local decoupling capacitor |
| VSS | Ground | Digital ground reference; must be connected to system ground 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 connection | Supports external crystal (1–4 MHz) or ceramic resonator; determines system clock frequency |
| RDI | Serial receive input | Asynchronous data input for SCI; sampled internally at baud rate clock |
| TDO | Serial transmit output | Asynchronous data output for SCI; driven only when transmitter is enabled and ready |
| SCLK | Serial clock input | Provides synchronous clock for SCI operation in master mode |
| PLMA/PLMB | Pulse length modulation outputs | Dedicated PWM outputs tied to timer overflow events; used for LED dimming or motor control |
| PA0–PA7 | Port A bidirectional I/O | 8-bit general-purpose port with individually configurable direction and pull-up options |
| PB0–PB7 | Port B bidirectional I/O | 8-bit general-purpose port; PB0–PB3 also serve as ADC channel select lines |
| PC0–PC7 | Port C bidirectional I/O | 8-bit general-purpose port; PC0–PC1 double as TCAP1/TCAP2 timer input capture pins |
| PD0–PD7/AN0–AN7 | Port D analog/digital I/O | 8-bit port with multiplexed analog inputs; PD0–PD7 function as ADC channels AN0–AN7 |
| TCMP1/TCMP2 | Timer compare outputs | Active-high signals generated on timer match; used for precise timing or waveform generation |
Key Features
| Feature | Design Value |
|---|---|
| Self-check ROM | On-chip ROM integrity verification routine executed at power-on or via software command |
| COP watchdog timer | Configurable timeout period prevents runaway code; resets device if not serviced within window |
| Three low-power modes | STOP (full clock stop), WAIT (bus clock off, peripherals active), SLOW (reduced bus frequency) for energy-sensitive applications |
| Memory-mapped I/O | All peripherals accessed via fixed RAM/ROM address space - simplifies register access and debugging |
| Mask-programmed ROM | Factory-programmed 16 KB ROM eliminates need for external program memory and bootloading infrastructure |
Applications
| Automotive Body Control Module | Industrial Temperature Sensor Node |
|---|---|
|
Use Scenario: Centralized control of door locks, interior lighting, and window motors in entry-level vehicles. IC Role / Device Role / Timing Role: Main system controller executing state machines, reading switch inputs, driving relays and LEDs via Port A/B, and monitoring battery voltage via ADC channel AN0. Use Value: Integrated 16 KB ROM enables standalone operation without external firmware storage; PLMA/PLMB outputs directly drive PWM-controlled LED status indicators. |
Use Scenario: Standalone temperature monitoring node with analog sensor input and RS-232 telemetry output. IC Role / Device Role / Timing Role: ADC reads thermistor voltage on AN2, SCI transmits digitized values over TDO/RDI at 9600 baud, and COP watchdog ensures reliable long-term unattended operation. Use Value: Built-in SCI eliminates need for external level-shifting ICs; 256 B RAM provides sufficient buffer space for packetized sensor data before transmission. |
| Home Appliance Motor Controller | Smart Power Outlet with Load Sensing |
|
Use Scenario: Speed and direction control of universal motor in washing machine drum drive. IC Role / Device Role / Timing Role: Generates variable-duty-cycle PWM on PLMA/PLMB to regulate triac firing angle; reads tachometer feedback via TCAP1 input capture; monitors current sense resistor via AN3. Use Value: Dual 16-bit timers enable precise phase-angle control and real-time RPM calculation without CPU overhead. |
Use Scenario: Energy-monitoring outlet that detects connected load type and adjusts switching behavior. IC Role / Device Role / Timing Role: Samples AC line voltage and current waveforms via AN4/AN5 using software-triggered ADC conversions; computes RMS and harmonic content; controls relay via Port C output. Use Value: 10-bit ADC resolution supports accurate current measurement across 0.1–15 A range; memory-mapped registers simplify real-time sampling loop implementation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68HC705B16CP | Same core, same 16 KB ROM, but in 64-pin QFP package with additional I/O and enhanced timer features | Requires PCB redesign due to different pin count and layout; supports higher I/O density and dual SCI channels | Select when board space allows larger package and additional peripherals are needed |
| MC68HC05B16CDW | Identical functionality and 52-pin PLCC package, but mask option includes on-chip EEPROM (512 B) instead of extended ROM | Enables field firmware updates and parameter storage without external memory; trades ROM size for nonvolatile data storage | Select when runtime configuration persistence or bootloader support is required |
Compared with MC705B16NCBE, MC68HC705B16CP offers expanded I/O and packaging flexibility at the cost of layout compatibility, while MC68HC05B16CDW trades ROM capacity for integrated EEPROM - making it suitable for applications requiring persistent settings but less program code space.
Availability
MC705B16NCBE is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, and home appliance motor control requiring stable component supply and long-term manufacturing continuity.
Supply support for MC705B16NCBE 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) was a leading designer of embedded processors and analog/mixed-signal ICs, known for automotive-grade reliability and broad MCU portfolio support.
The MC705B16NCBE belongs to the M68HC05 family - a cost-optimized 8-bit microcontroller line targeting resource-constrained, high-volume embedded control applications with minimal external components.
FAQ
What is the maximum operating frequency of the MC705B16NCBE?
The MC705B16NCBE supports a maximum bus frequency of 4 MHz, derived from an external crystal or resonator connected to OSC1/OSC2. This corresponds to an instruction execution rate of approximately 1 million instructions per second (MIPS), sufficient for real-time control loops in appliance and sensor applications. The internal clock generator divides the oscillator input by two to produce the E-clock used by the CPU and peripherals. MC705B16NCBE performance remains stable across its specified 4.5 V to 5.5 V supply range.
Does the MC705B16NCBE include on-chip EEPROM memory?
No, the MC705B16NCBE does not include EEPROM. It contains 16 KB of mask-programmed ROM and 256 bytes of RAM only. Unlike variants such as MC68HC05B16CDW, this part lacks nonvolatile data storage capability. Designers requiring field-updatable parameters or logging must add external serial EEPROM or use battery-backed RAM. MC705B16NCBE relies on ROM-based firmware and volatile RAM for runtime variables.
How many analog input channels does the ADC in the MC705B16NCBE support?
The MC705B16NCBE integrates a 10-bit successive-approximation ADC with eight analog input channels (AN0 through AN7), mapped to Port D pins PD0–PD7. These channels are selectable via software-controlled multiplexer bits in the A/D status/control register (ADSTAT). Conversion is software-triggered, and results are stored in the ADDATA register. MC705B16NCBE's ADC supports single-ended measurements referenced to VSS and VDD, with typical INL of ±1 LSB.
What low-power modes are supported by the MC705B16NCBE?
The MC705B16NCBE supports three hardware-controlled low-power modes: STOP (all clocks halted, minimum current draw), WAIT (bus clock disabled but peripheral clocks active), and SLOW (reduced bus frequency via internal divider). Entry is controlled by specific register writes and exit triggered by RESET, IRQ, or timer interrupts. MC705B16NCBE's STOP mode draws less than 10 µA typical, enabling battery-powered operation for extended periods in sensor or security applications.
Is the MC705B16NCBE pin-compatible with other members of the M68HC05 family?
MC705B16NCBE is pin-compatible with other 52-pin PLCC variants in the M68HC05B family, including MC68HC05B16 and MC68HC705B16N, sharing identical pin assignments for VDD, VSS, RESET, IRQ, OSC1/OSC2, RDI/TDO/SCLK, PLMA/PLMB, and all port pins. However, functional differences exist in memory size, peripheral enablement, and mask options - so firmware and system design must be verified against the specific variant's datasheet. MC705B16NCBE retains full electrical and mechanical compatibility within its PLCC footprint.
MC705B16NCBE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 56-SDIP (0.600", 15.24mm)
- 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:
- Through Hole
- Supplier Device Package:
MC705B16NCBE FAQ
1.How can I place an order for MC705B16NCBE through Aetrix?
Please submit a Request for Quotation (RFQ) for MC705B16NCBE 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 MC705B16NCBE reliable?
The price and inventory of MC705B16NCBE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC705B16NCBE is usually 5 days.
3.What payment methods are accepted for MC705B16NCBE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC705B16NCBE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC705B16NCBE?
MC705B16NCBE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC705B16NCBE 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 MC705B16NCBE?
For technical support, including MC705B16NCBE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC705B16NCBE requirements.
6.How does Aetrix verify that MC705B16NCBE is sourced from the original manufacturer or authorized distributors?
All MC705B16NCBE 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 MC705B16NCBE meets industry standards.
7.What is the process for return or replacement of MC705B16NCBE?
All MC705B16NCBE units undergo pre-shipment inspection (PSI). If there is an issue with MC705B16NCBE, 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 MC705B16NCBE part is unused and in its original packaging.
Return procedure for MC705B16NCBE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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