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NXP Semiconductors XC705B32CFNE
- Part No.:
- XC705B32CFNE
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
XC705B32CFNE.pdf
- Description:
- IC MCU 8BIT 32KB OTP 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,215
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Product details
Overview
XC705B32CFNE from Freescale Semiconductor is an 8-bit HCMOS microcontroller in the MC68HC05 family, featuring 32 KB on-chip ROM, 256 bytes RAM, 128 bytes EEPROM, 8-channel 8-bit ADC, dual PLM outputs, SCI serial interface, and a programmable timer system. 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 XC705B32CFNE datasheet, XC705B32CFNE pinout, XC705B32CFNE application, or XC705B32CFNE equivalent, this page delivers verified functional identity, package mapping (52-pin PLCC), validated pin roles, real-world use cases, and two confirmed alternative parts for design continuity and sourcing flexibility.
Technical Context
The XC705B32CFNE implements the M68HC05 CPU core with 10-bit instruction word width, supporting single-chip, STOP, WAIT, and SLOW low-power modes. Its memory map includes 32 KB ROM (mask-programmed), 256 B RAM, and 128 B EEPROM with erase/program control via dedicated registers (EECR, OPTR).
Peripheral integration includes an 8-channel 8-bit successive-approximation ADC with internal reference, two independent pulse-length modulation (PLM) channels for analog output emulation, and a full-duplex SCI with idle-line/address-mark wake-up-enabling robust communication in electrically noisy environments typical of automotive and industrial settings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | M68HC05 8-bit CISC core with 10-bit instruction word; enables compact code footprint and deterministic timing for real-time control loops. |
| ROM Size | 32 KB mask-programmed ROM; provides fixed, tamper-resistant firmware storage without external memory dependency. |
| RAM / EEPROM | 256 bytes RAM + 128 bytes EEPROM; supports runtime variable storage and nonvolatile configuration retention across power cycles. |
| ADC | 8-channel 8-bit SAR ADC with internal reference; allows direct sensor interfacing (e.g., thermistors, potentiometers) without external signal conditioning. |
| PLM Outputs | Two independent pulse-length modulation channels (PLMA/PLMB); generate analog-equivalent DC voltage levels via RC filtering for LED dimming or actuator control. |
| SCI Interface | Full-duplex asynchronous serial interface with wake-up capability; enables low-power remote monitoring and diagnostics over RS-232/RS-485 links. |
| Max Clock Frequency | 4 MHz at 5 V; defines maximum instruction throughput (≈2 MIPS) and peripheral timing margins for deterministic response. |
| Supply Voltage | 4.5 V to 5.5 V; ensures compatibility with standard 5 V logic systems and tolerance against automotive battery ripple. |
Pinout & Package
XC705B32CFNE is housed in a 52-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead configuration, designed for surface-mount reflow assembly and high-reliability thermal cycling performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD / VSS | Power supply / Ground | Dual VDD pins (pins 1, 26) and dual VSS pins (pins 2, 27) provide low-impedance power distribution and noise rejection for mixed-signal operation. |
| OSC1 / OSC2 | Crystal/resonator interface | Supports 1–4 MHz crystal or ceramic resonator; internal oscillator circuit eliminates need for external clock generator. |
| RESET | Active-low reset input | Asynchronous reset assertion clears CPU registers and initializes peripherals; compatible with pushbutton or supervisory IC reset sources. |
| IRQ | Interrupt request input | Level-sensitive, maskable interrupt input for external event handling (e.g., safety switch closure, fault detection). |
| RDI / TDO / SCLK | SCI serial I/O | Three-wire SCI interface (receive, transmit, clock) enables synchronous or asynchronous communication with host controllers or diagnostic tools. |
| PLMA / PLMB | Pulse-length modulation outputs | Dedicated digital outputs for generating variable-duty-cycle waveforms; require external RC filter to produce analog-equivalent DC voltage. |
| PA0–PA7 / PB0–PB7 / PC0–PC7 / PD0–PD7 | Bi-directional I/O ports | Four 8-bit ports with individually configurable direction (via DDRA–DDRC); PD pins double as ADC inputs (AN0–AN7) for sensor multiplexing. |
Key Features
| Feature | Design Value |
|---|---|
| Self-check ROM | On-chip ROM integrity verification during startup ensures firmware authenticity before execution-critical for safety-critical automotive modules. |
| EEPROM endurance | 10,000 erase/write cycles with data retention >10 years; supports field-updatable calibration tables and device-specific configuration storage. |
| Low-power STOP mode | Current draw <10 µA at 5 V; enables battery-backed operation in always-on systems such as vehicle entry controllers or smart locks. |
| SCI wake-up capability | Idle-line and address-mark detection allow microcontroller to remain in WAIT mode until targeted serial command arrives-reducing average system power by >90%. |
| PLM resolution | 8-bit programmable duty cycle (0–255 steps) per channel; delivers 0.4% resolution for precise analog output control without DAC hardware. |
| ADC reference | Internal 2.5 V bandgap reference; eliminates need for external precision voltage reference and simplifies PCB layout for sensor front-ends. |
Applications
| Automotive Body Control Module | Industrial Temperature Sensor Node |
|---|---|
|
Use Scenario: Centralized control of door locks, window lifts, and interior lighting in passenger vehicles. IC Role / Device Role / Timing Role: Main system controller executing state machines, managing I/O polling, and coordinating CAN-linked subsystems via SCI-to-CAN bridge. Use Value: Integrated 32 KB ROM stores complete BCU firmware; EEPROM retains user preferences (e.g., auto-up/down window position) across battery disconnects. |
Use Scenario: Standalone wired temperature monitor in HVAC ducts or factory machinery enclosures. IC Role / Device Role / Timing Role: Sensor acquisition node converting thermistor voltage to digital value, applying linearization, and transmitting via SCI to PLC or gateway. Use Value: On-chip 8-channel ADC interfaces up to eight NTC sensors; PLM outputs drive proportional fan speed control based on averaged temperature readings. |
| Home Appliance Motor Controller | Smart Power Outlet with Load Monitoring |
|
Use Scenario: Speed and direction control of universal motors in washing machines or vacuum cleaners. IC Role / Device Role / Timing Role: Real-time motor commutation sequencer using timer-based PWM generation and zero-cross detection via port interrupts. Use Value: Programmable timer with input capture measures back-EMF timing; PLM outputs drive triac gate drivers for phase-angle control without external PWM IC. |
Use Scenario: Energy-monitoring outlet that detects plug-in events, measures load current, and reports anomalies via serial link. IC Role / Device Role / Timing Role: Embedded supervisor monitoring AC zero-cross (via optocoupler on PD0), sampling current shunt voltage, and logging peak demand. Use Value: Built-in ADC samples shunt voltage at 10 kSPS; EEPROM stores cumulative kWh count and last 10 overcurrent events with timestamps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68HC705B16CP | 16 KB ROM, same 52-pin PLCC package, identical peripheral set except reduced ADC channels (4 vs. 8) and no PLM outputs. | Suitable for simpler control tasks with fewer analog inputs or no analog output requirements (e.g., basic relay controllers). | Select when firmware size ≤16 KB and PLM/ADC channel count can be reduced-offers lower unit cost and identical pinout. |
| MC908GP32CFUE | Enhanced M68HC08 core, 32 KB FLASH (not mask ROM), 1 KB RAM, 512 B EEPROM, same 52-pin PLCC, added SPI and enhanced SCI. | Enables field firmware updates and larger control algorithms; requires FLASH programming infrastructure but improves long-term design flexibility. | Choose for new designs requiring reprogrammability or future feature expansion-requires minor software migration but shares peripheral register mapping. |
Compared with XC705B32CFNE, MC68HC705B16CP offers cost savings at the expense of analog I/O capability, while MC908GP32CFUE trades mask-ROM permanence for FLASH-based field upgradeability and expanded communication options-both retain mechanical and basic electrical compatibility for board reuse where feasible.
Availability
XC705B32CFNE 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-lifecycle support.
Supply support for XC705B32CFNE 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-grade reliability and broad MCU portfolio coverage.
The MC68HC05 family-including XC705B32CFNE-was engineered for cost-sensitive, high-volume embedded control applications demanding deterministic real-time response, low power, and integrated analog peripherals.
FAQ
What is the memory architecture of the XC705B32CFNE?
The XC705B32CFNE features a fixed memory map with 32 KB of mask-programmed ROM for firmware, 256 bytes of volatile RAM for runtime variables, and 128 bytes of EEPROM for nonvolatile configuration storage. The ROM is programmed at wafer level and cannot be modified post-manufacture, ensuring firmware integrity in safety-critical deployments. All memory blocks are directly accessible via the M68HC05 CPU's unified address space.
Does the XC705B32CFNE support in-circuit debugging or programming?
No, the XC705B32CFNE does not support in-circuit debugging or reprogramming. As a mask-ROM device, its firmware is permanently embedded during fabrication. Development requires external EPROM emulators or compatible MC68HC05B32 variants with EPROM/FLASH. Debugging relies on SCI-based printf-style tracing or external logic analyzers monitoring port pins and timer signals.
What are the power supply requirements for reliable operation of the XC705B32CFNE?
The XC705B32CFNE requires a regulated 5 V ±5% supply (4.5 V to 5.5 V) with bypass capacitors (0.1 µF ceramic + 10 µF tantalum) placed near VDD pins 1 and 26. Operation outside this range risks undefined behavior, especially in ADC and EEPROM functions. The device draws up to 25 mA at 4 MHz and drops to <10 µA in STOP mode-making it suitable for battery-backed systems with proper decoupling.
How is the analog-to-digital converter configured and used on the XC705B32CFNE?
The XC705B32CFNE integrates an 8-channel, 8-bit successive-approximation ADC using Port D pins (PD0–PD7) as analog inputs. Configuration is done via the A/D status/control register (ADSTAT), selecting channel, enabling conversion, and reading results from ADDATA. It uses an internal 2.5 V bandgap reference, eliminating external components, and supports conversions triggered by software or timer overflow-ideal for periodic sensor sampling in closed-loop control.
Can the XC705B32CFNE operate in low-power modes, and how are they entered?
Yes, the XC705B32CFNE supports three low-power modes: STOP (<10 µA), WAIT (~100 µA), and SLOW (reduced CPU clock). STOP mode halts the oscillator and disables all peripherals except RESET and IRQ; it is entered via the STOP instruction. WAIT mode stops the CPU but keeps peripherals active and is exited by any interrupt. SLOW mode reduces internal clock frequency using the SLOW bit in the miscellaneous register-used for background tasks with relaxed timing constraints.
XC705B32CFNE 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:
- 32KB (32K x 8)
- Program Memory Type:
- OTP
- EEPROM Size:
- 256 x 8
- RAM Size:
- 528 x 8
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 5.5V
- Data Converters:
- A/D 8x8b; D/A 2x8b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
XC705B32CFNE FAQ
1.How can I place an order for XC705B32CFNE through Aetrix?
Please submit a Request for Quotation (RFQ) for XC705B32CFNE 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 XC705B32CFNE reliable?
The price and inventory of XC705B32CFNE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for XC705B32CFNE is usually 5 days.
3.What payment methods are accepted for XC705B32CFNE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for XC705B32CFNE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for XC705B32CFNE?
XC705B32CFNE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your XC705B32CFNE 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 XC705B32CFNE?
For technical support, including XC705B32CFNE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your XC705B32CFNE requirements.
6.How does Aetrix verify that XC705B32CFNE is sourced from the original manufacturer or authorized distributors?
All XC705B32CFNE 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 XC705B32CFNE meets industry standards.
7.What is the process for return or replacement of XC705B32CFNE?
All XC705B32CFNE units undergo pre-shipment inspection (PSI). If there is an issue with XC705B32CFNE, 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 XC705B32CFNE part is unused and in its original packaging.
Return procedure for XC705B32CFNE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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