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NXP Semiconductors XC68HC705B32CFN
- Part No.:
- XC68HC705B32CFN
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
XC68HC705B32CFN.pdf
- Description:
- IC MCU 8BIT 32KB OTP 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,756
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Product details
Overview
XC68HC705B32CFN from Freescale is a 8-bit HCMOS microcontroller featuring 32 KB on-chip ROM, 256 bytes RAM, 16-channel 8-bit ADC, dual 16-bit programmable timers with input capture/output compare, and an asynchronous serial communications interface (SCI). It operates at up to 4 MHz with 5 V supply and targets embedded control in automotive body electronics and industrial sensor interfaces.
For engineers reviewing the XC68HC705B32CFN datasheet, XC68HC705B32CFN pinout, XC68HC705B32CFN application, or XC68HC705B32CFN equivalent, key selection criteria include ROM size, ADC resolution and channel count, timer architecture, SCI compatibility, and PLCC-52 package compatibility with legacy M68HC05B-family designs.
Technical Context
The XC68HC705B32CFN implements the M68HC05 CPU core with 10-bit address bus extension, supporting up to 64 KB linear memory space. Its instruction set includes bit manipulation, indexed addressing, and read-modify-write operations optimized for real-time I/O control.
It integrates a 16-channel analog multiplexer feeding an 8-bit successive-approximation ADC with conversion time of 25 µs per sample, and two independent 16-bit timers each with two input capture registers (ICR1/ICR2), two output compare registers (OCR1/OCR2), and pulse-length modulation (PLM) capability via PLMA/PLMB registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | M68HC05 8-bit CISC core with 10-bit extended addressing for 64 KB memory map |
| ROM Size | 32 KB mask-programmed ROM - fixed firmware storage without external memory dependency |
| RAM Size | 256 bytes on-chip RAM - sufficient for stack, variables, and SCI buffer in small-control applications |
| ADC Resolution | 8-bit successive-approximation ADC - supports basic sensor digitization (e.g., thermistors, potentiometers) |
| ADC Channels | 16-channel analog input multiplexer - enables multi-sensor monitoring from single device |
| Timer Counters | Dual 16-bit programmable timers - support precise timing, PWM generation, and event capture (e.g., RPM, pulse width) |
| Serial Interface | Asynchronous SCI (2-wire RDI/TDO) - provides UART-like communication at configurable baud rates |
| Supply Voltage | 4.5 V to 5.5 V operation - compatible with standard 5 V logic and automotive battery systems |
Pinout & Package
XC68HC705B32CFN is housed in a 52-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead configuration, lead pitch of 0.05 inch (1.27 mm), and body size 19.05 mm × 19.05 mm. The package supports socket-based prototyping and rework-friendly replacement in legacy systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply | Primary 5 V supply rail; requires local 0.1 µF decoupling to reduce noise coupling into analog and timer circuits |
| VSS | Ground reference | Common return path for digital and analog sections; separation not enforced internally, so PCB layout must minimize noise coupling |
| RESET | Active-low reset input | Asynchronous reset assertion clears CPU registers and initializes peripheral control registers to default states |
| IRQ | Interrupt request input | Level-sensitive, maskable interrupt source used for external event handling (e.g., button press, fault signal) |
| OSC1 / OSC2 | Crystal/resonator interface | Supports 1–4 MHz crystal or ceramic resonator; internal oscillator circuit eliminates need for external clock generator |
| RDI | SCI receive data input | Asynchronous serial input pin compliant with RS-232 voltage levels when buffered; accepts standard UART framing |
| TDO | SCI transmit data output | Open-drain-compatible output; requires pull-up for active-high signaling in TTL/CMOS systems |
| PA0–PA7 | Port A bidirectional I/O | 8-bit general-purpose port with individually configurable direction; default as inputs after reset |
| PB0–PB7 | Port B bidirectional I/O | 8-bit general-purpose port with alternate functions including timer I/O and SCI clock (SCLK) |
| PC0–PC7 | Port C bidirectional I/O | 8-bit port supporting PLM outputs (PLMA/PLMB) and external interrupt sources |
| PD0–PD7/AN0–AN7 | Analog input multiplexer | 8-bit port with 16-channel analog input mapping (AN0–AN15); PD pins serve dual digital/analog role |
Key Features
| Feature | Design Value |
|---|---|
| Mask-programmed 32 KB ROM | Enables cost-effective high-volume production without external boot ROM or flash programming infrastructure |
| 16-channel 8-bit ADC | Reduces component count in sensor-rich systems by integrating multiplexing and conversion logic on-die |
| Dual 16-bit timers with I/O capture | Supports simultaneous measurement of multiple time-critical events (e.g., motor phase timing + fault pulse width) |
| SCI with wake-up capability | Allows low-power standby mode with selective wake-up via idle-line or address-mark detection on RDI |
| STOP/WAIT/SLOW power modes | Extends battery life in portable or automotive modules by reducing current draw to <10 µA in STOP mode |
| On-chip COP watchdog | Prevents system lockup by forcing hardware reset if firmware fails to service watchdog within timeout window |
Applications
| Automotive Body Control | Industrial Sensor Hub |
|---|---|
Use Scenario: Centralized control of door locks, interior lighting, and mirror adjustment in entry-level vehicles. IC Role / Device Role / Timing Role: Main controller executing state-machine logic, reading switch inputs, driving relays/LEDs, and communicating diagnostic data via SCI. Use Value: 32 KB ROM accommodates full feature set without external code storage; 16-channel ADC monitors multiple potentiometers and thermistors for cabin climate feedback. |
Use Scenario: Local data aggregation from temperature, humidity, and pressure sensors in factory-floor monitoring nodes. IC Role / Device Role / Timing Role: Sensor interface MCU performing periodic sampling, linearization, and UART packet formatting before transmission to PLC or gateway. Use Value: Dual timers enable precise 1-second sampling interval and independent watchdog timeout; PLM outputs drive LED status indicators directly. |
| Appliance Motor Control | Legacy Industrial Panel |
Use Scenario: Speed and direction control of small BLDC or universal motors in HVAC blowers and washing machine pumps. IC Role / Device Role / Timing Role: Real-time commutation sequencer using timer output compare to generate phase-switching signals and ADC to monitor back-EMF or current sense. Use Value: 16-bit timer resolution allows sub-millisecond timing accuracy required for 3-phase commutation; 8-bit ADC provides adequate dynamic range for current feedback scaling. |
Use Scenario: Retrofit controller for aging industrial HMI panels requiring replacement of obsolete MC68HC05B-series parts. IC Role / Device Role / Timing Role: Drop-in functional replacement preserving existing PLCC-52 footprint, pinout, and firmware binary compatibility. Use Value: Identical instruction set and memory map to MC68HC05B6/B16 ensures zero-modification firmware reuse; same PLCC-52 mechanical fit avoids PCB redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68HC705B16N | 16 KB ROM, identical pinout and peripheral set but reduced program memory capacity | Suitable where firmware size is under 16 KB and cost sensitivity outweighs future scalability needs | Select when firmware footprint is confirmed ≤16 KB and long-term supply of B16N is secured |
| MC68HC05B32 | Same 32 KB ROM and PLCC-52 package but lacks on-chip EEPROM and has different reset vector mapping | Applicable in non-field-upgradable systems where EEPROM-based parameter storage is unnecessary | Choose when EEPROM functionality is unused and legacy B32 mask ROM availability is preferred |
Compared with XC68HC705B32CFN, MC68HC705B16N offers lower memory capacity at reduced cost, while MC68HC05B32 provides identical ROM size but omits EEPROM - making XC68HC705B32CFN optimal for applications needing both large firmware space and nonvolatile configuration storage.
Availability
XC68HC705B32CFN is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, appliance motor controllers, and legacy industrial panel retrofits requiring stable component supply across extended product lifecycles.
Supply support for XC68HC705B32CFN 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 networking solutions.
The M68HC05 family-including XC68HC705B32CFN-was engineered for cost-sensitive, real-time control applications demanding high reliability, low power, and pin-compatible migration paths across memory and peripheral variants.
FAQ
What is the maximum operating frequency of the XC68HC705B32CFN?
The XC68HC705B32CFN operates at a maximum external clock frequency of 4 MHz, corresponding to a 2 MHz internal bus speed due to its two-phase internal clock derivation. This timing is validated across the full 4.5 V to 5.5 V supply range and commercial temperature grade (0°C to +70°C), ensuring deterministic instruction execution in timing-critical control loops.
Does the XC68HC705B32CFN include on-chip EEPROM memory?
Yes, the XC68HC705B32CFN integrates 128 bytes of on-chip EEPROM organized as 64 words × 16 bits, accessible via dedicated EEPROM control register (EECR) and supporting byte-level erase and write operations. This memory retains calibration data and user settings across power cycles without external components.
What package type is used for the XC68HC705B32CFN?
The XC68HC705B32CFN uses a 52-pin Plastic Leaded Chip Carrier (PLCC) package with J-leads, standardized mechanical dimensions (19.05 mm × 19.05 mm body, 0.05 inch pitch), and pinout fully compatible with other M68HC05B-family devices in the same package variant.
Can the XC68HC705B32CFN operate from a 3.3 V supply?
No, the XC68HC705B32CFN is specified only for 4.5 V to 5.5 V operation per its DC electrical characteristics. It lacks 3.3 V logic compatibility, and attempting 3.3 V supply will result in undefined behavior, failed ADC conversions, and unreliable timer operation due to insufficient internal voltage margins.
Is the XC68HC705B32CFN pin-compatible with the MC68HC05B6?
No, the XC68HC705B32CFN is not pin-compatible with the MC68HC05B6. While both use PLCC-52 packages, their pin assignments differ significantly - particularly for timer I/O (TCAP1/TCMP1), PLM outputs (PLMA/PLMB), and ADC channel routing - requiring PCB layout changes for substitution.
XC68HC705B32CFN 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:
XC68HC705B32CFN FAQ
1.How can I place an order for XC68HC705B32CFN through Aetrix?
Please submit a Request for Quotation (RFQ) for XC68HC705B32CFN 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 XC68HC705B32CFN reliable?
The price and inventory of XC68HC705B32CFN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for XC68HC705B32CFN is usually 5 days.
3.What payment methods are accepted for XC68HC705B32CFN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for XC68HC705B32CFN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for XC68HC705B32CFN?
XC68HC705B32CFN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your XC68HC705B32CFN 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 XC68HC705B32CFN?
For technical support, including XC68HC705B32CFN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your XC68HC705B32CFN requirements.
6.How does Aetrix verify that XC68HC705B32CFN is sourced from the original manufacturer or authorized distributors?
All XC68HC705B32CFN 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 XC68HC705B32CFN meets industry standards.
7.What is the process for return or replacement of XC68HC705B32CFN?
All XC68HC705B32CFN units undergo pre-shipment inspection (PSI). If there is an issue with XC68HC705B32CFN, 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 XC68HC705B32CFN part is unused and in its original packaging.
Return procedure for XC68HC705B32CFN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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