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NXP Semiconductors XC68HC705B32CB
- Part No.:
- XC68HC705B32CB
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 56-SDIP (0.600", 15.24mm)
- Datasheet:
-
XC68HC705B32CB.pdf
- Description:
- IC MCU 8BIT 32KB OTP 56PSDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,642
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Product details
Overview
XC68HC705B32CB from Freescale is a 8-bit HCMOS microcontroller featuring 32 KB on-chip ROM, 256 bytes RAM, 8-channel 8-bit ADC, dual 16-bit programmable timer 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 XC68HC705B32CB datasheet, XC68HC705B32CB pinout, XC68HC705B32CB application, or XC68HC705B32CB equivalent, key selection criteria include ROM size, integrated ADC resolution and channel count, timer architecture (dual 16-bit with capture/compare), SCI compatibility with legacy M68HC05 protocols, and PLCC-52 package thermal and routing constraints.
Technical Context
The XC68HC705B32CB implements the M68HC05 CPU core with 10-bit address extension, supporting up to 64 KB linear address space via bank switching. Its memory map includes fixed interrupt vectors, on-chip ROM starting at $E000, and RAM mirrored across $0000–$00FF and $0100–$01FF.
It integrates a 16-bit programmable timer subsystem with two independent input capture registers (ICR1/ICR2), two output compare registers (OCR1/OCR2), and pulse length modulation (PLM) outputs on PLMA/PLMB pins. The SCI supports full-duplex asynchronous communication with programmable baud rate and wake-up modes (idle line/address mark).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | M68HC05 8-bit CISC core with 10-bit extended addressing; enables direct access to 1 KB of I/O and peripheral registers without banking overhead. |
| ROM Size | 32 KB mask-programmed ROM ($E000–$FFFF); provides non-volatile program storage without external memory interface. |
| RAM Size | 256 bytes static RAM ($0000–$00FF and $0100–$01FF); supports stack, variables, and SCI buffer without external SRAM. |
| ADC | 8-channel 8-bit successive approximation ADC; allows simultaneous monitoring of multiple analog sensors (e.g., temperature, pressure, potentiometer) with software-triggered conversion. |
| Timer | Dual 16-bit timer with input capture (ICR1/ICR2), output compare (OCR1/OCR2), and PLM generation; supports precise PWM motor control, pulse-width measurement, and time-stamped event logging. |
| SCI Interface | Asynchronous serial interface with RDI/TDO/SCLK pins; compatible with RS-232/RS-485 transceivers and supports low-power wake-up from STOP/WAIT modes. |
| Supply Voltage | 4.5 V to 5.5 V DC; ensures robust operation in automotive 12 V battery systems with typical regulation and noise margins. |
| Max Clock Frequency | 4 MHz (with external crystal/resonator on OSC1/OSC2); defines real-time instruction throughput limit for deterministic control loops. |
Pinout & Package
XC68HC705B32CB is housed in a 52-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead configuration, rated for industrial temperature range (–40°C to +85°C) and surface-mount assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply | Primary 5 V supply input; requires local 0.1 µF ceramic decoupling adjacent to pin for stable core and peripheral operation. |
| VSS | Ground reference | Digital ground return; must be connected to system ground plane with low-inductance path to minimize noise coupling into ADC and timer circuits. |
| RESET | Active-low reset input | Asynchronous reset assertion clears CPU registers and forces boot from $FFFE–$FFFF vector; pulled high externally via 10 kΩ resistor. |
| IRQ | Interrupt request input | Level-sensitive, edge-triggered interrupt source; used for external event synchronization (e.g., switch closure, sensor alert) with priority below NMI. |
| OSC1 / OSC2 | Crystal/resonator interface | Connects to 1–4 MHz parallel-resonant crystal or ceramic resonator; internal oscillator circuit eliminates need for external clock generator. |
| RDI | Serial receive data input | SCI asynchronous RX input; accepts TTL/CMOS-level signals; supports idle-line and address-mark wake-up during low-power modes. |
| TDO | Serial transmit data output | SCI asynchronous TX output; drives open-drain or push-pull logic depending on SCCR2 configuration; compatible with standard level shifters. |
| PLMA / PLMB | Pulse length modulation outputs | Dedicated PWM outputs with programmable duty cycle and frequency; used for LED dimming, fan speed control, or analog signal emulation. |
| PA0–PA7 / PB0–PB7 / PC0–PC7 | General-purpose I/O ports | Three 8-bit bidirectional ports with individual direction control (DDRA/DDRB/DDRC); support interrupt-on-change and pull-up enable via internal options. |
| PD0–PD7 (AN0–AN7) | Analog input multiplexer | Port D functions as 8-channel analog input for ADC; each pin configurable as digital I/O or analog input via ADSTAT register bit settings. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 32 KB ROM | Eliminates external program memory, reducing BOM cost and PCB area while ensuring firmware immutability in production units. |
| 8-channel 8-bit ADC | Enables direct acquisition from multiple analog sensors without external ADC ICs or signal conditioning chains, simplifying system architecture. |
| Dual 16-bit timer with capture/compare | Supports simultaneous measurement of incoming pulse widths and generation of precise timing events-critical for motor commutation and encoder decoding. |
| SCI with wake-up capability | Allows microcontroller to remain in STOP mode until serial activity occurs, extending battery life in remote sensor nodes or telematics modules. |
| PLM outputs (PLMA/PLMB) | Provides hardware-based PWM generation independent of CPU execution, freeing processor cycles for higher-layer control tasks. |
| Industrial temperature grade (–40°C to +85°C) | Validated for operation in under-hood automotive environments and factory-floor industrial controllers without derating or thermal management overhead. |
Applications
| Automotive Body Control Module | Industrial Temperature Monitor |
|---|---|
|
Use Scenario: Centralized control of door locks, window lifts, mirror adjustment, and interior lighting in passenger vehicles. IC Role / Device Role / Timing Role: Main system controller executing state machines, polling switches/sensors, driving relays/LEDs, and communicating via SCI with gateway ECUs. Use Value: Integrated 32 KB ROM stores complete vehicle-specific logic; 8-channel ADC reads cabin temperature, humidity, and ambient light; PLMA/PLMB drive PWM-controlled LED backlighting. |
Use Scenario: Standalone DIN-rail mounted unit measuring and logging temperature from up to eight thermistors or RTDs in HVAC ducts or machinery enclosures. IC Role / Device Role / Timing Role: Data acquisition engine performing periodic ADC conversions, applying linearization, formatting SCI packets, and managing non-volatile EEPROM log entries. Use Value: Dual timer enables precise 1-second sampling intervals and watchdog timeout enforcement; 256-byte RAM buffers one full scan before SCI transmission; industrial temp grade ensures field reliability. |
| Smart Appliance Motor Controller | Legacy Industrial PLC I/O Extender |
|
Use Scenario: Variable-speed control of universal motors in washing machines or power tools using phase-angle or PWM techniques. IC Role / Device Role / Timing Role: Real-time motor timing controller generating synchronized gate drive signals based on zero-cross detection and user-set RPM profiles. Use Value: Input capture on TCAP1/TCAP2 measures AC line zero-cross events; OCR1/OCR2 trigger TRIAC firing or MOSFET PWM; PLMA modulates auxiliary fan speed. |
Use Scenario: Retrofit module adding isolated digital I/O and analog sensing to older PLC racks lacking native expansion capabilities. IC Role / Device Role / Timing Role: Protocol bridge translating Modbus ASCII commands over SCI into local port toggling, ADC reads, and status reporting. Use Value: SCI handles host command parsing and response framing; PA/PB/PC provide 24 GPIOs for discrete I/O; PD0–PD7 acquire analog process values (4–20 mA loop inputs via resistive scaling). |
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), 256 B RAM, same 52-pin PLCC, but lacks PLM outputs and has single 16-bit timer. | Better for field-upgradable firmware; unsuitable where hardware PWM or dual capture/compare is required. | Select when firmware updates are needed and PLM/timer features are secondary. |
| XC68HC705C8CB | 8 KB ROM, identical pinout and peripheral set (ADC, SCI, timers), but lower memory density and no PLM outputs. | Cost-optimized for simpler control tasks; cannot replace XC68HC705B32CB in designs requiring >16 KB code space or PLM-driven analog emulation. | Choose only if application fits within 8 KB ROM and does not use PLMA/PLMB functionality. |
Compared with MC68HC908JB8 and XC68HC705C8CB, the XC68HC705B32CB delivers highest on-chip program storage and unique PLM capability-making it irreplaceable in fixed-function, high-channel-count embedded controllers where flash reprogramming is unnecessary and analog output fidelity matters.
Availability
XC68HC705B32CB is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, smart appliance motor control, and legacy PLC I/O extension requiring stable component supply across multi-year production cycles.
Supply support for XC68HC705B32CB 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, analog, and mixed-signal ICs for automotive, industrial, and consumer markets.
The M68HC05 family-including XC68HC705B32CB-was engineered for cost-sensitive, high-reliability 8-bit control applications where ROM-based firmware, integrated peripherals, and industrial temperature tolerance were essential design requirements.
FAQ
What is the maximum operating frequency of the XC68HC705B32CB?
The XC68HC705B32CB supports a maximum external clock frequency of 4 MHz when using a crystal or ceramic resonator on OSC1/OSC2. This corresponds to a 1 µs instruction cycle time for most instructions. Operation above 4 MHz is not guaranteed and may cause timing violations in the ADC, timer, or SCI subsystems. The XC68HC705B32CB datasheet specifies electrical characteristics only up to 4 MHz under 4.5–5.5 V supply conditions.
Does the XC68HC705B32CB include on-chip EEPROM memory?
No, the XC68HC705B32CB does not include on-chip EEPROM. It contains 32 KB of mask-programmed ROM for program storage and 256 bytes of static RAM for data. Unlike later HC05 variants such as the MC68HC705B16, the XC68HC705B32CB relies on external non-volatile memory or factory programming for configuration data persistence. The XC68HC705B32CB datasheet confirms absence of EEPROM control registers (EECR) and related programming logic.
Can the XC68HC705B32CB operate from a 3.3 V supply?
No, the XC68HC705B32CB is specified only for 4.5 V to 5.5 V operation. Its internal voltage regulator, oscillator circuitry, and I/O buffers are designed for 5 V HCMOS logic levels. Attempting 3.3 V operation will result in undefined behavior, including failure to execute instructions, ADC inaccuracies, and SCI communication dropouts. The XC68HC705B32CB electrical specifications table explicitly lists VDD min = 4.5 V and does not define DC characteristics below that threshold.
What debugging or programming interface does the XC68HC705B32CB support?
The XC68HC705B32CB supports a serial bootstrap loader via its RDI/TDO/SCLK pins, enabling in-system programming through a UART interface using Motorola's standard protocol. It does not include JTAG or BDM debug interfaces. Programming requires a dedicated serial loader tool or custom host software that implements the MC68HC05 serial bootstrap command set. The XC68HC705B32CB datasheet details timing and handshaking requirements for this mode in Section 2.2 ("Serial RAM loader").
Is the XC68HC705B32CB pin-compatible with other MC68HC705 family members?
The XC68HC705B32CB is pin-compatible with other 52-pin PLCC variants in the MC68HC705Bx series-including XC68HC705B16CB and XC68HC705B5CB-but not with QFP or SDIP packages. Pin assignments for VDD, VSS, RESET, IRQ, OSC1/OSC2, RDI/TDO/SCLK, PLMA/PLMB, and port pins (PA–PD) match across these PLCC versions. However, differences in on-chip ROM size and peripheral enablement require firmware validation; the XC68HC705B32CB retains full functional compatibility at the pin level within this package footprint.
XC68HC705B32CB 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:
- 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:
- Through Hole
- Supplier Device Package:
XC68HC705B32CB FAQ
1.How can I place an order for XC68HC705B32CB through Aetrix?
Please submit a Request for Quotation (RFQ) for XC68HC705B32CB 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 XC68HC705B32CB reliable?
The price and inventory of XC68HC705B32CB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for XC68HC705B32CB is usually 5 days.
3.What payment methods are accepted for XC68HC705B32CB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for XC68HC705B32CB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for XC68HC705B32CB?
XC68HC705B32CB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your XC68HC705B32CB 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 XC68HC705B32CB?
For technical support, including XC68HC705B32CB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your XC68HC705B32CB requirements.
6.How does Aetrix verify that XC68HC705B32CB is sourced from the original manufacturer or authorized distributors?
All XC68HC705B32CB 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 XC68HC705B32CB meets industry standards.
7.What is the process for return or replacement of XC68HC705B32CB?
All XC68HC705B32CB units undergo pre-shipment inspection (PSI). If there is an issue with XC68HC705B32CB, 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 XC68HC705B32CB part is unused and in its original packaging.
Return procedure for XC68HC705B32CB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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