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NXP Semiconductors MCHSC705C8ACPE
- Part No.:
- MCHSC705C8ACPE
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
MCHSC705C8ACPE.pdf
- Description:
- IC MCU 8BIT 8KB OTP 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,931
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Product details
Overview
MCHSC705C8ACPE from Freescale Semiconductor is an 8-bit microcontroller unit (MCU) based on the HC05 core, featuring 8 KB of on-chip ROM, 256 bytes of RAM, and a 16-bit timer module. It operates at up to 4 MHz with single-chip mode and supports asynchronous serial communication (SCI). It is used in legacy automotive body control modules and industrial sensor interface applications.
For engineers reviewing the MCHSC705C8ACPE datasheet, MCHSC705C8ACPE pinout, MCHSC705C8ACPE application, or MCHSC705C8ACPE equivalent, key selection considerations include ROM size, SCI compatibility, oscillator configuration options, and availability of mask-programmed variants for cost-sensitive production.
Technical Context
The MCHSC705C8ACPE implements the Motorola HC05 CPU core with instruction set compatibility to the MC6805 family. It integrates a 16-bit timer with input capture/output compare and free-running counter functionality, plus a synchronous serial peripheral interface (SPI) and asynchronous serial communications interface (SCI).
It supports single-chip operation using an internal oscillator circuit or external crystal/resonator up to 4 MHz. Memory mapping includes 8 KB of mask-ROM programmed at fabrication, 256 bytes of static RAM, and 64 bytes of register space - all accessible via unified address space.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | HC05 8-bit CISC architecture, binary-compatible with MC6805 instruction set |
| ROM Size | 8 KB mask-programmed ROM - fixed firmware image, no field reprogramming |
| RAM Size | 256 bytes on-chip static RAM - usable for stack, variables, and temporary data storage |
| Max Clock Frequency | 4 MHz system clock - determines instruction throughput and peripheral timing margins |
| Timer Module | 16-bit timer with input capture, output compare, and free-running counter - enables precise event timing and PWM generation |
| Serial Interfaces | SCI (asynchronous UART) and SPI (synchronous master/slave) - supports host communication and peripheral daisy-chaining |
| Operating Voltage | 5.0 V ±10% - requires stable regulated supply; not compatible with 3.3 V logic domains |
Pinout & Package
Package: 48-pin Plastic Leaded Chip Carrier (PLCC-48), JEDEC MS-026AC compliant, with center power/ground pad for thermal and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PA0–PA7 | Port A bidirectional I/O | 8-bit general-purpose port with pull-up capability; default reset state is input |
| PB0–PB7 | Port B bidirectional I/O | 8-bit general-purpose port; PB0–PB3 double as timer input capture pins |
| PC0–PC7 | Port C bidirectional I/O | 8-bit port; PC0–PC1 serve as SCI transmit/receive; PC2–PC3 as SPI clock/MOSI |
| XTAL1/EXTAL | Oscillator input | Accepts external crystal (1–4 MHz) or TTL-level clock source for system timing |
| RESET | Active-low reset input | Asynchronous reset signal; must be held low ≥2 cycles after VDD stabilization |
| VDD, VSS | Power supply terminals | Single 5 V supply; multiple VSS pins ensure low-impedance ground return paths |
Key Features
| Feature | Design Value |
|---|---|
| Mask-programmed ROM | Enables lowest-cost production for fixed-function embedded control without bootloading overhead |
| Integrated 16-bit timer | Supports time-critical tasks including motor commutation timing and pulse-width measurement |
| SCI and SPI interfaces | Allows integration into multi-node systems without external level translators or protocol bridges |
| Single-chip mode operation | Eliminates need for external memory bus components - reduces BOM count and PCB area |
| Industrial temperature range | Rated for –40°C to +85°C operation - suitable for under-hood automotive and factory-floor environments |
Applications
| Automotive Door Module | Industrial Temperature Controller |
|---|---|
Use Scenario: Centralized control of window lift, lock actuation, and mirror adjustment in OEM door modules. IC Role / Device Role / Timing Role: Primary MCU executing pre-programmed logic, managing GPIO-driven relays and monitoring switch inputs. Use Value: Mask-ROM ensures deterministic startup and immunity to firmware corruption in long-life automotive deployments. |
Use Scenario: Standalone PID-based temperature regulation using thermistor feedback and triac-driven heating elements. IC Role / Device Role / Timing Role: Real-time sensor sampling, control loop execution, and zero-crossing synchronized output switching. Use Value: Integrated 16-bit timer enables accurate 50/60 Hz zero-cross detection and phase-angle control timing. |
| Legacy Engine Control Unit | Appliance Motor Drive Interface |
Use Scenario: Low-complexity ignition timing and fuel pump control in carbureted small-engine applications. IC Role / Device Role / Timing Role: Timing-critical event generator using input capture for crankshaft position sensing. Use Value: Input capture capability on Port B allows precise measurement of variable reluctor sensor pulses without CPU polling. |
Use Scenario: Fan speed control and safety interlock management in HVAC blower assemblies. IC Role / Device Role / Timing Role: GPIO-managed relay sequencing and SCI-based status reporting to main controller. Use Value: SCI interface enables diagnostic logging and parameter updates over existing service wiring, avoiding new communication hardware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68HC705C8P | Same HC05 core, identical ROM/RAM/timer specs, but in 40-pin DIP package - no PLCC footprint compatibility | Limited to through-hole prototyping or legacy wave-soldered boards; lacks PLCC thermal performance | Select when board redesign for surface-mount is not feasible and thermal load is low |
| MC908GP32CPBE | Enhanced HC08 core, 32 KB FLASH, 1 KB RAM, enhanced SCI/SPI, 8 MHz max clock - not mask-ROM | Supports field firmware updates and larger control algorithms; requires FLASH programming infrastructure | Select when future feature expansion, diagnostics, or reprogrammability are required |
Compared with MC68HC705C8P and MC908GP32CPBE, the MCHSC705C8ACPE offers optimal cost and reliability for fixed-function, high-volume automotive and industrial control where firmware immutability and thermal robustness in PLCC packaging are critical design requirements.
Availability
MCHSC705C8ACPE is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and legacy engine management systems requiring stable component supply and long-term obsolescence support.
Supply support for MCHSC705C8ACPE 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 was a U.S.-based semiconductor company specializing in embedded processors, analog, and connectivity solutions before its acquisition by NXP Semiconductors in 2015.
The MCHSC705C8ACPE belongs to the HC05-based microcontroller family designed for cost-sensitive, high-reliability 8-bit control in automotive and industrial environments where mask-ROM firmware and proven silicon longevity are essential.
FAQ
What is the maximum operating frequency of the MCHSC705C8ACPE?
The MCHSC705C8ACPE operates at a maximum system clock frequency of 4 MHz. This limit applies whether using an external crystal (1–4 MHz) or TTL-level clock source on the XTAL1 pin. Exceeding this frequency may cause instruction timing violations, timer overflow miscalculation, or SCI baud rate inaccuracy. The MCHSC705C8ACPE does not support internal PLL multiplication or higher-frequency modes.
Is the MCHSC705C8ACPE pin-compatible with other HC05-family MCUs?
The MCHSC705C8ACPE uses a 48-pin PLCC package with a specific pin assignment defined in Freescale's HC05 documentation. While functionally similar to the MC68HC705C8P, it is not pin-compatible due to differing pin counts (40 vs. 48) and incompatible signal mapping. Direct substitution requires PCB layout revision. The MCHSC705C8ACPE pinout is unique to its PLCC variant and must be verified against Freescale document M68HC705C8A/D.
Does the MCHSC705C8ACPE support in-circuit programming or firmware updates?
No, the MCHSC705C8ACPE contains 8 KB of mask-programmed ROM, which is permanently written during wafer fabrication and cannot be altered in-system or in-field. Firmware changes require ordering a new mask version and full production re-spin. For field-upgradable alternatives, consider FLASH-based derivatives like the MC908GP32CPBE - but note that those are not drop-in replacements for the MCHSC705C8ACPE.
What oscillator configurations does the MCHSC705C8ACPE support?
The MCHSC705C8ACPE supports two oscillator modes: (1) external crystal/resonator (1–4 MHz) connected between XTAL1 and XTAL2, and (2) external TTL-level clock applied to XTAL1 with XTAL2 grounded. It does not support internal RC oscillators or ceramic resonators without external load capacitors. Startup time is specified as ≤1024 oscillator cycles after VDD reaches 4.5 V.
What is the temperature rating for the MCHSC705C8ACPE?
The MCHSC705C8ACPE is rated for operation across the industrial temperature range of –40°C to +85°C. This specification is validated per Freescale's qualification testing and applies to the PLCC-48 package variant. Operation outside this range may result in undefined behavior, increased leakage current, or permanent parametric shift. Derating guidelines for extended life at high ambient temperatures are provided in Freescale application note AN1223.
MCHSC705C8ACPE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 40-DIP (0.600", 15.24mm)
- Series:
- HC05
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- HC05
- Core Size:
- 8-Bit
- Speed:
- 4MHz
- Connectivity:
- SCI, SPI
- Peripherals:
- POR, WDT
- Number of I/O:
- 24
- Program Memory Size:
- 8KB (8K x 8)
- Program Memory Type:
- OTP
- EEPROM Size:
- -
- RAM Size:
- 304 x 8
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 5.5V
- Data Converters:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
MCHSC705C8ACPE FAQ
1.How can I place an order for MCHSC705C8ACPE through Aetrix?
Please submit a Request for Quotation (RFQ) for MCHSC705C8ACPE 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 MCHSC705C8ACPE reliable?
The price and inventory of MCHSC705C8ACPE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCHSC705C8ACPE is usually 5 days.
3.What payment methods are accepted for MCHSC705C8ACPE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCHSC705C8ACPE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCHSC705C8ACPE?
MCHSC705C8ACPE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCHSC705C8ACPE 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 MCHSC705C8ACPE?
For technical support, including MCHSC705C8ACPE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCHSC705C8ACPE requirements.
6.How does Aetrix verify that MCHSC705C8ACPE is sourced from the original manufacturer or authorized distributors?
All MCHSC705C8ACPE 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 MCHSC705C8ACPE meets industry standards.
7.What is the process for return or replacement of MCHSC705C8ACPE?
All MCHSC705C8ACPE units undergo pre-shipment inspection (PSI). If there is an issue with MCHSC705C8ACPE, 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 MCHSC705C8ACPE part is unused and in its original packaging.
Return procedure for MCHSC705C8ACPE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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