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NXP Semiconductors MC68HC705P6AMDW
- Part No.:
- MC68HC705P6AMDW
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC68HC705P6AMDW.pdf
- Description:
- IC MCU 8BIT 4.5KB OTP 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,383
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Product details
Overview
MC68HC705P6AMDW from Freescale Semiconductor is a 5V, 8-bit EPROM-based microcontroller featuring an M68HC05 CPU core, 4672 bytes of user EPROM, 176 bytes of on-chip RAM, a 4-channel 8-bit A/D converter, and a 16-bit timer with input capture/output compare. It operates in industrial temperature range (–40°C to +85°C) and supports serial I/O via SIOP - used in embedded sensor interface and motor control subsystems.
For engineers reviewing the MC68HC705P6AMDW datasheet, MC68HC705P6AMDW pinout, MC68HC705P6AMDW application, or MC68HC705P6AMDW equivalent, key selection criteria include EPROM programmability, COP watchdog enable/disable via MOR, SIOP LSB/MSB configuration, and support for STOP/HALT low-power modes in resource-constrained designs.
Technical Context
The MC68HC705P6AMDW integrates a static M68HC05 CPU core running at up to 2.1 MHz bus frequency (fosc/2), with dedicated registers for SIOP (SCR/SSR/SDR), timer control (TCR/TSR), and A/D conversion (ADSC/ADC). Its bootloader ROM (239 bytes) enables in-system programming without external EPROM programmers.
Pin functions are configurable via mask options: IRQ can be edge- or edge-and-level-sensitive; SIOP clock rate is selectable as fosc/8, /16, /32, or /64; and COP watchdog behavior is determined by MOR bit 0. The device supports three low-power modes - WAIT, HALT, and STOP - with different peripheral retention and wake-up sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | M68HC05 8-bit CISC core with 176-byte RAM, 4672-byte user EPROM, and 239-byte bootloader ROM |
| Operating Voltage | 5.0 V ±10% - requires stable regulated supply; VDD/VSS bypassing critical for noise immunity |
| A/D Converter | 4-channel, 8-bit ratiometric ADC with VREFH reference input and internal/external oscillator support |
| Timer System | 16-bit free-running timer with one input capture (PD7/TCAP) and one output compare (TCMP) channel |
| Serial Interface | SIOP synchronous serial port with programmable MSB/LSB-first order and four selectable clock divisors |
| Power Modes | STOP (full clock stop), HALT (CPU halted, peripherals active), WAIT (CPU halted, selected clocks active) |
| Package | 28-pin SOIC (Case 751F), lead-free and RoHS-compliant per Freescale documentation |
Pinout & Package
MC68HC705P6AMDW is housed in a 28-pin Small Outline Integrated Circuit (SOIC) package (Case 751F), surface-mount compatible with standard reflow profiles and JEDEC MS-012AC dimensions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive power supply | Connect to regulated +5 V; requires local 0.1 µF ceramic bypass capacitor |
| VSS | Ground reference | System ground return; must be low-impedance path to minimize noise coupling |
| OSC1 / OSC2 | On-chip oscillator inputs | Support crystal (1–4 MHz), ceramic resonator, or external CMOS clock on OSC1 only |
| RESET | Active-high reset input | Drives MCU to known state; internal POR circuit ensures reliable startup at power-on |
| IRQ/VPP | Maskable interrupt / EPROM programming voltage | Configurable as level/edge-sensitive IRQ; VPP = 12.5 V during EPROM programming |
| PA0–PA7 | Port A bidirectional I/O | Programmable pull-ups and key-scan interrupts enabled via MOR; PC0/PC1 support high-current drive |
| PB5/SDO, PB6/SDI, PB7/SCK | SIOP serial interface pins | Full-duplex synchronous communication; SCK polarity and phase fixed, data order configurable |
| PC0–PC7 | Port C multiplexed I/O | PC3–PC6 serve as A/D inputs AD3–AD0; PC7 = VREFH analog reference input |
| PD5, PD7/TCAP | Port D general-purpose / timer input | PD7 doubles as timer input capture; PD5 is general-purpose I/O with no alternate function |
| TCMP | Timer output compare signal | Open-drain output; toggles or clears on compare match; requires external pull-up for logic-high level |
Key Features
| Feature | Design Value |
|---|---|
| EPROM security lockout | MOR bit enables permanent disable of EPROM readback, preventing firmware reverse engineering |
| Configurable SIOP data order | MSB-first or LSB-first transmission selected at mask time - eliminates software bit-reversal overhead |
| Static COP watchdog | Watchdog enable/disable set permanently via MOR bit - avoids runtime misconfiguration risk |
| High-current I/O capability | PC0 and PC1 support >20 mA sink current - directly drives LEDs or small relays without external drivers |
| Bootloader-assisted programming | 239-byte ROM enables field EPROM reprogramming via SIOP - no dedicated programmer required |
Applications
| Industrial Sensor Interface | Motor Speed Control |
|---|---|
Use Scenario: Monitoring temperature, pressure, and flow sensors in HVAC controllers using analog inputs and digital I/O. IC Role / Device Role / Timing Role: MC68HC705P6AMDW acts as primary sensor acquisition node, performing A/D conversion, filtering, and serial reporting via SIOP. Use Value: Integrated 4-channel 8-bit ADC and programmable SIOP reduce BOM count and PCB area versus discrete ADC + UART solutions. |
Use Scenario: Closed-loop speed regulation of DC brush motors in factory automation equipment using tachometer feedback. IC Role / Device Role / Timing Role: MC68HC705P6AMDW executes PID algorithm, reads tachometer pulses via TCAP input, and generates PWM-equivalent timing via TCMP output. Use Value: Input capture on PD7/TCAP provides precise edge-timing resolution; output compare on TCMP delivers deterministic pulse generation without CPU intervention. |
| Smart Power Metering | Legacy Equipment Retrofit |
Use Scenario: Adding digital telemetry to electromechanical kWh meters using existing 5 V rails and minimal board space. IC Role / Device Role / Timing Role: MC68HC705P6AMDW serves as meter interface controller, reading pulse outputs from mechanical counters and transmitting via SIOP to host MCU. Use Value: Low-power STOP mode extends battery life in auxiliary monitoring units; EPROM retains firmware across power cycles without external memory. |
Use Scenario: Replacing obsolete discrete logic or custom ASICs in aging industrial panels with field-programmable control logic. IC Role / Device Role / Timing Role: MC68HC705P6AMDW implements sequenced I/O control, fault detection, and status reporting using PA–PD ports and COP watchdog. Use Value: Mask option register allows hardware-level configuration matching legacy timing and interrupt behavior - minimizing firmware porting effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68HC705P6ACDW | Same die, but rated for commercial temperature range (0°C to +70°C); identical pinout and EPROM size | Suitable for non-industrial environments where ambient temperature stays within 0–70°C | Select MC68HC705P6ACDW only if operating environment is guaranteed within commercial spec; otherwise use MC68HC705P6AMDW for full industrial range. |
| MC68HC705P6A | Same functional silicon; suffix "DW" denotes SOIC package, while base part number omits package identifier | No functional difference - "MC68HC705P6A" is generic part number used in documentation and ordering matrices | MC68HC705P6A refers to the same device family; MC68HC705P6AMDW is the specific orderable SOIC variant with industrial temp grade. |
Compared with MC68HC705P6ACDW and generic MC68HC705P6A, the MC68HC705P6AMDW offers guaranteed operation from –40°C to +85°C and explicit SOIC packaging - making it the sole choice for new industrial designs requiring extended temperature compliance and surface-mount assembly.
Availability
MC68HC705P6AMDW is available at Aetrix Electronics and suitable for industrial sensor interface, motor control, smart metering, and legacy equipment retrofit applications requiring stable component supply and long-term obsolescence management.
Supply support for MC68HC705P6AMDW 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 the 68HC05 and 68HC11 microcontroller families.
The MC68HC705P6AMDW belongs to the M68HC05 microcontroller product line, designed for cost-sensitive, low-pin-count embedded control applications requiring integrated A/D, serial I/O, and programmable EPROM in a single chip.
FAQ
What is the maximum operating frequency of the MC68HC705P6AMDW?
The MC68HC705P6AMDW supports an oscillator frequency (fosc) up to 4.2 MHz, yielding a maximum bus clock of 2.1 MHz (fosc/2). This timing governs instruction execution, A/D conversion, and SIOP baud rates. Electrical specifications in Chapter 14 confirm stable operation across the full industrial temperature range at this speed when powered at 5.0 V ±10%.
Does the MC68HC705P6AMDW support in-system programming?
Yes, the MC68HC705P6AMDW supports in-system EPROM programming via its built-in 239-byte bootloader ROM and SIOP interface. Programming requires applying 12.5 V to the IRQ/VPP pin while executing the bootloader sequence - no external EPROM programmer is needed. This capability is documented in Chapter 10 and enables field firmware updates.
How is the COP watchdog timer configured on the MC68HC705P6AMDW?
The COP watchdog timer on the MC68HC705P6AMDW is enabled or disabled permanently via bit 0 of the Mask Option Register (MOR), programmed during wafer fabrication. Once set, this configuration cannot be changed in-circuit. If enabled, the COP must be cleared regularly via the COP clear register to prevent reset - behavior confirmed in Chapter 3 and Section 4.3.2.
What A/D reference voltage options does the MC68HC705P6AMDW provide?
The MC68HC705P6AMDW uses a ratiometric A/D architecture where conversion results scale relative to VREFH. Pin PC7 is dedicated to VREFH input, allowing connection to an external precision reference or to VDD for supply-ratiometric measurements. Chapter 9 specifies that VREFH must be between 1.5 V and VDD, and accuracy depends on reference stability and noise rejection.
Can the MC68HC705P6AMDW operate from a 3.3 V supply?
No, the MC68HC705P6AMDW is specified only for 5.0 V ±10% operation. Chapter 14 Electrical Specifications lists absolute maximum ratings and DC characteristics exclusively for 5 V operation. While some marginal functionality may occur at 3.3 V, Freescale does not guarantee timing, A/D accuracy, or EEPROM reliability outside the 4.5–5.5 V range - use only with regulated 5 V supply.
MC68HC705P6AMDW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Series:
- HC05
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- HC05
- Core Size:
- 8-Bit
- Speed:
- 2.1MHz
- Connectivity:
- SIO
- Peripherals:
- POR, WDT
- Number of I/O:
- 21
- Program Memory Size:
- 4.5KB (4.5K x 8)
- Program Memory Type:
- OTP
- EEPROM Size:
- -
- RAM Size:
- 176 x 8
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 5.5V
- Data Converters:
- A/D 4x8b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC68HC705P6AMDW FAQ
1.How can I place an order for MC68HC705P6AMDW through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC705P6AMDW 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 MC68HC705P6AMDW reliable?
The price and inventory of MC68HC705P6AMDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC705P6AMDW is usually 5 days.
3.What payment methods are accepted for MC68HC705P6AMDW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68HC705P6AMDW transactions.
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4.How is shipping managed for MC68HC705P6AMDW?
MC68HC705P6AMDW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68HC705P6AMDW 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 MC68HC705P6AMDW?
For technical support, including MC68HC705P6AMDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC705P6AMDW requirements.
6.How does Aetrix verify that MC68HC705P6AMDW is sourced from the original manufacturer or authorized distributors?
All MC68HC705P6AMDW 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 MC68HC705P6AMDW meets industry standards.
7.What is the process for return or replacement of MC68HC705P6AMDW?
All MC68HC705P6AMDW units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC705P6AMDW, 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 MC68HC705P6AMDW part is unused and in its original packaging.
Return procedure for MC68HC705P6AMDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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