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NXP Semiconductors MC68HC908AP16CB
- Part No.:
- MC68HC908AP16CB
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 42-SDIP (0.600", 15.24mm)
- Datasheet:
-
MC68HC908AP16CB.pdf
- Description:
- IC MCU 8BIT 16KB FLASH 42DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,731
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Product details
Overview
MC68HC908AP16CB from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08-core microcontroller with 16 KB on-chip FLASH, 512 B RAM, and integrated peripherals including SCI, SPI, I²C, ADC (8-channel, 10-bit), TIM, TBM, and CGM with PLL. It operates at up to 8 MHz CPU frequency with internal oscillator or external crystal, and supports 5 V operation in SOIC-28 package. It targets cost-sensitive industrial control and appliance timing applications requiring embedded firmware execution and analog/digital I/O.
For engineers reviewing the MC68HC908AP16CB datasheet, MC68HC908AP16CB pinout, MC68HC908AP16CB application, or MC68HC908AP16CB equivalent, key selection criteria include FLASH size vs. code footprint, ADC resolution and channel count for sensor interfacing, PLL-based clock flexibility for system synchronization, and SOIC-28 footprint compatibility with legacy board layouts.
Technical Context
The MC68HC908AP16CB implements the HCS08 CPU core with 16-bit address space, supporting indexed, extended, and relative addressing modes. Its Clock Generator Module (CGM) integrates a phase-locked loop (PLL) with programmable multipliers (×1 to ×32) and reference dividers, enabling precise bus clock derivation from internal RC or external crystal sources.
Peripherals include a 10-bit successive-approximation ADC with 8 input channels and configurable sample time, a Timer Interface Module (TIM) with input capture, output compare, and PWM generation, and dual serial interfaces: SCI (asynchronous UART) and SPI (synchronous master/slave), plus Multi-Master IIC (MMIIC) for two-wire bus communication.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | HCS08 8-bit architecture with 16-bit address bus; enables efficient C compilation and deterministic interrupt latency. |
| FLASH Memory | 16 KB on-chip FLASH with block protection; supports in-system programming and secure firmware updates. |
| RAM Size | 512 bytes of on-chip RAM; sufficient for stack, variables, and small buffers in real-time control loops. |
| ADC Resolution | 10-bit SAR ADC with 8 single-ended inputs; delivers ±1 LSB INL/DNL for precision temperature or voltage monitoring. |
| Max CPU Frequency | 8 MHz bus clock (derived via PLL); ensures sub-1 µs instruction cycle for fast I/O response in motor control. |
| Supply Voltage | 4.5 V to 5.5 V operation; compatible with standard TTL/CMOS logic rails and industrial 5 V power domains. |
| Package | SOIC-28 (300 mil); surface-mount footprint with 1.27 mm pitch, suitable for automated assembly and thermal reliability. |
Pinout & Package
MC68HC908AP16CB is housed in a 28-pin Small Outline Integrated Circuit (SOIC) package with 300-mil body width and 1.27 mm lead pitch. Thermal resistance θJA is 100°C/W, and maximum junction temperature is +125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dedicated digital power pins; require local 0.1 µF ceramic bypassing for stable core operation. |
| VDDA, VSSA | Analog power and ground | Isolated analog supply domain for ADC and PLL; must be decoupled separately to minimize noise coupling. |
| OSC1, OSC2 | Crystal oscillator terminals | Support external quartz crystals (1–8 MHz) or ceramic resonators; internal load capacitors configurable via CONFIG register. |
| PTA0–PTA7 | Port A bidirectional I/O | 8-bit general-purpose port with pull-up enable; PTA0–PTA3 support keyboard interrupt (KBI) wake-up capability. |
| PTB0–PTB7 | Port B bidirectional I/O | 8-bit port with alternate functions: SCI TX/RX, SPI SCK/MOSI/MISO, IIC SCL/SDA, and TIM/ADC channel mapping. |
| IRQ | External interrupt request | Edge-triggered active-low input; supports high-priority asynchronous event handling (e.g., emergency stop). |
| RESET | Active-low reset input | Asynchronous reset pin; internal POR and LVI circuits provide automatic reset under brownout or power-up conditions. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable PLL clock generator | Enables flexible bus clock synthesis (e.g., 4 MHz from 1 MHz crystal), reducing external clock component count and improving EMI performance. |
| ROM-resident monitor (MON) | Provides in-circuit debugging, FLASH programming, and memory verification without external programmer hardware. |
| Computer Operating Properly (COP) watchdog | Configurable timeout (0.5 ms to 2 s) with software-refresh requirement; prevents runaway code in safety-critical control loops. |
| Low-voltage inhibit (LVI) | Detects supply drops below 4.2 V (typ.) and forces reset, protecting FLASH integrity during brownout conditions. |
| Multi-Master IIC interface | Supports slave and master roles on shared two-wire bus; enables interoperability with sensors, EEPROMs, and display controllers. |
Applications
| Industrial Motor Control | Home Appliance UI |
|---|---|
Use Scenario: Brushless DC motor commutation in HVAC blowers using hall-effect feedback and PWM drive signals. IC Role / Device Role / Timing Role: Real-time controller executing commutation logic, ADC sampling of current/voltage, and generating synchronized 3-phase PWM outputs. Use Value: On-chip 10-bit ADC and TIM with buffered PWM reduce external component count; 16 KB FLASH accommodates field-oriented control algorithms. |
Use Scenario: Keypad scanning, LED display driving, and temperature regulation in microwave ovens. IC Role / Device Role / Timing Role: Central UI processor managing KBI wake-up, SPI-driven segment displays, and analog thermistor readings via ADC. Use Value: Integrated KBI and 8-channel ADC eliminate external scan controllers; MON ROM enables factory calibration and firmware updates. |
| Smart Power Metering | Legacy Industrial PLC I/O |
Use Scenario: Voltage/current sensing and tariff calculation in single-phase energy meters with RS-232/SCI telemetry. IC Role / Device Role / Timing Role: Data acquisition node performing periodic ADC sampling, scaling, and SCI-based data transmission to host MCU. Use Value: 10-bit ADC meets IEC 62053-21 Class 1 accuracy requirements; SCI supports standard metering protocols (DLMS/COSEM). |
Use Scenario: Discrete I/O expansion module for DIN-rail mounted PLCs, interfacing with 24 V sensors and actuators. IC Role / Device Role / Timing Role: Isolated digital I/O concentrator with configurable pull-ups, debounced inputs, and open-drain outputs. Use Value: 16 KB FLASH stores custom I/O mapping logic; SOIC-28 footprint matches legacy carrier board layouts for drop-in replacement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC9RS08KA8 | RS08 core, 8 KB FLASH, no PLL, lower power (1.8–5.5 V), 20-pin SOIC | Lacks PLL and full peripheral set; suited for ultra-low-power sensor nodes, not timing-critical motor control | Select when power budget < 1 mA active and PLL-free clocking suffices; not suitable for 8 MHz deterministic timing. |
| S9KEAZ128AMLH | Kinetis E-series ARM Cortex-M0+, 128 KB FLASH, 16 KB RAM, 48 MHz, QFP-64 | Higher performance, larger memory, modern toolchain; requires PCB redesign and firmware rewrite | Choose for future-proofing or complex protocol stacks (e.g., Modbus TCP); overkill for simple 8-bit control tasks. |
Compared with MC9RS08KA8, the MC68HC908AP16CB offers superior clock flexibility and ADC resolution for analog-intensive control; versus S9KEAZ128AMLH, it provides proven reliability and minimal BOM cost in established 5 V industrial designs.
Availability
MC68HC908AP16CB is available at Aetrix Electronics and suitable for industrial motor control, home appliance UI, smart metering, and legacy PLC I/O applications requiring stable component supply and long-term manufacturing continuity.
Supply support for MC68HC908AP16CB 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
NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT markets, with roots in Freescale's embedded controller heritage.
The MC68HC908AP family was designed for cost-optimized, high-reliability 8-bit control in appliances, industrial panels, and power equipment where deterministic timing and analog integration are critical.
FAQ
What is the maximum operating frequency of the MC68HC908AP16CB?
The MC68HC908AP16CB supports a maximum bus clock frequency of 8 MHz, achievable via its integrated PLL circuit. This frequency is derived from internal RC or external crystal sources, and the CPU executes instructions at this rate. The PLL allows multiplication of lower-frequency crystals (e.g., 1 MHz) to meet the 8 MHz target, enabling precise timing without high-frequency external oscillators.
Does the MC68HC908AP16CB include a hardware watchdog timer?
Yes, the MC68HC908AP16CB includes a Computer Operating Properly (COP) watchdog timer with user-configurable timeout ranging from 0.5 ms to 2 s. It requires periodic software refresh to prevent reset, ensuring system recovery from software hangs. The COP is independent of the main clock source and remains functional in most low-power modes.
Can the MC68HC908AP16CB perform in-system programming of its FLASH memory?
Yes, the MC68HC908AP16CB supports in-system programming (ISP) of its 16 KB FLASH memory using the ROM-resident Monitor (MON) routines. These routines are accessed via SCI interface and allow erasure, programming, and verification without external programming hardware-enabling field firmware updates and factory calibration.
What analog-to-digital converter capabilities does the MC68HC908AP16CB offer?
The MC68HC908AP16CB features an 8-channel, 10-bit successive-approximation ADC with programmable sample time and conversion trigger sources (software, TIM, or SCI). It supports single-ended inputs referenced to VDDA/VSSA and delivers ±1 LSB integral nonlinearity, making it suitable for precision temperature, voltage, and current sensing in industrial environments.
Is the MC68HC908AP16CB pin-compatible with other members of the AP family?
Yes, the MC68HC908AP16CB shares identical pinout and package (SOIC-28) with MC68HC908AP8, MC68HC908AP32, and MC68HC908AP64. This enables hardware reuse across variants-designers can scale FLASH size (8–64 KB) and RAM (128–2 KB) without modifying PCB layout, simplifying product family development and inventory management.
MC68HC908AP16CB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 42-SDIP (0.600", 15.24mm)
- Series:
- HC08
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- HC08
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- I2C, IRSCI, SCI, SPI
- Peripherals:
- LED, LVD, POR, PWM
- Number of I/O:
- 32
- Program Memory Size:
- 16KB (16K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 1K x 8
- Voltage - Supply (Vcc/Vdd):
- 2.7V ~ 5.5V
- Data Converters:
- A/D 8x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
MC68HC908AP16CB FAQ
1.How can I place an order for MC68HC908AP16CB through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC908AP16CB 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 MC68HC908AP16CB reliable?
The price and inventory of MC68HC908AP16CB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC908AP16CB is usually 5 days.
3.What payment methods are accepted for MC68HC908AP16CB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68HC908AP16CB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68HC908AP16CB?
MC68HC908AP16CB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68HC908AP16CB 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 MC68HC908AP16CB?
For technical support, including MC68HC908AP16CB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC908AP16CB requirements.
6.How does Aetrix verify that MC68HC908AP16CB is sourced from the original manufacturer or authorized distributors?
All MC68HC908AP16CB 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 MC68HC908AP16CB meets industry standards.
7.What is the process for return or replacement of MC68HC908AP16CB?
All MC68HC908AP16CB units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC908AP16CB, 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 MC68HC908AP16CB part is unused and in its original packaging.
Return procedure for MC68HC908AP16CB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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