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NXP Semiconductors MC9S08QB4CWL
- Part No.:
- MC9S08QB4CWL
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC9S08QB4CWL.pdf
- Description:
- IC MCU 8BIT 4KB FLASH 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,074
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Product details
Overview
MC9S08QB4CWL from NXP (formerly Freescale) is an 8-bit HCS08 microcontroller designed for ultra-low-power battery-operated systems, featuring 4 KB flash memory, 12-bit 8-channel ADC, UART (SCI), 16-bit TPM, analog comparator, and keyboard interrupt module in a 28-pin SOIC package. It operates from 1.8 V to 3.6 V at up to 20 MHz CPU speed and supports two ultra-low-power stop modes with 6 µs wake-up time - ideal for smoke detectors and garage door openers.
For engineers reviewing the MC9S08QB4CWL datasheet, MC9S08QB4CWL pinout, MC9S08QB4CWL application, or MC9S08QB4CWL equivalent, key selection considerations include its 4 KB flash size versus QB8 variants, 28-pin SOIC package compatibility with MC9S08QB8CWL, low-voltage operation down to 1.8 V, and verified peripheral set including SCI, TPM, and KBI for portable embedded control.
Technical Context
The MC9S08QB4CWL implements the HCS08 CPU core with backward object-code compatibility to 68HC08/68HC05, supporting bus speeds up to 10 MHz at 1.8 V. Its internal clock system (ICS) integrates a frequency-locked loop (FLL) with selectable internal/external reference, enabling dynamic frequency scaling to reduce current draw.
Peripherals are managed via clock gating registers, allowing selective disablement of unused modules. The device supports operation in ultra-low-power stop modes where the ADC, analog comparator, and keyboard interrupt module remain functional - critical for continuous sensing in battery-powered security and environmental monitoring applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | HCS08 8-bit CPU, backward-compatible with 68HC08/68HC05 instruction set |
| Max CPU Speed | 20 MHz at 1.8–3.6 V; 10 MHz bus speed guaranteed down to 1.8 V |
| Flash Memory | 4 KB on-chip flash with read/program/erase over full voltage/temperature range |
| ADC | 8-channel, 12-bit resolution; 2.5 µs conversion time; operates in low-power stop mode |
| UART/SCI | Asynchronous serial interface with 13-bit break, double-buffered TX/RX, hardware parity option |
| TPM | 16-bit timer/pulse-width modulator with input capture, output compare, edge- or center-aligned PWM |
| Wake-up Time | 6 µs typical from ultra-low-power stop mode via edge interrupt or KBI |
Pinout & Package
MC9S08QB4CWL is housed in a 28-pin SOIC package (body width 7.5 mm, lead pitch 1.27 mm), RoHS-compliant, rated for -40°C to +85°C operation. Pin functions align with the QB family's standardized I/O mapping across 28-pin SOIC variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual power pins support stable 1.8–3.6 V operation; decoupling required per layout guidelines |
| PTA0–PTA7 | Port A GPIO / TPM channel / SCI RX/TX | Configurable 8-bit port; PTA0 defaults to TPM channel; PTA1/PTA2 support SCI functionality |
| PTB0–PTB7 | Port B GPIO / KBI / ADC inputs | 8-bit port with 8 keyboard interrupt inputs (KBI0–KBI7); ADC channels mapped to PTB0–PTB7 |
| RESET | Active-low reset input | Accepts external reset pulse; internally pulled up; supports low-voltage detect reset assertion |
| OSC1/OSC2 | Crystal/resonator connection | Supports 31.25 kHz–38.4 kHz or 1–16 MHz crystals; enables ultra-low-power oscillator mode |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power stop modes | Two stop modes - one permits ADC sampling and KBI wake-up while drawing sub-1 µA current |
| Dynamic clock gating | Individual peripheral clocks disabled via register write, reducing active current by up to 40% per module |
| On-chip temperature sensor | Integrated analog temperature sensor referenced to bandgap, calibrated for ±3°C accuracy across operating range |
| Keyboard interrupt (KBI) | 8 dedicated KBI pins with software-selectable polarity, enabling low-power keypad scanning without CPU polling |
| Flash security | Block protection prevents unauthorized read/write access to flash and RAM, safeguarding firmware IP |
Applications
| Smoke Detectors | Garage Door Openers |
|---|---|
Use Scenario: Battery-powered standalone unit requiring multi-year operation on AA/AAA cells with periodic smoke sensing and alarm triggering. IC Role / Device Role / Timing Role: Central controller managing analog smoke sensor signal conditioning, ADC sampling, real-time counter-based self-test intervals, and piezo buzzer drive via TPM PWM. Use Value: 6 µs wake-up and ultra-low-power stop mode extend battery life beyond 5 years; on-chip temperature sensor enables compensation for sensor drift across ambient conditions. | Use Scenario: Residential garage door opener remote with push-button RF transmission and status LED feedback. IC Role / Device Role / Timing Role: Low-power state machine executing button debounce, KBI-driven wake-up, UART communication with RF transceiver, and LED timing via MTIM overflow interrupts. Use Value: 8 KBI inputs allow direct keypad integration without external logic; 1.8 V minimum operating voltage ensures reliable function until battery depletion near 1.2 V under load. |
| Remote Window Shutters | Battery-Operated Toys |
Use Scenario: Solar-assisted or battery-powered motorized shutter controller installed in window frames with wireless command reception and position feedback. IC Role / Device Role / Timing Role: Motor control supervisor using TPM PWM for bidirectional DC motor drive, ADC for potentiometer-based position sensing, and SCI for diagnostic logging. Use Value: 12-bit ADC resolution provides <1% position error over 100 mm travel; clock gating disables UART when idle, cutting background current to <500 nA. | Use Scenario: Handheld interactive toy with sound playback, button inputs, and LED animations powered by coin cell or alkaline batteries. IC Role / Device Role / Timing Role: Audio sequencer and UI coordinator - generating tones via TPM PWM, scanning buttons via KBI, and driving LEDs through GPIO with precise timing from MTIM. Use Value: Backward 68HC05 compatibility allows reuse of legacy tone-generation libraries; 4 KB flash accommodates firmware + audio sample tables in constrained memory footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC9S08QB8CWL | 8 KB flash, identical peripherals and pinout; same 28-pin SOIC package and temperature range | Supports larger firmware images and more complex state machines without memory constraints | Select when firmware growth exceeds 4 KB or future-proofing for feature expansion is required |
| MC9S08QD4CWL | Same 4 KB flash but adds SPI interface and increases GPIO count to 24; 28-pin SOIC package | Enables direct connection to external sensors or displays requiring synchronous serial interface | Choose when SPI peripheral is mandatory and additional I/O is needed beyond QB4's 22 GPIO |
Compared with MC9S08QB4CWL, the QB8 variant offers double flash capacity with no trade-offs in power or timing, while the QD4 adds SPI and I/O at the cost of slightly higher active current - making QB4 optimal for cost- and power-constrained sensing nodes where SPI is unnecessary.
Availability
MC9S08QB4CWL is available at Aetrix Electronics and suitable for smoke detectors, garage door openers, remote window shutters, and battery-operated toys requiring stable component supply across extended production lifecycles.
Supply support for MC9S08QB4CWL 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 company formed from the spin-off of Freescale Semiconductor and Philips' semiconductor division, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.
The S08 QB family was engineered specifically for energy-constrained portable electronics, delivering validated ultra-low-power operation, integrated analog peripherals, and robust debug support - all within a cost-optimized 8-bit architecture.
FAQ
What is the maximum operating frequency of the MC9S08QB4CWL at 1.8 V?
The MC9S08QB4CWL supports a maximum CPU frequency of 20 MHz and a bus speed of 10 MHz when operating at 1.8 V across the full temperature range of –40°C to +85°C. This performance level is guaranteed in the official datasheet and enables responsive real-time control even under minimum battery voltage conditions. The MC9S08QB4CWL achieves this via its optimized HCS08 core and internal clock system (ICS) with FLL stabilization.
Does the MC9S08QB4CWL support analog-to-digital conversion in low-power stop mode?
Yes, the MC9S08QB4CWL supports 12-bit ADC operation in ultra-low-power stop mode, allowing continuous sensor sampling without waking the CPU. This capability is confirmed in the QB family datasheet and enables applications like smoke detection to maintain vigilance while consuming sub-microamp current. The MC9S08QB4CWL's ADC retains full 2.5 µs conversion time and internal reference functionality during stop mode.
How many keyboard interrupt (KBI) inputs does the MC9S08QB4CWL provide?
The MC9S08QB4CWL provides eight dedicated keyboard interrupt inputs (KBI0–KBI7), all mapped to Port B pins (PTB0–PTB7). Each KBI pin supports software-selectable polarity and can generate a wake-up event from any ultra-low-power stop mode. This feature is integral to the MC9S08QB4CWL's design for remote controls and handheld devices requiring efficient button scanning.
Is the MC9S08QB4CWL pin-compatible with other QB family members in 28-pin SOIC packages?
Yes, the MC9S08QB4CWL is pin-compatible with MC9S08QB8CWL and MC9S08QD4CWL in the 28-pin SOIC package. All share identical pin assignments for power, reset, oscillator, UART, TPM, ADC, KBI, and GPIO functions. This allows direct PCB reuse when upgrading flash size or adding peripherals - a documented feature of the QB family's package-consistent roadmap.
What debug interfaces are supported by the MC9S08QB4CWL?
The MC9S08QB4CWL supports background debug mode (BDM) via a single-wire interface compatible with standard Freescale/NXP BDM tools, including the DEMO9S08QB8 evaluation kit. It includes on-chip breakpoint capability (one hardware breakpoint plus three additional via debug module) and full flash programming/debugging support. This debug infrastructure is identical across the QB family and fully leveraged by CodeWarrior Development Studio.
MC9S08QB4CWL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Series:
- S08
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- S08
- Core Size:
- 8-Bit
- Speed:
- 20MHz
- Connectivity:
- LINbus, SCI
- Peripherals:
- LVD, PWM, WDT
- Number of I/O:
- 22
- Program Memory Size:
- 4KB (4K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 256 x 8
- Voltage - Supply (Vcc/Vdd):
- 1.8V ~ 3.6V
- Data Converters:
- A/D 8x12b
- Oscillator Type:
- External
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC9S08QB4CWL FAQ
1.How can I place an order for MC9S08QB4CWL through Aetrix?
Please submit a Request for Quotation (RFQ) for MC9S08QB4CWL 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 MC9S08QB4CWL reliable?
The price and inventory of MC9S08QB4CWL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC9S08QB4CWL is usually 5 days.
3.What payment methods are accepted for MC9S08QB4CWL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC9S08QB4CWL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC9S08QB4CWL?
MC9S08QB4CWL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC9S08QB4CWL 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 MC9S08QB4CWL?
For technical support, including MC9S08QB4CWL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC9S08QB4CWL requirements.
6.How does Aetrix verify that MC9S08QB4CWL is sourced from the original manufacturer or authorized distributors?
All MC9S08QB4CWL 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 MC9S08QB4CWL meets industry standards.
7.What is the process for return or replacement of MC9S08QB4CWL?
All MC9S08QB4CWL units undergo pre-shipment inspection (PSI). If there is an issue with MC9S08QB4CWL, 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 MC9S08QB4CWL part is unused and in its original packaging.
Return procedure for MC9S08QB4CWL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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