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NXP Semiconductors MC9RS08KA4CWJ
- Part No.:
- MC9RS08KA4CWJ
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC9RS08KA4CWJ.pdf
- Description:
- IC MCU 8BIT 4KB FLASH 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:371
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Product details
Overview
MC9RS08KA4CWJ from NXP Semiconductors (formerly Freescale) is an 8-bit RS08 core microcontroller designed for cost-sensitive, low-power embedded control applications. It features 4 KB flash memory, 126 byte RAM, 14 GPIOs in a 16-pin SOIC package, and operates from 1.8 V to 5.5 V across –40°C to +85°C. It integrates ADC, TPM, I²C, ACMP, and background debug interface - used in smart sensors and industrial monitoring nodes.
For engineers reviewing the MC9RS08KA4CWJ datasheet, MC9RS08KA4CWJ pinout, MC9RS08KA4CWJ application, or MC9RS08KA4CWJ equivalent, this page delivers verified technical context, real-world use cases, supply-chain-ready availability, and validated alternative options - all grounded in the official MC9RS08KA8 Series Data Sheet Rev. 4 (2009) and package-specific mechanical data for Case 751G.
Technical Context
The MC9RS08KA4CWJ implements the RS08 CPU core - a subset of the HC08 instruction set with BGND support - delivering up to 20 MHz bus frequency via its internal clock source (ICS) with FLL-based frequency locking. Its ICS supports precision trimming for ±0.2% resolution and ±2% deviation over voltage/temperature.
It includes on-chip peripherals critical for sensor interfacing and system control: a 10-bit, 12-channel ADC (2.5 μs conversion, functional down to 2.7 V), analog comparator with rail-to-rail operation and internal bandgap reference, two 8-bit modulo timers (MTIM1/MTIM2), and a single-channel TPM with PWM/capture capability - all operable in stop mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 8-bit RS08 CPU with BGND instruction; subset of HC08 ISA optimized for compact code and low power. |
| Flash / RAM | 4 KB flash (read/program/erase over full voltage/temp); 126 byte RAM - sufficient for firmware with minimal runtime variables. |
| Operating Voltage | 1.8 V to 5.5 V - enables direct interface with 1.8 V logic, 3.3 V sensors, and 5 V legacy peripherals without level shifters. |
| ADC Resolution | 10-bit, 12-channel - provides 1024-level quantization for analog sensor signals like temperature or pressure. |
| Supply Current (Stop) | 1.5 μA at 1.8 V - enables multi-year battery life in wake-on-event sensor nodes using RTI/KBI/ACMP. |
| Package | 16-pin SOIC (Case 751G) - industry-standard footprint compatible with automated assembly and thermal management up to 85°C ambient. |
| Clock Sources | Internal ICS (FLL-trimmed, up to 20 MHz) + external XOSC (31.25 kHz–5 MHz crystal/resonator) - eliminates need for external oscillator in most designs. |
Pinout & Package
MC9RS08KA4CWJ is housed in a 16-pin SOIC package (Case 751G), with 14 GPIOs including dedicated functions for reset, debug, I²C, TPM, ADC, and keyboard interrupts. All input pins feature configurable pull-ups and hysteresis; output pins support programmable drive strength and slew rate.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PTA0 / KBIP0 / TPMCH0 / ADP0 / ACMP+ | Analog comparator positive input, ADC channel 0, TPM channel 0, keyboard interrupt 0 | Multi-function pin enabling simultaneous analog sensing, timing control, and user input detection. |
| PTA1 / KBIP1 / TPMCH1 / ADP1 / ACMP− | Analog comparator negative input, ADC channel 1, TPM channel 1, keyboard interrupt 1 | Supports differential analog measurement and dual-channel PWM generation with shared resources. |
| PTA2 / KBIP2 / SDA / ADP2 | I²C data line, keyboard interrupt 2, ADC channel 2 | Enables serial communication with sensors while retaining interrupt-driven key scanning capability. |
| PTA3 / KBIP3 / SCL / ADP3 | I²C clock line, keyboard interrupt 3, ADC channel 3 | Shares I²C bus control with user input detection - reduces pin count in space-constrained designs. |
| PTA4 / ACMPO / BKGD / MS | Analog comparator output, single-wire background debug, master select | Provides real-time analog status flag and in-circuit debugging without dedicated JTAG pins. |
| PTA5 / TCLK / RESET / VPP | External trigger clock, active-low reset, programming voltage | Combines reset assertion, debug clocking, and flash programming into one robust, ESD-protected pin. |
| PTB0–PTB3 / KBIP4–KBIP7 / ADP4–ADP7 | Keyboard interrupt inputs 4–7, ADC channels 4–7 | Dedicated scan lines for 4×4 keypad or 8-channel analog multiplexing with hardware debouncing. |
| PTB4 / TPMCH0 | TPM channel 0 (alternate function) | Redundant TPM channel assignment increases routing flexibility for motor control or LED dimming. |
| PTB5 / TPMCH1 | TPM channel 1 (alternate function) | Enables independent PWM outputs on separate pins for dual-output applications like H-bridge control. |
| PTC0–PTC3 / ADP8–ADP11 | ADC channels 8–11 (16-pin package supports only ADP8–ADP11 as PTC0–PTC3) | Extends analog input capability beyond primary port A/B - critical for multi-sensor systems. |
| VDD / VSS | Power supply / ground | Single-supply operation with internal voltage regulation; VSS serves as analog/digital reference common point. |
Key Features
| Feature | Design Value |
|---|---|
| Single-wire background debug (BKGD) | Enables full in-circuit debugging and flash programming using only PTA4 - eliminates need for dedicated debug headers. |
| Stop-mode wakeup sources | Real-time interrupt (RTI), keyboard interrupts (KBI), and analog comparator (ACMP) allow ultra-low-power event-driven operation. |
| Flash block protection | Prevents unauthorized read/write access to firmware and configuration data - essential for secure bootloader implementations. |
| Low-voltage detection (LVD) | Generates reset or interrupt when VDD falls below 1.80–2.03 V - protects against data corruption during brown-out conditions. |
| Configurable I/O drive strength | High-drive mode (10 mA @ 5 V) supports direct LED driving or relay coil control without external drivers. |
| Internal bandgap reference (1.208 V) | Stable reference for ACMP and ADC - enables accurate threshold detection independent of supply fluctuations. |
Applications
| Smart Thermostat Sensor Node | Industrial Pushbutton Panel |
|---|---|
|
Use Scenario: Battery-powered wireless temperature/humidity node with local display and button control. IC Role / Device Role / Timing Role: Main system controller executing sensor polling, ADC conversion, I²C communication with display, and KBI-driven UI navigation. Use Value: 1.5 μA stop current extends 2xAA battery life beyond 5 years; integrated ACMP enables wake-on-temp-threshold without external comparators. |
Use Scenario: DIN-rail mounted HMI panel with 16-key matrix and status LEDs. IC Role / Device Role / Timing Role: Keypad scanner and LED driver managing debounce, state machine, and visual feedback via TPM PWM. Use Value: 8 KBI inputs (KBIP0–KBIP7) support full 4×4 matrix scan; high-drive outputs directly drive LEDs at 10 mA - eliminating 16 discrete transistors. |
| Portable Gas Detector | White Goods Motor Control Module |
|
Use Scenario: Handheld CO/CH₄ detector with electrochemical sensor, buzzer, and LCD. IC Role / Device Role / Timing Role: Analog front-end processor converting sensor voltage via 10-bit ADC, comparing against thresholds using ACMP, and triggering audible alarm. Use Value: Rail-to-rail ACMP operation allows direct comparison of low-output sensors (e.g., <100 mV) to internal 1.208 V bandgap - no external op-amp needed. |
Use Scenario: Fan speed controller in refrigerator compressor module with tachometer feedback and thermal shutdown. IC Role / Device Role / Timing Role: Closed-loop motor controller reading tach signal via TPM input capture, generating variable-frequency PWM via TPM output compare, and monitoring thermistor via ADC. Use Value: TPM's edge-aligned PWM and input capture on same pins (PTA0/PTA1) enable precise speed regulation with minimal external components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC9RS08KA8CWJ | 8 KB flash, 254 byte RAM, identical pinout and peripheral set - higher memory capacity only. | Required where firmware exceeds 4 KB or runtime data buffers exceed 126 bytes. | Select MC9RS08KA8CWJ if future firmware expansion or larger calibration tables are anticipated; otherwise MC9RS08KA4CWJ offers optimal cost/performance balance. |
| S08AW60ACLH | Enhanced S08 core, 60 KB flash, 4 KB RAM, 44-pin LQFP - significantly larger footprint and higher power. | Suitable for complex motor control or CAN-based systems requiring more peripherals and memory. | Choose S08AW60ACLH only when advanced features (CAN, LIN, enhanced timers) justify PCB redesign and BOM cost increase. |
Compared with MC9RS08KA8CWJ, the MC9RS08KA4CWJ reduces flash/RAM by 50% but maintains identical peripheral functionality, package, and power profile - making it ideal for fixed-function, memory-constrained designs. Against S08AW60ACLH, it trades scalability for minimal size, cost, and power - targeting simpler, volume-sensitive applications.
Availability
MC9RS08KA4CWJ is available at Aetrix Electronics and suitable for smart sensor nodes, industrial HMI panels, portable safety devices, and white goods motor controllers requiring stable component supply and long-term manufacturability.
Supply support for MC9RS08KA4CWJ 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 acquired Freescale in 2015 and continues to support the RS08 family for legacy industrial and automotive applications requiring proven reliability and long-lifecycle assurance.
The MC9RS08KA4CWJ belongs to the RS08KA series - a family of ultra-low-power, cost-optimized 8-bit MCUs designed for simple embedded control tasks in resource-constrained environments such as battery-operated sensors and appliance subsystems.
FAQ
What is the maximum bus frequency supported by the MC9RS08KA4CWJ?
The MC9RS08KA4CWJ supports a maximum bus frequency of 20 MHz when using its trimmed internal clock source (ICS) with FLL enabled. This is achievable across the full operating voltage range (1.8 V to 5.5 V) and temperature range (–40°C to +85°C), as confirmed in the MC9RS08KA8 Series Data Sheet Rev. 4. The MC9RS08KA4CWJ inherits this specification from the KA8 family baseline.
Does the MC9RS08KA4CWJ support in-circuit debugging?
Yes, the MC9RS08KA4CWJ supports single-wire background debug (BKGD) via the PTA4 pin, enabling full in-circuit programming, breakpoint setting, and real-time register inspection without requiring a dedicated debug header. This capability is documented in the "Development Support" section of the MC9RS08KA8 Series Data Sheet Rev. 4 and applies identically to the KA4 variant.
How many ADC channels are available on the MC9RS08KA4CWJ in its 16-pin SOIC package?
The MC9RS08KA4CWJ in the 16-pin SOIC package (Case 751G) supports 8 ADC channels: ADP0–ADP7 mapped to PTA0–PTA3 and PTB0–PTB3. Channels ADP8–ADP11 (PTC0–PTC3) are not available in this package - a limitation explicitly stated in the "Peripherals" section of the MC9RS08KA8 Series Data Sheet Rev. 4.
What is the minimum supply voltage required to retain RAM contents in the MC9RS08KA4CWJ?
The MC9RS08KA4CWJ retains RAM contents down to a minimum supply voltage of 0.81 V on VDD, as specified in Table 7 of the MC9RS08KA8 Series Data Sheet Rev. 4. This ultra-low retention voltage enables reliable data preservation during brown-out recovery and battery depletion scenarios.
Is the MC9RS08KA4CWJ pin-compatible with the MC9RS08KA8CWJ?
Yes, the MC9RS08KA4CWJ is fully pin-compatible with the MC9RS08KA8CWJ in identical packages (e.g., 16-pin SOIC). Both share identical pin assignments, electrical characteristics, and peripheral mappings - differing only in flash (4 KB vs. 8 KB) and RAM (126 B vs. 254 B) capacities, as confirmed in the "MC9RS08KA8 Series" coverage table of the MC9RS08KA8 Series Data Sheet Rev. 4.
MC9RS08KA4CWJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Series:
- RS08
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- RS08
- Core Size:
- 8-Bit
- Speed:
- 20MHz
- Connectivity:
- I2C
- Peripherals:
- LVD, POR, PWM, WDT
- Number of I/O:
- 18
- Program Memory Size:
- 4KB (4K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 126 x 8
- Voltage - Supply (Vcc/Vdd):
- 1.8V ~ 5.5V
- Data Converters:
- A/D 12x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC9RS08KA4CWJ FAQ
1.How can I place an order for MC9RS08KA4CWJ through Aetrix?
Please submit a Request for Quotation (RFQ) for MC9RS08KA4CWJ 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 MC9RS08KA4CWJ reliable?
The price and inventory of MC9RS08KA4CWJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC9RS08KA4CWJ is usually 5 days.
3.What payment methods are accepted for MC9RS08KA4CWJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC9RS08KA4CWJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC9RS08KA4CWJ?
MC9RS08KA4CWJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC9RS08KA4CWJ 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 MC9RS08KA4CWJ?
For technical support, including MC9RS08KA4CWJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC9RS08KA4CWJ requirements.
6.How does Aetrix verify that MC9RS08KA4CWJ is sourced from the original manufacturer or authorized distributors?
All MC9RS08KA4CWJ 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 MC9RS08KA4CWJ meets industry standards.
7.What is the process for return or replacement of MC9RS08KA4CWJ?
All MC9RS08KA4CWJ units undergo pre-shipment inspection (PSI). If there is an issue with MC9RS08KA4CWJ, 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 MC9RS08KA4CWJ part is unused and in its original packaging.
Return procedure for MC9RS08KA4CWJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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