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NXP Semiconductors MC9RS08KB8CWJ
- Part No.:
- MC9RS08KB8CWJ
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC9RS08KB8CWJ.pdf
- Description:
- IC MCU 8BIT 8KB FLASH 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,846
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Product details
Overview
MC9RS08KB8CWJ from NXP Semiconductors (formerly Freescale) is an 8-bit RS08 core microcontroller with 8 KB flash, 254-byte RAM, and integrated peripherals including 12-channel 10-bit ADC, analog comparator, TPM timer/PWM, IIC, SCI, and keyboard interrupt module. It operates from 1.8 V to 5.5 V at up to 20 MHz CPU frequency and supports industrial temperature range (–40 °C to +85 °C), targeting low-cost embedded control in sensor interfaces and appliance subsystems.
For engineers reviewing the MC9RS08KB8CWJ datasheet, MC9RS08KB8CWJ pinout, MC9RS08KB8CWJ application, or MC9RS08KB8CWJ equivalent, this page delivers verified package mapping (24-pin QFN, case 1982-01), confirmed pin functions per Figure 2 and Table 1, real-world power consumption data (e.g., 1.15–7.67 µA stop mode), and two validated alternative parts for design continuity.
Technical Context
The MC9RS08KB8CWJ implements a subset of the HC08 instruction set with added BGND instruction and single global interrupt vector. Its internal clock source (ICS) uses a frequency-locked loop (FLL) with precision-trimmed internal reference enabling ±0.2% resolution and ≤2% deviation over voltage/temperature - supporting bus frequencies up to 10 MHz without external crystal.
System protection includes COP reset with dedicated 1 kHz low-power oscillator, low-voltage detection (LVD) with reset/interrupt, illegal opcode/address detection, and flash-block protection. Wakeup from Wait/Stop modes is supported via RTI, KBI, ADC, ACMP, SCI, and LVD events - critical for battery-powered sensing nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | RS08 8-bit CPU with BGND instruction and single global interrupt vector - enables compact code footprint and deterministic interrupt latency. |
| Flash Memory | 8 KB on-chip flash with read/program/erase over full 1.8–5.5 V and –40 °C to +85 °C - supports field firmware updates without voltage derating. |
| RAM | 254-byte SRAM - sufficient for real-time sensor buffering and state-machine variables in ultra-low-cost controllers. |
| ADC | 12-channel, 10-bit SAR ADC with 2.5 µs conversion time, internal bandgap reference, and temperature sensor (1.7 mV/°C) - enables direct thermal monitoring and analog signal acquisition in stop mode. |
| Operating Voltage | 1.8 V to 5.5 V supply range - allows direct interface with 3.3 V logic, 5 V legacy systems, and single-cell LiFePO₄ batteries. |
| Package | 24-pin QFN (case 1982-01), 4×4 mm body, 0.5 mm pitch, exposed pad - provides compact footprint and enhanced thermal performance (θJA = 113 °C/W). |
| Power Modes | Run, Wait (CPU off, clocks active), Stop (CPU + clocks off, regulator in standby) - achieves sub-µA quiescent current for extended battery life. |
Pinout & Package
MC9RS08KB8CWJ is housed in a 24-pin QFN package (case 1982-01) with 4×4 mm body, 0.5 mm pitch, and exposed thermal pad. Pin 1 indicator is marked by a dot; the exposed pad must be soldered to PCB ground for thermal and electrical integrity per EB806 guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PTA0/KBIP0/TPMCH0/ADP0/ACMP+ | Port A bit 0, keyboard interrupt input, TPM channel 0, ADC channel 0, ACMP positive input | Multi-function pin enabling shared use across timing, sensing, and user interface - requires careful peripheral configuration to avoid conflict. |
| PTA1/KBIP1/TPMCH1/ADP1/ACMP– | Port A bit 1, keyboard interrupt input, TPM channel 1, ADC channel 1, ACMP negative input | Supports differential analog comparison and dual-channel PWM generation simultaneously with ADC sampling. |
| PTA4/ACMPO/BKGD/MS | Port A bit 4, ACMP output, background debug, master select | Output-only pin; provides single-wire debug access and comparator result visibility without additional GPIO overhead. |
| PTA5/TCLK/RESET/VPP | Port A bit 5, test clock, reset input, programming voltage | Input-only pin; serves as primary system reset and enables in-circuit flash programming at VPP = 5.0–5.5 V. |
| VDD / VSS | Power supply / Ground | Dual power pins support robust decoupling; VDD must be stabilized within ±50 mV during high-current transitions to prevent LVD false triggers. |
Key Features
| Feature | Design Value |
|---|---|
| Single-wire background debug (BDC) | Enables full in-circuit debugging with one pin (BKGD), reducing test point count and simplifying production programming. |
| Flash security circuitry | Prevents unauthorized read-out of firmware via hardware lock bits - essential for protecting proprietary control algorithms. |
| Configurable drive strength & slew rate | Per-pin output drive (low/high) and edge rate control minimize EMI in noisy industrial environments and reduce signal integrity issues. |
| Hardware-triggered ADC in Stop mode | Allows wake-on-analog-event operation: ADC starts conversion autonomously upon external trigger while MCU remains in sub-µA sleep. |
| Internal 1 kHz low-power COP oscillator | Guarantees watchdog timeout independence from main clock source - ensures fail-safe reset even if system clock fails. |
Applications
| Smart Appliance Control | Industrial Sensor Node |
|---|---|
Use Scenario: Temperature and motor speed regulation in washing machine control boards using potentiometer inputs and triac drive signals. IC Role / Device Role / Timing Role: Primary system controller executing PID loops, managing user interface via KBI, and generating phase-controlled PWM for motor drivers. Use Value: 8 KB flash accommodates multi-stage wash cycles and fault diagnostics; 12-channel ADC reads thermistors, current shunts, and water level sensors concurrently. | Use Scenario: Battery-powered vibration and temperature monitoring on rotating machinery with wireless telemetry. IC Role / Device Role / Timing Role: Low-power data acquisition unit that wakes on threshold-crossing (ACMP/ADC), samples sensors, and signals host MCU via IIC. Use Value: Sub-µA stop current extends 10-year battery life; integrated temperature sensor eliminates external component cost and calibration drift. |
| Consumer Electronics Remote | Building Automation Panel |
Use Scenario: IR remote control with touch-sensitive keypad and LED feedback, requiring low standby power and fast wake response. IC Role / Device Role / Timing Role: Keypad scanner and IR carrier generator using TPM PWM and KBI interrupts. Use Value: Keyboard interrupt module supports up to 8 keys with debouncing in hardware; 20 MHz CPU ensures <100 µs key response time. | Use Scenario: Wall-mounted HVAC control panel with rotary encoder, LCD backlight dimming, and ambient light sensing. IC Role / Device Role / Timing Role: Human interface processor handling encoder quadrature decoding, PWM-dimmed LED backlight, and ambient light ADC readings. Use Value: Dual TPM channels generate independent 100 Hz and 1 kHz PWM outputs; 10-bit ADC resolves 1 lux steps in photodiode circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC9RS08KB12CWJ | 12 KB flash, same 24-pin QFN package, identical peripherals and pinout | Requires larger firmware image; suitable when future feature expansion or bootloader space is needed | Select when >8 KB code space is required; drop-in replacement with no layout change. |
| S9KEAZ128AMLH | Cortex-M0+ core, 128 KB flash, 16 KB RAM, 32-pin LQFP, higher power consumption | Targets more complex control tasks with RTOS support; not pin-compatible | Choose for migration path to ARM ecosystem; requires PCB redesign and firmware re-architecture. |
Compared with MC9RS08KB12CWJ, the MC9RS08KB8CWJ trades 4 KB flash for lower cost and identical footprint - ideal for mature, stable firmware. Versus S9KEAZ128AMLH, it offers proven ultra-low-power operation and simpler toolchain but lacks floating-point and advanced peripherals.
Availability
MC9RS08KB8CWJ is available at Aetrix Electronics and suitable for smart appliance control, industrial sensor nodes, consumer electronics remotes, and building automation panels requiring stable component supply across long product lifecycles.
Supply support for MC9RS08KB8CWJ 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 delivering secure, scalable solutions for automotive, industrial, IoT, and communication infrastructure markets.
The MC9RS08KB8CWJ belongs to the RS08 family - designed specifically for cost-sensitive, ultra-low-power embedded control applications where small code size, minimal external components, and robust operation across wide voltage/temperature ranges are critical.
FAQ
What is the maximum operating frequency of the MC9RS08KB8CWJ CPU core?
The MC9RS08KB8CWJ CPU core operates at up to 20 MHz across its full voltage range (1.8 V to 5.5 V) and temperature range (–40 °C to +85 °C). This frequency is achieved using the internal clock source (ICS) with FLL, which supports bus frequencies up to 10 MHz - sufficient for real-time control loops in appliance and sensor applications without requiring external oscillators.
Does the MC9RS08KB8CWJ support in-system programming via its debug interface?
Yes, the MC9RS08KB8CWJ supports in-system programming using its single-wire background debug (BKGD) interface. Programming requires applying VPP (5.0–5.5 V) to the PTA5/RESET pin while asserting BKGD, enabling flash erase/write operations without removing the device from the PCB - essential for field firmware updates and manufacturing programming.
What are the power consumption characteristics of the MC9RS08KB8CWJ in Stop mode?
In Stop mode, the MC9RS08KB8CWJ draws 1.15 µA typical at 5 V, 25 °C, rising to 7.67 µA maximum at 85 °C. At 1.8 V, minimum current is 0.39 µA typical. These values include the voltage regulator in standby - confirming suitability for multi-year battery operation in wireless sensor nodes where wake events are infrequent.
Can the MC9RS08KB8CWJ ADC operate while the MCU is in Stop mode?
Yes, the MC9RS08KB8CWJ ADC can be triggered and complete conversions while the MCU is in Stop mode. The "ADC adder from stop" parameter specifies additional current draw of 54.77–154.97 µA during conversion, allowing autonomous analog event detection without waking the CPU - enabling efficient wake-on-threshold functionality for battery-powered systems.
Is the MC9RS08KB8CWJ pin-compatible with other members of the RS08KB series?
Yes, the MC9RS08KB8CWJ is pin-compatible with MC9RS08KB12CWJ and MC9RS08KB4CWJ in the 24-pin QFN package (case 1982-01). All share identical pin assignments, electrical characteristics, and peripheral mappings - allowing hardware reuse across variants differentiated only by flash size (12 KB / 8 KB / 4 KB) and RAM (254 B / 126 B).
MC9RS08KB8CWJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Series:
- RS08
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- RS08
- Core Size:
- 8-Bit
- Speed:
- 20MHz
- Connectivity:
- I2C, SPI
- Peripherals:
- LVD, POR, PWM, WDT
- Number of I/O:
- 18
- Program Memory Size:
- 8KB (8K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 254 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:
MC9RS08KB8CWJ FAQ
1.How can I place an order for MC9RS08KB8CWJ through Aetrix?
Please submit a Request for Quotation (RFQ) for MC9RS08KB8CWJ 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 MC9RS08KB8CWJ reliable?
The price and inventory of MC9RS08KB8CWJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC9RS08KB8CWJ is usually 5 days.
3.What payment methods are accepted for MC9RS08KB8CWJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC9RS08KB8CWJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC9RS08KB8CWJ?
MC9RS08KB8CWJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC9RS08KB8CWJ 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 MC9RS08KB8CWJ?
For technical support, including MC9RS08KB8CWJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC9RS08KB8CWJ requirements.
6.How does Aetrix verify that MC9RS08KB8CWJ is sourced from the original manufacturer or authorized distributors?
All MC9RS08KB8CWJ 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 MC9RS08KB8CWJ meets industry standards.
7.What is the process for return or replacement of MC9RS08KB8CWJ?
All MC9RS08KB8CWJ units undergo pre-shipment inspection (PSI). If there is an issue with MC9RS08KB8CWJ, 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 MC9RS08KB8CWJ part is unused and in its original packaging.
Return procedure for MC9RS08KB8CWJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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