MC9RS08KB4CSG - 8-bit RS08 MCU, 4KB Flash, 20MHz | NXP
料号： MC9RS08KB4CSG ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.56 | $25.60 |
| 100 | $2.27 | $227.00 |
| 500 | $2.04 | $1,020.00 |
| 1,000 | $1.81 | $1,810.00 |
MC9RS08KB4CSG 概述
An 8-bit microcontroller is a single-chip computer that integrates a CPU, memory (Flash/RAM), and peripherals onto one silicon die. The RS08 core is a reduced-instruction-set variant of the HC08 core, offering a subset of the HC08 instruction set plus a BGND (background debug) instruction. The RS08KB sits within the broader taxonomy of 8-bit MCU -> microcontroller -> embedded processor -> semiconductor device. By keeping competitive low-cost, low-power 8-bit controllers, NXP targets white goods, simple sensors, and battery-operated devices where 32-bit Cortex-M MCUs would be overkill.
Key features of the MC9RS08KB4CSG include 4KB (4K x 8) of program Flash, 126 bytes of RAM, an integrated analog-to-digital converter (ADC), timers, a serial communications interface (SCI), and an inter-integrated circuit (I2C) module. The device also includes an internal clock source, multiple I/O pins, and a low-power stop mode for energy-constrained designs. Its 5V tolerance and rugged I/O make it well suited for industrial and appliance environments.
The RS08KB family eases migration by offering multiple package and flash size options, along with pin compatibility across other 5-volt NXP families and support for the CodeWarrior development toolchain. Compared with more powerful ColdFire or Kinetis ARM Cortex-M parts, the RS08 is intentionally lean: one global interrupt vector, fewer addressing modes, and reduced register file, all of which reduce die cost and code size for simple control loops.
Typical applications for the MC9RS08KB4CSG include home appliances (washing machine user interfaces, microwave control panels), battery chargers, LED drivers, low-end toys, simple sensor signal conditioning, and small consumer electronics that require reliable 5V-tolerant digital control. The 20MHz CPU provides ample headroom for basic motor control loops, PWM generation, and UART-based communication with companion chips.
When designing with this MCU, ensure the supply rail stays within 2.7V to 5.5V and respect absolute-maximum ratings on I/O pins. For applications that outgrow 4KB Flash, the family offers pin-compatible higher-density variants (KB8, KB12) and migration paths to the S08 and Kinetis families with the same peripheral IP and toolchain.
This page combines verified distributor pricing, same-brand drop-in alternatives, and practical design notes not aggregated on the manufacturer product page.
直接替换替代料： MC9RS08KB4CSG ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： MC9RS08KB4CSG （相同外形与封装尺寸） ——差异在于 ADC, Timers.
快速对比工具——选择替代料号进行并排对比：
MC9RS08KB8CSG
✅ 直接替换📋 参考替代料（不在目录中）
MC9RS08KB12CSG
✅ 直接替换📋 参考替代料（不在目录中）
MC9RS08KA4CWGR
✅ 直接替换📋 参考替代料（不在目录中）
MC9RS08KA8CWG
✅ 直接替换✓ 有现货
$1.52 / 个
查看数据手册 →MC9RS08KB4CFK
✅ 直接替换📋 参考替代料（不在目录中）
MC9RS08KB4CSG 最大额定值与电气特性
| Core | RS08 (subset of HC08 instruction set) |
| 数据总线宽度 | 8 bit |
| Program Memory Size | 4 KB (4K x 8) Flash |
| RAM Size | 126 byte |
| Maximum CPU Frequency | 20 MHz |
| Supply Voltage Range | 2.7 V to 5.5 V |
| 工作温度范围 | -40 C to +85 C |
| Number of I/O Pins | 14 (typical for 16-SOIC) |
| Package Type | 16-SOIC (SOT-109 equivalent) |
| 安装方式 | Surface Mount |
| ADC | Yes (integrated, multi-channel) |
| Timers | Yes (integrated) |
| Communication Interfaces | SCI (UART), I2C |
| Interrupt Controller | Single global interrupt vector |
| Low-Power Modes | Stop / Wait modes |
| Internal Clock | Yes (integrated oscillator) |
| Lead-Free / RoHS | Yes (details to follow manufacturer declaration) |
MC9RS08KB4CSG 引脚配置
| 引脚 1 | VDD — Positive supply voltage (2.7V to 5.5V) |
| 引脚 2 | PTA0/TCLK/ADP0 — Port A bit 0; timer clock input; ADC channel 0 |
| 引脚 3 | PTA1/ADP1 — Port A bit 1; ADC channel 1 |
| 引脚 4 | PTA2/ADP2 — Port A bit 2; ADC channel 2 |
| 引脚 5 | PTA3/ADP3 — Port A bit 3; ADC channel 3 |
| 引脚 6 | PTA4/ADP4 — Port A bit 4; ADC channel 4 |
| 引脚 7 | PTA5/ADP5 — Port A bit 5; ADC channel 5 |
| 引脚 8 | PTA6/ADP6 — Port A bit 6; ADC channel 6 |
| 引脚 9 | PTA7/ADP7 — Port A bit 7; ADC channel 7 |
| 引脚 10 | PTB0/SDA — Port B bit 0; I2C SDA |
| 引脚 11 | PTB1/SCL — Port B bit 1; I2C SCL |
| 引脚 12 | PTB2/TXD — Port B bit 2; SCI UART TXD |
| 引脚 13 | PTB3/RXD — Port B bit 3; SCI UART RXD |
| 引脚 14 | PTB4 — Port B bit 4; general-purpose I/O |
| 引脚 15 | PTB5/RESET — Port B bit 5; external reset input (bidirectional) |
| 引脚 16 | VSS — Ground reference |
典型应用
MC9RS08KB4CSG 适用于 6 应用s: Home Appliance User Interface, Battery Charger Controller, Low-End Toy and Hobby Electronics, Simple Sensor Signal Conditioning, LED Driver and Lighting Control, Small Consumer Electronics.
Home Appliance User Interface
The MC9RS08KB4CSG is well suited to drive the user-interface logic of white-goods appliances such as washing machines, microwave ovens, and dishwashers. Its 4KB Flash comfortably holds state-machine code for button debouncing, rotary-encoder reading, 7-segment or LED-matrix displays, and simple buzzer patterns. The 5V-tolerant I/O eliminates level shifters when interfacing with mechanical switches, triac (2N6075A) zero-cross detectors, and legacy LED driver transistors. The RS08 core's 20MHz headroom is sufficient for keypad scanning at 10ms rates and UART communication with a companion motor-control board. Compared with a 32-bit MCU, the KB4 reduces BOM cost while retaining deterministic interrupt latency for power-line-synchronized control.
推荐
Battery Charger Controller
For low-power NiMH or single-cell Li-ion chargers, the MC9RS08KB4CSG provides the ADC channels needed to measure battery voltage and charge current while running a simple CC-CV control loop in firmware. The integrated timers generate PWM for a buck or linear-pass regulator, and the SCI/UART reports charge-state telemetry to a host display. Stop and Wait low-power modes let the MCU draw microamps when the charger is idle on the shelf. The wide 2.7V-5.5V supply range allows direct operation from a USB 5V rail or a 3.3V regulated output without additional level shifting, simplifying the charger BOM.
推荐
Low-End Toy and Hobby Electronics
Toy RC controllers, motorized model accessories, and educational STEM kits benefit from the MC9RS08KB4CSG's low unit cost and modest 4KB Flash footprint, which is enough for PWM motor drive, simple sound playback patterns, and LED animations. The RS08 core's single global interrupt vector is well matched to the event-driven nature of toy firmware, and the 20MHz clock supports smooth servo-update rates. I2C lets the KB4 drive a small OLED or RGB-LED module, while the SCI/UART handles IR or 2.4GHz companion-radio links. The industrial -40C to +85C temperature range survives drops in a child's toy box.
推荐
Simple Sensor Signal Conditioning
Industrial and building-automation sensor nodes that only need to digitize one or two analog channels and forward readings over UART or I2C fit the MC9RS08KB4CSG perfectly. The on-chip ADC with internal voltage reference converts thermocouple-amplified, thermistor-bridge, or 4-20mA-derived voltages to digital counts, and the SCI/UART or I2C peripheral transmits the result to a higher-tier controller. The 5V-tolerant digital I/O can directly drive optocoupler-isolated outputs to industrial field buses. Compared with a full-featured MCU, the KB4 reduces idle current and unit cost while keeping deterministic response time on the slow sensor-update loop.
推荐
LED Driver and Lighting Control
LED strip drivers, under-cabinet lighting, and architectural dimmer controllers use the MC9RS08KB4CSG to generate PWM dimming waveforms, read rotary or capacitive touch inputs, and run smooth fade algorithms. The 20MHz CPU comfortably runs a 16-bit PWM at 9-bit resolution for flicker-free dimming down to 0.1 percent. The RS08KB's stop mode enables deep standby between user interactions, and wake-up via a single GPIO keeps average current low for battery-powered fixtures. The wide supply range allows operation from 12V LED-driver rails through a small linear regulator.
推荐
Small Consumer Electronics
Small consumer products such as electronic thermometers, kitchen scales, remote-control key fobs, and personal-care devices use the MC9RS08KB4CSG as a cost-optimized controller for simple button-driven state machines. The integrated ADC reads sensor elements, the timers drive piezo buzzers and LED indicators, and the SCI/UART offers a debug path for production test. The 16-SOIC package is hand-solderable for prototypes and short-run production, while the CodeWarrior toolchain shortens firmware development for engineers familiar with the HC08 ecosystem.
推荐
推荐产品汇总
工程参考数据： MC9RS08KB4CSG ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MC9RS08KB8CSG | MC9RS08KB12CSG | MC9RS08KA4CWGR | MC9RS08KA8CWG | MC9RS08KB4CFK |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 16-SOIC | 16-SOIC | 16-SOIC | 16-SOIC | 16-SOIC | 16-SOIC |
| Core | RS08 | RS08 | RS08 | RS08 (KA sub-family) | RS08 (KA sub-family) | RS08 |
| Flash Memory | 4 KB | 8 KB | 12 KB | 4 KB | 8 KB | 4 KB |
| Maximum CPU Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Peripheral Set | ADC, SCI/UART, I2C, Timers | ADC, SCI/UART, I2C, Timers (same) | ADC, SCI/UART, I2C, Timers (same) | ADC, SCI/UART, I2C, Timers (KA mix) | ADC, SCI/UART, I2C, Timers (KA mix) | ADC, SCI/UART, I2C, Timers (same) |
关键差异点
- Pin-compatible upward Flash migration path on the same 16-SOIC footprint （对比 MC9RS08KB8CSG)
- Lowest unit cost in the RS08KB 16-SOIC lineup （对比 MC9RS08KB8CSG)
- Wide 2.7V to 5.5V supply range allows single-rail 5V and 3.3V designs （对比 MC9S08SH4MFK)
设计说明
Estimated: at VDD = 5.0V, active current at 20MHz is in the single-digit-mA range per the RS08KB family typical characteristics; in stop mode, current drops to a few microamps. Place a 100nF decoupling capacitor as close as possible to the VDD pin (pin 1) and a bulk 4.7uF to 10uF capacitor on the supply rail to suppress switching noise. The internal voltage regulator does not require an external bypass; respect the absolute maximum of 6V on VDD.
Keep the RESET line (PTB5) short and protect it with the recommended pull-up to VDD. Place the 16-SOIC on a 0.050-inch (1.27mm) pitch land pattern with the standard SOIC footprint; hand-soldering pads should be slightly enlarged to ease rework. Route ADC traces away from PWM or switching nodes, and add a ground pour under the MCU to reduce digital noise coupling into analog measurements.
Do not assume the RS08 background-debug pin is interchangeable across mask sets - always consult the latest datasheet before designing the debug header. When migrating code from HC08 to RS08, remember that the RS08 has a single global interrupt vector, so legacy vectored-interrupt source files need restructuring. The ADC reference defaults to VDD unless the internal reference is enabled in software; calibrate at production temperature for best absolute accuracy.
合规信息
RoHS and REACH compliance inferred from NXP/Freescale product listing for the RS08KB family; halogen-free status not explicitly listed in the provided data and marked unknown.
