MC9RS08KA2CDB - 8-Bit RS08 MCU, 2KB Flash, 6-DFN | NXP
MPN: MC9RS08KA2CDB ✗ Cuối đờiMC9RS08KA2CDB Tóm tắt
Background: An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (Flash/ROM), data memory (RAM), and peripherals on one silicon die. The RS08 core is a streamlined variant of NXP's (formerly Freescale's) S08 architecture, designed for ultra-low-cost, ultra-low-pin-count applications where HCS08 performance is not required. The RS08 belongs to the 8-bit MCU product class within the broader microcontroller hierarchy (8-bit MCU -> microcontroller -> embedded computing -> semiconductor). It is intended for cost-sensitive, space-constrained designs that still need deterministic, low-power embedded control.
Key specifications: the MC9RS08KA2CDB operates from a 1.8 V to 5.5 V supply (typical operating points 2.5 V/3.3 V/5 V), includes 2KB (2K x 8) of Flash, 63 x 8 RAM, and 4 GPIO. The internal analog comparator (ACMP) listed on some distributor variants is the key analog peripheral in this family, enabling simple threshold detection without an external op-amp.
In design, the RS08 core uses a simplified S08 instruction set plus high-performance LDA, STA, and CLR instructions, allowing efficient C and assembly code generation on a tiny Flash budget. The 6-pin DFN-EP footprint with exposed pad gives a low thermal-resistance path and minimal PCB area, suited to coin-cell or battery-powered sensor nodes and appliance user-interface replacement.
Typical applications: low-end consumer appliances, replacement of discrete logic + analog timer ICs, AC/DC wall-cube controller interfaces, simple LED drivers, battery chargers, and remote controls. The combination of small package, integrated LVD/POR, and ACMP lets one chip replace multiple discrete components.
Design consideration: because only 4 I/O pins are available, designers must budget pin functions carefully — for example, one pin may be shared between ADC input, ACMP input, and external interrupt. Always connect the EP (exposed pad / pin 6 in some outlines) to the ground plane for thermal and electrical performance.
This page synthesizes datasheet specifications, current distributor pricing, drop-in same-family alternatives, and PCB-level design notes compiled from manufacturer documentation and aftermarket listings — material not consolidated in any single OEM source.
Bộ thay thế dễ dàng lắp đặt cho MC9RS08KA2CDB — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với MC9RS08KA2CDB (cùng hình factor và footprint) — khác nhau ở Package, Program Memory Size, RAM Size, Mounting Type, Core Processor.
MC9RS08KA1CDBR
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →MC9RS08KB4CWJ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC9RS08KB8CWJ574
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC9RS08KA2CDB
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC9RS08KA2CDB Tỷ lệ tối đa & tính chất điện
| Core Processor | RS08 |
| Core Size | 8-bit |
| Maximum CPU Frequency | 20 MHz (10 MHz bus, per DigiKey) |
| Program Memory Size | 2 KB (2K x 8) Flash |
| RAM Size | 63 x 8 (63 bytes) |
| EEPROM Size | None |
| Number of I/O Pins | 4 GPIO |
| Supply Voltage (Vcc/Vdd) | 1.8 V to 5.5 V |
| Hộp / Vỏ | 6-DFN-EP (3 x 3 mm) |
| Kiểu lắp đặt | Surface Mount |
| Peripherals | LVD, POR, WDT, ACMP |
| Connectivity | None (no UART, SPI, or I2C on this device) |
| Instruction Set | Simplified S08 + LDA/STA/CLR extensions |
| Trạng thái RoHS | Compliant (per distributor listing) |
Cấu hình chân MC9RS08KA2CDB
| Chân 1 | VDD — Power supply input |
| Chân 2 | VSS — Ground reference |
| Chân 3 | RESET — Reset input (active low) |
| Chân 4 | GPIO / ACMP — Multifunction GPIO with analog comparator input |
| Chân 5 | GPIO — General-purpose input/output |
| Chân 6 | EP — Exposed pad (must be soldered to ground plane for thermal dissipation) |
Ứng dụng tiêu biểu
MC9RS08KA2CDB phù hợp cho 7 Áp dụngs: Low-End Appliance User-Interface Replacement, Battery-Powered Remote Control, Simple LED Driver / Blinker, AC/DC Wall-Cube Load Interface, Battery Charger State Controller, Sensor Threshold Detector, Automotive Aftermarket Replacement.
Low-End Appliance User-Interface Replacement
The MC9RS08KA2CDB replaces discrete logic and mechanical timers in low-cost white goods with a single 6-pin IC. Its integrated ACMP can read a potentiometer or thermistor divider and drive an LED or relay via one GPIO. Operating from 1.8 V to 5.5 V allows direct connection to AC/DC wall-cube outputs or battery packs. The 6-DFN-EP footprint drops onto boards designed for the part's pinout, and 2 KB of Flash holds a simple state-machine plus UI lookup tables without external memory. Compared to a 555-timer + discrete flip-flop implementation, the KA2CDB shrinks the BOM, removes trim pots, and adds software-driven timing, which speeds variant changes on the production line.
Được đề xuất
Battery-Powered Remote Control
In handheld IR / RF remote controls, the MC9RS08KA2CDB runs from a coin cell or 2 x AAA cells across the 1.8 V to 5.5 V supply range and consumes only what the integrated peripherals demand. The internal ACMP can wake the part on a button-press event, with the WDT handling button-scan timing. The 6-pin DFN-EP fits behind a key cap on a single-sided PCB, freeing layout space for the battery clip. With 63 bytes of RAM and 2 KB Flash, designers can implement debounce, repeat codes, and sleep routines easily. The RS08 core's deterministic interrupt latency makes it ideal for tight button-to-IR protocols that must meet consumer-electronics timing tolerances.
Được đề xuất
Simple LED Driver / Blinker
The MC9RS08KA2CDB drives multi-mode LED blinkers, safety strobes, or fairy-light controllers using GPIO bit-banging and the ACMP for simple battery-voltage sensing. Two GPIO can be reserved for LEDs (one for status, one for the load) while the remaining two drive the ACMP inputs and a user push-button. Power comes straight from the LED battery, with the on-chip LVD cutting output when the cell drops below threshold to prevent deep discharge. The wide 1.8 V to 5.5 V supply lets the same code run on 1S Li-ion, 2 x AA, or 3 V coin cells. The 6-DFN-EP package is small enough to fit a standard CR2032 holder envelope and the device's ultra-low-power profile extends battery life.
Được đề xuất
AC/DC Wall-Cube Load Interface
On the secondary side of an isolated AC/DC wall cube, the MC9RS08KA2CDB provides a smart interface between the low-voltage rail and the device being powered (a handset, IoT node, or appliance). Its 5 V-tolerant inputs connect directly to the rectified secondary, and the integrated LVD signals plug-presence to the host. One GPIO can be assigned to USB-DM-style signaling or to a simple opto-isolated feedback path. The EP-pad DFN package handles the small thermal load of the always-listening logic. Designers appreciate the part's small BOM footprint versus a discrete solution and the regulatory simplicity of using an MCU that fits within an isolation barrier.
Được đề xuất
Battery Charger State Controller
A MC9RS08KA2CDB can supervise a simple linear or switch-mode charger for single-cell Li-ion / LiFePO4 packs, using the ACMP to compare battery voltage against an internal bandgap reference and a GPIO to drive a power-FET gate. The on-chip POR guarantees a defined state at first plug-in, and the LVD disables charging below a safe minimum. The 2 KB Flash holds the CC/CV profile lookup tables and indicator-LED logic without external EEPROM. Operating from 1.8 V to 5.5 V covers the entire Li-ion charge-discharge window, while the 6-pin DFN-EP fits inside a USB-C charger housing. Designers should follow NXP's EMC guidelines in the RS08KA datasheet when driving high-current switching FETs from the same board.
Được đề xuất
Sensor Threshold Detector
In a sensor-threshold detector, the MC9RS08KA2CDB uses its analog comparator (ACMP) to compare an external sensor (thermistor, photocell, or hall sensor) against a fixed reference. The 8-bit RS08 core then drives an alert GPIO and a status LED without an external op-amp or window comparator. The integrated WDT protects against sensor-lockup, while LVD/POR handle brown-out events on long wire runs. With only 4 GPIO, the device is suited to one-sensor-one-output designs, but multiple KA2CDBs can be chained on a single RS-485-like link. The 6-DFN-EP 3x3 mm footprint allows placement inside small enclosures, and the wide supply tolerance simplifies field wiring across 3.3 V to 5 V systems.
Được đề xuất
Automotive Aftermarket Replacement
The MC9RS08KA2CDB is not AEC-Q100 qualified, so automotive designs must use it only in non-safety, aftermarket retrofit roles where the operating environment is benign. The 6-pin DFN-EP part works well inside a sealed plastic enclosure for climate-control trim, seat-position memory, or interior lighting. Its 1.8 V to 5.5 V supply range matches typical 5 V regulated body-electronics rails, and the integrated LVD/POR guard against transient automotive supply dips. With 2 KB Flash and 63 bytes RAM, the device is overkill for many trim functions but unbeatable for BOM cost. Production automotive designs should move to an AEC-Q100 Kinetis E or S12Z part on the same PCB footprint only after a full qualification program.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MC9RS08KA2CDB — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | MC9RS08KA1CDBR | MC9RS08KB4CWJ | MC9RS08KB8CWJ574 |
|---|---|---|---|---|
| Package | 6-DFN-EP (3x3 mm) | 6-DFN-EP (3x3 mm) - same | 6-DFN-EP (3x3 mm) - same | 6-DFN-EP (3x3 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core | RS08 8-bit | RS08 8-bit | RS08 8-bit | RS08 8-bit |
| Program Memory | 2 KB Flash | 1 KB Flash | 4 KB Flash | 8 KB Flash |
| CPU Speed | 20 MHz (10 MHz bus per DigiKey) | 20 MHz | 20 MHz | 20 MHz |
| Supply Voltage | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| Peripherals | LVD, POR, WDT, ACMP | LVD, POR, WDT, ACMP | LVD, POR, WDT, ACMP | LVD, POR, WDT, ACMP |
Bảo phân biệt quan trọng
- Smallest Flash configuration in RS08KA family (vsMC9RS08KB4CWJ)
- Same RS08 core across alternatives (vsMC9RS08KA1CDBR)
- Limited GPIO budget (4 GPIOs only) (vsMC9S08AW16AE0CLDR)
Ghi chú thiết kế
Place a 100 nF X7R decoupling capacitor within 2 mm of the VDD pin (pad 1) and a 10 uF bulk capacitor on the same supply rail, since the 6-DFN-EP package has very short internal bond wires that respond to high-frequency supply transients. The integrated LVD triggers a clean reset when VDD drops below the configured threshold, which protects flash integrity in brown-out events typical of AC/DC wall-cube designs.
Solder the exposed pad (EP, pin 6) to a continuous ground pour on at least 1 oz copper. Without this, theta_JA rises dramatically on the small 3 mm x 3 mm outline, and any sustained GPIO drive current derates quickly. If the application drives a relay or LED string from a GPIO, distribute the load across multiple GPIOs and add a small SOT-23 FET for high-current loads.
Because the device exposes only 4 GPIO plus VDD/VSS/RESET/EP, plan pin functions carefully during schematic capture. A common pattern is: GPIO1 = ACMP input, GPIO2 = button wake-up, GPIO3 = LED indicator, GPIO4 = communications bit-bang or analog output. Keep high-speed signals away from the EP pad ground return path on layer 2 to maintain signal integrity.
Do not assume this part is a 6-pin equivalent of an S08/HCS08 device; the RS08 ISA is a strict subset, and several S08 peripherals (KBI, SCI, ADC) are absent on KA2. After assembly, verify the on-chip oscillator tolerance at the application's voltage and temperature — internal oscillators in this family typically have +/- 2 % to +/- 5 % drift, which is fine for debounce but inadequate for UART timing.
Thông tin tuân thủ
RoHS compliance per distributor product pages; halogen-free and REACH status not explicitly confirmed in the verified data. AEC-Q100 is not qualified - this device is for non-automotive / aftermarket use only.
