MC9S08PB8MTJ - 20MHz 8-Bit 8KB Flash MCU | NXP
MPN： MC9S08PB8MTJ ✓ 啟用中MC9S08PB8MTJ 概覽
An 8-bit microcontroller is a programmable semiconductor that executes firmware from embedded flash memory and controls sensors, actuators, communications interfaces, and digital logic. The MC9S08PB8MTJ uses the S08 architecture, placing a general-purpose CPU, memory, timers, serial interfaces, and analog peripherals within one device. Its 5 V operating focus makes it suitable for industrial, consumer, appliance, and portable equipment designs that use legacy-compatible 5 V signaling.
Key features include 8 KB flash memory, an integrated 12-bit analog-to-digital converter, an analog comparator, an analog amplifier, I2C communication, and flexible timers. The 20 MHz CPU provides deterministic control for motor, power, and measurement functions, while the analog peripherals reduce the need for external discrete circuitry. NXP describes the S08PB family as scalable and pin-compatible, supporting migration across related S08 products while retaining the same core, intellectual property, and software tools.
The device’s mixed-signal architecture is significant because sensor inputs can be digitized without a separate ADC, threshold decisions can be handled by the comparator, and small analog signals can be conditioned by the amplifier. I2C enables connection to sensors, EEPROMs, display controllers, and other serial peripherals, while the timer resources support periodic measurement, timing, pulse generation, and motor-control functions. The S08 core and established toolchain also reduce firmware migration effort for existing S08 designs.
Typical applications include consumer appliance control, industrial sensing, power-system monitoring, temperature measurement, small motor control, energy metering, and compact embedded control panels. Its 20-pin TSSOP package supports conventional surface-mount assembly, while 8 KB of flash supports compact firmware, state-machine logic, calibration tables, and application-specific communication routines. The integrated analog features are particularly useful where board area and component count are important constraints.
When laying out the circuit, place decoupling capacitance at the supply pins and route analog inputs away from switching nodes and high-current return paths. Confirm the required external crystal, clock, reset, and programming connections against the NXP datasheet before finalizing the PCB. Use the device’s 5 V analog and digital design limits when selecting external sensor and interface components.
This product page combines manufacturer specifications, package information, application guidance, design checks, and replacement guidance in a format designed to help engineers evaluate the MC9S08PB8MTJ before schematic capture, PCB layout, firmware development, and sourcing.
直接替換替代品，適用於 MC9S08PB8MTJ — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此產品無可直接替換的替代品。
申請替代品MC9S08PB8MTJ 最大額定值與電氣特性
| Product Type | 8-bit S08 microcontroller |
| CPU Architecture | 8-bit |
| Maximum CPU Frequency | 20 MHz |
| Flash Program Memory | 8 KB |
| Program Memory Organization | 8K x 8 |
| 供應電壓 | 5 V |
| ADC Resolution | 12-bit |
| Analog Comparator | Integrated |
| Analog Amplifier | Integrated |
| Serial Interface | I2C |
| Timer Support | Flexible timers |
| 工作溫度範圍 | -40 C to +125 C |
| 封裝 | 20-pin TSSOP |
| Terminal Count | 20 |
| Lead Form | Gull wing |
| Package Shape | Rectangular |
| Peak Reflow Temperature | 260 C |
| 生命週期狀態 | Active |
MC9S08PB8MTJ rectangular 腳位配置指南
MC9S08PB8MTJ（rectangular 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： MC9S08PB8MTJ.
請參閱 資料表 以查看完整腳位配置。
典型應用
MC9S08PB8MTJ 適用於 6 應用s: Industrial Sensor Monitoring, Consumer Appliance Control, Power Supply Monitoring, Small Motor and Relay Control, Temperature and Environmental Control, Battery-Powered Portable Device.
Industrial Sensor Monitoring
The MC9S08PB8MTJ fits compact industrial monitoring systems that combine analog measurement with local control and serial reporting. Its 12-bit ADC can digitize sensor outputs, while the comparator supports threshold detection and the integrated amplifier can assist with small-signal conditioning. The 20 MHz 8-bit S08 processor can supervise readings, apply calibration, operate flexible timers, and transmit data over I2C. With 8 KB of flash, firmware can include filtering, alarm logic, diagnostics, and communication routines without requiring a larger memory device.
Consumer Appliance Control
The MC9S08PB8MTJ is appropriate for cost-sensitive appliance controllers that coordinate buttons, displays, sensors, relays, and timing functions. Its integrated 12-bit ADC, comparator, amplifier, I2C, and flexible timers reduce the number of external analog and timing components required in compact products. The 8-bit S08 core executes appliance state machines efficiently, while 8 KB of flash accommodates control logic, operating modes, calibration data, and communication handlers. Its 20-pin TSSOP package also supports compact, automated surface-mount assembly.
Power Supply Monitoring
The MC9S08PB8MTJ can serve as the supervisory controller in a power-supply or battery-management module where analog measurements and deterministic timing are required. The 12-bit ADC can monitor voltage or current signals, the comparator can establish fast threshold events, and the flexible timers can control periodic sampling or switching support functions. At up to 20 MHz, the S08 processor can implement state management and fault handling. External precision references, dividers, isolation, and power-semiconductor drivers remain design-specific requirements.
Small Motor and Relay Control
The MC9S08PB8MTJ is suitable for compact motor and relay-control subsystems that need deterministic timing and mixed analog feedback. Its flexible timers can generate periodic control intervals, measure pulse widths, or support basic commutation sequences, while the ADC and comparator provide position, current, or limit sensing. The 8-bit processor can implement safety timeouts, direction logic, and status reporting. A separate transistor, driver, protection, and flyback network is still required for the load, and its ratings must be matched to the motor or relay.
Temperature and Environmental Control
The MC9S08PB8MTJ can form the core of a compact temperature-control or environmental-condition module. A temperature or humidity sensor can feed the 12-bit ADC, the comparator can detect limit conditions, and I2C can connect local sensors, memory, or a display module. The flexible timer blocks support sampling periods, hysteresis timing, and control updates, while the 8 KB flash budget holds conversion logic, set points, and compensation data. The -40 C to +125 C operating range supports demanding industrial environments when system-level thermal design is also completed.
Battery-Powered Portable Device
The MC9S08PB8MTJ can support battery-powered portable products that need local sensing, low-cost control, and serial sensor connectivity. The integrated 12-bit ADC reduces the need for a separate converter, while the comparator supports low-battery or threshold decisions and the amplifier can assist with sensor conditioning. I2C connects compatible sensors and EEPROMs, and flexible timers manage periodic measurements. The 5 V architecture and 20-pin TSSOP package should be evaluated against the battery voltage, regulator efficiency, quiescent-current requirements, and board-space constraints of the finished product.
工程參考資料，適用於 MC9S08PB8MTJ — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 |
|---|---|
| Package | 20-pin TSSOP |
| Brand | NXP Semiconductors |
| CPU Architecture | 8-bit S08 |
| Maximum CPU Frequency | 20 MHz |
| Flash Program Memory | 8 KB |
| Program Memory Organization | 8K x 8 |
| Supply Architecture | 5 V |
| ADC Resolution | 12-bit |
| Analog Resources | Comparator and amplifier |
| Serial Interface | I2C |
| Operating Temperature Range | -40 C to +125 C |
設計說明
Place the required supply-decoupling capacitor immediately across the device supply and ground pins, and keep the return path short. Route analog inputs away from switching-node copper and high-current motor or relay paths. The 12-bit ADC and integrated analog amplifier make board-level isolation important: use a quiet ground reference where practical, minimize loop area around sensor inputs, and follow the NXP datasheet layout recommendations for the selected package.
Do not infer pin compatibility from the 20-pin TSSOP package alone. Before using another S08 microcontroller, compare every terminal function, power pin, ground pin, clock connection, reset input, programming interface, analog input, timer mapping, and peripheral alternate function. Also verify flash capacity, timing limits, and temperature grade. This is especially important because related S08 families may use different package assignments even when their product names appear similar.
Treat analog inputs as precision signal paths. Keep sensor traces short, avoid running them parallel to high-current switching traces, and provide a low-impedance analog ground return where the application permits it. Stabilize the ADC reference and supply rails while accounting for temperature. When using the comparator for fast threshold decisions, add hysteresis or filtering appropriate to the measured signal so that noise does not cause repeated state transitions.
Validate the 5 V supply tolerance, startup behavior, and current demand against the selected operating mode and clock configuration. The integrated analog resources reduce external circuitry but do not eliminate the need for a stable supply. For battery-powered systems, include a regulator with adequate efficiency and low quiescent current, and ensure brownout behavior is acceptable for the controlled loads. Review absolute maximum and recommended operating conditions in the manufacturer datasheet.
合規資訊
The manufacturer product page identifies MC9S08PB8MTJ as active, but the cited product information does not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status.