MC68HC908SR12CFA - 8MHz 8-Bit HC08 MCU 12KB FLASH 48-LQFP | NXP
N.º da peça: MC68HC908SR12CFA ✗ Fim de vida| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $12.45 | $12,45 |
| 10 | $10.95 | $109,50 |
| 100 | $8.5 | $850,00 |
| 500 | $7.1 | $3.550,00 |
| 1.000 | $6.25 | $6.250,00 |
MC68HC908SR12CFA Visão geral
What is an HC08 microcontroller? The HC08 (also written HCS08) is an 8-bit CISC microcontroller family originally developed by Motorola and now owned by NXP Semiconductors. It belongs to the broader category of microcontrollers -> microprocessors -> microcontrollers -> embedded processors -> semiconductor ICs. The HC08 architecture uses a simple von Neumann bus with on-chip FLASH, RAM, timers, ADCs, and serial peripherals, making it suitable for motor control, SMPS control, and consumer appliances. The MC68HC908SR12 is part of NXP's 'SR' sub-family, distinguished by its high-level analog integration including programmable gain amplifier and on-chip current/temperature sensors for closed-loop control.
Key features include 12KB (12K x 8) FLASH, 512 bytes RAM, 31 I/O pins, an internal oscillator, an integrated 10-bit ADC, programmable amplifier, two on-chip sensors (temperature and current), PWM channels, SMBus/I2C, and PLL-based clock generation. The 48-LQFP package supports surface-mount assembly in compact designs. The HC08 core uses a 16-bit stack pointer, X index register, and 8-bit accumulator with H:X addressing for efficient C code generation. Memory-mapped peripherals and a vectored interrupt controller allow deterministic real-time response.
The MC68HC908SR12CFA is engineered for appliance, motor, and SMPS control subsystems. The programmable gain amplifier combined with the current sensor enables direct shunt-current measurement in switch-mode power supply feedback loops, while the temperature sensor supports on-board thermal monitoring without an external diode. The PLL-equipped clock generator module (CGM) decouples bus frequency from the external crystal, allowing precise bus timing independent of oscillator tolerance. The wide operating voltage range and 8MHz internal clock give the SR12CFA enough headroom for digital control loops running at modest rates.
Typical applications include switched-mode power supply (SMPS) primary/secondary controllers, variable-frequency drives and small motor controllers, white goods and appliance control boards, intelligent battery chargers, and consumer electronics requiring integrated temperature monitoring. The combination of on-chip analog and serial peripherals allows a single IC to replace multi-chip analog + MCU designs, reducing BOM cost in high-volume products.
When designing with this MCU, allocate sufficient decoupling (100nF plus 10uF bulk) on VDD/VSS pairs near the package, and follow NXP's PCB layout guideline for the analog AVdd/AVss rails to preserve ADC accuracy. Code development is supported by NXP/Freescale CodeWarrior and the open-source SDCC toolchain for HC08 targets, with flash programming handled through the standard MON08 or serial bootloader interface.
This page consolidates distributor stock, price breaks, drop-in alternatives, and design notes that go beyond the manufacturer datasheet, including cross-package note about RoHS status flagged by some distributors.
Alternativas drop-in para MC68HC908SR12CFA — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
MC68HC908SR12CFB
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MC68HC908SR12MB
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MC68HC908SR12CFA-ND
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MC68HC908SR12CFAR
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
MC68HC908AP8CFB
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MC68HC908SR12CFA Classificações máximas e características elétricas
| Core Architecture | HC08 (8-bit CISC) |
| Core Size | 8-bit |
| Bus Speed (Max) | 8 MHz |
| Program Memory Size | 12 KB (12K x 8) |
| Program Memory Type | FLASH |
| RAM Size | 512 bytes (512 x 8) |
| Number of I/O Pins | 31 |
| Oscillator Type | Internal |
| Encapsulamento | 48-LQFP (7x7 mm) |
| Tipo de montagem | Surface Mount |
| ADC | 10-bit (on-chip) |
| Programmable Gain Amplifier | Yes (on-chip) |
| On-chip Temperature Sensor | Yes |
| On-chip Current Sensor | Yes |
| Communication Interfaces | SMBus / I2C |
| PWM Channels | Yes |
| PLL (Clock Generator) | Yes (CGM with PLL) |
| Operating Temperature Grade | Industrial |
| Terminal Form | GULL WING |
| Number of Terminals | 48 |
| Package Code (JEDEC) | LFQFP |
| Package Shape | Square |
| Packaging Media | Tray |
| Status RoHS | Non-compliant (per iccomponents-distributor listing) |
Guia de Configuração de Pinos do MC68HC908SR12CFA square
Configuração de pinos para MC68HC908SR12CFA (pacote square). Este CI digital inclui GPIO, interfaces de comunicação (UART, SPI, I2C) e pinos de alimentação. Consulte o datasheet do fabricante para funções alternativas dos pinos e opções de configuração. Essencial para projeto de sistemas embarcados e layout de PCB.
Nenhum dado detalhado de pinagem disponível para MC68HC908SR12CFA.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
MC68HC908SR12CFA é adequado para 6 aplicaçãos: Switched-Mode Power Supply (SMPS) Control, Variable-Frequency Motor Drives, White Goods and Appliance Control Boards, Intelligent Battery Chargers, HVAC and Sensor Interface Boards, Consumer Electronics with Thermal Feedback.
Switched-Mode Power Supply (SMPS) Control
The MC68HC908SR12CFA fits SMPS primary and secondary control loops because of its integrated 10-bit ADC, programmable gain amplifier, on-chip current sensor, and PWM channels. In a typical 100W-300W isolated converter, the part reads primary-side current through the on-chip current sensor, feeds it through the PGA into the ADC, and drives a MOSFET through the PWM at switching frequencies up to 100 kHz while running the HC08 CPU at the full 8MHz bus rate. The on-chip PLL decouples the ADC sample clock from the crystal, so loop sample rate and ADC conversion time can be tuned without external timing parts. Compared to a discrete MCU + analog front end, this integration removes 2-3 ICs and about 15-20 external components, which is the dominant BOM cost lever in high-volume SMPS designs.
Recomendado
Variable-Frequency Motor Drives
The MC68HC908SR12CFA is well matched to small variable-frequency drives and BLDC controllers for fans, pumps, and appliances. Its on-chip temperature sensor enables direct heatsink thermal monitoring without an external diode, while the integrated current sensor plus PGA supports single-shunt or dual-shunt current sensing for FOC or trapezoidal commutation. At 8MHz bus frequency, the HC08 core executes field-weakening and PI current loops at update rates in the 10-20 kHz range, and the PWM module can drive a 3-phase inverter at up to about 25 kHz without overloading the CPU. The 12KB FLASH provides headroom for sensorless startup routines and fault-handling state machines commonly required in appliance motor controllers.
Recomendado
White Goods and Appliance Control Boards
Washing machines, dishwashers, refrigerators, and induction cooktops use the MC68HC908SR12CFA as a single-chip control hub. The part integrates enough analog and serial peripherals to read thermistors, door switches, and water-level sensors via its ADC; drive relays, valves, and pumps via GPIO/PWM; and communicate with a front-panel board over SMBus or I2C. The 31 I/O pins and 12KB FLASH comfortably fit dishwasher and washer firmware including motor control, safety state machines, and user-interface handling. The industrial -40C to +85C temperature grade supports unheated enclosures near motors and heaters.
Recomendado
Intelligent Battery Chargers
Lead-acid and Li-ion chargers benefit from the MC68HC908SR12CFA's on-chip temperature and current sensors: the temperature sensor can monitor the cell-pack thermistor or the heatsink while the current sensor supports high-side shunt monitoring without an external op-amp. The SMBus/I2C port is useful for SMBus smart-battery stacks (per SBS-IF) and for reading a charger EEPROM. At 8MHz the HC08 core can run CC-CV charge state machines at a 1 kHz update rate and still have cycles left for LED status driving via GPIO. The integrated ADC plus PGA reaches the resolution needed for accurate Li-ion CV termination within about +/-20 mV without a 12-bit external ADC.
Recomendado
HVAC and Sensor Interface Boards
The MC68HC908SR12CFA can serve as a sensor-hub MCU in HVAC controllers, thermostats, and indoor-air-quality boards. Its 10-bit ADC plus PGA directly digitizes NTC thermistors, airflow sensors, and gas-sensor analog outputs, while the on-chip temperature sensor provides local compensation. The SMBus/I2C port connects to front-panel displays, CO2 sensors, and humidity ICs. The HC08 core handles control loops for damper and fan control at low CPU load. The 48-LQFP package fits 4-layer control boards common in HVAC assemblies, and the industrial temperature grade handles attic and outdoor-cabinet locations.
Recomendado
Consumer Electronics with Thermal Feedback
Consumer products that need thermal feedback - LCD backlight drivers, set-top boxes, LED lighting hubs, and audio amplifiers - can use the MC68HC908SR12CFA's on-chip temperature sensor to throttle or shut down at overtemperature without an external thermistor. The PWM module drives LEDs or fan speeds with closed-loop control tied to the temperature sensor, and the SMBus port connects to system-management ICs. The 12KB FLASH and 31 I/O give enough room for multi-mode behavior (active, standby, fault) and front-panel button handling in a single chip. This reduces BOM cost by 1-2 dollars versus MCU + external temp sensor + supervisor solutions.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MC68HC908SR12CFA — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | MC68HC908SR12CFB | MC68HC908SR12MB | MC68HC908SR12CFA-ND | MC68HC908SR12CFAR | MC68HC908AP8CFB |
|---|---|---|---|---|---|---|
| Package | 48-LQFP (7x7 mm) | 48-LQFP (7x7 mm) - same | 48-LQFP (7x7 mm) - same | 48-LQFP (7x7 mm) - same | 48-LQFP (7x7 mm) - same | 48-LQFP (7x7 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Program Memory (FLASH) | 12 KB | 12 KB | 12 KB | 12 KB | 12 KB | 8 KB (-33%) |
| RAM Size | 512 bytes | 512 bytes | 512 bytes | 512 bytes | 512 bytes | 256 bytes (-50%) |
| Bus Speed (Max) | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| Number of I/O | 31 | 31 | 31 | 31 | 31 | 30 (-3%) |
| On-chip Temperature Sensor | Yes | Yes | Yes | Yes | Yes | No |
| On-chip Current Sensor | Yes | Yes | Yes | Yes | Yes | No |
| Programmable Gain Amplifier | Yes | Yes | Yes | Yes | Yes | No |
| Oscillator Type | Internal | Internal | Internal | Internal | Internal | Internal |
Principais diferenciais
- Integrated analog front end (PGA + temp + current sensor) (vs MC68HC908AP8CFB)
- 12KB FLASH versus 8KB FLASH (vs MC68HC908AP8CFB)
- Industrial temperature grade -CFA suffix (vs MC68HC908JL8CFAE)
Notas de projeto
Estimated: at VDD=5V and 8MHz active CPU current of about 5-7 mA, the MCU dissipates roughly 25-35 mW. Place a 100nF ceramic decoupling cap within 5 mm of every VDD/VSS pair and a single 10uF bulk cap near the package. The 48-LQFP LFQFP package has multiple VDD pins; tie all to a common power plane and all VSS pins to a common ground plane for clean ADC operation.
The MC68HC908SR12CFA datasheet recommends a separate AVdd/AVss analog supply pair fed through a ferrite bead or filter from the digital VDD/VSS plane for the 10-bit ADC. Keep analog traces short and away from switching PWM/GPIO lines routed under the IC. Add a guard ring around the ADC input pins to reduce digital-coupling noise; this typically improves effective ENOB by 1-2 bits on the on-chip ADC.
Do not assume the MC68HC908SR12CFA is RoHS compliant - per the iccomponents-distributor listing, the legacy 'CFA' suffix is RoHS non-compliant. For RoHS-compliant builds select the 'CFA-ND' or a Pb-free suffix variant explicitly documented as lead-free. Programming voltage and MON08 interface timing must follow the latest errata; some early -CFA silicon had ADC gain-error errata documented in the NXP MC68HC908SR12 datasheet revision history.
Informações de conformidade
RoHS status 'non_compliant' is per the iccomponents-distributor listing (https://www.iccomponents-distributor.com/MC68HC908SR12CFA.htm). AEC-Q100 not applicable - this is an industrial/consumer-grade part, not qualified to automotive. Lead-free status reported 'no' consistent with the RoHS non-compliance note. REACH, halogen-free, and conflict-minerals status were not stated in the provided data and are marked unknown.