C8051F304 - 25MHz Mixed-Signal 8051 MCU | Silicon Labs
料号： C8051F304 ✓ 量产中C8051F304 概述
A mixed-signal microcontroller is an embedded semiconductor that combines a digital microcontroller core with analog and timing peripherals. Within the product hierarchy, the C8051F304 belongs to the 8051 mixed-signal MCU family, combining a general-purpose microcontroller with an analog-to-digital converter, comparators, timers, and communication interfaces. This integration allows designers to place sensing, control, and digital processing functions on a single IC.
The device operates at 25 MHz and is advertised as delivering 25 MIPS. Its 4 kB Flash memory supports 4K x 8 programmable storage, while its 0.25 kB RAM provides 256 bytes of data memory. The integrated analog subsystem includes an 8-bit ADC capable of 500 ksps, eight external inputs, a comparator, and a built-in temperature sensor. Programmable amplifier gains and selectable references add flexibility for low-level signal acquisition.
Three 16-bit timers provide timing, capture, and event-management resources, while the additional communication interfaces expand the range of connected peripherals that can be supported. The 8051 architecture and Silicon Labs peripheral structure make the C8051F304 appropriate for compact control systems that need more analog measurement capability than a basic general-purpose MCU provides.
Typical uses include industrial sensor nodes, building-control modules, compact motor-control interfaces, temperature-measurement instruments, and low-power monitoring systems. The 11-pin QFN package is particularly useful where PCB area is constrained. In these designs, the ADC and comparator can perform fast local measurements while the timers support precise periodic control and the digital core handles protocol processing and system logic.
Designers should verify the exact package pin assignment, exposed-pad requirements, clock source, and analog-reference arrangement against the manufacturer datasheet before layout. Decoupling should be placed directly beside the supply pins, analog and digital returns should be routed deliberately, and exposed-pad thermal management may be necessary in designs with sustained computational or conversion activity.
This product page combines verified manufacturer and distributor information with application guidance, package constraints, and a conservative alternative analysis. It is intended to help engineers determine whether the C8051F304 provides the required Flash, RAM, ADC, timer, package, and supply capabilities without relying on generic microcontroller specifications.
直接替换替代料： C8051F304 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
C8051F304-GM
✅ 直接替换📋 参考替代料（不在目录中）
C8051F300
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
C8051F301
✅ 直接替换 ⚠️ 规格未核验联系询价
查看数据手册 →C8051F304 最大额定值与电气特性
| Product Type | Mixed-signal 8-bit microcontroller (MCU) |
| Processor Core | 8051 |
| 最大时钟频率 | 25 MHz |
| Instruction Throughput | 25 MIPS |
| Flash Memory | 4 kB (4K x 8) |
| RAM | 0.25 kB (256 bytes) |
| ADC Resolution | 8 bit |
| ADC Maximum Sampling Rate | 500 ksps |
| ADC External Inputs | 8 inputs |
| Comparator | 1 comparator with programmable hysteresis and response time |
| Built-in Temperature Sensor | Yes |
| Timers | 3 x 16-bit timers |
| Programmable Amplifier Gains | Supported; gain and reference details require datasheet verification |
| Reference Voltage Options | External VREF pin or VDD |
| External Conversion Start Input | Yes |
| 封装 | 11-pin QFN, 3 x 3 mm |
| 安装类型 | Surface mount |
| Communication Interfaces | Additional communication interfaces; exact peripheral set requires datasheet verification |
C8051F304 11-pin qfn, 3 x 3 mm 引脚配置指南
C8051F304（11-pin qfn, 3 x 3 mm 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： C8051F304.
请参阅 数据手册 以查看完整引脚配置。
典型应用
C8051F304 适用于 6 应用s: Industrial Sensor Node, Building Control Module, Temperature Monitoring Instrument, Compact Motor-Control Interface, Battery-Powered Monitoring Device, Programmable Threshold Controller.
Industrial Sensor Node
The C8051F304 fits compact industrial sensing nodes because its 25 MHz core performs local control while the 8-bit ADC samples up to eight external inputs at 500 ksps. The 256-byte RAM supports short acquisition and processing buffers, while 4 kB of Flash accommodates a focused control program. Place the device near the sensors to minimize analog trace length, use a stable external or VDD reference as permitted by the design, and isolate analog routing from switching nodes. The 3 x 3 mm QFN saves board area, although thermal verification remains necessary under sustained conversion and processing loads.
推荐
Building Control Module
The C8051F304 is suitable for building-control modules that monitor environmental inputs and coordinate actuator timing. Its eight-input 8-bit ADC can support multiple analog sensing channels, while three 16-bit timers provide the timing base needed for periodic sampling, debounce handling, and motor or valve-control sequences. The 25 MHz execution rate provides useful response margin without requiring a larger processor. Use careful partitioning between analog and digital grounds, place bypass capacitance beside the supply pins, and confirm the comparator threshold and hysteresis settings against the manufacturer datasheet.
推荐
Temperature Monitoring Instrument
The C8051F304 provides the core functions for a compact temperature-monitoring instrument because it combines an 8-bit ADC, a comparator, and a built-in temperature sensor. The ADC can evaluate up to eight external inputs at 500 ksps, enabling fast sampling of probes or auxiliary sensor channels, while the 25 MHz core supports calibration, filtering, display updates, and alarm logic. Its 256-byte RAM limits buffering depth, so streamed measurements should be processed promptly. Component selection, gain, and reference configuration must be checked in the datasheet before defining the measurement accuracy budget.
推荐
Compact Motor-Control Interface
The C8051F304 can serve as the low-level controller in a compact motor-control or actuator interface by combining three 16-bit timers with fast analog conversion. Timers provide the timing resources needed for pulse generation, input capture, and periodic control, while the 500 ksps ADC can monitor current, position, or analog command signals. The 25 MHz core leaves processing headroom for closed-loop logic. Keep switching-node and motor-current traces away from the QFN and analog traces, validate the exposed-pad thermal path, and account for the limited 256-byte RAM when sizing buffers and diagnostic data.
推荐
Battery-Powered Monitoring Device
The C8051F304 is suitable for a small battery-powered monitoring device that periodically acquires analog data and then performs local control or communications. Its 4 kB Flash supports a compact firmware image, and the three 16-bit timers can organize wake intervals, sampling periods, and communication windows. The built-in temperature sensor provides an additional local measurement source. Actual standby-current behavior was not included in the verified data, so battery-life calculations require the manufacturer electrical specifications. Firmware should disable unused peripherals and use low-power modes only after confirming wake-up timing and peripheral behavior.
推荐
Programmable Threshold Controller
The C8051F304 works well in programmable threshold and alarm systems because its comparator supports adjustable hysteresis and response time while the ADC provides a measurement path for more detailed diagnosis. Designers can use the comparator for rapid digital threshold events and the 500 ksps ADC for slower, calibrated measurements, with the 25 MHz core coordinating state transitions and outputs. The 11-pin QFN minimizes board area in embedded control cards. Verify input-voltage limits and routing requirements, maintain clean references, and test threshold behavior across temperature because the supplied data does not quantify comparator offsets.
推荐
工程参考数据： C8051F304 ——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 | C8051F304-GM | C8051F300 | C8051F301 | C8051F302 | C8051F303 |
|---|---|---|---|---|---|---|
| Package | QFN-11 (3x3 mm) | QFN-11 (3x3 mm) | QFN-11 (3x3 mm) | QFN-11 (3x3 mm) | QFN-11 (3x3 mm) | QFN-11 (3x3 mm) |
| Brand | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs |
| Processor Core | 8051 | 8051 | 8051 | 8051 | 8051 | 8051 |
关键差异点
- Compact mixed-signal integration （对比 C8051F300)
- Explicit 11-pin 3 x 3 mm QFN configuration （对比 C8051F304-GS)
- High-speed 8-bit conversion with eight inputs （对比 C8051F303)
- Three dedicated 16-bit timing resources （对比 C8051F302)
设计说明
Treat the 11-pin QFN as a compact RF-sensitive layout. Place input and output bypass capacitors immediately beside their corresponding supply pins, keep the ADC traces short, and route analog inputs away from timer outputs, clock lines, and switching-power nodes. The verified material identifies an external VREF option, so provide a clean reference source if selected. Do not assign exact pin locations without checking the applicable QFN drawing because the supplied excerpts do not include the complete pin table.
Validate the thermal path rather than assuming the small 3 x 3 mm QFN is adequate without copper. The exposed-pad arrangement and maximum dissipation were not included in the verified excerpts, so calculate worst-case self-heating from the actual supply, output, and ADC activity, then apply the manufacturer junction-temperature limits. Use maximum PCB copper permitted by the assembly process and consider a reduced operating rate if continuous conversion or sustained CPU activity causes the calculated junction temperature to approach its limit.
Do not select the C8051F304 solely because its nominal speed, Flash, and RAM meet the headline requirements. The 256-byte RAM materially limits buffering, the 8-bit ADC constrains resolution, and the exact QFN pinout, exposed pad, clock options, supply range, and analog-reference limits must be checked in the family datasheet. When using a same-family alternative, confirm that every physical pin and firmware-visible peripheral remains available; a smaller member may reduce Flash, RAM, timers, or communication resources.
Plan analog and digital return paths deliberately. If the ADC, comparator, or temperature sensor is used, keep their inputs on the quiet side of the board and minimize shared copper that carries switching current. Provide local decoupling at the QFN supply pins and use the exposed pad according to the manufacturer's land-pattern and solder-reflow guidance. Because the verified data does not state whether the pad is electrically tied to a supply or ground, that connection must be confirmed before release to manufacturing.
合规信息
The supplied verified snippets do not explicitly state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is not applicable because the C8051F304 is an industrial mixed-signal microcontroller and no automotive qualification was identified.
