C8051F315 - 25MHz 8-Bit Mixed-Signal MCU | Silicon Labs
MPN： C8051F315 ✓ 啟用中C8051F315 概覽
An 8-bit microcontroller is a compact embedded-control device whose processor, memory, peripherals, and I/O are integrated on one semiconductor die. The C8051F315 belongs to the C8051F31x family, which combines the established 8051 instruction set with mixed-signal processing and factory-programmable Flash. It is suited to applications where local control, analog measurement, and modest communication requirements matter more than the computational capacity of a 32-bit MCU.
The device's 25 MHz operating frequency provides a 25 MIPS-class execution rate according to the published product information. Its 8 kB Flash supports in-system programming, while 1.25 kB of RAM provides working memory for control logic, buffers, and stack operations. Twenty-five I/O pins allow external sensors, actuators, displays, and digital interfaces to be connected without a separate input/output expander.
The C8051F315 integrates an analog-to-digital converter and two comparators directly into the MCU. These resources reduce external component count in control systems that compare analog thresholds or acquire sensor data. Four 16-bit timers provide greater timing resolution than basic 8-bit counters, making the device suitable for periodic sampling, pulse measurement, PWM generation, and motor or actuator timing functions.
Typical uses include industrial sensor controllers, compact motor-control modules, building automation nodes, power-supply monitoring, LED and lighting controllers, and small embedded instruments. The 5 x 5 mm QFN package supports space-constrained designs, but its exposed-pad construction requires careful PCB layout and adequate thermal copper to dissipate heat reliably.
Designers should verify the complete pin multiplex, exposed-pad connection, voltage limits, and peripheral assignments in the manufacturer datasheet before layout. The compact land pattern also demands short analog and digital return paths, local decoupling, and controlled high-impedance analog routing to preserve measurement accuracy.
This product page consolidates manufacturer specifications, distributor listings, package information, application guidance, and verified design considerations. It also distinguishes confirmed C8051F31x family data from unknown electrical details rather than estimating values that require datasheet confirmation.
直接替換替代品，適用於 C8051F315 — 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。
此系列的變體
與下列產品可直接替換的同系列型號： C8051F315 （相同外形與佔位） — 差異在於 Package, Flash Memory, Microcontroller Type, Program Memory Type.
此產品無可直接替換的替代品。
申請替代品C8051F315 最大額定值與電氣特性
| Microcontroller Type | 8-bit mixed-signal microcontroller |
| Processor Core | 8051 core |
| 最大時脈頻率 | 25 MHz |
| Maximum Instruction Rate | 25 MIPS |
| Flash Memory | 8 kB (8K x 8) |
| RAM | 1.25 kB |
| Number of I/O Pins | 25 |
| ADC | On-chip ADC |
| Comparators | 2 |
| Timers | 4 x 16-bit |
| Communication Interfaces | On-chip additional communication interfaces |
| Power-On Reset | On-chip |
| VDD Monitor | On-chip |
| Watchdog Timer | On-chip |
| 封裝 | 28-QFN (5 x 5 mm), exposed pad |
| 安裝類型 | Surface mount |
C8051F315 28-qfn (5 x 5 mm), exposed pad 腳位配置指南
C8051F315（28-qfn (5 x 5 mm), exposed pad 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： C8051F315.
請參閱 資料表 以查看完整腳位配置。
典型應用
C8051F315 適用於 6 應用s: Industrial Sensor Controller, Compact Motor-Control Module, Building Automation Node, LED Lighting Controller, Power-Supply Monitor, Embedded Measurement Instrument.
Industrial Sensor Controller
The C8051F315 fits compact sensor-conditioning and supervisory nodes because it combines a 25 MHz 8051 core with 8 kB Flash, 1.25 kB RAM, an on-chip ADC, two comparators, and 25 I/O pins. The MCU can sample analog inputs, evaluate thresholds locally, and update actuators without a separate processor or analog interface IC. Its four 16-bit timers also support periodic acquisition and timed control functions. The trade-off is limited memory: 8 kB of Flash and 1.25 kB of RAM require disciplined firmware sizing, especially when adding fieldbus protocols or local data logging.
Compact Motor-Control Module
The C8051F315 is appropriate for small motor or actuator-control modules where four 16-bit timers can generate precise timing references and the 25 available I/O pins can connect sensors, switches, and drive-control signals. Its 25 MIPS-class execution capability provides enough control bandwidth for straightforward closed-loop routines, while the ADC and comparators can monitor position or current-related analog signals. Designers must verify the motor's electrical requirements and external driver architecture because no integrated bridge output is confirmed in the supplied data.
Building Automation Node
A small building-automation endpoint can use the C8051F315 to manage mixed digital and analog inputs at 25 MHz while remaining within a compact 5 x 5 mm footprint. The 25 I/O pins support keys, relays, status indicators, and digital sensors, while the ADC and two comparators can handle environmental or occupancy measurements. Its 1.25 kB RAM is adequate for modest state handling, but firmware must remain below the 8 kB Flash limit. A communications interface should be selected only after confirming the required protocol and peripheral mapping in the manufacturer documentation.
LED Lighting Controller
The C8051F315 can act as a local LED or illumination controller because its four 16-bit timers support PWM-style timing and its 25 I/O pins leave ample connections for drivers, switches, and status feedback. The 25 MHz core can execute dimming schedules and input processing while the ADC provides a path for analog dimming or current-feedback measurement. Because the verified data does not confirm a dedicated PWM peripheral or LED-driving outputs, engineers must examine the pin multiplex and use external transistor or LED-driver circuitry when required.
Power-Supply Monitor
The C8051F315 is suitable for a compact power-supply supervisory circuit when the system needs local voltage measurement, threshold comparison, fault reporting, and communication. The on-chip ADC, two comparators, VDD monitor, watchdog timer, and power-on reset provide a useful foundation for a supervisory controller. It can monitor operating conditions and trigger a remote fault signal through available I/O. The application must still comply with the C8051F315's confirmed operating-voltage range, which is not specified in the supplied excerpts and must be checked before implementation.
Embedded Measurement Instrument
For a compact instrument or low-channel measurement product, the C8051F315 provides a 25 MHz control core, an ADC, two comparators, four 16-bit timers, and 25 I/O lines within a small 28-QFN package. These resources suit threshold detection, periodic sampling, elapsed-time measurement, and local control of a display or data interface. Its limited 1.25 kB RAM and 8 kB Flash make it more appropriate for targeted measurements than complex waveform analysis or large data buffers. Analog grounding and exposed-pad thermal management remain critical design tasks.
工程參考資料，適用於 C8051F315 — 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 | 28-QFN (5 x 5 mm), exposed pad |
| Brand | Silicon Labs |
| Microcontroller Type | 8-bit mixed-signal microcontroller |
| Processor Core | 8051 core |
| Maximum Clock Frequency | 25 MHz |
| Maximum Instruction Rate | 25 MIPS |
| Flash Memory | 8 kB (8K x 8) |
| RAM | 1.25 kB |
| Number of I/O Pins | 25 |
| Analog Resources | 1 ADC and 2 comparators |
主要差異化特點
- Combines digital control and mixed-signal resources (對比Basic 8-bit microcontrollers without integrated analog conversion)
- Provides four dedicated 16-bit timing resources (對比8-bit microcontrollers limited to basic counter widths)
- Balances control performance with compact integration (對比Larger multi-pin 8-bit MCU packages)
設計說明
Use the manufacturer's 28-QFN land pattern and thermal-via recommendations rather than generating the footprint from the 5 x 5 mm body dimensions alone. The exposed pad is a critical thermal and electrical feature. Place input and output decoupling capacitors close to their associated supply pins, keep the ground plane continuous under the device, and route analog inputs away from high-current switching nodes.
Connect the exposed pad to the recommended ground or thermal construction shown in the manufacturer package documentation and provide enough copper area and vias to dissipate internal heat. Before calculating junction temperature, obtain the device-specific core, I/O, and analog-peripheral current limits. The supplied web data confirms the exposed-pad package but does not provide thermal resistance or maximum power values.
Keep analog sensor traces short, guarded where appropriate, and isolated from digital return currents and switching-power nodes. The ADC and comparators can share the analog ground domain, but high-current outputs should not force return current through sensitive signal paths. Confirm the selected alternate-function pins and their analog specifications in the manufacturer datasheet before finalizing routing.
Do not assume that every C8051F31x family member is pin-compatible merely because several devices use a 28-QFN package. Verify the complete pinout, multiplexed peripheral assignments, memory size, voltage range, and exposed-pad connection for any proposed substitute. The C8051F315-GM ordering variant may represent the same device family, but suffix-specific qualification and packing requirements must be checked before substitution.
合規資訊
The supplied manufacturer and distributor snippets do not state RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive qualification status. The MCU is not presented as an automotive-qualified AEC-Q100 product by the available evidence.
