C8051F321 - 25MHz 16KB Flash USB 2.0 MCU | Silicon Labs
料号： C8051F321 ✓ 量产中C8051F321 概述
A microcontroller is a programmable system-on-chip that combines a CPU core, memory, analog peripherals, digital I/O, and communication interfaces. The C8051F321 belongs to the 8-bit microcontroller category and specifically to the C8051F32x family, combining the familiar 8051 instruction architecture with enhanced peripherals, Flash ISP programming, USB connectivity, and mixed-signal measurement capability.
Key features include 25 MIPS execution, 16 KB Flash, a 10-bit ADC with up to 200 ksps conversion performance, 21 I/O ports, and a USB 2.0 full-speed function controller with on-chip clock recovery. The integrated USB transceiver removes the need for a separate USB PHY in direct USB applications. A selectable reference can be supplied from an external VREF pin, VDD, or the internal reference, while an external conversion-start input supports triggered measurement systems.
The pipelined 8051 core provides high throughput for its 8-bit class, while the dedicated USB controller handles enumeration and low-speed or full-speed USB traffic in firmware. The 16 KB Flash capacity suits compact control systems, USB interface accessories, data-acquisition nodes, and human-interface-device designs where code size is moderate but peripheral integration and USB connectivity are valuable.
Typical applications include USB-to-serial adapters, HID controllers, industrial data-acquisition modules, programmable instrumentation, USB-connected sensor nodes, and embedded control boards requiring analog measurement alongside digital communications. Designers should verify the exact package variant and exposed-pad requirements against the manufacturer datasheet before layout release, and must confirm USB impedance, decoupling, and firmware-driver requirements.
This page consolidates verified manufacturer and distributor information, package-specific ordering data, and practical selection guidance for engineers evaluating the C8051F321 in embedded USB and mixed-signal designs.
直接替换替代料： C8051F321 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： C8051F321 （相同外形与封装尺寸） ——差异在于 ADC Resolution, Flash Memory, Package, Product Type.
C8051F320
✅ 直接替换 ⚠️ 规格未核验联系询价
查看数据手册 →C8051F322
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
C8051F323
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
C8051F324
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
C8051F325
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
C8051F321 最大额定值与电气特性
| Product Type | 8-bit mixed-signal microcontroller (MCU) |
| 最大时钟频率 | 25 MHz |
| Maximum CPU Throughput | 25 MIPS |
| Core Architecture | Pipelined 8051 core |
| Flash Memory | 16 KB (16K x 8) |
| 工作电源电压 | 2.7 V to 3.6 V |
| ADC Resolution | 10 bits |
| ADC Maximum Sampling Rate | 200 ksps |
| ADC Input Configuration | 13 external single-ended or differential inputs |
| ADC Reference Options | External VREF pin, internal reference, or VDD |
| USB Interface | USB 2.0 function controller with integrated transceiver and on-chip clock recovery |
| Number of I/O Ports | 21 |
| External Conversion Start | External conversion-start input |
| Built-in Temperature Sensor | Available through the ADC reference and measurement peripherals |
| 封装 | 28-MLP QFN (5 x 5 mm) |
| 安装类型 | Surface mount |
| RoHS Compliance | RoHS compliant |
| Lifecycle Stage | Active |
C8051F321 28-mlp qfn (5 x 5 mm) 引脚配置指南
C8051F321（28-mlp qfn (5 x 5 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： C8051F321.
请参阅 数据手册 以查看完整引脚配置。
典型应用
C8051F321 适用于 6 应用s: USB HID Control Peripherals, USB Data-Acquisition Modules, Industrial Sensor Interface Nodes, Programmable Test and Measurement Instruments, USB-to-Serial and Protocol Adapters, Compact Embedded Control Systems.
USB HID Control Peripherals
The C8051F321 is well suited to USB-connected keyboards, control panels, and other human-interface devices because it combines an integrated USB 2.0 transceiver with a 25 MIPS pipelined 8051 core. The on-chip USB function controller reduces the external interface component count, while 16 KB of Flash provides space for enumeration, descriptor, and input/output routines. Designers should use a dedicated USB-capable 8051 firmware configuration, confirm endpoint requirements, and follow the datasheet's transceiver routing and impedance guidance.
推荐
USB Data-Acquisition Modules
A 10-bit ADC capable of 200 ksps, 13 external single-ended or differential inputs, and multiple reference choices make the C8051F321 practical for compact USB measurement modules. The ADC can be triggered through its external conversion-start input, helping synchronize acquisition with an external sensor or test sequence. The 25 MIPS core can manage sampling control and USB transfer, although the 16 KB Flash limit and 2.7 V to 3.6 V operating range must be checked against the application.
推荐
Industrial Sensor Interface Nodes
The C8051F321 can act as a compact sensor-interface node that gathers analog measurements through its 10-bit ADC and forwards data over USB. Differential input support may simplify interface arrangements for sensors with balanced outputs, while selectable VREF options permit reference planning around the analog subsystem. Firmware can use the 25 MIPS pipelined core for acquisition and packet preparation. The design should still include appropriate input protection, filtering, calibration, and decoupling selected from the manufacturer data sheet.
推荐
Programmable Test and Measurement Instruments
Integrated USB and a fast successive-approximation ADC allow the C8051F321 to serve as the control core of compact programmable measurement equipment. It can accept external single-ended or differential signals, use an external or internal reference, and synchronize conversion through the external start input. The 25 MIPS throughput supports responsive control and data handling. Engineers should budget Flash space for calibration tables, USB descriptors, and protocol code, and validate analog accuracy across the intended input range.
推荐
USB-to-Serial and Protocol Adapters
A compact USB adapter can use the C8051F321's integrated USB 2.0 controller as the host-side interface while a UART or other serial peripheral connects to the external protocol. This integration avoids a separate USB transceiver and is useful for configuration bridges, legacy equipment adapters, and service tools. The designer must allocate the appropriate 8051 peripherals, USB endpoints, and firmware buffers, and verify whether 16 KB of Flash is sufficient for the protocol stack and boot logic.
推荐
Compact Embedded Control Systems
The combination of a 25 MHz pipelined 8051 core, 21 I/O ports, 16 KB Flash, and integrated analog conversion supports compact embedded controllers that combine digital outputs with limited measurement functions. A typical implementation could monitor switches or sensors, perform a control action, and expose diagnostics through USB. The C8051F321 is most attractive where firmware is modest, USB is required, and an external MCU ecosystem is already established. Validate pin multiplexing and port availability in the exact package variant before schematic release.
推荐
推荐产品汇总
工程参考数据： C8051F321 ——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 | C8051F320 | C8051F322 | C8051F323 | C8051F324 | C8051F325 |
|---|---|---|---|---|---|---|
| Brand | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs |
| Package | 28-MLP QFN (5 x 5 mm) | 28-MLP QFN (5 x 5 mm) | 28-MLP QFN (5 x 5 mm) | 28-MLP QFN (5 x 5 mm) | 28-MLP QFN (5 x 5 mm) | 28-MLP QFN (5 x 5 mm) |
| CPU Architecture | Pipelined 8051 core | Pipelined 8051 family architecture | Pipelined 8051 family architecture | Pipelined 8051 family architecture | Pipelined 8051 family architecture | Pipelined 8051 family architecture |
| Clock Frequency | 25 MHz | 25 MHz | 25 MHz | 25 MHz | 25 MHz | 25 MHz |
| Supply Voltage | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V |
| ADC Resolution | 10 bits | 10 bits | 10 bits | 10 bits | 10 bits | 10 bits |
| ADC Maximum Sampling Rate | 200 ksps | 200 ksps | 200 ksps | 200 ksps | 200 ksps | 200 ksps |
| USB 2.0 Function Controller | Yes, with integrated transceiver and on-chip clock recovery | C8051F32x family configuration; verify device-specific USB resources | C8051F32x family configuration; verify device-specific USB resources | C8051F32x family configuration; verify device-specific USB resources | C8051F32x family configuration; verify device-specific USB resources | C8051F32x family configuration; verify device-specific USB resources |
关键差异点
- Integrated USB transceiver and clock recovery （对比 C8051F320)
- High-speed mixed-signal conversion capability （对比 C8051F325)
- Deterministic 8-bit control performance （对比 C8051F322)
设计说明
Route the USB D+ and D- pair as a controlled-impedance differential pair on the C8051F321 board, keeping the pair short, continuous, and away from switching nodes and analog inputs. Follow the manufacturer's transceiver and layout guidance in the C8051F320/C8051F321 data sheet for trace geometry, grounding, and component placement. Because the supplied verified data does not include a complete pinout, verify USB pin locations and the exposed-pad connection against the exact C8051F321-GM package drawing before releasing copper.
Decouple each VDD supply domain with the capacitance and placement specified by the manufacturer data sheet, and provide a stable reference for both the MCU and the 10-bit ADC. The C8051F321 operates from 2.7 V to 3.6 V, so analog input excursion, USB transceiver supply behavior, and digital output levels must be evaluated against that range. The ADC reference can be external, internal, or VDD; choose it according to measurement accuracy and noise requirements rather than defaulting blindly.
Do not assume that any same-family C8051F32x device is an automatic MCU replacement. Even when the package and core are similar, Flash size, USB endpoints, UART resources, port multiplexing, analog channels, and firmware configuration can differ. Build a migration matrix against the C8051F320/C8051F321 data sheet, recompile with the correct device definition, and verify boot, USB enumeration, analog calibration, and all peripheral pin assignments before substituting a part.
合规信息
The verified C8051F321 specification listing identifies the device as RoHS compliant. REACH, lead-free, halogen-free, and conflict-minerals declarations were not included in the supplied verified data and are therefore left unknown. AEC-Q100 qualification is not applicable to this general-purpose microcontroller based on the supplied information.
