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Silicon Labs C8051F556-IMR
- Part No.:
- C8051F556-IMR
- Manufacturer:
- Silicon Labs
- Category:
- Microcontrollers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
C8051F556-IMR.pdf
- Description:
- IC MCU 8BIT 16KB FLASH 24QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
C8051F556-IMR from Silicon Laboratories is an automotive-qualified, mixed-signal ISP Flash MCU featuring a 50 MHz 8051 core, 16 kB Flash, 2304 B RAM, 12-bit ADC (200 ksps), dual comparators, CAN 2.0 and LIN 2.1 controllers, and operation from –40 to +125 °C. It integrates on-chip debug, internal 24 MHz oscillator (±0.5% accuracy), and 18 I/O pins in a 24-pin QFN package for embedded vehicle networking nodes.
For engineers reviewing the C8051F556-IMR datasheet, C8051F556-IMR pinout, C8051F556-IMR application, or C8051F556-IMR equivalent, this page delivers verified technical context, validated pin functions, automotive-grade power and timing specifications, and real-world use cases in CAN/LIN gateway and sensor interface designs - all grounded in Silicon Labs' Rev. 1.4 documentation.
Technical Context
The C8051F556-IMR implements a pipelined CIP-51 8051 core delivering 50 MIPS at 50 MHz with expanded interrupt handling and SFR paging support for peripheral access. Its clock system combines a factory-trimmed 24 MHz internal oscillator (±0.5% for CAN/LIN master timing) with flexible external sources and on-the-fly switching between modes.
Analog subsystem includes a 12-bit SAR ADC with up to 32-channel multiplexing, programmable gain, window detection, and integrated temperature sensor; two low-power comparators support hysteresis, interrupt/reset output, and analog input routing via dedicated multiplexer.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | High-speed pipelined 8051 (CIP-51); executes 70% of instructions in 1–2 clocks - enables deterministic real-time control without external wait states. |
| Flash / RAM | 16 kB ISP Flash (512-byte sectors); 2304 B RAM (256 B IRAM + 2048 B XRAM) - supports field firmware updates and buffered sensor data logging. |
| ADC | 12-bit SAR ADC, 200 ksps max; 32-channel single-ended input; internal VREF or external selection - suitable for multi-sensor analog front-end acquisition. |
| CAN/LIN | CAN 2.0B controller + LIN 2.1 controller (master/slave); both operate without external crystal - reduces BOM count and board space in automotive ECUs. |
| Supply & Temp | 1.8–5.25 V operation; –40 to +125 °C ambient; AEC-Q100 qualified - certified for under-hood and body-control module deployment. |
| Power Modes | Stop mode current ≤1 μA; typical active current 19 mA @ 50 MHz - enables low-duty-cycle wake-on-event architectures in battery-powered nodes. |
| I/O Count | 18 GPIO pins, all 5 V tolerant - simplifies interfacing with legacy 5 V sensors and actuators without level-shifting. |
Pinout & Package
Package: 24-pin QFN (4 × 4 mm, 0.5 mm pitch), RoHS-compliant, moisture-sensitive level 3. Exposed thermal pad enhances thermal dissipation in high-ambient automotive environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Primary supply voltage | 1.8–5.25 V input; powers core, analog, and I/O domains - requires local 100 nF + 10 µF decoupling per Silicon Labs layout guidelines. |
| GND | Ground reference | Dedicated analog/digital ground pin; connects to exposed thermal pad - critical for ADC noise performance and EMI robustness. |
| P0.0–P0.7 | Port 0 bidirectional I/O | 8 GPIOs; configurable as digital/analog inputs or push-pull/OD outputs - supports LIN bus TX/RX and CAN RX when crossbar-assigned. |
| P1.0–P1.7 | Port 1 bidirectional I/O | 8 GPIOs; 5 V tolerant; includes C2CK/C2D debug pins - enables in-system programming and non-intrusive debug without emulator hardware. |
| P2.0–P2.3 | Port 2 bidirectional I/O | 4 GPIOs; supports PCA, UART0, SMBus, SPI0 signals via crossbar - allows flexible peripheral mapping to minimize PCB trace congestion. |
| XTAL1/XTAL2 | External oscillator inputs | Supports crystal, RC, capacitor, or external clock (1- or 2-pin mode) - optional backup when internal 24 MHz oscillator is insufficient for timing-critical applications. |
| REG0IN/REG0OUT | Internal LDO regulator terminals | Enable internal 2.5 V regulator for analog circuitry - improves ADC SNR and comparator stability independent of noisy main VDD rail. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip debug (C2 interface) | Full-speed, non-intrusive in-system debug with breakpoints, register/memory inspection - eliminates need for ICE pods or target sockets during development and validation. |
| Internal 24 MHz oscillator | ±0.5% accuracy over temperature/voltage - meets CAN physical layer timing requirements and LIN master baud rate tolerance without external crystal. |
| Hardware LIN 2.1 controller | Auto-baud detection, sleep/wake protocol support, and checksum generation - enables compliant slave node implementation with zero software overhead on timing-critical frames. |
| Programmable crossbar | Flexible routing of UART0, SMBus, SPI0, PCA, and comparator outputs to selected port pins - decouples peripheral assignment from fixed pinout constraints. |
| Temperature sensor | Integrated calibrated sensor with ±3 °C accuracy - provides real-time die temperature monitoring for thermal management and sensor compensation algorithms. |
Applications
| Automotive Body Control Module | Industrial CAN Sensor Node |
|---|---|
Use Scenario: Centralized control of door locks, lighting, and window motors in modern vehicles. IC Role / Device Role / Timing Role: Main MCU executing LIN slave communication with door modules and CAN gateway functions to central domain controller. Use Value: Single-chip integration of LIN/CAN reduces component count; AEC-Q100 qualification ensures reliability across extended temperature cycles. |
Use Scenario: Remote environmental monitoring using analog sensors (temperature, pressure) with CAN bus telemetry. IC Role / Device Role / Timing Role: Sensor interface MCU acquiring data via 12-bit ADC, processing locally, and transmitting via CAN 2.0B frames. Use Value: 200 ksps ADC sampling and 18 GPIOs enable concurrent multi-sensor readout; stop-mode current ≤1 μA extends battery life in wireless deployments. |
| Engine Bay Diagnostic Interface | Smart Actuator Controller |
Use Scenario: On-vehicle diagnostic tool connecting to OBD-II port and interpreting CAN messages from engine control units. IC Role / Device Role / Timing Role: CAN 2.0B controller with message filtering and timestamping; UART interface to USB-to-serial bridge. Use Value: Internal 24 MHz oscillator eliminates crystal requirement - improves mechanical shock resistance in high-vibration engine bay mounting. |
Use Scenario: Closed-loop control of solenoid valves or stepper motors in HVAC or fluid control systems. IC Role / Device Role / Timing Role: PWM generation via PCA with 16-bit resolution and capture-based feedback timing for position sensing. Use Value: Six PCA capture/compare modules support simultaneous PWM output and encoder input - enables compact, cost-effective actuator drive electronics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar mixed-signal automotive MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| C8051F560-IM | 32-pin QFP/QFN; 32 kB Flash; 33 I/O; same core/peripherals - larger memory and I/O count. | Required for designs needing >18 GPIOs or >16 kB code space; higher pin count increases PCB area and routing complexity. | Select when scaling firmware size or adding additional analog/digital interfaces beyond C8051F556-IMR capacity. |
| EFM8BB52F16G-A-QFP32 | Silicon Labs EFM8 Busy Bee family; 16 kB Flash; 32-pin QFP; enhanced low-power modes and USB interface - newer architecture, no CAN/LIN. | Lacks native CAN/LIN controllers; requires external transceivers and software stacks - increases design effort for automotive network nodes. | Prefer for non-networked, ultra-low-power sensor hubs where USB connectivity or deeper sleep modes outweigh CAN/LIN integration. |
Compared with C8051F556-IMR, C8051F560-IM offers more I/O and Flash in a larger package but shares identical peripheral IP and qualification; EFM8BB52F16G-A-QFP32 trades CAN/LIN integration for modern low-power features and USB, making it unsuitable as a drop-in replacement in vehicle networking roles.
Availability
C8051F556-IMR is available at Aetrix Electronics and suitable for automotive body control modules, industrial CAN sensor nodes, engine bay diagnostic interfaces, and smart actuator controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for C8051F556-IMR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Silicon Laboratories is a fabless semiconductor company specializing in silicon timing, IoT, and mixed-signal solutions, with deep expertise in precision analog, MCU, and wireless technologies.
The C8051F55x family targets cost-sensitive, high-reliability automotive and industrial embedded applications requiring integrated analog peripherals, CAN/LIN networking, and AEC-Q100 compliance - designed to replace discrete analog + microcontroller combinations.
FAQ
What is the operating temperature range for the C8051F556-IMR?
The C8051F556-IMR is rated for –40 to +125 °C ambient operation and is AEC-Q100 qualified, making it suitable for under-hood and body-control applications where thermal stress is significant. This range is validated across all specified electrical characteristics including ADC linearity, oscillator accuracy, and Flash endurance - no derating required within these limits.
Does the C8051F556-IMR require an external crystal for CAN or LIN operation?
No, the C8051F556-IMR does not require an external crystal for CAN or LIN operation. Its internal 24 MHz oscillator is factory-trimmed to ±0.5% accuracy over temperature and voltage, meeting the timing requirements for CAN physical layer compliance and LIN master baud rate generation - eliminating crystal BOM cost and board space.
How many analog input channels does the 12-bit ADC support on the C8051F556-IMR?
The C8051F556-IMR's 12-bit ADC supports up to 32 external single-ended analog inputs via its integrated analog multiplexer. Channel selection is software-configurable, and inputs can be sourced from any GPIO pin assigned as analog input - enabling flexible sensor interface configurations without external MUX hardware.
What debug interface does the C8051F556-IMR use, and what are its capabilities?
The C8051F556-IMR uses the 2-wire C2 debug interface (C2CK and C2D pins) for full-speed, non-intrusive in-system debugging. It supports breakpoints, single-stepping, and real-time inspection/modification of memory and registers - providing emulator-class functionality without external hardware, reducing development tooling cost and complexity.
Is the C8051F556-IMR still recommended for new designs?
No, the C8051F556-IMR is marked "Not Recommended for New Designs" in Silicon Labs' official documentation (Rev. 1.4). While fully functional and supported for existing production, new projects should evaluate newer families like EFM8 or Simplicity Studio-enabled devices - though C8051F556-IMR remains available for legacy continuity and long-lifecycle automotive programs.
C8051F556-IMR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Silicon Labs
- Package/Case:
- 24-WFQFN Exposed Pad
- Series:
- C8051F55x
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- 8051
- Core Size:
- 8-Bit
- Speed:
- 50MHz
- Connectivity:
- SMBus (2-Wire/I2C), LINbus, SPI, UART/USART
- Peripherals:
- POR, PWM, Temp Sensor, WDT
- Number of I/O:
- 18
- Program Memory Size:
- 16KB (16K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 2.25K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.8V ~ 5.25V
- Data Converters:
- A/D 18x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
C8051F556-IMR FAQ
1.How can I place an order for C8051F556-IMR through Aetrix?
Please submit a Request for Quotation (RFQ) for C8051F556-IMR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for C8051F556-IMR reliable?
The price and inventory of C8051F556-IMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for C8051F556-IMR is usually 5 days.
3.What payment methods are accepted for C8051F556-IMR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for C8051F556-IMR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for C8051F556-IMR?
C8051F556-IMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your C8051F556-IMR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for C8051F556-IMR?
For technical support, including C8051F556-IMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your C8051F556-IMR requirements.
6.How does Aetrix verify that C8051F556-IMR is sourced from the original manufacturer or authorized distributors?
All C8051F556-IMR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that C8051F556-IMR meets industry standards.
7.What is the process for return or replacement of C8051F556-IMR?
All C8051F556-IMR units undergo pre-shipment inspection (PSI). If there is an issue with C8051F556-IMR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The C8051F556-IMR part is unused and in its original packaging.
Return procedure for C8051F556-IMR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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