Silicon Labs C8051F552-IM

Overview

C8051F552-IM from Silicon Laboratories is a mixed-signal, ISP-flash 8051 microcontroller with integrated 12-bit ADC (200 ksps), dual comparators, CAN 2.0 controller, LIN 2.1 controller, and hardware UART/SMBus/SPI - designed for automotive sensor nodes and body-control modules operating from –40 to +125 °C.

For engineers reviewing the C8051F552-IM datasheet, C8051F552-IM pinout, C8051F552-IM application, or C8051F552-IM equivalent, key selection criteria include AEC-Q100 qualification, crystal-free CAN/LIN operation, internal 24 MHz ±0.5% oscillator accuracy, 1.8–5.25 V supply range, and 24-pin QFN packaging with 18 I/O pins.

Technical Context

The C8051F552-IM implements a pipelined CIP-51 8051 core delivering up to 50 MIPS at 50 MHz, with on-chip debug via C2 interface and full-speed non-intrusive in-system programming. Its analog subsystem includes a 12-bit ADC with 32-channel multiplexer, programmable gain, burst mode, and built-in temperature sensor.

Digital peripherals include four 16-bit timers, a 16-bit programmable counter array (PCA) with six capture/compare modules, hardware-enhanced serial interfaces (UART0, SMBus™, enhanced SPI™), and dedicated CAN0 and LIN0 controllers - both operable without external crystal due to the internal 24 MHz oscillator's ±0.5% accuracy.

Key Specifications

Pinout & Package

Package: 24-pin QFN (5 × 5 mm, 0.5 mm pitch), thermally enhanced with exposed thermal pad (EP). Pin count and layout match C8051F550–C8051F557 variants per Rev. 1.4 datasheet Figure 3.4 and Section 4.4.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar mixed-signal automotive MCU applications.

Compared with C8051F550-IM, the C8051F552-IM adds CAN 2.0 capability and doubles flash capacity - critical for OTA-capable gateways. Against S9S12G128F0MLH, it offers lower system cost and smaller footprint but less computational headroom for advanced diagnostics.

Availability

C8051F552-IM is available at Aetrix Electronics and suitable for automotive body electronics, chassis diagnostics, and engine bay sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for C8051F552-IM 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 mixed-signal ICs for timing, MCU, wireless, and sensor applications - with deep expertise in low-power, high-precision analog integration.

The C8051F55x family targets cost-sensitive, AEC-Q100-compliant automotive subsystems requiring integrated analog sensing, LIN/CAN connectivity, and robust in-system programmability - especially where board space and BOM count are constrained.

FAQ

Is the C8051F552-IM pin-compatible with other C8051F55x devices?

Yes - the C8051F552-IM shares the same 24-pin QFN package and pinout as C8051F550–C8051F557 per datasheet Section 3 and Figure 3.4. All variants use identical I/O mapping, power, ground, and debug pin assignments, enabling drop-in replacement within the F55x series when flash size or peripheral enablement permits.

Does the C8051F552-IM require an external crystal for CAN operation?

No - the C8051F552-IM uses its internal 24 MHz oscillator with ±0.5% accuracy to meet CAN 2.0 bit-timing requirements without an external crystal. This is explicitly confirmed in the "Clock Sources" section of the datasheet (Rev. 1.4, p.159), eliminating BOM cost and layout complexity associated with crystal circuits.

What is the maximum ADC sampling rate supported by the C8051F552-IM?

The C8051F552-IM supports up to 200 ksps for its 12-bit ADC (ADC0), as specified in the "Analog Peripherals" section (Rev. 1.4, p.16). This rate applies in single-conversion and burst modes with appropriate clock configuration and VREF stability, enabling high-fidelity acquisition from automotive pressure or temperature sensors.

How does the C8051F552-IM handle power management in automotive stop-start systems?

The C8051F552-IM supports three low-power modes: Idle (19 mA at 50 MHz), Stop (1 µA typical), and Suspend. In Stop Mode, the core and most peripherals halt while retaining RAM and register state - allowing rapid wake-up via CAN, LIN, or external interrupt, making it suitable for battery-sensitive stop-start vehicle architectures.

Is the C8051F552-IM still recommended for new designs?

No - Silicon Labs marks the entire C8051F55x/56x/57x family as "Not Recommended for New Designs" (Rev. 1.4, cover page and p.2). While fully supported and available, new projects should consider Silicon Labs' newer EFM8 or EFR32 families for enhanced performance, security, and longevity - though C8051F552-IM remains viable for legacy refresh and cost-sensitive replacements.