Infineon Technologies C505CALMCAFXQMA1

Overview

C505CALMCAFXQMA1 from Infineon Technologies is an 8-bit single-chip microcontroller in the C500 family, fully compatible with the 8051 architecture and extended with 8 datapointers, 10-bit ADC (8 analog inputs), 1 KB on-chip XRAM, and full CAN 2.0B controller. It operates up to 20 MHz (300 ns instruction cycle), features three 16-bit timers, programmable watchdog, and power-saving modes including software power-down with wake-up via P3.2/INT0 or P4.1/RXDC - deployed in automotive body control modules requiring robust real-time CAN communication and sensor interfacing.

For engineers reviewing the C505CALMCAFXQMA1 datasheet, C505CALMCAFXQMA1 pinout, C505CALMCAFXQMA1 application, or C505CALMCAFXQMA1 equivalent, key selection criteria include CAN 2.0B compliance at 1 MBaud (≥8 MHz system clock), 10-bit A/D resolution across 8 channels, 32 KB on-chip ROM, P-MQFP-44 package compatibility with C501/C511 families, and industrial temperature range (-40 to 85°C).

Technical Context

The C505CALMCAFXQMA1 integrates a full-CAN controller compliant with ISO 11898-1:2003 (CAN 2.0B), supporting 1 MBaud bit rate at ≥8 MHz oscillator frequency and featuring internal prescaling for input clocks >10 MHz. Its CAN module uses 256 bytes of external data memory for message objects and supports both standard and extended identifiers.

It implements an enhanced 8051 core with eight independent datapointers, enabling efficient memory-to-memory transfers and flexible addressing of on-chip ROM (32 KB), XRAM (1 KB), and external memory space. The 10-bit successive-approximation ADC supports up to eight analog inputs with configurable reference (VAREF) and conversion start via software or timer trigger.

Key Specifications

Pinout & Package

P-MQFP-44 (Plastic Metric Quad Flat Package, 44-pin, 10 mm × 10 mm, 0.8 mm pitch) with exposed thermal pad - supports thermal dissipation in compact automotive PCB layouts and ensures mechanical compatibility with C501/C511 socket footprints.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar CAN-enabled microcontroller applications.

Compared with C505CA-4R, C505CALMCAFXQMA1 adds full lot-level traceability (QMA1), MSL3 packaging, and automotive qualification documentation; versus SJA1000T, it eliminates external bus interface design, reduces BOM count by 4+ components, and enables self-contained CAN node firmware deployment.

Availability

C505CALMCAFXQMA1 is available at Aetrix Electronics and suitable for automotive body electronics, door control units, and roof module applications requiring stable component supply, long-term lifecycle assurance, and full AEC-Q100-aligned manufacturing traceability.

Supply support for C505CALMCAFXQMA1 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

Infineon Technologies AG is a German semiconductor manufacturer specializing in power management, automotive ICs, and security solutions, with global R&D and wafer fabrication facilities.

The C500 family - including C505CALMCAFXQMA1 - was designed specifically for cost-optimized, real-time automotive control nodes requiring integrated CAN, analog sensing, and deterministic 8051-compatible execution.

FAQ

What is the maximum CAN bit rate supported by C505CALMCAFXQMA1?

The device supports up to 1 MBaud CAN bit rate when operating at ≥8 MHz system clock frequency. This is achieved using the internal CAN clock prescaler for oscillator frequencies above 10 MHz. Bit timing registers allow fine-grained configuration of synchronization segments, propagation time, and phase buffers per ISO 11898-1 requirements.

Does C505CALMCAFXQMA1 require an external crystal, or can it use an RC oscillator?

C505CALMCAFXQMA1 requires an external crystal or ceramic resonator connected to XTAL1/XTAL2 for stable CAN timing; the internal RC oscillator is not specified for CAN operation due to insufficient accuracy (<1% tolerance needed). Crystal frequencies from 1 MHz to 20 MHz are supported, with 8 MHz or higher recommended for 1 MBaud CAN.

How is the 10-bit ADC referenced, and can VAREF be driven externally?

The ADC uses an external reference voltage applied to the VAREF pin, which must be between 0 V and VDD. VAREF sets the full-scale input range - e.g., 2.5 V on VAREF yields 2.44 mV/LSB resolution. Internal reference is not available; VAREF must be supplied externally, typically from a precision voltage reference or ratiometric sensor supply.

Is C505CALMCAFXQMA1 pin-compatible with earlier C505 derivatives like C505C-2R?

Yes - C505CALMCAFXQMA1 uses the same P-MQFP-44 package and maintains pin-for-pin compatibility with C505C-2R, C505A-4R, and C505CA-4R variants. Port assignments, reset behavior, and peripheral pin mappings (e.g., P4.1 for CAN RX) are identical, enabling drop-in replacement in existing PCB layouts.