Infineon Technologies SAF-C161JI-LF CA

Overview

SAF-C161JI-LF CA from Infineon Technologies is a 16-bit single-chip microcontroller in the C166 family, featuring an on-chip SDLM interface compliant with SAE J1850 Class 2, 256 KB mask ROM, 2 KB IRAM, and 8 KB XRAM. It operates at up to 25 MHz CPU clock (80 ns instruction cycle), integrates a 12-channel 10-bit ADC (7.8 µs min conversion time), and supports CAN 2.0B via external transceiver. It targets automotive body control modules requiring robust serial diagnostics.

For engineers reviewing the SAF-C161JI-LF CA datasheet, SAF-C161JI-LF CA pinout, SAF-C161JI-LF CA application, or SAF-C161JI-LF CA equivalent, key selection criteria include SDLM bus timing compliance, 128-pin TQFP package I/O mapping, 25 MHz real-time execution capability, and mask-ROM-based firmware immutability for production deployment.

Technical Context

The SAF-C161JI-LF CA implements a 4-stage pipeline 16-bit CPU with register-based architecture, supporting single-cycle context switching and 16 MByte linear address space. Its peripheral set centers on vehicle diagnostics: SDLM (J1850 Class 2) is hardware-accelerated with dedicated protocol logic, while the 12-channel 10-bit ADC provides programmable sample timing down to 7.8 µs for sensor monitoring.

Timing control includes dual general-purpose timer units (5 timers total), two asynchronous/synchronous serial channels, and SPI - all synchronized to the on-chip PLL (configurable 1.5×–5× multiplication). The device lacks integrated CAN transceivers but supports CAN 2.0B via external PHY through Port 4/7 pins.

Key Specifications

Pinout & Package

SAF-C161JI-LF CA is housed in a 128-pin TQFP package with exposed thermal pad. Pin functions are multiplexed across eight I/O ports (P0–P9), with dedicated SDLM signal routing on Port 9 (SDA0/SCL0/SDA1/SCL1/SDA2) and CAN-capable pins on Ports 4 and 7 (shared function).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive diagnostic microcontroller applications.

Compared with SAK-C161JC-LF, SAF-C161JI-LF CA reduces pin count contention by omitting CAN logic, freeing Port 4/7 pins for SDLM expansion; versus SAF-C167CS-LF, it trades raw compute power for guaranteed J1850 Class 2 hardware compliance in legacy vehicle platforms.

Availability

SAF-C161JI-LF CA is available at Aetrix Electronics and suitable for automotive body control modules, door module controllers, roof modules, and seat control units requiring stable component supply and long-term mask-ROM firmware consistency.

Supply support for SAF-C161JI-LF CA 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 microcontrollers, with global manufacturing and R&D facilities.

The C166 family - including the C161JI derivative - was designed specifically for real-time automotive body electronics, emphasizing diagnostic bus integration (SDLM/J1850, CAN), deterministic interrupt latency, and high-reliability mask-ROM execution.

FAQ

Does SAF-C161JI-LF CA include an integrated CAN transceiver?

No. SAF-C161JI-LF CA contains a CAN protocol controller (CAN 2.0B Rev. 2.0B active) but requires an external CAN transceiver (e.g., Infineon TLE6250) for physical layer signaling. Its CAN functionality is accessible via multiplexed pins on Port 4 and Port 7, not dedicated CAN_TX/CAN_RX pins.

What is the role of the SDLM interface in SAF-C161JI-LF CA?

The SDLM (Serial Data Link Module) implements SAE J1850 PWM and VPW protocols at hardware level for Class 2 diagnostics. It handles bit timing, Manchester encoding/decoding, and CRC-8 calculation autonomously, enabling direct connection to vehicle OBD-II DLC without software bit-banging.

Can SAF-C161JI-LF CA execute code from external memory?

Yes. It supports up to 16 MBytes of external address space via a programmable external bus interface with five chip-select signals. Code can be fetched from external ROM or executed from external RAM using the EA (External Access) pin configuration and appropriate wait-state settings per memory region.

Is the 256 KB on-chip ROM field-programmable?

No. The 256 KB program memory is mask ROM, programmed during wafer fabrication. It cannot be reprogrammed in-system or in-field. Firmware updates require hardware replacement. This ensures tamper-resistant, production-grade code integrity for automotive safety-critical applications.