Infineon Technologies SAF-C868-1SR BA

Overview

SAF-C868-1SR BA from Infineon Technologies is an 8-bit single-chip microcontroller based on the C800 core, fully compatible with the 8051 architecture and extended with 8 datapointers. It features 8 KB on-chip program RAM, 256-byte on-chip RAM, a 5-channel 8-bit ADC, and operates from a single 3.3 V supply with internal 2.5 V core regulation. It targets embedded control in industrial sensors and motor interface modules requiring deterministic real-time I/O handling.

For engineers reviewing the SAF-C868-1SR BA datasheet, SAF-C868-1SR BA pinout, SAF-C868-1SR BA application, or SAF-C868-1SR BA equivalent, key selection criteria include its TSSOP-38 package, 40 MHz CPU clock capability (300 ns instruction cycle at 37.5 MHz), in-system programmability via 4 KB boot ROM, brown-out detection, and power-down mode with INT0/RxD wake-up support.

Technical Context

The C868 integrates a superset 8051-compatible CPU core with dual 16-bit timers (T0/T1 C501-compatible), plus Timer 2 with up/down counting and baudrate generation capability. Its capture/compare unit supports three 16-bit PWM channels and one dedicated 16-bit compare channel for precise timing control.

It includes a full-duplex UART, 5-channel 8-bit ADC with conversion start synchronization to timer 12/13, 13 interrupt vectors with four priority levels, and three low-power modes (slow-down, idle, power-down) - all managed under a single 3.3 V supply with internal voltage regulation to 2.5 V for the core.

Key Specifications

Pinout & Package

Packaged in P-TSSOP-38-1 (38-pin thin shrink small outline package), SAF-C868-1SR BA supports surface-mount assembly with thermal and mechanical reliability for industrial ambient conditions (–40 °C to +85 °C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with SAF-C868-1RR BA, the -1SR BA enables field firmware updates via ISP but requires boot ROM management; compared with SAK-C868-1SR BA, it trades extended temperature rating for lower cost in commercial-grade applications.

Availability

SAF-C868-1SR BA is available at Aetrix Electronics and suitable for industrial sensor nodes, BLDC motor interfaces, smart actuators, and legacy protocol gateways requiring stable component supply across multi-year production cycles.

Supply support for SAF-C868-1SR BA 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 embedded controllers, with global R&D and manufacturing infrastructure.

The C800 family-including the C868-was designed for cost-sensitive, real-time embedded control in industrial automation and motor drive systems where 8051 compatibility, low power, and mixed-signal integration are critical.

FAQ

What is the maximum operating frequency of the SAF-C868-1SR BA?

The SAF-C868-1SR BA supports an internal CPU clock up to 40 MHz, with a minimum instruction cycle time of 300 ns achievable at 37.5 MHz. External clock input must be 6.67–10.67 MHz with 50% duty cycle, and the internal PLL multiplies this to achieve the full CPU speed. This timing is verified in the May 2003 datasheet revision V1.0.

Does the SAF-C868-1SR BA support in-system programming (ISP)?

Yes - the device includes a dedicated 4 KB boot ROM that enables in-system programming of its 8 KB on-chip program RAM via UART. No external programmer is required, and the process is initiated through a specific hardware/software sequence documented in the C868 datasheet section on ISP.

What are the power supply requirements for SAF-C868-1SR BA?

The SAF-C868-1SR BA operates from a single 3.3 V ±10% supply. Internally, it regulates down to 2.5 V for the core logic (VDDC), while I/O circuits use the 3.3 V rail (VDDP). Separate power and ground pins (VDDP/VSSP and VDDC/VSSC) are provided to isolate digital noise from core voltage stability.

How many analog inputs does the SAF-C868-1SR BA support?

The SAF-C868-1SR BA integrates a 5-channel 8-bit successive-approximation ADC. Channels AN0–AN4 are mapped to P1.5–P1.7 and P3.0/P3.4 respectively. Conversion start can be triggered by software or synchronized to capture/compare timer 12/13, enabling precise timing-critical sampling.