Infineon Technologies SAK-C868-1SR BA

Overview

SAK-C868-1SR BA from Infineon Technologies is an 8-bit single-chip microcontroller based on the C800 core (8051 superset), featuring 8 KB on-chip program RAM, 256-byte on-chip RAM, 256-byte XRAM, and a 4 KB boot ROM for in-system programming. It operates at up to 40 MHz CPU clock (300 ns instruction cycle @ 37.5 MHz), supports 3.3 V single-supply operation with internal 2.5 V core regulation, and targets industrial embedded control applications requiring mixed-signal integration.

For engineers reviewing the SAK-C868-1SR BA datasheet, SAK-C868-1SR BA pinout, SAK-C868-1SR BA application, or SAK-C868-1SR BA equivalent, key selection criteria include its 5-channel 8-bit ADC with timer-synchronized conversion start, dual 16-bit capture/compare units for PWM generation, three 16-bit timers (including up/down Timer 2), full-duplex UART, and support for power-down mode with wake-up via INT0 or RxD.

Technical Context

The C868 implements an enhanced 8051-compatible architecture with eight datapointers and integrated analog peripherals including a 5-channel 8-bit ADC whose conversion trigger can be synchronized to Capture/Compare Unit Timer 12/13. Its memory subsystem includes 8 KB of on-chip program RAM (C868-1S variant), 256-byte on-chip RAM, and 256-byte XRAM - all accessible via dedicated addressing modes supported by the extended instruction set.

Power management is implemented through three low-power modes: slow-down, idle (combinable with slow-down), and power-down with wake-up capability on INT0 or RxD. The device uses an internal voltage regulator to derive 2.5 V core supply from a 3.3 V external rail, and includes brown-out detection and a programmable 16-bit watchdog timer for system reliability.

Key Specifications

Pinout & Package

SAK-C868-1SR BA is packaged in P-TSSOP-38-1 (38-pin thin shrink small outline package) with exposed thermal pad. Pin functions are validated per Infineon's May 2003 datasheet Figure 3 (top view).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SAK-C868-1SR BA, the -1RR variant trades ISP capability for ROM-based execution - reducing flexibility but increasing security against firmware tampering; the -1SR A-version retains full compatibility while adding automotive-grade stress test compliance and ESD hardening.

Availability

SAK-C868-1SR BA is available at Aetrix Electronics and suitable for motor control, industrial sensor interface, automotive body electronics, and power supply monitoring applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SAK-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 microcontrollers, with global R&D and manufacturing infrastructure.

The C868 belongs to Infineon's C800 family of 8-bit microcontrollers designed for cost-sensitive, real-time embedded control in industrial and automotive systems where analog integration, deterministic timing, and extended temperature operation are essential.

FAQ

What is the maximum CPU clock frequency and corresponding instruction cycle time for SAK-C868-1SR BA?

The SAK-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 CPU clock. This timing is derived from the C800 core's four-cycle-per-instruction architecture and verified in the May 2003 datasheet Section "C868 Advance Information".

Does SAK-C868-1SR BA support in-system programming, and how is it implemented?

Yes - in-system programming is enabled via a dedicated 4 KB boot ROM that executes first after reset and provides a serial bootloader interface. This allows reprogramming of the 8 KB on-chip program RAM over UART without requiring external programmers or chip removal, as confirmed in the "Advance Information" section of the datasheet.

What are the analog input capabilities, and how is ADC conversion triggered?

The device integrates a 5-channel 8-bit successive-approximation ADC with inputs AN0–AN4. Conversion start can be hardware-triggered by Capture/Compare Unit Timer 12 or 13, enabling precise synchronization between PWM generation and current/voltage sampling - a feature explicitly documented in the functional description on page 6.

Which power-saving modes does SAK-C868-1SR BA support, and what wake-up sources are available in power-down mode?

It supports slow-down mode, idle mode (optionally combined with slow-down), and power-down mode. In power-down mode, wake-up is possible only via external interrupt INT0 or UART receive pin RxD - both listed as valid wake-up sources in the "Power Saving Modes" section of the datasheet (page 6).