Reduce size of ECUs with automotive-grade 8-bit MCUs

May 07, 2014 // By Graham Prophet
STMicroelectronics has expanded its 8-bit automotive-grade microcontroller portfolio with low-cost devices in compact packages, featuring 20 MIPS processing performance and a peripheral set optimised for automotive body electronics and comfort applications.

Based on ST’s 24MHz STM8A 8-bit processor core, the STM8AF6223 and STM8AF6226 feature an intelligent mix of connectivity, timing, and analogue functions for space-constrained modules such as seat controllers, window lifters, HVAC controls or gateways. An extended temperature range qualifies the MCUs for engine-compartment applications.

Features comprise 8 kBytes on-chip flash, 640 Bytes true data EEPROM (up to 300 kcycles), 1 kByte RAM, serial interfaces including LIN 2.1, and a 10-bit ADC. A clock security system, two watchdogs (one with independent clock), and a sophisticated memory-protection scheme ensure automotive-level dependability. Combining the simplicity and robustness of a 5V 8-bit architecture with automotive reliability, the AEC-Q100 qualified devices operate at temperatures up to 150°C and keep running down to 3.0V in cranking conditions.

A choice of compact packages is available. The smallest, the TSSOP20, has seven ADC inputs, and six capture/compare channels. The TQFP32 adds three complementary PWM outputs for driving BLDC motors. Example pricing is given by the STM8AF6223 in TSSOP20 with 85°C maximum temperature at $0.63 (10,000).

STMicroelectronics; www.st.com/stm8af6223-pr / www.st.com/stm8af6226-pr