Up to 256Kb of Flash on-chip and 32Kb SRAM allow the STM32F091 to implement a Java stack, enabling it to host applications that deliver user experiences normally associated with larger or more expensive devices. All variants, including those in economical 48-pin packages, have at least six USARTs. Three of the USARTs are able to support smartcard, LIN, IrDA, and Modbus modes.
A flexible power architecture allows analogue circuitry, including the 12-bit 1.0µs ADC and two-channel 12-bit DAC, to be operated at up to 3.6V for maximum dynamic range, while digital circuits run at lower voltage to minimise power consumption. Device I/Os can be powered independently, allowing direct connection to a low-voltage companion device such as an application processor without using level shifters.
With built-in CAN2.0A/B support, the STM32F091 can address consumer in-car applications connected to the vehicle network, such as car radio, and industrial-control applications. Designers can also take advantage of an integrated touch-sensing controller, as well as a SysTick timer and an RTC that aid real-time performance and deliver time-of-day or calendar functions.
The STM32F091 is available in different packages including 48- and 64-pin styles, as well as a salt-atmosphere-compatible QFP100 suitable for smart utility meters in China. Prices start from $1.59 for the STM32F091CBT6 with 128Kb Flash in the QFP48, for orders of 10,000 unit quantities.