170 MHz Cortex-M4 with mixed-signal peripherals
The part integrates 23-channel 12-bit ADC and 4-channel 12-bit DAC converters, making it a fit for motor control, digital power conversion, and industrial sensing applications where analog signal chain and real-time control share the same die.
64 KB Flash, 32 KB SRAM — firmware headroom check
The 64 KB Flash is sized for control-loop firmware with a modest application layer — think field-oriented motor control with sensorless observers, or a single-axis servo stack. The 32 KB SRAM holds two or three 12-bit ADC buffer sets plus the control variables; if your application needs a large display frame buffer or a TCP/IP stack, the G431's memory tier may be tight. The 170 MHz Cortex-M4 with FPU and DSP instructions does the heavy math, but the memory map sets the ceiling for what fits.
23-ch ADC, 4-ch DAC — analog integration
The 23-channel 12-bit ADC and 4-channel 12-bit DAC let this MCU handle multi-phase current sensing and analog set-point generation without external converters. The ADC channels cover three-phase current plus a DC-link voltage sense in a typical motor drive, with channels left over for temperature or position feedback. The four DAC outputs can generate analog reference voltages or drive analog actuators directly, saving board space and BOM cost compared to a separate ADC/DAC chip.
64-LQFP 10x10 mm — rework and layout
The 64-LQFP package with a 10x10 mm body and 0.5 mm pitch is a standard footprint that reflows reliably with a typical lead-free profile. The 52 I/O lines fan out to two or four inner layers; a two-layer board routes it with careful signal assignment.
That means ST continues to manufacture it, accept new orders, and support it with datasheets, errata, and application notes.