Peripherals and I/O for a compact sensor node
37 I/O lines are brought out on the 48-LQFP package, enough to handle a small keypad, a segment LCD, and a couple of serial sensors without a port expander. The 10-channel 12-bit ADC samples analog inputs directly, so a separate external ADC is unnecessary for most low-speed measurement loops. Brown-out detect and POR are integrated, reducing external supervisor IC count.
The 48-LQFP (7×7 mm) is a hand-solderable surface-mount package, practical for prototyping runs and low-volume production without a vision reflow line.