ST ST7 - Page 16

16/317
1 - Introduction
01-anal
Such peripherals are typically available in many families. This example shows how two periph-
erals properly selected can drastically reduce the component count and thus the printed circuit
area. The solution shown may or may not fit the needs, but it is difficult to imagine a simpler
design.
+5v
Analog input
GND
Micro
controller
R
R
R
R
R
R
Array of
resistors
Current
generator
Analog keyboard
Analog display
Push pull
output with
PWM signal
Example of simplified circuitry thanks to a microcontroller