Figure 143. Follower Configuration - ST STM32L4x6 Reference Manual

Operational amplifiers (OPAMP)
Follower configuration mode
The procedure to use the OPAMP in follower mode is presented hereafter.
•
configure OPAMODE bits as "internal follower"
•
configure VP_SEL bits as "GPIO connected to VINP".
•
As soon as the OPAEN bit is set, the signal on pin OPAMP_VINP is copied to pin
OPAMP_VOUT.
Note: The pin corresponding to OPAMP_VINM is free for another usage.
Note: The signal on the operational amplifier output is also seen as an ADC input. As a
consequence, the OPAMP configured in follower mode can be used to perform impedance
adaptation on input signals before feeding them to the ADC input, assuming the input signal
frequency is compatible with the operational amplifier gain bandwidth specification.
592/1693

Figure 143. Follower configuration

DocID024597 Rev 3
RM0351