ST STM32G4 Series Reference Manual page 770

Operational amplifiers (OPAMP)
Bit 8 OPAINTOEN: Operational amplifier internal output enable.
0: The OPAMP output is connected to the output pin
1: The OPAMP output is connected internally to an ADC channel and disconnected from the
output pin
Bit 7 OPAHSM: Operational amplifier high-speed mode
The operational amplifier must be disable to change this configuration.
0: Operational amplifier in normal mode
1: Operational amplifier in high-speed mode
Bits 6:5 VM_SEL: Inverting input selection
00: VINM0 pin connected to OPAMP VINM input
01: VINM1 pin connected to OPAMP VINM input
10: Feedback resistor is connected to OPAMP VINM input (PGA mode), Inverting input
11: opamp_out connected to OPAMP VINM input (Follower mode)
Bit 4 USERTRIM: User trimming enable
This bit allows to switch from 'factory' AOP offset trimmed values to 'user' AOP offset trimmed
values
This bit is active for both mode normal and high-power.
0: 'factory' trim code used
1: 'user' trim code used
Bits 3:2 VP_SEL: Non inverted input selection
00: VINP0 pin connected to OPAMP5 VINP input
01: VINP1 pin connected to OPAMP5 VINP input
10: VINP2 pin connected to OPAMP5 VINP input
11: DAC4_CH2 connected to OPAMP5 VINP input
Bit 1 FORCE_VP: Force internal reference on VP (reserved for test)
0: Normal operating mode. Non-inverting input connected to inputs.
1: Calibration verification mode: Non-inverting input connected to calibration reference
voltage.
Bit 0 OPAEN: Operational amplifier Enable
0: Operational amplifier disabled
1: Operational amplifier enabled
770/2083
selection is depends on the PGA_GAIN setting
RM0440 Rev 1
RM0440