RM0440 Rev 4 775/2126
RM0440 Voltage reference buffer (VREFBUF)
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23.3 VREFBUF trimming
The VREFBUF output voltage is factory-calibrated by ST. At reset, and each time the VRS
setting is changed, the calibration data is automatically loaded to the TRIM register.
Optionally user can trim the output voltage by changing the TRIM register bits directly. In this
case, the VRS setting will have no more effect on the TRIM register until the device is reset.
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