STM32W108C8

STM32W108C8
Integrated voltage regulator
Table 20.
1.8 V integrated voltage regulator specifications (continued)
Parameter Min. Typ. Max. Units Comments
1V8 regulator start-up time 50 µs
1V25 regulator start-up time 50 µs
0 V to POR threshold 2.2
µF capacitor
0 V to POR threshold 1.0
µF capacitor
An external 1.8 V regulator may replace both internal regulators. The STM32W108C8 can
control external regulators during deep sleep using open-drain GPIO PA7, as described in
Section 8: General-purpose input/outputs. The STM32W108C8 drives PA7 low during deep
sleep to disable the external regulator and an external pull-up is required to release this
signal to indicate that supply voltage should be provided. Current consumption increases
approximately 2 mA when using an external regulator. When using an external regulator the
internal regulators should be disabled through software.
Doc ID 018587 Rev 2 54/215