DocID026902 Rev 3
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UM1817
Hardware layout and configuration
57
2.3
STM32 power-mode configuration
Total three power modes are supported on the board that are configured by setting the
related jumpers
JP5, JP6, JP8, JP9 and JP12
and in the Notes
below.
•
Mode1: The VDD and VDDA are connected together and powered by fixed 3.3 V.
•
Mode2: The VDD and VDDA are connected together and powered by adjustable
voltage from 1.65 V to 3.6 V.
•
Mode3: The VDD is powered by adjustable voltage from 1.65 V to 3.6 V while VDDA is
powered by fixed 3.3 V.
Note:1
JP8 allows current measurement on VDD_MCU. Current measurement is performed by
replacing JP8 by an ammeter.
Note:2
JP12 allows current measurement on VDDIO2. Current measurement is performed by
replacing JP12 by an ammeter.
Note:3
JP6 allows to connect analog power source VDD_ANA to the STM32 VDDA. JP6 must be
opened (to disconnect VDDA from all analog power VDD_ANA which is connected to
analog circuits on the board) for STM32 Idd measurement.
Note:4
LD8 is lit when VDD < 2V and in this case STM32 is not functional. LD9 is lit when
VDDA < 2.4 V and in this case analogue parts in STM32F091VCT6 are not functional.
The LED LD5 is lit when the STM32091C-EVAL evaluation board is powered by the 5 V
correctly.
shows the low-voltage limitations that might apply depending on the characteristics
of some peripheral components. Components might work incorrectly when the power level
is lower than the limitation.
Table 3. Power mode related jumpers
Power mode
Power mode configuration
VDD_MCU Idd
measurement
(On JP8)
JP9
JP5
Mode1
OK
NOT allowed
Mode2
OK
Mode3
NOT allowed
1 2 3
1 2 3
1 2 3
1 2 3
1 2 3
1 2 3
1 2 3
1 2 3
