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Hardware Layout and configuration
2.3
MCU power modes configuration
Total three power modes are supported on the board, and can be configured by setting the
related jumpers JP5, JP6, JP8, JP9 and JP12 as described
Notes.
•
Mode1: The VDD and VDDA are connected together and powered by fixed 3.3V.
•
Mode2: The VDD and VDDA are connected together and powered by adjustable
voltage from 1.65V to 3.6V.
•
Mode3: The VDD is powered by adjustable voltage from 1.65V to 3.6V while VDDA is
powered by fixed 3.3V.
Power mode
Note:
JP8 allows current measurement on VDD_MCU. Current measurement is performed by
replacing JP8 by an ammeter.
Note:
JP12 allows current measurement on VDDIO2. Current measurement is performed by
replacing JP12 by an ammeter.
Note:
JP6 allows to connect analog power source VDD_ANA to the MCU VDDA. JP6 must be
opened (to disconnect VDDA from all analog power VDD_ANA which is connected to
analog circuits on the board) for MCU Idd measurement.
Note:
LD8 is lit when VDD<2V and in this case MCU is not functional. LD9 is lit when VDDA<2.4V
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 5V
correctly.
Table 3
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.
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Table 2. Power mode related jumpers
Mode1
Mode2
Mode3
DocID026902 Rev 2
Power mode configuration
JP9
1 2 3
1 2 3
1 2 3
1 2 3
inTable 2
and in the below
VDD_MCU Idd
measurement
JP5
(On JP8)
OK
1 2 3
NOT allowed
1 2 3
OK
1 2 3
NOT allowed
1 2 3
UM1817
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