UM1879 Rev 4
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UM1879
Power consumption measurements
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Appendix A
Power consumption measurements
The power consumption measurements of the STM32L476 Discovery board are reflected in
. Note the GPIO configuration of the STM32L476VGT6 in standby mode.
Figure 20. Power consumption tree
3V3_REG
JP6
Measured 287µA
3V3
287-115 => 172µA
172-92 => 80µA
Measured 115 µA
D6
3V
Measured 92µA
LDO
/'
SB28
For IDD
TSZ122
1st stage
V+ : ~11µA due to resistors bridge
V- : ~11µA due to resistors bridge
115-70 => 45µA
Measured 70µA
R30
Audio
03
QuadSPI
14
L3GD20
DAC
&6
LSM303
CTR
3V_MFX
70-0.4 => 69.6µA
Measured 0.4µA
JP5
VDD_MCU
MFX
STM32L152
For IDD
TSZ122
2nd stage
V+ : ~10µA due to resistors bridge
STM32L476VGT6
STM32L476VGT6 GPIOs are configured in ‘Analog input’ except:
PWR->PUCRA = 0; // no PU on GPIOA
PWR->PDCRA = 0x2F; // PD on GPIOA[0,1,2,3,5]
PWR->PUCRB = 0; // no PU on GPIOB
PWR->PDCRB = 0; // no PD on GPIOB
PWR->PUCRC = 0x1; // PU on GPIOC[0] MAG_CS
PWR->PDCRC = 0x800; // PD on GPIOC[11]
PWR->PUCRD = 0x80; // PU on GPIOD[7] MEMS_SPI_CS
PWR->PDCRD = 0x12; // no PD on GPIOD[1,4] MEMS_SPI_CLK, MEMS_SPI_MOSI
PWR->PUCRE = 0x0001; // PU on GPIOE[0] XL_CS
PWR->PDCRE = 0x0200; // PD on GPIOE[9] AUDIO_CLK for DMIC
PWR->PDCRE|= 0x0074; // PD on GPIOE[2,4,5,6] SAI1 interface to CODEC
PWR->PDCRE|= 0xF400; // PD on GPIOE[10,12,13,14,15] QuadSPI CLK, D0,D1,D2,D3
PWR->PUCRF = 0; // no PU on GPIOF
PWR->PDCRF = 0; // no PD on GPIOF
PWR->PUCRG = 0; // no PU on GPIOG
PWR->PDCRG = 0; // no PD on GPIOG
PWR->PUCRH = 0; // no PU on GPIOH
PWR->PDCRH = 0; // no PD on GPIOH
