VREF+ not working

[Ephraimoved]

Dear Sir.

Attached a schematic of STM32U585 .

LDO_V28 is tested for 2.8v.

Issuing the command

HAL_SYSCFG_VREFBUF_HighImpedanceConfig(SYSCFG_VREFBUF_HIGH_IMPEDANCE_DISABLE);

HAL_SYSCFG_VREFBUF_VoltageScalingConfig(SYSCFG_VREFBUF_VOLTAGE_SCALE2);

  HAL_SYSCFG_EnableVREFBUF();

No output at VREF+ .

Later the ADC_CALIBRATION gives an error.

Please Advise.

[waclawek.jan]

Read out and check/post VREFBUF_CSR register content.

JW

[Mohamed Aymen HZAMI]

Hello @Community member​,

Try this sequence :

1. __HAL_RCC_VREF_CLK_ENABLE();
2. HAL_SYSCFG_VREFBUF_HighImpedanceConfig(SYSCFG_VREFBUF_HIGH_IMPEDANCE_DISABLE);
3. HAL_SYSCFG_VREFBUF_VoltageScalingConfig(SYSCFG_VREFBUF_VOLTAGE_SCALE0);
4. HAL_SYSCFG_EnableVREFBUF();

Mohamed Aymen