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VREFBUF enable for STM32L476VG not possible?

Question asked by Schaufel.Merlin on May 2, 2017
Latest reply on May 4, 2017 by Schaufel.Merlin

I am using a STM32L476VG (100 pin package, VREF+ not bonded to VDDA) for a mixed signal design. I planed to use the VREF+ as a 2.048V reference output. Currently there is no load on the VREF+ pin.

 

Unfortunately I always get a HAL_TIMEOUT while waiting for the VRR bit in the VREFBUF CSR register:

 

HAL_SYSCFG_VREFBUF_VoltageScalingConfig(SYSCFG_VREFBUF_VOLTAGE_SCALE0);
HAL_SYSCFG_VREFBUF_HighImpedanceConfig(SYSCFG_VREFBUF_HIGH_IMPEDANCE_DISABLE);
if (HAL_SYSCFG_EnableVREFBUF() != HAL_OK)
{
     Error_Handler(ENVREFO_ERROR);
}

Also no voltage output is measureable at the VREF+ pin...

Do I miss something here? I tried to change the order or manually set the registers (without time-out) but no output at all.

 

Thank you for your help!!

Best regards,

 

Merlin

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