S32MのトピックRe: FRDM-A-S32M276-C064 overcurrent error on my encoder

FRDM-A-S32M276-C064 overcurrent error on my encoder

alovi — Wed, 24 Jun 2026 19:49:48 GMT

My hardware is:

FRDM-A-S32M276-C064
Faulhaber 3216 BXTH BLDC 12V
Encoder is IEF3 with 128L

I have connected it as shown in the starting guide

https://www.nxp.com/document/guide/getting-started-with-frdm-a-s32m276-development-board-setup-and-programming:GS-FRDM-A-S32M276

I have connected the encoder directly to the pins corresponding to the enconder and I dropped (Anegated, Bnegated, Inegated). In the provided code from the application hub I've set ENCODER 1, which runs the following (in the setup part):

Siul2_Port_Ip_SetInputBuffer(NULL_PTR, NULL_PTR, 1, 54, 3U);

//this effectively functions as:

//IP_SIUL2->IMCR[54] = SIUL2_IMCR_SSS(3U);

/* Assign eMIOS0_CH7 input to TRGMUX_OUT_38 */

Siul2_Port_Ip_SetInputBuffer(NULL_PTR, NULL_PTR, 1, 55, 4U);

Then

Lcu_Ip_SyncOutputValueType EncLcuEnable[6U];

EncLcuEnable[0].LogicOutputId = LCU_LOGIC_OUTPUT_8;

EncLcuEnable[0].Value = 1U;

EncLcuEnable[1].LogicOutputId = LCU_LOGIC_OUTPUT_9;

EncLcuEnable[1].Value = 1U;

EncLcuEnable[2].LogicOutputId = LCU_LOGIC_OUTPUT_10;

EncLcuEnable[2].Value = 1U;

EncLcuEnable[3].LogicOutputId = LCU_LOGIC_OUTPUT_11;

EncLcuEnable[3].Value = 1U;

Lcu_Ip_SetSyncOutputEnable(EncLcuEnable, 4U);

and finally

AEC_VDDE_Enable(1);

When I run this without the encoder connected, the application works correctly (sensorless). When I plug in the encoder and I rerun, it goes into fault immediately. Debugging I see the following:

alovi_0-1782330455130.png

which corresponds to an overcurrent event

#define AEC_AE_EVENTS_STATUS_OCD_VDDE_FL_MASK (0x8U)

#define AEC_AE_EVENTS_STATUS_OCD_VDDE_FL_SHIFT (3U)

How can I fix this problem? Any advice would be appreciated.

Re: FRDM-A-S32M276-C064 overcurrent error on my encoder

danielmartynek — Fri, 26 Jun 2026 12:43:54 GMT

Hello @alovi,

I understand that you are using VDDE to supply the encoder. However, the VDDE output current is limited.
Please note that 175 mA represents the maximum overcurrent detection threshold; the minimum threshold is not specified. At the same time, the VDDE pin can continuously supply up to 30 mA at 5 V.
Looking at the encoder datasheet, its current consumption can reach up to 40 mA even without load, which already exceeds the supported VDDE capability.

danielmartynek_1-1782477536185.png

danielmartynek_0-1782477280205.png

Best regards,

Daniel

Re: FRDM-A-S32M276-C064 overcurrent error on my encoder

alovi — Fri, 26 Jun 2026 14:20:11 GMT

Is there any other pin on the board that I can use to power the encoder or do I have to use an external source to power it?

Re: FRDM-A-S32M276-C064 overcurrent error on my encoder

danielmartynek — Wed, 01 Jul 2026 07:48:36 GMT

Hi @alovi,

Unfortunately, only VDDE can be used to supply external devices from the internal regulator.
In this case, an external regulator is required.

Regards,

Daniel