DRV2624: Diagnostics and Auto calibration modes both fail

Hi, Xu!

Welcome to E2E and thank you for your interest in our products!

Based on the datasheet, the motor is an ERM actuator as you mentioned. There shouldn't be any issue to handle this load. Is your actuator fixed to a solid mass during the auto-calibration and the diagnostics process? If you run the auto-calibration with the rest of registers in default state, do you have the same results?

Best regards,
Luis Fernando Rodríguez S.

Hi Luis,

Thanks for your confirmation.

No, I've been pressing the motor against the table to run the calibration.

The following reg&&value are the result after diagnostic and calibration. It seems that DIAG_Z_RESULT, BEMF_GAIN, A_CAL_COMP and A_CAL_BEMF have been already configured during the process, but not the correct result.

reg:0x0 0x3
reg:0x1 0x88 
reg:0x2 0x1f
reg:0x3 0x3b
reg:0x4 0xe9
reg:0x5 0x0
reg:0x6 0x50
reg:0x7 0x4b
reg:0x8 0x18
reg:0x9 0x0
reg:0xa 0x92
reg:0xb 0x8d
reg:0xc 0x0
reg:0xd 0x0
reg:0xe 0x7f

reg:0x1f 0x7d
reg:0x20 0xf3
reg:0x21 0x4c
reg:0x22 0x11
reg:0x23 0x37
reg:0x24 0x64
reg:0x25 0x80
reg:0x26 0x0
reg:0x27 0x10
reg:0x28 0x11
reg:0x29 0xc
reg:0x2a 0x2

BTW, I found that the output voltage of REG port is the same as the supply VDD and the resistance between VDD and REG is the same too.

Is this normal or the chip is damaged? (maybe shorted when welding)

Is the abnormality of the REG port the cause of the diagnostic and calibration failure?

Best regards,

Xu Yaoyang

Hi, Xu,

Than you for providing the additional information. Could you also provide your circuit schematic for more details, please? This is to have a better approach to the issue. As you mentioned, it is not normal to have the REG pin with the same voltage as VDD. It should throw a 1.8V level.

Best regards,
Luis Fernando Rodríguez S.

Hi Luis,

I am using the schematic in the reference documentation. Maybe there's some problem about the REG port. I will check it after we get the new chip.

It’s strange that calibration and diagnostics execute successfully when using the LRA default configuration.

Best regards,

Xu Yaoyang

Hi, Xu,

Curiously, the actuator specifications are related to an ERM, but the actuator seems to be an LRA. Probably you get good results because the actuator behaves like an LRA.

Please let me know if you have additional observations.

Best regards,

Luis Fernando Rodríguez S.