Datasheet

TMC4671 Datasheet • IC Version V1.3 | Document Revision V2.00 • 2020-Apr-17

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6. Space Vector PWM does not allow higher voltage utilization

The Space vector PWM of the TMC4671-ES does not allow higher voltage utilization.

7. Step Direction Counter not used as Target Position

The step direction counter of the TMC4671-ES correctly counts but is not available as target position.

8. Register write access to ABN encoder count register and N pulse status bits

Write access to count registers of TMC4671-ES cleared theses to zero and encoder N pulse input

signals were not available within the status register.

9. ENO and ENI

ENI (ENable Input) and ENO (ENable Output) of TMC4671-ES did partially work as intended (incom-

plete reset assignment, missing error sum clear on disable).

15.2 Actions to Avoid Trouble

What should be taken into account when moving from TMC4671-ES to TMC4671-LA?

•

update P and I parameter for the advanced PI controller in case of switching numerical representation

from Q8.8 to Q4.12 (classical PI controller is un-changed)

• mount pull-up resistors if required for gate driver control signals during power-on reset

•

check setting of SVPWM control bit to avoid un-wanted speed-up by SVPWM in torque mode (power-

on default is disable without speed-up)

•

check setting of additional hall_sync_pwm_enable bit for high speed application with usage of Hall

signals (power-on default is disable)

15.3 Recommendations

•

TMC4671-LA (TMC4671-ES2) is drop-in compatible to the TMC4671-ES. Nevertheless, the TMC4671-LA

needs to be functional qualiﬁed as replacement to avoid un-wanted behavior caused by corrections

of errata of TMC4671-ES.

For example: The space vector PWM /SVPWM) control bit does not have an eﬀect for the TMC4671-ES

in torque mode. The space vector PWM is corrected for the TMC4671-LA. So, if the SVPWM control

bit is un-wanted enabled for the TMC4671-ES, the TMC4671-LA would run approximately +12% faster

in torque mode with the same settings.

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