DRV8899-Q1: CTRL5 Control Register

TEZUKA FUMIKA

Part Number: DRV8899-Q1

EN_SR_BLANK bits are recommended to be set to "1" when controlled in Smart tune Dynamic Decay mode.
How do I use it? Also, please tell me why.

over 2 years ago

0 Wang5577 over 2 years ago

TI__Guru 56650 points

Teauka-san,

CTRL5 register is a reserved register. Where do you find "EN_SR_BLANK" bit in DRV8899-Q1?

Regards,

Wang

0 TEZUKA FUMIKA over 2 years ago in reply to Wang5577

Prodigy 150 points

sorry. I made a mistake in the part number. The correct name is DRV8889A.Regards,

0 Wang5577 over 2 years ago in reply to TEZUKA FUMIKA

TI__Guru 56650 points

Teauka-san,

Set "EN_SR_BLANK" =1 when controlled with slow-slow or either smart tune decay modes.

Either smart tune decay could have slow-decay operating. Additional blanking time is beneficial in case the stepper motor has excessive parasitic coil capacitance. Also, the blanking time can avoid the switching noise on the current sensing circuit during the power FET turn-on.

For example: when SLEW_RATE [1:0]=00b, the slew rate is 10v/us. With the highest input voltage 45V, the turn-on time is about 4.5us. 5.6us blanking time can avoid the switching noise in to the current sensing circuit.

Regards,

Wang Li

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DRV8899-Q1: CTRL5 Control Register