Other Parts Discussed in Thread: DRV8846
Hi, Team
Please help to check and provide parameters. We have table as below for DRV8846. But it's missing in DRV8834 datasheet.
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Hi Alvin,
What parameters do you want for the DRV8834?
Which pins do you want this information for?
We will investigate early next week, and should have a response by Tuesday.
Part Number: DRV8834
Hi Team,
2 quick questions regarding the Hi-Z state of the DRV8834
1. What leakage current from the device controlling the mode pins is acceptable to securely set the motor driver to Hi-Z mode?
2. The DRV8846 have the TRI-LEVEL INPUTS requirements for M0 of HI-Z state as below, but the datasheet of DRV8834haven't it, whether the spec of DRV8834 is same with 8846? could you share with me the VIZ/VIL/VIH range limit and the RPD/RPU of DRV8834?
3. customer found the pin voltage of M0 (tri-level pin) is 1.4v when it is vacant without connecting the GPIO, what is different with the 1.1 of DRV8846?
4.What is the key different HI-Z state spec between DRV8834 and DRV8846?
Thank you and best regards
Hi, Rick
Question is on M0 pin which is supposed to have 1,0,Z tri-state, but internally pulled down.
There is no spec on VIZ. To ensure Z state, how should customer connect this pin?
Hi Alvin and Joy,
Your questions appear to be the same. We hope to have a response no later than Wednesday.
Hi Alvin and Joy, (Updated with original questions)
Sorry for the delayed reply.
1. What leakage current from the device controlling the mode pins is acceptable to securely set the motor driver to Hi-Z mode?
Typically, Hi-Z is set by leaving the M0 pin floating or by configuriung the GPIO connected to the M0 as an input without a pullup or pulldown resistor.
Please see the typical pullup/pulldown resistor values below.
2. The DRV8846 have the TRI-LEVEL INPUTS requirements for M0 of HI-Z state as below, but the datasheet of DRV8834haven't it, whether the spec of DRV8834 is same with 8846? could you share with me the VIZ/VIL/VIH range limit and the RPD/RPU of DRV8834?
VIL < 0.7V
VIZ 0.8 to 1.8V
VIH >2V
Please see below for typical resistor values of the M0 input when in indexer mode.
3. customer found the pin voltage of M0 (tri-level pin) is 1.4v when it is vacant without connecting the GPIO, what is different with the 1.1 of DRV8846?
The voltage difference between the VIL and VIH of the DRV8834 is larger. This allowed the mid voltage of the DRV8834 resistor to be higher.
4.What is the key different HI-Z state spec between DRV8834 and DRV8846?
The typical pullup and pulldown resistor values have been adjusted for the higher voltage.
There is no spec on VIZ. To ensure Z state, how should customer connect this pin?
The input can be floated. When the device is configured as indexer mode, a pullup resistor is enabled to create a voltage of ~1.5V.
I found some information that should help.
1) If the customer is driving the M0 input, M0 is in recognized Hi-z state as long as the M0 input voltage is kept between 0.85v and 1.8v.
2) The internal pullup/pulldown resistance on the pin depends on the config pin. The values listed below are typical.
When the device is powered and:
config =1 , M0/Aphase : ~250k to gnd & ~150k to vint (3V typical)
config =0, M0/Aphase ~360k to gnd.
When the device is not powered:
M0/Aphase ~360k to gnd.
I did not find any additional information.