DRV8800: Question for DRV8800

Annie,

What load do you connect between OUT+ and OUT-? Do you test it on your board or on an EVM? What decay mode do you select? 

Hi 

No-load or both DC brush motors between out+/-. All are this waveform. It is the slow decay mode. The frequency of the PWM waveform is 1.5Khz.

Thanks.

Annie,

Please check datasheet Table 1: Control Logic Table and compare with OUT +/- and tell me which part is out of their expectation.

Hi,

Is this waveform correct without considering the glitch?

Thanks.

Annie,

To me, any waveform is correct if we can explain it. Please compare the output with the input signal to see which section is out of the expectation and need to explain.

Hi,

Customer also have below two questions need your help.
1. Is it possible to collect the current of the chip in the pin8? He uses the single chip to collect. If it is possible, what does he need to pay attention to?
2. The temperature is below minus 40 degrees. What is need to pay attention to if the chip drive motor with load?

Thanks.

Annie,

Do they close the waveform issue?

The DRV8800 PWP package's pin 8 is different than QFN package's pin 8.

"Is it possible to collect the current of the chip in the pin8?"  What do you mean "collect"? Do you mean monitor?

If the temperature is out of Absolute Maximum Ratings range, I cannot guarantee anything.

Hi,

I'm sorry to say that customer has not told me if the waveform issue has been solved.

Meanwhile, may I confirm with you that customer's device is DRV8800, but there is DRV8880 and DRV8889 in your response. 

Customer wants to know is it possible to get the working current of the motor using Pin8?

Thanks.

Annie,

Sorry, I mean the DRV8800 PWP package's pin 8 is different than QFN package's pin 8. I have updated the previous post.

Assume it is PWP package, the pin 8 is 'Sense' pin. The motor winding current goes through the sense resistor (see figure 6). Customers can add their own circuit to collect or measure the working current from it.