All,
I am both the hw and sw designer for a new project and the TI DRV8432DKD is not working well for me at all. I have many questions and need to open up an on-going question/answer session with a tech guru. i am trying to drive a piston and not a motor and not getting good results.
but before everything here are some of my "little" annoying questions that i am carrying around and need answered (after reading full data sheet many times ... this is just not my field):
1A) in cycle-by-cycle mode do the fault and otw lines go low for overcurrent or over temperaturre problems or does the 8432 handle the faults internally and not need user to toggle the reset line from high to low to clear the fault and get things working again?
1B) is the current limit resistor completely ignored in the CBC mode? so if i have one there it does not have any effect?
2) in the OC mode i see the fault and otw lines do yes go low for fault conditions but then must I wait or is it only good practice to wait 1.000 seconds before i toggle the reset line or can i toggle the reset line within the first 135nsec time once my sw senses a low on fault or otw line? Also if i have to do a reset to clear a fault then how long does the reset pulse have to stay low? Would a low pulse width of 135nsec duration be too short of a low pulse?
3) we are using the TI DRV8402DKD on older projects ... for my new project should i stay with the 8402 or move to the 8432? (My problem is that the Parallel full bridge with OC latching shutdown (mode: 011) is NOT supported by the 8432 and we make lots of use of it in the project for the 8402). When is the End-of-Life for the 8402 part? why is it not recommended for new design, is there something wrong with the part?
Thanks in advance,
Regards,
Steve Dunn
Electronics Engineer
R&D Department
Medispec Ltd.
40 Hataasiya Street
Yehud, Israel 56101
Tel: 073-247-0903
Fax: 03 632-2099
Mobile: 057-779-1610
E-mail: steve@medispec-int.com
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