DRV8305 minimum pin configuration

Asif Ahmed

Other Parts Discussed in Thread: TIDA-00643, DRV8305

Hello -

I am building custom hardware, and have a question regarding the DRV8305. On the BOOSTXL-DRV8305, the "PWRGD" and "WAKE" pins are broken out. On the TIDA-00643 reference design, I see that the "PWRGD" pin is pulled logic HIGH (3.3v), and not connected to the MCU. Can I do something like this with the "WAKE" pin as well, or is it recommended to have this connected to the MCU??

I definitely want to be able to set the FETs into high-impedance, so I am definitely connecting the "ENGATE" to the MCU, but based on the data sheet it doesn't seem like the "WAKE" pin is required.

Please advise. Any help is appreciated.

-asifjahmed

over 8 years ago

0 Nicholas Oborny over 8 years ago

TI__Mastermind 21305 points

Hi Asif,

PWRGD is an open drain output indicating VREG undervoltage or watchdog fault. You can chose to use this or not.

WAKE is a pin used to bring the device out of SLEEP mode. If you do not expect to use SLEEP mode you can tie this to 3.3V or direct to PVDD through resistor.

0 Rick Duncan over 8 years ago

TI__Guru** 114905 points

Hi Asif,

Yes, you can pull the WAKE input pin high using a resistor. Doing so disables sleep mode increases the current used by the DRV8305 from <100uA typ to 4mA typ. If you are trying to reduce current when idle, it is recommended to control the WAKE pin.

PWRGD is an open drain output, which is why there is a pullup attached.

0 Asif Ahmed over 8 years ago in reply to Rick Duncan

Expert 1570 points

Thank you both Nick and Rick!!

Motor drivers

Motor drivers forum

DRV8305 minimum pin configuration