DRV10983: An Inquiry

Hi Mohamed,

1. What is the difference between DRV10983PWP and DRV10983PWPR? This is package quantity as shown below (from data sheet)

2. If no microcontroller is used, can all PINS 10 (SCL), 11 (SDA), 12 (FG), 13 (SPEED), and 14 (DIR), be left floating?

Do not leave floating, DIR controls direction of motor. If DIR pin state changes driver stops the motor and restarts in the new direction if changed or same. 

SDA, SCL keep it pulled high if you need to program or read status . 

Cleaner practice to commit the lines to know state instead of floating.

3. In the datasheet, it is mentioned "The following order of connections should be followed in order to avoid
hot-switching and floating ground, which may cause reliability issues: 1 - GND, 2 - VCC, 3 - PWM, 4 - FG", how and when should this order of connection be achieved?

Connecting ground before any other signal ensures a proper reference for rest other signal. This followed by VCC ensure device is now biased properly.

Can you provide me your application details?

Thanks and Best Regards,

Venkatadri S

Hi Venkatadri,

I will be using the chip to drive a fan at a constant speed in one direction. So no need for micro-controller. If you have a reference design with the above pins committed, I would appreciate to share.

Thanks,

Mohamed

Hi Mohamed,

You can create circuit for pins like listed below,

SPEED pin-> This is has internal pull down 55Kohm , but you need a speed command. You can use provide resister divider for desired speed since you mentioned constant speed.

SCL/SDA - > Keep pull with 4.7kOhm to 3.3C to 3.3V LDO of DRV

FG is tach output you can terminate with pull up value (4.7k)

DIR pin either high or Low for desired speed.

There is ceiling fan reference design TIDA-00386 reference design | TI.com  . But this used MSP430 for functional control.

Thanks and Best Regards,

Venkatadri S

Thanks again Venkatadri.

For the SPEED, I understand can be programmed to the EEPROM. In this case, what should do for the PIN?

For DIR, for low, can connect to GND? For high, can pull with a resistor to VCC?