DRV10983ZPWPR datasheet(36/58 Pages) TI1

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ecycles

1 mechcycle

sec ond

1530 RPM

sec ond

ecycle

minute

Motor phase

driving voltage

Open loop

Closed loop

FGOLset = 00

FGOLset = 01

Motor phase

driving voltage

Open loop

Closed loop

FGOLset = 10

Open loop

Closed loop

Start-up after power-on or wake

up from sleep/standby mode

Rest of the startups

DRV10983

SLVSCP6C – JULY 2014 – REVISED MAY 2016

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Figure 37. FG Behavior During Open Loop

9.4.11 Diagnostics and Visibility

The DRV10983 offers extensive visibility into the motor system operation conditions stored in internal registers.

This information can be monitored through the I2C interface. Information can be monitored relating to the device

status, motor speed, supply voltage, speed command, motor phase voltage amplitude, fault status, and others.

The data is updated on the fly.

9.4.11.1 Motor Status Read Back

The motor status register provides information on over-temperature (OverTemp), sleep or standby state

(Slp_Stdby), over current (OverCurr), and locked rotor (MtrLck).

9.4.11.2 Motor Speed Read Back

The motor operation speed is automatically updated in register MotorSpeed1 and MotorSpeed2 while the motor

is spinning. MotorSpeed1 contains the 8 most significant bits and MotorSpeed2 contains the 8 least significant

bits. The value is determined by the period for calculated BEMF zero crossings on phase U. The electrical speed

of the motor is denoted as ‘Velocity (Hz)’ and is calculated as shown in Equation 7.

Velocity (Hz) = {MotorSpeed1:MotorSpeed2} / 10

(7)

As an example consider the following:

MotorSpeed1 = 0x01;

MotorSpeed2 = 0xFF;

Velocity = 512 (0x01FF) / 10 = 51 Hz

For a 4-pole motor, this translates to:

DRV10983ZPWPR Datasheet(PDF) 36 Page - Texas Instruments

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