DRV10975ZPWPR datasheet(38/65 Pages) TI1

38 / 65 page

Motor phase

driving voltage

Open loop

Closed loop

FGOLsel = 00

FGOLsel = 01

Motor phase

driving voltage

Open loop

Closed loop

FGOLsel = 10

Open loop

Closed loop

Start-up after power on or wakeup

from sleep or standby mode

Rest of the startups

DRV10975, DRV10975Z

SLVSCP2E – JANUARY 2015 – REVISED MAY 2018

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Product Folder Links: DRV10975

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8.4.10.2 FG Open-Loop and Lock Behavior

Note that the FG output reflects the driving state of the motor. During normal closed loop behavior, the driving

state and the actual state of the motor are synchronized. During open loop acceleration, however, this may not

reflect the actual motor speed. During a locked motor condition, the FG output is driven high.

The DRV10975 provides three options for controlling the FG output during open loop as shown in Figure 36. The

selection of these options is determined by the FGOLsel[1:0] setting.

•

Option0: Open loop output FG based on driving frequency

•

Option1: Open loop no FG output (keep high)

•

Option2: FG output based on driving frequency at the first power-on start-up, and no FG output (keep high)

for any subsequent restarts

Figure 36. FG Behavior During Open Loop

8.4.11 Diagnostics and Visibility

The DRV10975 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.

8.4.11.1 Motor Status Readback

The motor status register provides information on overtemperature (OverTemp), sleep or standby state

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

DRV10975ZPWPR Datasheet(PDF) 38 Page - Texas Instruments

DRV10975ZPWPR Datasheet(HTML) 38 Page - Texas Instruments

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