TMP821

SLDS152A – JANUARY 2008 – REVISED MAY 2015

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Feature Description (continued)

NOTE

After power is supplied to the device, the Lock Detection pin (AL) may remain high for a

few hundred milliseconds (see Figure 4).

7.4 Device Functional Modes

7.4.1 Lock Detection Pin

When rotor is locked, the drive is enabled until the voltage at LD pin reaches a higher threshold. Once the

voltage reaches a higher threshold, the drive is disabled until the LD capacitor discharges to a lower threshold.

7.4.2 Run

If the motor is unlocked and hall sensor inputs and drive signals are connected properly, the motor starts

spinning.

8

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