DRV10983ZPWPR datasheet(14/58 Pages) TI1

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PWM Output

Average Value

PWM in

Analog

PWM_

DCO

AVS,

Acceleration Current Limit

Closed Loop Accelerate

PWM duty

ADC

Speed

Command

Output

Amplitude

Motor

VCC

DRV10983

SLVSCP6C – JULY 2014 – REVISED MAY 2016

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Feature Description (continued)

9.3.2.4 Lock

When the motor is blocked or stopped by an external force, the lock protection is triggered, and the device stops

driving the motor immediately. After the lock release time tLOCK_OFF, the DRV10983 resumes driving the motor

again. If the lock condition is still present, it enters the next lock protection cycle until the lock condition is

removed. With this lock protection, the motor and device does not get overheated or damaged due to the motor

being locked (see Lock Detect and Fault Handling ).

During lock condition, the MtrLck Status bit (address 0x10, bit 4) is set. To further diagnose, check the register

FaultCode.

9.3.3 Motor Speed Control

The DRV10983 offers four methods for indirectly controlling the speed of the motor by adjusting the output

voltage amplitude. This can be accomplished by varying the supply voltage (VCC) or by controlling the Speed

Command. The Speed Command can be controlled in one of three ways. The user can set the Speed Command

by adjusting either the PWM input (PWM) or the analog input (Analog) or by writing the Speed Command directly

through the I2C serial port (I2C). The Speed Command is used to determine the PWM duty cycle output

(PWM_DCO) (see Figure 5).

The Speed Command may not always be equal to the PWM_DCO because DRV10983 has implemented the

AVS function (see AVS Function), the acceleration current limit function (see Acceleration Current Limit), and the

closed loop accelerate function (see Closed Loop Accelerate) to optimize the control performance. These

functions can limit the PWM_DCO, which affects the output amplitude.

Figure 5. Multiplexing the Speed Command to the Output Amplitude Applied to the Motor

The output voltage amplitude applied to the motor is accomplished through sine wave modulation so that the

phase-to-phase voltage is sinusoidal.

When any phase is measured with respect to ground, the waveform is sinusoidally coupled with third-order

harmonics. This encoding technique permits one phase to be held at ground while the other two phases are

pulse-width modulated. Figure 6 and Figure 7 show the sinusoidal encoding technique used in the DRV10983.

Figure 6. PWM Output and the Average Value

DRV10983ZPWPR Datasheet(PDF) 14 Page - Texas Instruments

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