DRV8461SPWPR datasheet(19/117 Pages) TI

19 / 117 page

Table 7-3. Pin function, PWP package (continued)

Pin Number

DRV8461SPWPR (SPI)

DRV8461PWPR (H/W Interface)

SCLK

Table 7-4 compares the feature set and diagnostic features for the two operating interfaces -

Table 7-4. Feature Set Difference

Feature

H/W interface

SPI

Smart tune

Yes

Up to 1/256 microstepping

Yes

Separate logic supply (VCC)

Yes

nHOME output

Yes

nFAULT output

Yes

Automatic microstepping

Yes

Customizable microstepping

Yes

Indexer output

Yes

Internal 3.3V reference voltage

Yes

Dual STEP active edge

Yes

Silent step decay

Yes

Auto-torque

Yes

Standstill power saving

Yes

Spread spectrum

Yes

Protection features

VM and VCP UVLO

Yes

VCC Power on Reset

Yes

Overcurrent Protection

Yes

Open-load detection

Yes

Thermal shutdown

Yes

Stall detection

Yes

Overtemperature warning

Yes

7.3.2 Stepper Motor Driver Current Ratings

Stepper motor drivers can be classified using three different numbers to describe the output current: peak, RMS,

and full-scale.

7.3.2.1 Peak Current Rating

The peak current in a stepper driver is limited by the overcurrent protection trip threshold IOCP. In general the

minimum value of IOCP specifies the peak current rating of the stepper motor driver. For the DRV8461, the peak

current rating is 4.8 A per bridge.

7.3.2.2 RMS Current Rating

The RMS current is determined by the thermal considerations of the IC. The RMS current is calculated based on

the RDS(ON), rise and fall time, PWM frequency, device quiescent current, and package thermal performance in a

typical system at 25°C. The actual operating RMS current may be higher or lower depending on heatsinking and

ambient temperature. For the DRV8461, the RMS current rating is 2.1 A per bridge.

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DRV8461

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