DRV8353FS datasheet(36/83 Pages) TI2

36 / 83 page

Figure 8-23 shows the structure of the open-drain output pins nFAULT and SDO. The open-drain output requires

an external pullup resistor to function correctly.

DVDD

Active

OUTPUT

No Fault

STATE

Inactive

STATUS

Fault

Active

Inactive

RPU

Figure 8-23. Open-Drain Output Pin Structure

8.3.4 Low-Side Current-Shunt Amplifiers (DRV8353F)

The DRV8353F integrate three, high-performance low-side current-shunt amplifiers for current measurements

using low-side shunt resistors in the external half-bridges. Low-side current measurements are commonly used

to implement overcurrent protection, external torque control, or brushless DC commutation with the external

controller. All three amplifiers can be used to sense the current in each of the half-bridge legs or one amplifier

can be used to sense the sum of the half-bridge legs. The current shunt amplifiers include features such

as programmable gain, offset calibration, unidirectional and bidirectional support, and a voltage reference pin

(VREF).

8.3.4.1 Bidirectional Current Sense Operation

The SOx pin on the DRV8353F outputs an analog voltage equal to the voltage across the SPx and SNx pins

multiplied by the gain setting (GCSA). The gain setting is adjustable between four different levels (5 V/V, 10 V/V,

20 V/V, and 40 V/V). Use Equation 3 to calculate the current through the shunt resistor.

VREF

SOx

CSA

SENSE

(3)

SPx

SNx

SOx

VREF

0.1 …F

RSENSE

VCC

Figure 8-24. Bidirectional Current-Sense Configuration

DRV8350F, DRV8353F

SLVSFV1B – AUGUST 2018 – REVISED AUGUST 2021

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DRV8353FS Datasheet(PDF) 36 Page - Texas Instruments

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