DRV8860PWPR datasheet(13/45 Pages) TI2

13 / 45 page

DRV8860, DRV8860A

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SLRS065E – SEPTEMBER 2013 – REVISED NOVEMBER 2015

8.3.3 Protection Circuits

The DRV8860 is fully protected against undervoltage, overcurrent and overtemperature events.

8.3.3.1 Overcurrent Protection (OCP)

When output current exceeds OCP trigger level, corresponding channel will be automatically turned off. nFault

pin will be set low and corresponding OCP flag in fault register will be set to 1.

Over current faults are automatically cleared whenever the corresponding output is turned off by setting the Data

bits in the Fault register are clear, nFAULT is released.

8.3.3.2 Open Load Detection (OL) - DRV8860 only

When any output is in off status (the corresponding Data Register bit is set to ‘0’), a current sink pulls the node

down with approximately 30 µA. If the voltage on the pin is sensed to be less than 1.2 V, then an open load

condition is reported. nFAULT is driven low and the OL bit of the fault register (F8:F1) corresponding to the

specific channel is set.

Open load faults are automatically cleared whenever the corresponding output is turned on by setting the Data

bits in the Fault register are clear, nFAULT is released.

8.3.3.3 Thermal Shutdown (TSD)

If the die temperature exceeds safe limits, all outputs will be disabled, and the nFAULT pin will be driven low.

Once the die temperature has fallen to a safe level, operation will automatically resume. The nFAULT pin will be

released after operation has resumed.

8.3.3.4 Undervoltage Lockout (UVLO)

If at any time the voltage on the VM pin falls below the undervoltage lockout threshold voltage, all circuitry in the

device will be disabled and internal logic will be reset. Operation will resume when VM rises above the UVLO

threshold. nFAULT will not be asserted in this condition.

8.3.3.5 Digital Noise Filter

The DRV8860 features an internal noise filter on all digital inputs. In a noisy system, noise may disturb the serial

daisy-chain interface. Without an input filter, this noise may result in an unexpected behavior or output state. The

digital input filter is capable of removing unwanted noise frequencies while allowing fast communication over the

serial interface.

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