NCV7728DPAR2G datasheet(25/27 Pages) ONSEMI

25 / 27 page

NCV7728

www.onsemi.com

Fault Handling

At an event of a driver latched off fault, the offending

half−bridge driver is disabled and the half−bridge

configuration is defaulted to zero (HBENx =0, HBCNFx =

0). The user is required to clear the output register fault and

to resend the proper SPI frame to turn on the drivers. A driver

that is locked out during a fault conditions auto recovers to

the previous programmed state when the fault is resolved. A

latched fault flag on the serial output doesn’t always

translate an output latched off fault.

The summary of all fault conditions, the driver status and

the clear requirements are provided in Table 5.

Table 5. FAULT SUMMARY

Fault

Fault Memory

Serial Output Bit

Driver

Condition During Fault

Driver

Condition after Parameters

Within Specified Limits

Output Register Clear

Requirement

Under Load

(ULDSC = 0)

Latched

Outputs Unchanged.

Allowed to turn/ remain on

Allowed to turn/remain on

Valid SPI frame with

SRR set to 1

Under Load

(ULDSC = 1)

Latched (Note 6)

Offending Half−Bridge is

Latched Off (LS and HS)

Offending Half−Bridge is

Latched Off

(LS and HS)

Valid SPI frame with

SRR set to 1

Over Current

Latched (Note 6)

Offending Output is

Latched Off

(LS and HS)

Offending Output is Latched

Off

(LS and HS)

Valid SPI frame with

SRR set to 1

Thermal Warning

Non−Latched

Outputs Unchanged.

Allowed to turn/ remain on

provided that device is not

in thermal shutdown

Allowed to turn/remain on

Temp below (thermal

warning temp –

hysteresis)

Thermal Shutdown

Latched (Note 6)

Offending Half−Bridge

Drivers are Latched Off

(LS and HS)

Offending Half−Bridge is

Latched Off (LS and HS)

Valid SPI frame with

SRR set to 1.

Temperature blow

(thermal shutdown −

hysteresis)

VS Power Supply

Fail (Over−Voltage:

OVLO = 0)

Non−Latched

Outputs Unchanged.

Allowed to

turn/ remain on

Allowed to turn/remain on

VS below (Over Voltage

Threshold – hysteresis)

VS Power Supply

Fail (Over−Voltage:

OVLO = 1)

Non−Latched

All Drivers are Locked

Out.

Outx

³ High Z

Previous Half−Bridge status

and driver configuration is

maintained. Allowed to

turn/remain on

Auto Recovers if the VS

voltage is below

overvoltage threshold

VS Power Supply

Fail (Under

Voltage)

Non−Latched

All Drivers are Locked

Out.

Outx

³ High Z

Previous Half−Bridge status

and driver configuration is

maintained. Allowed to

turn/remain on

Auto Recovers if the VS

voltage is above the

Under Voltage

threshold

6. Latched conditions are cleared via the SPI SRR input bit = 1, by cycling the EN pin or with a power−on reset of VCC.

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