6.3

Control Inputs

The device is controlled through the following logic inputs:

•

SD: active low shutdown input;

•

BRAKE: active low brake input;

•

INA, INB: active high logic inputs for channel A and channel B driver outputs;

•

iLOCK: used to enable or disable the interlocking protection.

The operation of the driver IOs is described in Table 9.

Table 9. Inputs truth table (applicable when device is not in UVLO or "safe state")

Input pins(1)

Output pins

iLOCK

SD

BRAKE

INA

INB

GOUT_A

GOUT_B

X

L

X

X

X

Low

Low

X

H

L

X

X

Low

HIGH

X

H

H

L

L

Low

Low

X

H

H

H

L

HIGH

Low

X

H

H

L

H

Low

HIGH

Interlocking

VDD

H

H

H

H

Low

Low

GND

H

H

H

H

HIGH

HIGH

1. X: Don’t care.

A deglitch filter allows input signals with duration shorter than tdeglitch to be ignored, thereby preventing noise

spikes potentially present in the application from generating unwanted commutations.

6.4

Watchdog

The isolated HV side has a watchdog function in order to identify when it is not able to communicate with LV side,

for example because the VDD of the LV side is not supplied. In this case the output of the driver is forced in “safe

state” until communication link is properly established again.

6.5

Thermal shutdown protection

The device provides a thermal shutdown protection. When junction temperature reaches the TSD temperature

threshold, the device is forced in “safe state”. The device operation is restored as soon as the junction

temperature is lower than TSD - Thys.

6.6

Standby function

In order to reduce the power consumption of both control interface and gate driving sides the device can be put in

standby mode. In standby mode the quiescent current from VDD and VH_x supply pins is reduced to IQDDS and

IQHS_x respectively, and the output remains in ‘safe state’ (the output is actively forced low).

The way to enter standby is to keep the SD low while keeping the other input pins (INA, INB and BRAKE) high

(“standby” value) for a time longer than tSTBY. During standby the inputs can change from the “standby” value.

To exit standby, inputs must be put in any combination different from the “standby” value for a time longer than

tstbyfilt , and then in the “standby” value for a time t such that tWUP< t < tSTBY.

When the input configuration is changed from the “standby” value, the output is enabled and set according to

inputs state after a time tawake.

STGAP2HD

Control Inputs

DS13652 - Rev 2

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