L9969T datasheet(15/70 Pages) STMICROELECTRONICS

15 / 70 page

Figure 8. Overview of VDD voltage ranges

Device overall

Reset logic

VDD monitoring

Output stages

SPI function

VDD

18 V

5.6 V

VDD_THH

4.4 V

1.3 V

VDD_POR

VDD_MR_min

VDD_THL

2.6.2.4

Behavior on pin NABE in case of external short circuit

In case a short circuit on the PCB pulls both pins NABE and VDD for example, to the battery voltage (max. 18 V),

the internal power-stage at pin NABE is designed in such a way that the H-bridge is not damaged, in case NABE

is pulled-down internally to GND, even though an external battery voltage is applied low-ohmic to pin NABE. The

internal power-stage sustains such short-circuit for a few hours.

2.6.2.5

NABE Pin

NABE is a bidirectional pin (input and output). As an input function, all output power-stages are permanently

switched off if an external low signal is applied to pin NABE. NABE output is realized as an open drain low side

switch. During a VDD over-voltage (above VDD_THH) or undervoltage (below VDD_THL), the pin is pulled to GND

(logic low). Refer also to Section 2.6.2.4: Behavior on pin NABE in case of external short circuit in case of an

external short circuit at pin NABE.

The NABE-Pin is made redundant to the DIS-Pin to reach the ISO26262 Safety Goals. The NABE goes directly to

the Gate-Driver of the Bridge.

The default signal level of “NABE” (for example in case of ECU initialization) is low-level with integrated pull down-

current source.

L9969x

Electrical specifications

DS14029 - Rev 6

page 15/70

L9969T Datasheet(PDF) 15 Page - STMicroelectronics