VN7140AS12 datasheet(24/39 Pages) STMICROELECTRONICS

Teilenummer	VN7140AS12

Bauteilbeschribung	High-side driver with Multisense analog feedback for automotive applications

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Hersteller	STMICROELECTRONICS [STMicroelectronics]

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24 / 39 page

Application information

VN7140AS12

24/39

DocID029756 Rev 2

4.3

MCU I/Os protection

If a ground protection network is used and negative transients are present on the VCC line,

the control pins will be pulled negative. ST suggests to insert a resistor (Rprot) in line both to

prevent the microcontroller I/O pins from latching-up and to protect the HSD inputs.

The value of these resistors is a compromise between the leakage current of

microcontroller and the current required by the HSD I/Os (Input levels compatibility) with

the latch-up limit of microcontroller I/Os.

Equation

VCCpeak/Ilatchup

≤ Rprot ≤ (VOHµC - VIH - VGND) / IIHmax

Calculation example:

For VCCpeak = -150 V; Ilatchup

≥ 20 mA; VOHµC ≥ 4.5 V

7.5

kΩ ≤ Rprot ≤ 140 kΩ.

Recommended values: Rprot = 15

kΩ

4.4

Multisense - analog current sense

Diagnostic information on device and load status are provided by an analog output pin

(Multisense) delivering the following signals:



Current monitor: current mirror of channel output current

Figure 32: Multisense and diagnostic

– block diagram

VN7140AS12 Datenblatt(PDF) 24 Page - STMicroelectronics