L9779WD datasheet(9/170 Pages) STMICROELECTRONICS

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DocID027452 Rev 5

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L9779WD

Detailed features description

169

Detailed features description



Package

–

HiQUAD-64



5 V logic regulator

–

5 V precision voltage regulator (± 2%) with external NMOS

–

Max current regulated: 400 mA

–

Charge pump capacitor at pin CP is used to drive the gate of the external NMOS

transistor



3.3 V logic regulator

–

3.3 V precision voltage regulator (± 2%) with over-current protection

–

Max current regulated: 100 mA



5 V tracking sensor supply

–

2 x 5 V tracking sensor supply with protection and diagnosis on MSC

–

Short-circuit to Vbat/GND fully protected

–

Max current regulated: 2 x 100 mA



VDD_IO supply

–

All the digital output is supplied by external VDD_IO through VDD_IO pin



Smart reset

–

Main Reset monitoring VB_UV Logic voltage management and safety control



Watch dog

–

Main reset management 5 V voltage monitoring safety output disable

–

MicroSecond Channel activity watch dog

–

MSC controllable query and answer watch dog compliant with VDA2.0 level 3

(enabled by default)



Power latch

–

L9779WD is switched on by KEY_ON signal and switched off by logic OR of

KEY_ON signal and MicroSecond Channel bit



Secure engine off mode (default) switches off the drivers in the following order:

–

OUT1 through to OUT4 in 225 ms (typical)

–

OUT13 and OUT14 in 600 ms (typical)



Flying wheel interface function (VRS)

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The VRS is the interface between the microprocessor and the magnetic pick-up or

variable reluctance sensor that collects the information coming from the flying

wheel

–

Adaptive filtering on amplitude and timing adapts better the device response to

VRS input switching



Protected low-side driver

–

LSa (OUT1 to 5)

4 Ch. serial IN via MicroSecond Channel, Rdson = 0.72 Ohm @150 °C, Vcl = 58 V ±5,

Imax = 2.2 A;

1 Ch. serial IN via MicroSecond Channel, Rdson = 0.72 Ohm @150 °C, Vcl = 58 V ±5,

Imax = 3 A;

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