L9779WD datasheet(7/170 Pages) STMICROELECTRONICS

7 / 170 page

DocID027452 Rev 5

7/170

L9779WD

List of figures

Figure 1.

Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 2.

Pins connection diagram (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 3.

Application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Figure 4.

Configuration supplied by VB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 5.

Power-up/down management unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Figure 6.

Non-permanent supply power-up sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Figure 7.

Permanent supply power-up sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Figure 8.

Power-down sequence without power latch mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Figure 9.

Power-down sequence without power latch mode and PSOFF = 1 . . . . . . . . . . . . . . . . . . 27

Figure 10.

Power-down sequence with power latch mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Figure 11.

Power-down sequence with power latch mode and KEY_ON toggle . . . . . . . . . . . . . . . . . 29

Figure 12.

KEY_ON voltage vs. status diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Figure 13.

Smart reset circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Figure 14.

RST pin as a function of VDD5 (if CONFIG_REG6 bit3 = Low) . . . . . . . . . . . . . . . . . . . . . 36

Figure 15.

Structure regulators diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Figure 16.

Graphic representation of the calculation method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Figure 17.

Circuit and PCB layout suggested . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Figure 18.

VB overvoltage diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Figure 19.

VDD5 overvoltage diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Figure 20.

VDD5 vs battery: ramp-up diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Figure 21.

VDD5 vs battery (ramp-down diagram) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Figure 22.

Main relay driver controlled by L9779WD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Figure 23.

Scenario 1a: Standard on/off MRD driver with NO power latch mode bit PSOFF = 0 . . . . 50

Figure 24.

Scenario 1b: Standard on/off MRD driver with NO power latch mode bit PSOFF = 1 . . . . 51

Figure 25.

Scenario 2: Standard on/off MRD driver with power latch mode bit PSOFF = 0 . . . . . . . . 51

Figure 26.

Scenario 3a: Deglitch concept on KEY_ON at start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Figure 27.

Scenario 3b: Deglitch concept on KEY_ON during ON phase . . . . . . . . . . . . . . . . . . . . . . 52

Figure 28.

Scenario 4: Non standard on, KEY_ON removed before VB present . . . . . . . . . . . . . . . . 52

Figure 29.

Scenario 5: MRD overcurrent without VB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Figure 30.

Scenario 6: permanent MRD overcurrent with VBPOR restart . . . . . . . . . . . . . . . . . . . . . . 53

Figure 31.

Scenario 7 (temporary MRD overcurrent with VB POR restart) . . . . . . . . . . . . . . . . . . . . . 53

Figure 32.

Scenario 8 (temporary MRD overcurrent with VB µC commands restart) . . . . . . . . . . . . . 54

Figure 33.

LSa function OUT 1 to 5 (Injectors) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Figure 34.

LSb function OUT6, 7 (O2 heater) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Figure 35.

LSc function OUT19, 20 (low current drivers). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Figure 36.

LSd function OUT13 to 18 (relay drivers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Figure 37.

Behavior of OUT13, 14, 21, 25 with VB = VB_LV for a time shorter than Thold

and with a valid ON condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Figure 38.

Behavior of OUT13, 14, 21, 25 with VB = VB_LV for a time longer than Thold

and with a valid ON condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Figure 39.

Behavior of OUT13, 14, 21, 25 with VB that drops lower than POR threshold during

cranking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Figure 40.

LSx diagnosis circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Figure 41.

Fault encoding condition diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Figure 42.

LSx ON/OFF slew rate control diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Figure 43.

Ignition-pre drivers (IGN1 to 4) circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Figure 44.

Ignition-pre drivers (IGN1 to 4) diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Figure 45.

External MOSFET gate pre-drivers circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

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