L9305EP datasheet(102/107 Pages) STMICROELECTRONICS

102 / 107 page

6.1.8

Parallel mode .......................................................... 24

6.1.9

Dither programming ..................................................... 25

6.1.10

Dither synchronization.................................................... 26

6.2

Software current control ........................................................ 26

6.3

Solenoid current control feedback................................................ 27

6.3.1

Average current ........................................................ 27

6.3.2

Integrator feedback ...................................................... 27

6.3.3

Solenoid PWM period feedback ............................................ 28

6.3.4

Out of regulation flag..................................................... 28

6.4

Solenoid driver and load diagnostic .............................................. 29

6.4.1

Thermal protection ...................................................... 29

6.4.2

Overcurrent protection ................................................... 29

6.4.3

Supply disconnection .................................................... 29

6.4.4

Off state solenoid diagnostics .............................................. 29

6.5

Valve driver electrical specifications .............................................. 31

High side fail safe pre-driver ......................................................35

7.1

Fail safe predriver diagnostic.................................................... 36

7.2

Fail safe predriver electrical characteristics ........................................ 36

Safety features ...................................................................38

8.1

Power supply monitoring and diagnostics ......................................... 39

8.1.1

VDD over and under voltage diagnostics ..................................... 39

8.1.2

VBATP supply over voltage................................................ 39

8.1.3

VCP supply under voltage................................................. 39

8.1.4

Bandgap regulators, internal analog and digital supply monitoring .................. 40

8.1.5

GND loss detection ...................................................... 40

8.1.6

Power supply monitoring and diagnostics electrical characteristics .................. 41

8.2

Main & reference oscillators..................................................... 42

8.2.1

Main and reference oscillators electrical characteristics .......................... 42

8.3

Safety switch-off path .......................................................... 42

8.3.1

Safety switch-off path electrical characteristics ................................. 43

8.4

Valve drivers ................................................................. 43

8.4.1

High side – low side current sense compare ................................... 43

8.4.2

Solenoid current control ADC check ......................................... 44

8.4.3

Digital control loop logic BIST .............................................. 44

8.4.4

Calibration data check.................................................... 44

8.4.5

Diagnostic comparators .................................................. 44

8.4.6

PWM check............................................................ 45

L9305

Contents

DS12774 - Rev 10

page 102/107

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