L99MH98 datasheet(139/147 Pages) STMICROELECTRONICS

139 / 147 page

3.4

Charge pump ................................................................. 27

Gates driver ......................................................................29

4.1

Outputs driving signals ......................................................... 29

4.2

Indirect current measurement for external MOSFET ................................ 30

4.2.1

Rds(on) calibration at application level ....................................... 30

4.2.2

Vds measurement ....................................................... 31

4.2.3

Temperature measurement for calibration and monitoring......................... 32

4.2.4

H-bridge current calculation ............................................... 33

4.3

Power ON/OFF ............................................................... 33

4.3.1

Three stages gate current ................................................. 33

Protections and diagnostics ......................................................35

5.1

Reverse polarity protection ..................................................... 35

5.2

Programmable cross current protection time (DT) .................................. 35

5.3

Short circuit detection/drain source monitoring (DSHS/DSLS) ........................ 35

5.4

Diagnostic in off-mode ......................................................... 36

5.4.1

Off-state diagnostic introduction ............................................ 36

5.4.2

Example with a DC motor controlled by two half-bridges.......................... 37

5.4.3

Normal load conditions ................................................... 37

5.4.4

Short circuit to VDH ...................................................... 39

5.4.5

Short circuit to GND ..................................................... 40

5.4.6

Open load - SH1 disconnected ............................................. 40

5.4.7

Open load - SH2 is disconnected ........................................... 41

5.5

Summary of the off-state diagnostic .............................................. 41

5.6

Off-state diagnostic with more cascaded motors.................................... 42

5.7

Diagnostic not output (DIAGN) .................................................. 43

5.8

Configurable window watchdog.................................................. 44

Serial peripheral interface (SPI) ...................................................46

6.1

Physical layer................................................................. 46

6.2

Clock and data characteristics................................................... 47

6.3

Communication protocol........................................................ 47

6.3.1

SDI frame ............................................................. 47

6.3.2

SDO frame ............................................................ 48

6.3.3

Protocol failure detection.................................................. 49

6.4

SPI communication scenarios ................................................... 50

6.4.1

Write access scenario .................................................... 50

6.4.2

Read access scenario.................................................... 51

6.4.3

Clear on read scenario ................................................... 52

L99MH98

Contents

DS14611 - Rev 3

page 139/147

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