L9945 datasheet(125/151 Pages) STMICROELECTRONICS

125 / 151 page

GCC_override_config

IPU or IPD [mA]

1 → 20

5 → 20

Note:

IPU is used to shut down PMOS, while IPD shuts down NMOS.

The GCC override configuration is applied as soon as an OC event is detected. The original GCC configuration is

restored once diagnostics have been read.

6.3.2

Output re-engagement strategy after an OC event

After an OC event, the affected output must be manually re-engaged. There are two reactivation strategies,

configurable via SPI bit prot_config_xx:

•

Output re-engagement with control signal switching event (default);

•

Output re-engagement after diagnostic readout and control signal switching event.

In case of H-Bridge configuration, the prot_config_xx has no effect. Re-engagement is always performed after

diagnostic readout.

Note:

Control signal can be either NONx or SPI_ON_OUTxx, depending on SPI_INPUT_SEL_xx bit

6.3.3

OC sensing strategy

OC detection is performed by sensing the voltage either on an external shunt resistor or between the drain and

the source of the external FET. Detection strategy can be selected on each channel independently by

programming the OC_DS_Shunt_xx bit as follows:

Table 38. OC sensing strategy

OC_DS_Shunt_xx

OC sensing strategy

Drain To Source Measurement (DSM)

Shunt Measurement

Figure 30. Overcurrent sensing method (example on a LS NMOS)

BATT34

OC_DS_SHUNT = 0 → VDS

OC_DS_SHUNT = 1 → VSH

LS NMOS

DRN3

VBATT

GNSP3

SNGP3

RPD

RSH

GND

DFW

CESD

PGND34

GADG0806171536PS

L9945

ON state diagnostics

DS12275 - Rev 8

page 125/151

L9945 데이터시트(PDF) 125 Page - STMicroelectronics

L9945 데이터시트(HTML) 125 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

데이터시트 다운로드

링크 URL