L9945 datasheet(53/144 Pages) STMICROELECTRONICS

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[14:13] OC_TEMP_COMP_03: Over current detection with temperature compensation (see note of Table 30. SPI MOSI list)

00: No OC compensation

01: ΔT < 60 °C

10: ΔT < 40 °C

11: ΔT < 25 °C

[12] OC_BATT_COMP_03: Over current detection with battery compensation

0: Battery compensation de-activated

1: Battery compensation activated

[11:9] TBLANK_OC_03: When DSM is selected, it specifies the OC blanking time to allow VDS settling. When Rshunt is selected, it

only determines the assertion of the 'No OC failure' diagnostic code (once expired).

000: 11.1 µs

001: 15.6 µs

010: 20 µs

011: 31.1 µs

100: 42.2 µs

101: 53.3 µs

110: 97.8 µs

111: 142.2 µs

[8] PROT_CONFIG_03: Output re-engagement strategy. Specifies how channel reactivation must be performed following an OC

event. This bit has no effect for H-Bridge configuration. Behavior in case of HB is always as PROT_CONFIG_03 = '1'.

Diagnostics latches have to be cleared in case of OC in order to re-activate the bridge.

0: output re-engagement with control signal switching event

1: output re-engagement after diagnostic readout and control signal switching event

[7] OC_DS_SHUNT_03: Configures the output measure OC with shunt or by DSM

0: OC with DSM

1: OC with Shunt

[6] DIAG_I_CONFIG_03: CH3 OL regulator output current capability

0: 100 µA capability

1: 1 mA capability

[5:4] GCC_CONFIG_03: Selection of gate charge/discharge currents

00: Lim by ext resistor

01: 20 mA

10: 5 mA

11: 1 mA

[3] N_P_CONFIG_03: NMOS or PMOS option for HS configuration

0: Output configured for NMOS

1: Output configured for PMOS

[2] LS_HS_CONFIG_03: Configures the channel as LS or HS

0: LS configuration

1: HS configuration

[1] EN_OUT_03: Enable output 03

0: Output disabled

1: Output enabled

[0] PARITY: Parity bit, based on even parity calculation

0: If the number of 1 is odd

1: If the number of 1 is even

L9945

Functional description

DS12275 - Rev 10

page 53/144

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