L9945 datasheet(52/144 Pages) STMICROELECTRONICS

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COMMAND 3

Frame partitioning

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10

Description:

Output configuration OUT2

[31:28] C: Command 3

0011

[27] R/W: Bit to read/write configuration

0: Write & request read

1: Request read only

[26] HB1_ILIM_EN: H-bridge1 current limit activation. CH3 OC threshold is used for current limitation, it is only valid for Shunt

measurement

0: Current limitation not active

1: Current limitation active

[25] HB1_AFW: H-bridge1 active freewheel configuration on LS

0: Passive freewheeling

1: Active freewheeling

[24] GCC_OVERRIDE_CONFIG: Selection of the GCC override configuration upon OC detection. It has no effect if GCC[1:0] = '00'

(current limited by external resistor)

0: Selective override:

1 mA --> 5 mA

5 mA --> 20 mA

1: Global override:

1 mA --> 20 mA

5 mA --> 20 mA

[23:22] TDIAG_CONFIG_03: OFF state diagnostic blanking/filter timer for output 03. It has no effect if HB1_config =1 &

HB1_tdiag_ext_config = 0

00: 25.6 µs

01: 61.2 µs

10: 105.6 µs

11: 150 µs

[21] OC_READ_03: Selection of the OC threshold to read. Fixed threshold or actual threshold.

0: Read fixed OC threshold

1: Read actual OC threshold

[20:15] OC_CONFIG_03: Selection of over current detection threshold. 6 bit to code for the OC detection threshold

See Table 40

L9945

Functional description

DS12275 - Rev 10

page 52/144

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