L9924L datasheet(76/84 Pages) STMICROELECTRONICS

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SPI interface

L9924L

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DocID028840 Rev 3

12.4.17

DRV SETTINGS register [0x09]

12.4.18

TEST MODE STATUS register [0x0B]

It is a reserved read-only test register: in test mode it returns 1 otherwise 0. The application

could read this register to check if the device is working in a correct condition.

Table 59. DRV SETTINGS register [0x09]

Bit

Reset value

Description

Reserved

CSA_ENABLE(1)

1. Current Sense Amplifier CANNOT be enabled before EXTP_LS (bit 8 of [0x03] register) has been

configured.

Curr. Sense Amplifier Enable

11-8 Reserved

L_LHC_PULLDW_DIS(2)

2. If this bit is active any standby request will be ignored.

L/LHC active pull down disable

RVC_EN

RVC protocol selection [4.3.13]

L_HS_EN(3)

3. High Side drivers need charge pump activation.

Turn on L-High side [4.3.13]

L_LS_EN(4)

4. After power-up, the Smart power logic will automatically activates the line (L or LHC) corresponding to the

detected KEY signal (KEY or LH-KEY). Both L_LS_EN and LHC_LS_EN bit are set at 1 independently on

effective status of the relevant the input that can be understood reading the wakeup source register.

HIGH side and LOW side drivers of L and LHC outputs CANNOT be activated at the same time: the Smart

Power has an embedded control logic to prevent the software from applying a wrong command. In this

case the outputs are off but the bits keep the programmed value. When switching from low side to high side

or vice versa, it is necessary to switch both the drivers off and then to activate the desired driver.

The default values L and LHC LS drivers are set to 1 in order to let the system to quickly switch the lamp(s)

on without waiting any SW command.

If the input receive is not engaged or the relevant wake-up source is disabled (see register 0x04), the driver

is off even if the bit is 1.

As specified in the relevant paragraph (Pin “L”), in case of overcurrent, the lamp output is automatically

turned off. In this case, before a new trial it is necessary to apply a suitable delay

Turn on L-Low side [4.3.13]

LHC_HS_EN(3)

Turn on LHC-High side

LHC_LS_EN(4)

Turn on LHC-Low side

VLHC_HS1_SEL

Over current threshold selection High side [4.3.15]

VLHC_LS1_SEL

Over current threshold selection Low side

[4.3.15]

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