L6482 datasheet(27/73 Pages) STMICROELECTRONICS

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L6482

Functional description

Doc ID 023768 Rev 2

27/73

to work with the integrated oscillator for textosc milliseconds and then the clock management

system switches to the OSCIN input.

Figure 12.

OSCIN and OSCOUT pin configuration

Note:

When OSCIN is UNUSED, it should be left floating.

When OSCOUT is UNUSED, it should be left floating.

6.9

Overcurrent detection

The L6482 measures the load current of each half-bridge sensing the VDS voltage of all the

Power MOSFETs (Figure 13). When any of the VDS voltages rise above the programmed

threshold, the OCD flag in the STATUS register is forced low until the event expires and a

GetStatus command is sent to the device (Section 9.1.21 and Section 9.2.20). The

overcurrent event expires when all the Power MOSFET VDS voltages fall below the

programmed threshold.

The overcurrent threshold can be programmed by the OCD_TH register in one of 32

available values ranging from 31.25 mV to 1 V with steps of 31.25 mV (Table 21,

Section 9.1.17).

UNUSED

OSCIN

OSCOUT

OSCIN

OSCOUT

OSCIN

OSCOUT

2/4/8/16 MHz

8/16/24/32 MHz

External oscillator

configuration

External clock source

configuration

Internal oscillator

configuration

with clock generation

OSCIN

OSCOUT

Internal oscillator

configuration

without clock source

UNUSED

OSC_SEL = "1xx"

OSC_SEL = "0xx"

EXT_CLK = "0"

EXT_CLK = "1"

AM15042v1

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