STA382BWSTR datasheet(91/172 Pages) STMICROELECTRONICS

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STA382BWS

Doc ID 022784 Rev 1

91/172

Figure 26.

Short-circuit detection timing diagram (no short detected)

In Figure 26 the short protection timing diagram is shown. The time information is expressed

in clock cycles, where the clock frequency is defined as in section Section 6.13.1: Master

clock select. The gray color is used for the short status bits to indicate that the bits are

carrying the status of the previous EAPD 0->1 toggling (to be noted that after reset this state

is meaningless since no EAPD transition occurs). The GND-related SHOK bits are updated

as soon as the gnd test is completed, the VCC bits are updated after vcc test is completed,

and the SOUT bit is updated after the shorted output test is completed. The gnd test, vcc

test and output test, are always run (if the SHEN bit is active and EAPD toggled to ‘1’), and

only if both tests are successful (no short) do the bridge outputs leave the tristate (indicated

by dotted lines in the figure). If one of the three tests (or all) fail, the power bridge outputs

are kept in the tristate until the procedure is restarted with a new EAPD toggling.

In this figure EAPD is intended to be bit 7 of register 0x05.

6.29

Extended coefficient range up to -4...4 (address 0x5A)

Biquads from 1 to 7 have in the STA382BWS the possibility to extend the coefficient range

from [-1,1) to [-4..4) which allows the use of high-shelf filters that may require a coefficient

dynamic greater in absolute value than 1.

Three ranges are available, [-1;1) [-2;2) [-4;4). By default, the extended range is activated.

Each biquad has its independent setting according to the following table.

EAPD

OUT1A

OUT1B

OUT2A

OUT2B

GNDSH]

VCCSH

OUTSH]

cycles

50005 cycles

1cycle

Start out test

TBD cycles

CEXT_B4[1]

CEXT_B4[0]

CEXT_B3[1]

CEXT_B3[0]

CEXT_B2[1]

CEXT_B2[0]

CEXT_B1[1]

CEXT_B1[0]

reserved

CEXT_B7[1]

CEXT_B7[0]

CEXT_B6[1]

CEXT_B6[0]

CEXT_B51]

CEXT_B5[0]

Obsolete

Product(s)

- Obsolete

Product(s)

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