L9374LF datasheet(46/80 Pages) STMICROELECTRONICS

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Circuit description

L9374LF

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DocID025414 Rev 1

4.8.10

Sync-failure

Sync failure detects a timing error in the output command synchronization. The master

C

programs a timing window (STW, Section 4.3) where accessing to status address 0 is not

allowed. If there is an access to Status address 0 when the STW flag is set then a sync-

failure is generated (SYNC_F = 1). Also, a SYNC_F will be detected if there is no SPI traffic

at all between two SYNC_SIG events. This status will be read out on the subsequent SPI

transfer.

Without a SYNC_SIG or at sync-failure there is no effect for the actuation and setpoints

A sync-failure detection results in two consecutive error flags (SYNC_F = 1).

To re-synchronize the L9374LF a SYNC_TRIG signal must be sent.

4.8.11

Current not reachable failure (Q3 & Q4)

The Current Not Reachable failure is detected when the current controller control variable is

set to 1FF(Hex) or the current measurement sign_bit is set (‘1’) for more than tCURR_F (8ms

typ). Once a CNR is detected the CNRx bit for that output is set to ‘1’ and the ISAT value is

reset (see sections, 4.5.4, 4.6.1 and, 5.2.1).

The Current Not Reachable detection is used for outputs Q3 and Q4 only.

Table 36. Fault diagnostic summary

Failure

Output

state

Effect

Reset behavior

Openload

off

– bit is set (latched)

Access SPI-register

Undercurrent

– bit is set (filtered) see Section 4.8.1: Undercurrent /

openload

Access SPI-register

Overload

– bit is set (latched)

– output is switched off

– all set points / current / duty cycle / durations are kept at

zero

Access SPI-register

Over temperature

– bit is set (latched)

– output is switched off

– all set points / current / duty cycle / durations are kept at

zero

Access SPI-register

PGND-loss

on + off

– bit is set (latched)

– output is switched off

– all set points / current / duty cycle / durations are kept at

zero

Access SPI-register

SGND-loss

on + off

– No constraints at all functions

– SPI-communication has to be possible

– The SPI-bit SGND_L is set after the filter time

(tSGND_filt)

– All channels are switched off after tSGND_filt and all

current setpoints are deleted

– The sync-parameters are not cleared; sync-counter is

not reset

Access SPI-register

Dx-loss

– bit is set (latched)

Access SPI-register

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