L9960 datasheet(72/95 Pages) STMICROELECTRONICS

72 / 95 page

Functional description

L9960, L9960T

72/95

DS11115 Rev 10

When the TRIG command is set, the current sources needed to run the OFF state diagnosis

are turned-on. A delay is implemented to complete the settling of the current sources

(Tdiag_del).

Additionally, a filtering of the diagnosis is done. This filter time is Tstable_off and if the

diagnosis input is stable during Tstable_off, the diag is performed and the failure is latched.

If the diagnosis input is switching during Tstable_off, the diag is not performed and the filter

time is re-triggered on each edge of the diagnosis input.

A time-out (Ttimeout) is implemented in parallel to Tstable_off in order to filter out too long

and unstable input.

Here below the OpenLoad in Offstate diagram, showing two application cases.

Figure 32. Open load off state diagnosis diagram

The Off-state diagnostic table is reported as follows:

Off-state diagnostic principle

Note:

(-) available in the R2/R1/R0 bit position in SPI answer frame 9.

1. N o r m al o p er at i o n , n o f ai l u r e

2. S t ead y S t at e O p en L o ad f ai l u r e

Diag done / no failure

no diag done / diag sequence on-going

Open Load / Diag Done

tristate

tHZ

no failure

tristate

tHZ

no diag triggered / tHZ not expired

tDIAG_DEL

tstable

O_off_diag_en

( based on SPI request)

O_off_diag_en

( based on SPI request)

i_ol_off or i_sgnd_off or i_scb_off

i_ol_off

Open Load / Diag done

GAPGPS02362

Table 85. DIAG_OFF[2:0]

Bits status

Description

Priority

Condition

000

Not used

001

Open Load / Diag done

6(Highest)

010

Short circuit to BAT

011

Short circuit to GND

100

No failure / Diag done

101

No Diag triggered / incorrect state (active state or vps_uv

state)

110

No Diag triggered / Thz not expired

111

No Diag done / Diag sequence (tdiag_del + tstable) on

going

0 (Lowest) Default value

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