L9908 datasheet(97/152 Pages) STMICROELECTRONICS

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Figure 72. OND blanking and filtering (VDS_LSn example), single fault

Where:

1. LSn gate drive rising edge → T_ond_blank is elapsed comparator output masking is released; VSLn-VSHn >

VDS_ond_th → LSn_STB comparator output is set to 1;T_ond_flt counter +1; LSn gate drive falling edge →

comparator output masking is enabled → T_ond_flt counter freeze.

2. LSn gate drive rising edge → T_ond_blank is elapsed comparator output masking is released; VSLn-VSHn <

VDS_ond_th → LSn_STB comparator output is set to 0; T_ond_flt counter -1; LSn gate drive falling edge →

comparator output masking is enabled → T_ond_flt counter freeze.

The correct operation OND stage is safety relevant and then a self-check procedure is implemented.

Table 91. OND electrical characteristics

Symbol

Parameter

Test Condition

Min Typ Max Unit

Notes

OND_th_lsb

VDS monitoring threshold step

mV Not subject to production test

OND_th_acc1

VDS monitoring thresholds

accuracy 1

0.594 V < VDH

SHS_n < 1.7 V

0.594 V < SHS_n-

SLS_n < 1.7 V

-4.5

4.5

16x < VDS_HS/LH_TH < 3Fx

OND_th_acc2

VDS monitoring thresholds

accuracy 2

0.324 V < VDH-

SHS_n < 0.594 V

0.324 V < SHS_n-

SLS_n < 0.594 V

-6

Cx < VDS_HS/LH_TH < 16x

OND_th_acc3

VDS monitoring thresholds

accuracy 3

0.162 V < VDH-

SHS_n < 0.324 V

0.162 V < SHS_n-

SLS_n < 0.324 V

-10

6x < VDS_HS/LH_TH < Cx

OND_th_acc4

VDS monitoring thresholds

accuracy 4

0.081 V < VDH-

SHS_n < 0.162 V

0.081 V < SHS_n-

SLS_n < 0.162 V

-15

4x < VDS_HS/LH_TH < 6x

L9908

Functional description

DS13546 - Rev 5

page 97/152

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