L9969X datasheet(39/70 Pages) STMICROELECTRONICS

39 / 70 page

Table 24. OFF state diagnostic detection parameters

Symbol

Parameter

Condition

Min Typ Max Unit

VOFF_OUT1

OUT1 regulated output voltage, used for OFF

diagnostics

-2.4 mA < IOUT1 < 2.9

1.2

1.8

2.4

OUTx1

IOFF_PD_OUT2

OUT2 pulldown current, used for OFF

diagnostics

VOUT2 = 1.6 V

120 150

µA

OUTx2

IOFF_OL_TH

Open-load threshold used for OFF diagnostics,

measured at OUT1

-80 -60

-30

µA

OUTx1

IOFF_SCB_TH

Short to battery threshold used for OFF

diagnostics, measured at OUT1

250 380 500

µA

OUTx1

IOFF_SCG_TH

Short to ground threshold used for OFF

diagnostics, measured at OUT1

-2.3

-2

-1.3

mA OUTx1

IOFF_LIM_SRC_OUT1

OFF diagnostic regulator sourcing current limit,

measured at OUT1

VOUT1 = 0 V

-5.7 -4.1 -2.4

mA OUTx1

IOFF_LIM_SNK_OUT1

OFF diagnostic regulator sinking current limit,

measured at OUT1

2.5 V < VOUT1 < 18 V

2.9

4.1

5.4

mA OUTx1

ROL

Load detection threshold

2.5

kΩ

tdiag_OL

Delay before enabling Open Load diagnostic

structure

100

150

tdiag_OL_1

Delay before starting measurement

2.4

3.6

tdiag_OL_2

Open Load diagnostic filtering time

200

300

µs

Figure 26. Timings related to Open Load diagnostics

DIS

disable

bridge

Start

measurement

T diag _OL

Tdiag _OL 1

Failure

Tdiag _OL 2

Failure

detected

U OUT 1

U BIAS

Switch-on

current source

This means, the open load diagnosis starts automatically after t_diag_OL + t_diag_OL_1. If now there is no open load

condition, the diagnosis phase keeps on running. If the open load condition is detected, this condition must be

valid for a time t_diag_OL_2. If this is the case, OL is reported to the DIA_REG1. The OL structure keeps on

working, so that if the OL disappears and reappears after a certain time, it is detected again, automatically and

without any external trigger.

L9969x

Functional description

DS14029 - Rev 6

page 39/70

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