L9788 datasheet(59/264 Pages) STMICROELECTRONICS

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DS12308 Rev 4

59/264

L9788

Main relay driver (low-side driver)

263

5.2

OFF state diagnostic

The OFF diagnosis is performed only in the supply scheme with battery permanently

connected.

The off diagnosis is the same as other low-side drivers.

There is a bit Ipupd_EN which is controlled by a MSC bit (CONFIG_REG2 D6), it is used by

external µController if it is needed to switch on/off both pull up and pull down diagnosis

current.

There is a bit Ipupd_MODE which is controlled by a MSC bit(CONFIG_REG2 D7), it is used

by external uController if it is needed to switch on/off the bigger diagnosis current

(I_LS_PU1) in fast mode. It is possible to define the maximum number of retry in case of

OVC after wake up by KEY. It can be done setting KEY_OC_RETRY_MAX_EN bit in

CONFIG-REG 20.

Conditions:

5.5 V ≤ VB_IN ≤ 18 V, Tj -40 to 175 °C unless otherwise specified;

Table 26. Main relay low-side driver electrical characteristics

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

Main relay

MRD_out_voltage_low

Low-side out

voltage

VB_IN = 3.9 V



Iload = 0.1 A

0.9

MRD

MRD_out_voltage_nom

Low-side out

voltage

5.5 V < VB_IN < 18 V

Iload = 0.3 A

1.35

MRD

MRD_lkg

Output leakage

current

Output disabled,

diagnostic off

-10

+10

µA

MRD

rev_MRD

Reverse battery

-16

MRD

I_load

Output current

Application Info

0.5

MRD

SR_ON_20

Voltage slew ON

State

From 80% to 30% of

VOUT VB_IN = 14 V,

Rload = 20 Ω

Cload = 10 nF

V/µs MRD

SR_OFF_20

Voltage slew OFF

State

From 30% to 80% of

VOUT VB_IN = 14 V,

Rload = 20 Ω

Cload = 10 nF

V/µs MRD

Ton_MRD_20

Propagation

Delay from

Chip_EN rising

edge to 80%

output MRD

voltage

VB_IN = 14 V,



Rload = 20 Ω

Cload = 10 nF

µs

MRD

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