L9788 datasheet(92/264 Pages) STMICROELECTRONICS

92 / 264 page

Low-side drivers

L9788

92/264

DS12308 Rev 4

7.2.1

Enable pin INJ_ENA

The Pin INJ_ENA is a digital input pin that is used as enable of Injector driver. If this pin is at

low digital level the internal logic drives all injector drivers in OFF state. If this pin is at high

digital, all injector drivers can be switched on by dedicated MSC bit. This pin can be used

also as a SEO function for injector driver. If the application doesn't use this enable function,

the INJ_ENA pin have to be pulled up externally to VDD5 by a resistor of 10 kΩ.

Conditions:

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

7.3

Low-side driver - O2 HEATER O2H[1:2]

These 2 LowSide drivers are designed to driver O2 heater Load. They are driven by MSC

command. The Output voltage is clamped to voltage limit by internal clamp circuit. O2

channel can be configured as valve driver with faster slew rate and lower over current

threshold by MSC commands. Current sense generates on Curr_sense_O2H pin a reduced

copy of the current flowing through O2H Power. Current sense current generator is done

with a P-channel current mirror connected to VDD5_IN, for this reason voltage on

Curr_sense_O2H1 and Curr_sense_O2H2 pins can never exceed VDD5_IN.

Figure 35. O2 heater LowSide driver stage

Table 45. INJ_ENA electrical characteristics

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

VIH_TX

HIGH_level input voltage -

1.75

INJ_ENA

VIL_TX

LOW_level input voltage

0.75

INJ_ENA

VHYS_TX

Input voltage hysteresis

0.1

0.5

INJ_ENA

PDOWN_TX

Pull-down resistance

100

200

kΩ

INJ_ENA

PGND

OUTx

O2H DRIVER

O2 heater

MSC Command

OFF state

OL & STG detection

Driver

ON state

OC & OT protection

Safety BIST control

VBAT

L/R

GADG0112161309PS

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