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L9788 Datasheet(PDF) 92 Page - STMicroelectronics

Part # L9788
Description  Multifunction IC for automotive engine management system
PDF  264 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9788 Datasheet(HTML) 92 Page - STMicroelectronics

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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
Pin
VIH_TX
HIGH_level input voltage -
1.75
-
-
V
INJ_ENA
VIL_TX
LOW_level input voltage
-
-
-
0.75
V
INJ_ENA
VHYS_TX
Input voltage hysteresis
-
0.1
0.5
-
V
INJ_ENA
PDOWN_TX
Pull-down resistance
-
50
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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