L9374 Datasheet, PDF (1/10 Pages) STMicroelectronics – Four channel valve driver

L9374
Features
■ Four low-side output drivers with protection
diagnostic
– 2 PWM controlled channels (0.2Ω typ)
– 2 current controlled channels with 6%
accuracy (0.3Ω typ)
■ All outputs with 35V Zener clamp
■ Programmable channel timer
■ Clock monitor
■ Integrated recirculation diodes
■ Serial Peripheral Interface with 16bits, up to
5MHz with diagnosis
■ Battery compatible supply voltage
■ Detailed Load diagnosis
– Over load protection
– Open Load
– Under-current
– Under Voltage
– Temperature Warning and Shutdown
– Power or Signal GND loss
– Freewheeling diode loss
– Silent valve driver test
Description
The L9374 is a four channel low side driver with
integrated recirculation diodes. The switching of
the channels is programmable via a SPI (Serial
Peripheral Interface). The main time base is given
by an external clock via CLKin. The Clock Unit
monitors this external clock and provides the
system clock for all timings.
A Synchronization Unit is used to monitor the SPI
communication and provides a sync signal for the
channel activation.
The Output Duty Cycle for each channel can be
programmed individually and will be activated by
the Set Point Unit. Is possible to program two
output Duty Cycles per channel with a block of 16
SPI commands as well as an individual Duration
Time for each channel actuation. Both information
Four channel valve driver
Data Brief
PowerSO-36
PowerSSO-36
are stored in the PWM and in the Counter
Configuration Register respectively.
The PWM Controller translates the programmed
digital duty cycle value in a PWM signal which
controls the output.
For the current controlled channels the target
current value is programmed. It is also possible to
program two different target currents. The target
current is compared with the real load current.
The output duty cycle is then calculated with an
Arithmetic Logic Unit. As base for the calculation
a load model is used respecting the resistivity of
the load, the supply voltage as well as the
internal recirculation path. To check the
plausibility of the current controller all measured
and calculated values are available and
accessible via SPI.
All channels are equipped with a load Diagnostic.
This allows to detect an open load in off condition
as well as an under current in on condition. The
power stage is protected against over current and
over temperature. A weak connection in power
ground or in the recirculation path is monitored.
All monitored functions can be read out in a serial
diagnostic protocol dedicated for each channel
via SPI..
Table 1. Device summary
Order code
Package
Packing
L9374
L9374XP
PowerSO-36 (slug down)
PowerSSO-36 (exp. pad)
Tube
Tube
July 2007
Rev 2
For further information contact your local STMicroelectronics sales office.
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