Valve Driver 36-Pin PowerSO T/R

The L9375 is a eight channel low side driver with integrated recirculation diodes for PWM controlled channels 5 to 8. 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 provide a sync signal for the channel activation.The output duty cycle for each PWM controlled 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 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.The channels 1 to 4 are configured as switching channels. To achieve a fast switch off a high voltage output clamp is implemented for a rapid free-wheeling if the inductive load. The switch on time can be programmed via SPI.All channels are equipped with a load diagnostic. This allows to detect an open load in off condition as well as a under current in on condition. The power stage is protected against over current and over temperature. A weak connection in power ground, in the recirculation path or in the external clock is monitored and leads to a switch off of the power stages in case an error occurs. All monitored functions can be read out in a serial diagnostic protocol dedicated for each channel via SPI.

• Octal low-side output drivers with protection diagnostic
  • 4 x 3A, 160 mO typ.
  • 4 x 3A, 200 mO typ.
• Programmable channel timer
• Clock monitor
• 4 channels with Integrated recirculation diodes
• 4 channels with 40 V clamp for fast free wheeling of inductive loads.
• Serial peripheral interface with 16 bits, up to 5 MHz with diagnosis
• Battery compatible supply voltage
• Detailed Load diagnosis
  • Over load protection
  • Open load
  • Undercurrent
  • Undervoltage
  • Temperature warning and shutdown
  • Power or signal GND loss
  • Freewheeling diode loss