L9781TR STMicroelectronics

L9781 Data brief Automotive multiple valve pre-driver for diesel and gasoline direct injection Features AEC-Q100 qualified 1 x DC/DC converter controller for VTank voltage generation (up to 80 V): 1 x low-side push-pull type N-channel MOSFET pre-driver LQFP64 1 x current sensing block for current limitation 1 x voltage comparator with hysteresis for VTank voltage sensing GADG3108180823PS 2 x driving channel controllers each made up of: 1 x high-side push-pull type VTank N-channel MOSFET pre-driver 1 x high-side push-pull type VBat N-channel MOSFET pre-driver 2 x low-side push-pull type N-channel MOSFET pre-driver 1 x differential amplifier with programmable gain for current sensing & peak current detection 1 x digital-to-analog converter for peak current threshold setting 1 x HW protection and diagnosis block for full load protection from accidental external short circuits 1 x additional peak and hold controller: 1 x high-side push-pull type VBat N-channel MOSFET pre-driver 1 x low-side push-pull type N-channel MOSFET pre-driver 1 x differential amplifier with programmable gain for current sensing and peak current detection Product status link 1 x digital-to-analog converter for peak current threshold setting L9781 1 x HW protection and diagnosis block for full load protection from accidental external short circuits Product summary 1 x 32 bit SPI interface (up to 8 MHz) Order code Package Packing IC general control L9781 Tray Programmable parameters setting LQFP64 Tape and (10x10 mm) Diagnosis and hardware protection management L9781TR reel Description The L9781 is a multi valve pre-driver capable of driving 11 external N-channel logic level MOSFETs, controlling up to 5 inductive loads through peak and hold current control and one DC/DC step-up converter, providing full protection against accidental faults on the external hardware. The load peak and hold current control (together with the diagnosis) is done by the internal configurable Finite State Machines (FSMs) needing only the start of actuation commands from the main microcontroller. DB3720 - Rev 1 - September 2018 www.st.com For further information contact your local STMicroelectronics sales office.L9781 Pin description 1 Pin description Figure 1. Pin connection (top view) 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 GND A 1 CLK EXT 48 DAOUT P 2 47 VCCI DAOUT B 3 46 DOUT DAOUT A 4 45 DIN 5 TM1 44 CS GND P 6 43 SCK VBAT 7 42 IRQ 8 VTANK 41 CHS P LQFP64 9 GLS T 40 HPPH RSN T 39 GHS P 10 RSP T 38 11 HPPL 12 VT FB 37 GLS P 13 CHS A 36 CHS B 14 GHST A 35 GHST B 34 RSPHS A 15 RSPHS B GHSB A 16 33 GHSB B 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 GAPGPS00335 Table 1. Pins function Pin Name Function Type Note 1 GND A Analog ground connection Supply - 2 DAOUT P Fuel pump current feedback output Analog OUT - 3 DAOUT B Bank B current feedback output Analog OUT - 4 DAOUT A Bank A current feedback output Analog OUT - Internal pull-down Force 5 TM1 Test mode Digital IN to GND 6 GND P Power ground connection Supply - 7 VBAT Direct Vbat power supply Supply - 8 VTANK VTank power supply Supply - Pre-driver output for DC/DC converter power N-channel 9 GLS T Analog OUT - MOSFET DC/DC converter negative reference for current sensing 10 RSN T Analog IN - amplifier DB3720 - Rev 1 page 2/10 INJH A REXT INJL Ax ENB GLS Ax CMD C INJL Ay TM6 GLS Ay VCCD RSN A RST RSP A V33 RSN P GND D RSP P SEL A RSP B CMD A RSN B TM5 GLS By TM4 INJL By SEL B GLS Bx CMD B INJL Bx TM3 INJH B TM2