april 2011 doc id 7791 rev 5 1/19 1 l9823 octal low-side driver for bulb, resistive and inductive loads with serial input control, output protection and diagnostic features outputs current capability up to 0.5 a cascadable spi control for outputs reset function with reset signal or undervoltage at v dd programmable intrinsic output voltage clamping at typ. 50 v for inductive switching overcurrent shutdown with latch-off for every write cycle (sfpd = low) independent thermal shutdown of outputs (soa protection) output status data available on the spi using 8-bit i/o protocol up to 3.0 mhz low standby current with reset = low (typ. 35 a @ vdd) open load detection (outputs off) single v dd logic supply high ems immunity and low eme (controlled output slopes) full functionality of the remaining device at negative voltage drop on outputs (-1.5 v or -3.0 a) output mode programmable for sustained current limit or shutdown description l9823 is a octal low-side driver circuit, dedicated for automotive applications. output voltage clamping is provided for flyback current recirculation, when inductive loads are driven. chip select and cascadable serial 8-bit interface for outputs control and diagnostic data transfer. ' ! 0 ' 0 3 so24 table 1. device summary order code package packing l9823 so24 tube E-L9823 so24 tube www.st.com
contents l9823 2/19 doc id 7791 rev 5 contents 1 block diagram and pins descripti on . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.1 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.2 pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.2 thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.3 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.4 power outputs characteristics for flyback current, outputs short circuit protection and diagnostics 12 3 functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.1 general . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.2 output stages control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.3 diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4 applications information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 5 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 6 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
l9823 list of tables doc id 7791 rev 5 3/19 list of tables table 1. device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 table 2. pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 table 3. absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 table 4. thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 table 5. electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 table 6. outputs control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 table 7. diagnostic for outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 table 8. document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
list of figures l9823 4/19 doc id 7791 rev 5 list of figures figure 1. block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 figure 2. pins connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 figure 3. output control register structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 figure 4. timing of the serial interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 figure 5. pulse diagram to read the outputs status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 figure 6. structure of the outputs status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 figure 7. typical application circuit diagram for the l9823 circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . 16 figure 8. so24 mechanical data and package dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
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