Datasheet

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This is information on a product in full production.

September 2013 DocID7791 Rev 7 1/19

L9823

Octal low-side driver for bulb, resistive and inductive loads with

serial input control, output protection and diagnostic

Datasheet - production data

Features

 Outputs current capability up to 0.5 A

 Cascadable SPI control for outputs

 Reset function with reset signal or

undervoltage at V

 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 µA @ VDD)

 Open load detection (outputs off)

 Single V

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.

'!0'03

SO24

Table 1. Device summary

Order code Package Packing

L9823 SO24 Tube

E-L9823 SO24 Tube

www.st.com

Summary of content (19 pages)

PAGE 1
L9823 Octal low-side driver for bulb, resistive and inductive loads with serial input control, output protection and diagnostic Datasheet - production data  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.
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Contents L9823 Contents 1 2 3 Block diagram and pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.2 Pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.1 Absolute maximum ratings . . . . . . . . . .
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L9823 List of tables List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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List of figures L9823 List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. 4/19 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pins connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Output control register structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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L9823 Block diagram and pins description 1 Block diagram and pins description 1.1 Block diagram Figure 1.
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Block diagram and pins description L9823 Table 2. Pins description N# Pin 1 OUT7 Output 7 2 OUT6 Output 6 SCLK The system clock pin (SCLK) clocks the internal shift registers of the L9823. The serial input pin (SI) accepts data into the input shift register on the falling edge of the SCLK signal while the serial output pin (SO) shifts data information out of the shift register on the rising edge of the SCLK signal.
PAGE 7
L9823 Block diagram and pins description Table 2. Pins description (continued) N# Pin Description 14 OUT2 Output 2 15 SFPD The Short Fault Protect Disable (SFPD) pin is used to disable the overcurrent latch-OFF. This feature allows control of incandescent loads where in-rush currents exceed the device's analog current limits.
PAGE 8
Electrical specifications L9823 2 Electrical specifications 2.1 Absolute maximum ratings For voltages and currents applied externally to the device. Exceeding limits may cause damage to the device. Table 3. Absolute maximum ratings Symbol VDD Parameter Supply voltage Value Unit -0.3 to 7 V Inputs and data lines (CSB, SCLK, SI, Reset, SFPD, SO) VIN VSDO IIN Voltage (CSB, SCLK, SI, Reset, SFPD) Voltage (SO) -0.3 to 7 -0.3 to VDD+0.
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L9823 2.3 Electrical specifications Electrical characteristics 4.5 V  VDD  5.5 V; -40 °C  TJ  150 °C; unless otherwise specified. Table 5. Electrical characteristics Symbol Parameter Test condition Min. Typ. Max. Unit Supply voltage Standby current leakage current Reset = LOW and / or VDDRES>VDD > 0.5V VDD < 0.5V - 35 <1 70 10 µA IDDOPM Operating mode IOUT0 to 7 = 500 mA SPI - SCLK = 3 MHz CSB = Low SO no load - - 6 mA IDD rev IDD during reverse output current Iout rev = -2.
PAGE 10
Electrical specifications L9823 Table 5. Electrical characteristics (continued) Symbol Min. Typ. Max. Unit - - 300 pF SFPD = Low, VOUT  VDG 0.5 1.6 2.5 A IOUT LIM Short circuit current limitation - 0.5 1.6 2.5 A tdly SCB SFPD = Low, VOUT  VDG CSB = 50% to IOUT  1/2 IOUT LIM 70 150 250 µs 0.5·VDD 0.55·VDD 0.
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L9823 Electrical specifications Table 5. Electrical characteristics (continued) Symbol Parameter Test condition Min. Typ. Max. Unit - - 20 ns thcld SI input hold time SI data hold after SCLK change H/L tsclcl SCLK low before CSB high - 150 - - ns thclch SCLK high after CSB high - 15, - - ns tpchdz CSB L/H to output data float - - - 100 ns tReset Minimum Reset time Reset = Low - - - 160 ns Table 6.
PAGE 12
Electrical specifications 2.4 L9823 Power outputs characteristics for flyback current, outputs short circuit protection and diagnostics For output currents flowing into the circuit the output voltages are limited. The typical value of this voltage is 50V. This function allows that the flyback current of a inductive load recirculates into the circuit; the flyback energy is absorbed in the chip.
PAGE 13
L9823 Functional description 3 Functional description 3.1 General The L9823 integrated circuit features 8 power low-side-driver outputs. Data is transmitted to the device using the Serial Peripheral Interface = SPI protocol. The power outputs features voltage clamping function for flyback current recirculation and are protected against short circuit to Vbat.
PAGE 14
Functional description 3.3 L9823 Diagnostics The output voltage at all outputs is compared with the diagnostic threshold, typ 0,55  VDD = VDG. Table 7.
PAGE 15
L9823 Functional description Figure 6.
PAGE 16
Applications information 4 L9823 Applications information The typical application diagram for parallel Input SPI control is shown in Figure 7. Figure 7. Typical application circuit diagram for the L9823 circuit.
PAGE 17
L9823 5 Package information Package information In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. Figure 8. SO24 mechanical data and package dimensions MM INCH $)- -). 490 -!8 -).
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Revision history 6 L9823 Revision history Table 8. Document revision history 18/19 Date Revision Changes 16-Apr-2003 4 Initial release. 13-Apr-2011 5 Document reformatted. Added new order code in Table 1: Device summary on page 1. 17-Jun-2013 6 Updated: Figure 3: Output control register structure on page 11 and Figure 6: Structure of the outputs status register on page 15. 19-Sep-2013 7 Updated Disclaimer.
PAGE 19
L9823 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale.