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September 2013 Doc ID 7214 Rev 10 1/19

L9826

Octal protected low-side driver with diagnostic

and serial/parallel input control

Features

■ 8 channels low side driver with 450 mA output

current capability

■ Typical R

DSON

1.5  at T

= 25 °C

■ Parallel control for output 1 and 2

■ SPI control on all outputs

■ Reset function

■ Diagnostic through 8 bit SPI

■ Intrinsic output voltage clamping 50 V (Typ)

protection for inductive load drive

■ Short circuit current limitation and thermal

shutdown for outputs 1 and 2

■ Overcurrent and short circuit shutdown for

outputs 3 to 8

Description

The L9826 is a protected octal low-side driver IC

designed for the automotive environment.

The 8 -bit serial peripheral interface (SPI) is able

to control the device's eight channels and to

provide its load's diagnosis. In addition output 1

and 2 can also be controlled through dedicated

input pins NON1 and NON2.

Overcurrent and short-circuit protections are

present as well as the output voltage clamping

which is able to protect the L9826 during

operation with inductive loads.

SO20

'!0'03

Table 1. Device summary

Order code Package Packing

L9826 SO20 Tube

L9826TR SO20 Tape and reel

E-L9826 SO20 Tube

E-L9826TR SO20 Tape and reel

www.st.com

Summary of content (19 pages)

PAGE 1
L9826 Octal protected low-side driver with diagnostic and serial/parallel input control Features ■ 8 channels low side driver with 450 mA output current capability ■ Typical RDSON 1.
PAGE 2
Contents L9826 Contents 1 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.2 Thermal data . . . . . . . . . . . . . . . .
PAGE 3
L9826 List of tables List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Absolute maximum ratings for voltages and currents applied externally to the device. . . . .
PAGE 4
List of figures L9826 List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. 4/19 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Connection diagram (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Typical application circuit diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE 5
L9826 Block Diagram Figure 1.Block diagram 6## 6## ./. /54 3 )/, ,ATCH $RIVER 1 2 /VERTEMPERATURE $ETECTION &AULT ,ATCH $IAG 6$' #( ./. 6## #,+ 6## 3$) #( /UTPUT ,ATCH .#3 1 $IAG 30) )NTERFACE 6## 3HIFT 2EGISTER 1 Block Diagram 6## 3$/ /54 1 1 1 1 1 1 1 1 6## 2ESET 1 3 ,ATCH $RIVER $IAG $IAG $IAG $IAG $IAG 1 $IAG $IAG $IAG $IAG 1 $IAG $IAG '.$ .
PAGE 6
Pins description 2 L9826 Pins description Figure 2. Connection diagram (top view) /54 /54 /54 /54 N2%3 6CC .#3 ./. '.$ '.$ '.$ '.$ ./. #,+ 3$/ 3$) /54 /54 /54 /54 '!0'03 Table 2.
PAGE 7
L9826 Electrical specifications 3 Electrical specifications 3.1 Absolute maximum ratings Table 3. Absolute maximum ratings for voltages and currents applied externally to the device Symbol VCC Parameter Test condition Supply voltage Min. Typ. Max. Unit -0.3 - 7 V -0.3 - 7 V T  1ms -20 - 20 mA - -0.7 - 45 V - -2 - 1.
PAGE 8
Electrical specifications 3.3 L9826 Electrical characteristics Refer to 4.5 V  VCC  5.5 V; -40 °C  TJ 150 °C; unless otherwise specified. Table 6. Electrical characteristics Symbol Parameter Test condition Min. Typ. Max. Unit Supply voltage IccSTB IccOPM ICC Standby current without load (nRes = Low) - - 70 A Operating mode IOUT1 ...
PAGE 9
L9826 Electrical specifications Table 6. Electrical characteristics (continued) Symbol Parameter Test condition Min. Typ. Max. Unit Output clamp voltage 1 mA  Iclp  Ioutp; Itest = 10 mA with correlation 45 - 62 V RDSon On resistance OUT 1 ... 8 IOUT = 250 mA; Tj = +150 °C - - 3.0  COUT Output capacitance VOUT = 16 V; f = 1 MHz guaranteed by design - - 300 pF Vclp Outputs short circuit protection ISBC Overcurrent shutoff threshold OUT3 ... OUT8 0.45 - 1.
PAGE 10
Electrical specifications Table 6. Symbol L9826 Electrical characteristics (continued) Parameter Test condition Min. Typ. Max.
PAGE 11
L9826 Application information 4 Application information The typical application diagram is shown in Figure 3. Figure 3. Typical application circuit diagram 6## 6/,4!'% 2%'5,!4/2 6"!4 6## /54 6## ./. 3 )/, ,ATCH $RIVER 1 2 /VERTEMPERATURE $ETECTION &AULT ,ATCH $IAG 6$' #( ./.
PAGE 12
Functional description L9826 5 Functional description 5.1 General The L9826 is an 8-channel low-side driver assembled in SO20 package. Its 8-bit SPI serial interface is designed to control all the outputs and to provide their diagnosis. Channels 1 and 2 are controlled either via SPI or via parallel through the inputs pins NON1 and NON2. Diagnostic recognizes operative fault conditions: open load, short circuits to GND or to VB and overcurrent.
PAGE 13
L9826 5.2.2 Functional description Via 8-bit SPI for all the outputs Control data are transmitted to SDI through a microcontroller in configuration master. The device is selected when NCS signal is low. The 8-bit command data are transmitted into L9826 shift registers every CLK falling edge (see Figure 6 for SPI signals timing). The NCS rising edge latches the new data from the shift register to the driver and the output are driven following the commands just sent.
PAGE 14
Functional description 5.3 L9826 Output stage diagnostics All the outputs voltage are compared with the diagnostic threshold (0.38 Typ · VCC) and this information is transferred in dedicated fault latches which are cleared when the NCS reaches the state low. Afterward the latch stores the status bit and the first reading after the error might be wrong. The second one is considered right. The next Figure 7 and 8 show the diagnostic bits read out on SDO and their organization into the dedicated registers.
PAGE 15
L9826 5.3.1 Functional description Diagnostic on Outputs 1 and 2 controlled via NON1/NON2 Fault condition (1) "output shorted to Vbat" The output has been previously switched-on and its voltage exceeds the diagnostics threshold. It operates in current regulation mode or it is switched-off if thermal shutdown threshold (TJSC) is reached. The status bit is low.
PAGE 16
Functional description 5.4 Protections 5.4.1 Flyback current L9826 Turning off the low side driver with an inductive load, its output voltage rises due to the inductor that tries to drive current. This voltage is internally clamped by the flyback circuit at VCPL value, typical 50V 5.4.2 Current regulation mode outputs 1 and 2 Outputs 1 and 2 which are particularly dedicated for loads with inrush current (as lamps).
PAGE 17
L9826 6 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 9. SO20 mechanical data and package dimensions MM INCH $)- -). 490 -!8 -).
PAGE 18
Revision history 7 L9826 Revision history Table 10. 18/19 Document revision history Date Revision Changes 22-Apr-2004 7 Initial release in EDOCS 26-Jul-2005 8 Document reformatted. Modify value RON in the “Features”. 08-Feb-2011 9 Updated Features and Description on page 1. Updated Table 1: Device summary on page 1. Updated Figure 3: Typical application circuit diagram. Reworked the content of the Section 5: Functional description. 19-Sep-2013 10 Updated Disclaimer.
PAGE 19
L9826 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.