L9823(2003) データシートの表示（PDF） - STMicroelectronics

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L9823
(Rev.:2003)

Octal low-side driver for bulb, resistive and inductive loads with serial input control, output protection and diagnostic

STMicroelectronics 

L9823

PIN FUNCTION (continued)

N°

Pin

Description

14

Out 2 Output 2

15

SFPD 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. Essentially the SFPD pin determines whether the L9823 output(s) will

instantly shutdown upon sensing an output short or remain ON in a current limiting mode of

operation until the output short is removed or thermal shutdown is reached. If the SFPD pin is

tied to VDD the L9823 output(s) will remain ON in a current limited mode of operation upon

encountering a load short to supply. If the SFPD pin is grounded, a short circuit will immediately

shutdown only the output affected. Other outputs not having a fault condition will operate

normally.

16

VDD VDD

17

GND GND

18

GND GND

19

GND GND

20

GND GND

21

NC Not Connected

22

Reset Reset. The Reset pin is active low and used to clear the SPI shift register and in doing so sets all

output switches OFF. With the device in a system with an MCU; upon initial system power up,

the MCU holds the Reset pin of the device in a logic low state ensuring all outputs to be OFF

until the VDD pin voltages are adequate for predictable operation. After the L9823 is Reset, the

MCU is ready to assert system control with all output switches initially OFF. The Reset pin is

active low and has an internal pull-down incorporated to ensure operational predictability

should the external pull-down of the MCU open circuit. The internal pull-up is to afford safe and

easy interfacing to the MCU. The Reset pin of the L9823 should be pulled to a logic low state for

a duration of at least 160ns to ensure reliable Reset.

23

Out 1 Output 1

24

Out 0 Output 0

ABSOLUTE MAXIMUM RATINGS

For voltages and currents applied externally to the device. Exceeding limits may cause damage to the device.

Symbol

Parameter

Value

Unit

VDD

Supply voltage

-0.3 to 7

V

Inputs and data lines

(CSB, SCLK, SI, Reset, SFPD, SO)

VIN

Voltage

(CSB, SCLK, SI, Reset, SFPD)

-0.3 to 7

VSDO Voltage (SO)

-0.3 to VDD+0.3

V

IIN

Protection diodes current 1) T ≤ 1ms

-20 to 20 1)

mA

Outputs (Out0 ... Out7)

VOUT Cont Continuous output voltage

-1.5 to 45

V

3/12

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