3/12

L9823

ABSOLUTE MAXIMUM RATINGS

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

.

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

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

Symbol

Parameter

Value

Unit

Supply voltage

-0.3 to 7

V

Inputs and data lines

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

Voltage

(CSB, SCLK, SI, Reset, SFPD)

-0.3 to 7

Voltage (SO)

V

≤ 1ms

mA

Outputs (Out0 ... Out7)

Continuous output voltage

-1.5 to 45

V

N°

Pin

Description

PIN FUNCTION (continued)