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E-L9823 View Datasheet(PDF) - STMicroelectronics

Part Name
Description
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E-L9823 Datasheet PDF : 19 Pages
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L9823
Block diagram and pins description
Table 2. Pins description (continued)
N#
Pin
Description
14
OUT2 Output 2
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
15
SFPD 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
N.C. Not Connected
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,
22
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
OUT1 Output 1
24
OUT0 Output 0
DocID7791 Rev 7
7/19
18
 

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