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L9966 bảng dữ liệu(PDF) 8 Page - STMicroelectronics

tên linh kiện L9966
Giải thích chi tiết về linh kiện  FlexInput IC for automotive applications
PDF  122 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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L9966 bảng dữ liệu(HTML) 8 Page - STMicroelectronics

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4
Input structure
The L9966 hosts 15 different input channels. These channels can be connected to different types of external
loads, such as switches, sensors or resistors.
The input structure allows down to -3 V negative input voltage:
•
to withstand ground shifts between the ECU ground and the chassis ground where the input signal source is
referenced to
•
limited to the SENT inputs, to withstand the RF noise without clamping effect that could distort the input
signal.
The input structure allows down to -30 V transient on the SENT IO[4:1] pins only if UBSW is no greater than
24 V max. The input protection uses a DPI (Direct Power Injection) filter to avoid rectifying effects in case of HF
disturbance on the line.
On the ECU, the input line must be equipped with a discrete ESD capacitor. The value of this capacitor is 6.8 nF.
Exceptions to this are the SENT inputs (IO1/2/3/4 pins), because the SAE SENT standard allows max. 100 pF,
with an additional 2.2 nF / 560 Ω RC combination. Therefore, SENT inputs have to be additionally protected by
TVS (Transient Voltage Suppressor) on the ECU, if necessary.
L9966
Input structure
DS12459 - Rev 10
page 8/122



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