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L9779WD bảng dữ liệu(PDF) 103 Page - STMicroelectronics

tên linh kiện L9779WD
Giải thích chi tiết về linh kiện  Multifunction IC for engine management system
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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L9779WD bảng dữ liệu(HTML) 103 Page - STMicroelectronics

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L9779WD
Functional description
169
Auto-adaptative time filter (fully adaptive mode)
This characteristic is useful to set the best internal filter time depending on the input signal
frequency.
Tfilter time depends on duration of the previous period Tn according to the following
formula:
Tfilter(n+1) = 1/32*Tn if Int_vrs > Tfilter(n)
The filtering time purpose is filtering very short spikes.
The digital filtering time is applied to internal squared signal (int_vrs), obtained by Voltage
comparators.
The output of time filtering block is out_vrs signal.
The filtering time Tfilter is applied to int_vrs signal in two different ways:
Rising edge: if int_vrs high level lasts less than Tfilter out_vrs is not set to high level
In absence of any spikes during input signal rising edge out_vrs signal is expected with
a delay of Tfilter time
Falling edge: the falling edge of int_vrs is not delayed through time filtering block: after
falling edge for a time Tfilter any other transition on int_vrs signal is ignored.
Tmaxfilter = 200 µs typ.
Tmin filter = 4 µs typ.
The default value after reset is Tmaxfilter.
The Tfilter function is reset by the enable of FLYING WHEEL function.
Figure 65. Auto-adaptive time filter (rising edge)



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