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L9177 데이터시트(PDF) 30 Page - STMicroelectronics

부품명 L9177
상세설명  Peripheral on chip for low end engine control
PDF  49 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9177 데이터시트(HTML) 30 Page - STMicroelectronics

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Functional description
L9177
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DocID17617 Rev 1
Figure 19. Power-up sequence
Figure 20. Power-down sequence
Reset signal detects a VDD undervoltage longer than UV_Reset_Filter_time by going to low
level. When VDD recovers to normal level Reset signal returns to high level after
Power_On_UV_Reset_Delay time (td_UV_rst). The Reset signal resets all the internal SPI
registers.
4.4
SPI
SPI is a standard four wires interface, that communicates with a data word of 24 bits. By
means of SPI all the channels can be driven in serial way and diagnosis is sent out.Timing
of SPI's operations are reported in Figure 17. The input data (DIN) is read on the rising edge
of the SPI's clock (SCLK), in the same way the output data (DOUT) must be read by the
Microcontroller on the SCLK's rising edge.
4.4.1
Data in (DIN)
DIN command is used to turn On/Off internal channels which do not have Parallel Input
command, and to clear diagnostic latches.
DIN is decoded at the end of the frame if the integrity checks are passed.



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