L9779WD datasheet(131/170 Pages) STMICROELECTRONICS

tên linh kiện	L9779WD

Giải thích chi tiết về linh kiện	Multifunction IC for engine management system

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L9779WD

Functional description

169

The commands that perform a read access to the L9779WD-data always initiate 4 registers

to be sent by the L9779 to the µC.

Within the execution of these read commands an upstream data frame is sent after the 2

stop bits of the prior upstream data frame and one additional inter-frame bit waiting time.

If a new read command is received while the 4 registers up-stream communication is active,

the 16 bit up-stream on-going is completed and after the inter-frame bit it is sent the new 4

With the beginning of the upstream frame the latched flags contained in the register are

cleared automatically.

The time from the read command to the first upstream frame of the answer is less than

100µs.

The end of the upstream frame is after 17 x 4 tUSC. Outside the upstream frame the DO

output is high impedance.

Figure 80. Upstream communication diagram

Timing characteristics

Figure 81. Timing diagram

L9779WD bảng dữ liệu(PDF) 131 Page - STMicroelectronics