L9779WD datasheet(131/170 Pages) STMICROELECTRONICS

номер детали	L9779WD

подробное описание детали	Multifunction IC for engine management system

PDF	170 Pages

Scroll/Zoom	100%

производитель	STMICROELECTRONICS [STMicroelectronics]

домашняя страница	http://www.st.com

Logo

131 / 170 page

DocID027452 Rev 5

131/170

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 датащи(PDF) 131 Page - STMicroelectronics