LDLL16ENTR datasheet(38/102 Pages) STMICROELECTRONICS

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If the frame does not contain any data, it serves as “Go-To-Sleep”-command for all responders in the network. If it

contains at least one data byte, it acts as a wake-up pattern for all responders.

Table 10. Wake up pattern (WUP) frame

CTRL

DLC

DATA BYTE 1

DATA BYTE 2-8

"1_000_011_1100"

"001000"

1000

1111_1110

0000_1111

In conclusion:

ID = "1_000_011_1100" and DLC = 0 → send-to-sleep command

ID = "1_000_011_1100" and DLC ≠ 0 → wake-up pattern frame

5.6.5

Synchronization frame

The synchronization frame must be sent by the commander after each responder reply, but only if the addressed

devices change in the next commander frame.

Due to the frequency offset between the responding responder and the commander, some other responders may

not be able to receive frames sent by the commander correctly after a responder reply. Therefore, the frame in the

Figure 27 has to be sent by the commander to ensure the correct synchronization of all responders to the

commander. The responders synchronize on this frame but drop the content because it does not contain an ID

that the responders recognize.

Figure 27. Synchronization frame

"1_010_101_0101"

CTRL

CRC

ACK/EOF

Table 11. Synchronization frame

CTRL

DLC

"1_010_101_0101"

"001000"

0000

LDLL16EN

Communication interface

DS14111 - Rev 5

page 38/102

LDLL16ENTR Datasheet(PDF) 38 Page - STMicroelectronics