L99LDLH32 datasheet(48/142 Pages) STMICROELECTRONICS

48 / 142 page

Communication interface

L99LDLH32

48/142

DS12879 Rev 6

In each 16-byte data package data for Ch15, respectively the highest channel number, is

the MSB, data for Ch0, respectively the lowest channel number, is the LSB.

This broadcast frame will be ignored by the Responder as long as its Reset Bit RSTB is not

cleared.

6.5.3

Chain initialization

A specific broadcast frame is sent to all Responders to inform them about the chain they

belong to and their position within this chain so each Responder is able to grab data

intended for it.

Figure 20. Broadcast chain initialization

The ID for this chain initialization frame is “1_0110_0000000”. For every Responder three

bytes are used to identify the chain it belongs to, its position and the addressed Responder

with the following data structure for each Responder:



MSB: 0, Chain ID [5:0], 0



Next byte: 000,Pos[1,0], 00, Responder ID[8]



LSB: Responder ID[7:0]



Position 00: Responder picks data bytes 0-15



Position 01: Responder picks data bytes 16-31



Position 10: Responder picks data bytes 32-47



Position 11: Responder picks data bytes 48-63

Note:

If a device has several Responder IDs (i.e. a 32-channel device has two Responder IDs),

those Responder IDs must be assigned to different Chain IDs

Responder IDs of the same device cannot be initialized in a single broadcast frame.

As reported in Figure 20, it is possible to initialize up to 21 Responders within one chain

initialization broadcast frame.

Chain Initialization will be executed on the Responder, even if its Reset Bit RSTB is set.

Chain Initialization will not clear Reset Bit RSTB.

6.5.4

Go to sleep/wake-up pattern

For sending the network to sleep and waking it up again a dedicated ID is defined.



The reserved WUP ID is “1_000_011_1100”. A frame with this ID and without data (DLC=0)

is the command to send all Responders into sleep/standby mode. This is shown in

Figure 21

Figure 21. Send-To-Sleep command

For waking up all the Responders, in the network the data in the payload satisfy the wake-

up pattern requirements of ISO11898-2 with tCAN_FILTER (short) at 1Mb/s.

10000000

CTRL

0, Chain ID [5:0], 0

000, Pos [1:0], 00, Responder ID [8] Responder ID [7:0]

ACK/EOF

CRC

repeated up to 21 times

...

„1_000_011_1100"

CTRL

CRC

ACK/EOF

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