LDLL16ENTR datasheet(35/102 Pages) STMICROELECTRONICS

35 / 102 page

In case of "Unicast communication" (see the Section 5.7: Unicast frames), a commander can access all device

registers using a CAN ID equal to a responder ID0, while the ID of the responder answer is always equal to

(responder ID0 | 0x200). A specific protocol is embedded into the data of the unicast frames to specify register

address and type of operation (read/write/clear). In case of "Broadcast communication" (see the

Section 5.6: Broadcast frames), a commander can send a CAN FD frame with 64 data bytes to several

responders. Each broadcast data frame has a specific chain ID (bits 0-5 of CAN ID field, see the

Section 5.6.3: Chain initialization) which allows to distinguish between 64 different groups of responders.

Each responder assigned to this chain ID group can pick 16 data bytes from this frame (data position is

configurable) and update all duty cycle or current values registers accordingly. The selection between duty cycle

or current value update is done by bit 6 of CAN ID field. The Chain ID and data position of each responder is

configurable using broadcast initialization frame.

LDLL16EN

Communication interface

DS14111 - Rev 5

page 35/102

LDLL16ENTR Datasheet(PDF) 35 Page - STMicroelectronics