L9663 datasheet(34/106 Pages) STMICROELECTRONICS

34 / 106 page

Satellite interface

L9663

34/106

DS11401 Rev 6

Basic features:



Registers for initialization data (up to 8 init data buffer by 16 word available)



Automatic detection of init data



Reading via SPI

Figure 19. Timing diagram

After the activation of an interface, the transceiver IC can check for incoming sensor

initialization data on that interface and store the data for further processing. This behavior is

triggered by the configuration bit READ_INIT_DATA on that channel.

If the bit is set, an internal FSM checks for IDn and data blocks Dn in the incoming payload

data on that interface and stores data in the init buffer id (init_buf_id) of the corresponding

frame id at address n-1 in the following format:

The frame control bits allow using up to 8 init data buffers when automatic storage of init

data is activated and both interfaces are used (READ_INIT_DATA1 = READ_INIT_DATA2 =

1). In case only one interface is active, the IC can store up to 6 init data on that interface.

As specified in PSI5, data nibbles D2 and D3 contain the number of datablock expected for

the all init procedure for each particular frame id; when all the init data are received for the

engaged sensors (i.e. for the sensors which had sent at least one correct data blocks) on

both the interfaces, the init_data_rdy is set and the µC can read all the init data by SPI.

During reset, the incoming data buffer is cleared and the counters for each initialization data

block are set to "00".

RegAddr

15 (MSB)

0 (LSB)

n-1

additional data from blockid

message (6 bits --- 0 bits)

data block ( 4 bits )

additional data from data

message (6 bits --- 0 bits)

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