L9654 datasheet(55/59 Pages) STMICROELECTRONICS

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L9654

Functional description

4.14.13

SPI MISO bits layout for configuration report

Status bits <15:14> indicate the status of L9654 output channels, status bits are updated at

the falling edge of CS_S and defined by bits <15:14>. Fault codes are pushed into the FIFO

and then removed form FIFO on rising edge of CS_S and reported through MISO.

Global and channels faults are encoded in the hexadecimal range between $001 to $01F.

“Global faults” cover all satellite channels. “Channel Fault” covers only a particular channel.

Channel Fault codes are pushed once into the FIFO each time they occur while global faults

are pushed once into the FIFO even if the fault is still present. Bit 15 is set by the IC to

satisfy an odd parity for each of the transmitted word, therefore it sets to 1 if the total number

of 1’s for bits is even and to 0 if the total number of 1’s for bits is odd.

Table 44. MISO Manchester message data definition

Bit

State

Description

D15

Status bits (refer to table 44)

D14

D13

Odd Parity

D12

No FIFO Data has been lost

FIFO Data has been lost

D11:0

FIFO Contents

Table 45. Status bits definition

Bit D15

Bit D14

Definition

Current Channel is Off

Channel ON, Message processing Disabled

Channel ON, Message processing Enabled

Configuration report

Table 46. Satellites fault codes definition supporting "A" protocol

Bit D11:0 value

Fault definition

Function

No Faults (FIFO empty value)

Global Fault Codes Definition

(Reported back for CH1 only &

latched only once)

Unassigned

Bad MOSI bit Count

$3 - $F

Unassigned

$10

High-side Current Limit Exceeded

Channel Fault Codes

$11

Unassigned

$12

SPI Odd Parity Communication error

$13 - $17

Unassigned

$18

Reserved Message Received

$19

Manchester Bit Time Error

$1A

Manchester Bit Time Error or Too Few Bits

$1B

Reserved

$1C

CRC Error

$1D - $1F

Unassigned

$020 - $FFF

Manchester sensor’s data range

Manchester Data

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