L9658 datasheet(60/64 Pages) STMICROELECTRONICS

60 / 64 page

Functional description

L9658

60/64

Doc ID 14219 Rev 3

As mentioned earlier the L9658 supports a "B" Manchester data protocol, the data field for

this protocol can be configured to any number of bits between 8 to 11 bits. Incoming data

from the sensor using a "B" protocol shall be right justified by the IC. For example if the

incoming message has only 8bits in the data filed. The device will transmit this message on

MISO such that it occupies bits <7:0> bits 8,9 and 10 are set to 000.

Unlike DELPHI protocol, LSB will be the first bit on MISO.

Too Many Bits and Too Few Bits faults can be calculated based on the number of bits in the

data field. So if we consider the 8 bit "B" protocol example discussed above a message with

9 bits in the data field should set the too many bits fault flag, on the other hand a message

with 7 bits in the data field should set the too few bits fault flag.

When the L9658 is configured to use a the Manchester "B" protocol, the device set SPI

MOSI D11 to 0 when reporting fault data and to 1 when reporting satellite data. This

operation should allow both sensors "A" based or Generic based to use the same fault

codes.

Table 47.

Satellites fault codes definition supporting “B” 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

Unassigned

$19

Manchester Bit Time Error OR

Too Few Bits

$1A

Too Many Bits

$1B

Reserved

$1C

Satellite Communication Parity error

$800 - $FFF

Manchester sensor’s data range D11 shall be

set to 1 by the IC when receiving sensor data.

When reporting faults D11 shall be set

internally by the IC to 0

Manchester data

Table 48.

Hall effect fault codes definition (CH3 and CH4) only

Bit D11:0 value

Fault definition

Function

No Faults (FIFO empty value)

No Faults

$1 - $F

Unassigned

Fault Codes

$010

High Side Current Limit Exceeded

$12

SPI Odd Parity Communication error

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