L9658 datasheet(54/64 Pages) STMICROELECTRONICS

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Functional description

L9658

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Doc ID 14219 Rev 3

Bits[11:8]

These bits are used configure the output channels for either sensor protocols. In the “B”

protocol mode a parity bit is used to verify communication between the satellite sensors and

the IC.

The L9658 calculates the parity of the incoming massage based on either odd parity or even

parity, which is determined by the setting of bit D12. In case of communication parity

mismatch a communication parity error shall be reported via SPI.

If none of the channels is configured for the “B” protocol a write operation to this bit is

ignored.

Bit [12]

This Bit controls the parity calculation for incoming sensor messages to either even or odd

parity; the selected setting apply to all channels operating in “B” protocol node.

The setting of this bit is ignored by the IC for the channels configured for “A” protocol. the

MCR register have to written at least once in order for the device to be configured correctly,

however it can be superseded with a CCR command.

4.14.14

Channel configuration registers (CCR1, CCR2, CCR3, CCR4)

This register is used to configure individual channels for proper satellite communication as

required by the application please refer to below table 33 for bits definition.

Table 35.

Channel configuration register definition

Bit

State

Description

D13

Don’t Flush FIFO (Default)

Flush FIFO

D12

Write to bits <D9-D0>, D12 and D13 only. All other CCR

D12 bits shall keep previous setting.

Write to D4, D5, D10, D11, D12 and D13 only. All other

CCR bits shall keep previous setting.

D11

Mode Select (refer to Table 40)

D10

Bit Time Selection (refer to Table 39)

"B" Protocols configuration bits (refer to Table 38) Only applies when CHx

is configured to use "B" Only applies when CHx is configured to use "B"

protocol through MCR otherwise treated as DON’TCARE

Satellite/Decoder Control (refer to Table 37)

Current Trip Point Hysteresis Disabled (default)

Current Trip Point Hysteresis Enabled

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