L9658 datasheet(47/64 Pages) STMICROELECTRONICS

47 / 64 page

L9658

Functional description

Doc ID 14219 Rev 3

47/64

4.13.3

ARM[01..67]*

Arming-command complement. These bits are the complements of ARM[01..67] bits and

will be used to confirm the transmission of arming signals. If L9658 does not receive valid

complement bits, it will ignore the arming command.

4.13.4

Arming MISO_A bit definition

Arming MISO_A is defined in table below.

4.13.5

ARM[01..67]

Arming status. These bits are used to echo arming bits sent in the previous arming

command. A value of 1 indicates that arming signal is enabled for the respective loop-pair. A

value of 0 indicates that arming signal is disabled for the respective loop-pair.

The default state of these arming signals is ‘0’ (disabled).

4.14

Satellite sensor interface

The device provide four currents limited to 60mA each through outputs ICH1, ICH2, ICH3

and ICH4. The voltage at these four channels is supplied by the V8BUCK input. Channels 1,

2, 3 and 4 serves as switched power sources to remote mounted satellite sensors, each will

draw 2 current levels. The L9658 will monitor the current flow from its output pin and

“demodulate” the current to be decoded using Manchester protocol. Decoded satellite

message is communicated to an external microprocessor via SPI.

Figure 18.

Satellite interface block diagram

Table 31.

Arming MISO_A bit definition

7654321

ARM67

ARM45

ARM23

ARM01

ARM67

ARM45

ARM23

ARM01

MSG

Current

Sense with

STB

blocking

FET

Current

Limit

(STG

Protect)

FIFO

SPI IN

SPI OUT

Control

Configurati

CCRx/MCR

Manchester

Decode &

CRCOr

Parity Check

ICHX

V8BUCK

Satellite

Status Bits

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