L9662 datasheet(55/80 Pages) STMICROELECTRONICS

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L9662

Functional description

3.4.6

Satellite sensor interface

The device provides four currents limited to I_Lim each through outputs ICH1, ICH2, ICH3

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

2, 3 and 4 serve as switched power sources to remote mounted satellite sensors. The

device 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 SPI2. Both the satellite and squib circuits can be reset over

when sending the appropriate configuration commands via SPI1 (16 bit SPI).

For operation using a sync pulse a capacitor between 10 nF to 47 nF is required to be within

70 nH of the respective ASIC pin for signal stability.

In case of loss of VCC all outputs will remain off.

Satellite operation modes

Each receiver channel provides different modes of operation that can be programmed by

SPI command.

Receive mode (asynchronous data transfer)

In Receive Mode the sensor interface operates in asynchronous mode. The specified data

messages from each channel will be continuously received every tasync. (Design Information

only).

The Sensor Interface supplies satellites and receives current modulated data. In this mode,

the channels are supplied via pin VSATS. A voltage

 VICHxmin+Vhdp_max(I=75mA@105°C) at

this input pin is required to provide the regulated voltage of VICHxmin at the satellite outputs

[ICH0]...[ICH3].

Table 32. MOSI monitor mode 3 bit definition

Bit

MOSI command

MISO response

State

Description

D15

Mode Bits

See above for state

D14

See above for state

D13

Odd Parity – Includes all 16 bits

D12

See above for state

D11

Mode selection

See above for state

D10

Mode selection

See above for state

D9-D6

‘0001’ shall be device L9662

D5:D0

Revision Information:

Upper 3 bits will reflect full pass

Lower 3 bits will reflect metal/minor change

First pass device will be indicated as “001

000”

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