L9663 datasheet(25/104 Pages) STMICROELECTRONICS

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DocID028693 Rev 1

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L9663

Satellite interface

103

Satellite interface

3.1

Receiver with digital sampling and filtering

This module has the following features:



The output current signal is mirrored and converted to the digital domain



Automatic synchronization on entire PSI5 frames



Fast DAC digital conversion of sensed currents with digital filtering



Static DC current set point tracking of PSI5 quiescent current.



Tracking of modulated PSI5 current signal

The quiescent current tracking can be configured to work in two ways (reg. ADVSET1,

ADVSET3, bits FREEZE_DIS): continuous mode tracking or tracking between consecutive

frames till the first edge of a new frame is recognized. In the second case, the quiescent

current is frozen till the end of the frame.

To recognize the PSI5 current signal level the receiver compares the digitally converted and

filtered current with a threshold. This threshold can be fixed or dynamic, depending on the

configuration selected by SPI (reg. ADVSET).

In fixed threshold mode the user must program the right delta current threshold, according

to the application requirements. The threshold is obtained as tracked quiescent current plus

the programmed threshold.

In dynamic threshold mode, the threshold is dynamically adapted considering the PSI5

current input signal.

For detailed explanation on all the possible configurations refer to ADVSET registers

section.

Depending on the selected configuration, the threshold for the sensor signal can be

permanently tracked, separately for each PSI5 interface. The IC is designed to compensate

erratic changes of the quiescent current in the bus according to PSI5 standard

requirements.

The v2.x standard low power mode is not supported with dynamic threshold mode.

Micro cuts up to 10μs do not affect the DC current tracking in a way that more than one

frame will be lost.

The PSI5 Receiver is designed to operate at:



83.3 Kbps typical (slow mode)



125 Kbps typical (standard mode)



189 Kbps typical (fast mode).

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