L9663 datasheet(15/106 Pages) STMICROELECTRONICS

15 / 106 page

DS11401 Rev 6

15/106

L9663

Overall description

105

The high supply voltage of the IC can be a battery or a regulated voltage provided by the

ECU.

To reduce disturbances on the voltage supply which might have a negative influence on the

PSIx interface and therefore lead to bit errors, a PI filter can be employed in the supply line.

Possible power supply configurations(b) are:



VB, VASSUP connected to VSUP, VAS and VSYNCx generated by the IC with external

components (as in the above figure);



VAS, VB, VASSUP connected to VSUP, VSYNCx generated by bootstrap, no external

MOS, VGS pin open;



VB, VASSUP, BH1, BH2 connected to VSUP, no external capacitors CBx, VAS

generated by IC pre-regulator and external MOS;



VB connected to VSUP, VASSUP connected to 0V (charge pump off), VAS supplied by

an external source and VSYNCx generated by the IC with external components.

The values of the external components RE2_x, CE_x and CL_x are specified in PSI5

standard.

The assumed line model for the PSI5 interface on which the transceiver IC operates is as

follows:

Figure 5. Supply line model for PSI5

b. The high supply voltage VSUP must be in the correct operative range of connected pins.

GAPGPS01665

L9663 Datasheet(PDF) 15 Page - STMicroelectronics