L9663 datasheet(16/106 Pages) STMICROELECTRONICS

16 / 106 page

Overall description

L9663

16/106

DS11401 Rev 6

1.7

Power up sequence

When VDD is higher than the startup threshold and VB is available the IC is switched on.

To reduce disturbances on its voltage supply, the transceiver IC does a staggered startup of

its internal voltage supplies.

While RESETN is low, the PSIx lines are deactivated to reduce power consumption and to

increase system safety.

The transceiver IC can be configured to operate in the standard current mode (4 mA up to

19 mA) or in the extended current mode (4 mA up to 35 mA). Moreover, both channels can

be configured to allow the extension to a maximum quiescent current of 45 mA, only in case

of asynchronous mode.

The synchronous sensors send data only after a synchronous pulse is triggered via the

dedicated pin or by SPI.

The following figure shows a power-up example.

Figure 6. Power-up sequence of transceiver IC

VB, VASSUP

VDD

VDDwu

VINTA

RESETN

IC enable

Charge pump off = VB

VASton = 1 ms

VINTD

typ 100 μs

t < 250 μs in no

fault conditions

POR

Charge pump

Start charging CB1

Start charging CB2

tch_reset2 = 2 ms

VAS

GAPG2710150900PS

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