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L9663 Datenblatt(PDF) 16 Page - STMicroelectronics

Teilenummer L9663
Bauteilbeschribung  Automotive PSI5 Transceiver IC
PDF  106 Pages
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9663 Datenblatt(HTML) 16 Page - STMicroelectronics

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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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