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L9663 Datasheet(PDF) 16 Page - STMicroelectronics |
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L9663 Datasheet(HTML) 16 Page - STMicroelectronics |
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16 / 104 page  Overall description L9663 16/104 DocID028693 Rev 1 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 |
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