L9300 datasheet(13/178 Pages) STMICROELECTRONICS

No. de pieza	L9300

Descripción Electrónicos	Automotive flexible U-chip for braking and transmission

PDF	178 Pages

Scroll/Zoom	100%

Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

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13 / 178 page

If the device receives an SPI command to refresh the keep-alive bit within the first keep-alive period the device

remains awake. Once the keep-alive bit is refreshed a new KA_period starts and so forth. To stay on the keep-

alive bit should be refreshed at each KA_period.

7.4

Power down

The power down, depending on the keep on condition that is maintaining on the device, can happen in three

different ways.

In Figure 6 the power down related to a high low transition on the WAKE pin.

In Figure 7 the power down related to the removal of power hold bit.

In Figure 8 the power down related to the not refreshing keep-alive bit from the microcontroller.

During power down all the regulators are switched off at the same time except VDD4 that is delayed by a fixed

timing, provided that ASIC battery is kept supplied. No voltage control is performed during power down; in case

the relative voltage between regulators is needed it has to be guaranteed through external components.

L9300

Power up and power down

DS12258 - Rev 5

page 13/178

L9300 Datasheet(PDF) 13 Page - STMicroelectronics