L9300 datasheet(13/182 Pages) STMICROELECTRONICS

13 / 182 page

Figure 5. Wake up through WAKE pin

VBATP

WAKE

Tmask

VDD ST EN

OFF

Ton

RES2

RES1

TRK4

TRK3,

TRK2,

TRK1,

VDD2

VDD4

VDD3

VDD1

WK_FLT_up

VDD3_dly

VDD2_SEL

TRK_SEL

RES1

St-by

GADG0707170959PS

7.3

Keep on

The device provides three different possibilities to stay ON.

A persistent high signal on WAKE pin

The setting of the power hold bit through SPI

The refreshing of the keep alive SPI bit within a certain time frame.

At each high to low transition on the WAKE pin the device enters the keep-alive mode for one keep-alive period

(KA_period).

If the device receives an SPI command to set the power hold bit within the first keep-alive period, the device

remains awake.

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; after each refresh of the keep alive counter, the keep alive

bit is automatically reset.

Otherwise after the KA_period the device exits the keep-alive mode and enters in power down, unless the WAKE

pin remains high.

At each power up by CAN the device enters the keep-alive mode for one keep-alive period (KA_period).

If the device receives an SPI command to set the power hold bit within the first keep-alive period the device

remains awake.

L9300

Keep on

DS12258 - Rev 4

page 13/182

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