L9800 datasheet(19/55 Pages) STMICROELECTRONICS

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Figure 11. Scenario 7 power-up

tSLEEP2IDLE

VDDIO

VBATT

IDLE

POR

V3V3

V1V2

Scenario 7: power-up by VDDIO without VBATT (0 V) in sleep to idle transition. VDDIO is applied in its operative

range (3 V to 5.5 V). IDLE is set to high and the POR signal is released in tSLEEP2IDLE (about 10 μs).

Figure 12. Scenario 8 power-up

10 μs

VDDIO

VBATT

IN0

POR

V3V3

V1V2

OUT2D

Scenario 8: power-up by VDDIO without VBATT (0 V) in sleep to limp-home transition. VDDIO is applied in its

operative range (3 V to 5.5 V). IN0 (or IN1) is set to high; the POR signal is released after 10 μs but OUT2D does

not turn on.

6.1.2

Sleep mode

In sleep mode, the outputs of L9800 are OFF and the SPI registers are reset to default values. The current

consumption is reduced to the IVDDIO(SLEEP) and IVBATT(SLEEP). Refer to the parameters IVDDIO(SLEEP) and

IVBATT(SLEEP) in the Table 11. Power supply.

6.1.3

Idle mode

In idle mode, the current consumption of the device reaches the parameters IVDDIO(IDLE) and IVBATT(IDLE).The on

diagnosis functions are available only in read mode. During idle mode the output channels are disabled. The SPI

communication is properly working, when the VDDIO is present. In idle mode DIAG_OVC_OVT bits are not

clearable.

L9800

Power supply

DS14041 - Rev 2

page 19/55

L9800 Datasheet(PDF) 19 Page - STMicroelectronics