STLED325 datasheet(15/62 Pages) STMICROELECTRONICS

部件名	STLED325

功能描述	Standby power management to host

PDF	62 Pages

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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15 / 62 page

STLED325

Functional description

Doc ID 17576 Rev 1

15/62

3.10.1

Cold boot up

When power is first applied to the system, the STLED325 is reset. It will then manage the

power to the main board by bringing the STBY pin to a low level.

This wakes up the main processor which asserts the READY pin to a high level to indicate to

STLED325 of a proper boot-up sequence.

If the microprocessor does not assert the READY pin to a high within 10s (default), the

STLED325 cuts off the power to the Host by asserting the STBY pin. The high level on

READY pin signifies that the processor is ready. After this, the processor can configure the

STLED325 by sending the various I2C commands for configuration of display, RC protocol,

RTC display mapping, hot-keys.

The power-up behavior in 2 conditions is shown in Figure 5.

STLED325 数据表(PDF) 15 Page - STMicroelectronics