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STLED325 Datasheet(PDF) 15 Page - STMicroelectronics |
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STLED325 Datasheet(HTML) 15 Page - STMicroelectronics |
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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. |
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