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STLED325 数据表(PDF) 16 Page - STMicroelectronics |
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STLED325 数据表(HTML) 16 Page - STMicroelectronics |
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16 / 62 page  Functional description STLED325 16/62 Doc ID 17576 Rev 1 Figure 5. Power-up condition Note: 1 Guard timer is turned off by default upon READY assertion. 2 If Guard timer is to be kept on during READY high condition, the guard timer registers must be set accordingly by proper commands through I2C bus. 3 In this power-up condition, Guard timer is triggered by internal POR pulse. 4 During power-up, the Guard timer value is 10s. VCC to STLED325I Internal POR STBY READY MUTE Guard timer counts up to 10s 1a) Power-up condition (normal behavior ) VCC to STLED325I Internal POR STBY READY MUTE Guard timer counts up to 10s 1b) Power-up condition (processor not responding ) Count over Due to abnormality in the processor, READY did not change state from low to high, leading to STBY assertion READY asserts within 10s which is the desired behavior, processor is active and not hung READY continues to remain low/high |
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