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ADP5589ACBZ-02-R7 Datasheet(PDF) 13 Page - Analog Devices |
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ADP5589ACBZ-02-R7 Datasheet(HTML) 13 Page - Analog Devices |
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13 / 52 page  Data Sheet ADP5589 Rev. B | Page 13 of 52 When full unlock is achieved, FIFO and event count updates resume. Note that if a key press is used as the second unlock event, the release of that key is captured on the FIFO after unlocking is completed. The ADP5589 features an unlock timer, UNLOCK_TIMER[2:0] (0x36[2:0]). When enabled, after the first unlock event occurs, the unlock timer begins counting, and the second unlock event must occur before the unlock timer expires. If the unlock timer expires, the first unlock event must occur again to restart the unlock process. Figure 15 shows a simple state diagram of the unlocking process. NO FIRST UNLOCK EVENT? UNLOCK TIMER ENABLED? SECOND UNLOCK EVENT REQUIRED? START UNLOCK TIMER UNLOCK TIMER EXPIRED? UNLOCK YES NO YES SECOND UNLOCK EVENT? NO YES YES LOCKED NO NO YES YES LOCK_STAT = 0 LOCK_STAT = 1 LOCK_STAT = 1 EVENT DETECTED? YES NO EVENT DETECTED? YES NO EVENT DETECTED? NO Figure 15. State Diagram of Unlocking Process When lock mode is enabled, no EVENT_INT interrupts can be generated until the unlock events occur. The ADP5589 features an interrupt mask timer, INT_MASK_ TIMER[4:0] (0x36[7:3]). When this timer and lock mode are enabled, a single EVENT_INT is generated if any key is pressed or any GPI (programmed to update the FIFO) is active. When the EVENT_INT is generated, the mask timer begins counting. No additional EVENT_INT interrupts are generated until the mask timer expires and a new key is pressed or any GPI (programmed to update the FIFO) is active, unless the unlock events occur, in which case, normal operation is resumed. Allowing a single EVENT_INT interrupt is useful to alert the processor to turn on its screen and display an unlock message to the user. Blanking out additional key presses ensures that the processor is not unnecessarily interrupted until the unlock events occur. Figure 16 shows the unlock sequence when the interrupt mask timer is enabled. |
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