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ADM1186-1ARQZ Datasheet(PDF) 3 Page - Analog Devices |
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ADM1186-1ARQZ Datasheet(HTML) 3 Page - Analog Devices |
3 / 28 page ADM1186 Rev. 0 | Page 3 of 28 During a power-up sequence, the state machine enables each power supply in turn. The supply output voltage is monitored to determine whether it rises above the UV threshold level within a user defined duration called the blanking time. If a supply rises above the UV threshold, the next enable output in the sequence is turned on. In addition to the blanking time, the user can also define a sequence time delay before each enable output is turned on. The ADM1186-1 provides an open-drain pin, SEQ_DONE, that is asserted high to provide an indication that a power-up sequence is complete. The SEQ_DONE pin allows multiple cascaded ADM1186-1 devices to perform controlled power-up and power-down sequences. During a power-down sequence, the enable outputs turn off in reverse order. The same sequence time delays used during the power-up sequence are also used during the power-down sequence as each enable output is turned off; no blanking time is used during a power-down sequence. At the end of a power- down sequence, the SEQ_DONE pin is brought low. During sequencing and when powered up, the state machine continuously monitors the part for any fault conditions. Faults include a UV condition on any of the inputs or an unexpected control input. Any fault causes the state machine to enter a fault handler, which immediately turns off all enable outputs and then ensures that the device is ready to start a new power-up sequence. The ADM1186-1 has a bidirectional pin, FAULT, that facilitates fault handling when using multiple devices. If an ADM1186-1 experiences a fault condition, the FAULT pin is driven low, causing other connected ADM1186-1 devices to enter their own fault handling states. The ADM1186-1 is available in a 20-lead QSOP package, and the ADM1186-2 is available in a 16-lead QSOP package. POWER-DOWN DONE WAIT START FAULT HANDLER SEQUENCE SUPPLY 1 ON SEQUENCE SUPPLY 1 OFF SEQUENCE SUPPLY 2 ON SEQUENCE SUPPLY 2 OFF SEQUENCE SUPPLY 3 OFF SEQUENCE SUPPLY 4 OFF SEQUENCE SUPPLY 3 ON SEQUENCE SUPPLY 4 ON POWER-UP DONE SEQUENCE UP TRIGGER SEQUENCE DOWN TRIGGER FAULT CONDITION OCCURS IN ANY STATE Figure 2. Simplified State Machine Diagram |
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