ADM1186-1ARQZ 데이터 시트보기 (PDF) - Analog Devices

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ADM1186-1ARQZ

Quad Voltage Up and Down Sequencer and Monitor with Programmable Timing

Analog Devices 

Data Sheet

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.

ADM1186

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

SEQUENCE UP

TRIGGER

SEQUENCE

SUPPLY 1 ON

SEQUENCE

SUPPLY 1 OFF

FAULT HANDLER

SEQUENCE

SUPPLY 2 ON

SEQUENCE

SUPPLY 2 OFF

FAULT CONDITION OCCURS

IN ANY STATE

SEQUENCE

SUPPLY 3 ON

SEQUENCE

SUPPLY 3 OFF

SEQUENCE

SUPPLY 4 ON

SEQUENCE

SUPPLY 4 OFF

SEQUENCE DOWN TRIGGER

POWER-UP DONE

Figure 2. Simplified State Machine Diagram

Rev. B | Page 3 of 28

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