ADM1166ASUZ View Datasheet(PDF) - Analog Devices

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ADM1166ASUZ

Super Sequencer with Margining Control and Nonvolatile Fault Recording

Analog Devices 

ADM1166

SEQUENCING ENGINE

OVERVIEW

The ADM1166 sequencing engine (SE) provides the user with

powerful and flexible control of sequencing. The SE implements

state machine control of the PDO outputs, with state changes

conditional on input events. SE programs can enable complex

control of boards such as power-up and power-down sequence

control, fault event handling, and interrupt generation on warnings.

A watchdog function that verifies the continued operation of a

processor clock can be integrated into the SE program. The SE

can also be controlled via the SMBus, giving software or firmware

control of the board sequencing.

The SE state machine comprises 63 state cells. Each state has the

following attributes:

• Monitors signals indicating the status of the 10 input pins,

VP1 to VP4, VH, and VX1 to VX5.

• Can be entered from any other state.

• Three exit routes move the state machine onto a next state:

sequence detection, fault monitoring, and timeout.

• Delay timers for the sequence and timeout blocks can be

programmed independently and changed with each state

change. The range of timeouts is from 0 ms to 400 ms.

• Output condition of the 10 PDO pins is defined and fixed

within a state.

• Transition from one state to the next is made in less than

20 μs, which is the time needed to download a state definition

from EEPROM to the SE.

• Can trigger a write of the black box fault and status

registers into the black box section of EEPROM.

MONITOR

FAULT

STATE

TIMEOUT

SEQUENCE

Figure 26. State Cell

The ADM1166 offers up to 63 state definitions. The signals

monitored to indicate the status of the input pins are the outputs

of the SFDs.

WARNINGS

The SE also monitors warnings. These warnings can be generated

when the ADC readings violate their limit register value or

when the secondary voltage monitors on VPx or VH are triggered.

The warnings are OR’ed together and are available as a single

warning input to each of the three blocks that enable exiting a state.

SMBus JUMP (UNCONDITIONAL JUMP)

The SE can be forced to advance to the next state unconditionally.

This enables the user to force the SE to advance. Examples of

the use of this feature include moving to a margining state or

debugging a sequence. The SMBus jump or go-to command

can be seen as another input to sequence and timeout blocks to

provide an exit from each state.

Table 7. Sample Sequence State Entries

State Sequence

IDLE1 If VX1 is low, go to State IDLE2.

IDLE2 If VP1 is okay, go to State EN3V3.

EN3V3 If VP2 is okay, go to State EN2V5.

DIS3V3 If VX1 is high, go to State IDLE1.

EN2V5 If VP3 is okay, go to State PWRGD.

DIS2V5

FSEL1

FSEL2

PWRGD

If VX1 is high, go to State IDLE1.

If VP3 is not okay, go to State DIS2V5.

If VP2 is not okay, go to State DIS3V3.

If VX1 is high, go to State DIS2V5.

Timeout

If VP2 is not okay after 10 ms,

go to State DIS3V3.

If VP3 is not okay after 20 ms,

go to State DIS2V5.

Monitor

If VP1 is not okay, go to State IDLE1.

If VP1 or VP2 is not okay, go to State FSEL2.

If VP1 or VP2 is not okay, go to State FSEL2.

If VP1 is not okay, go to State IDLE1.

If VP1, VP2, or VP3 is not okay, go to State FSEL1.

Rev. 0 | Page 17 of 32

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